PulltorefreshRecycleview拓展（pulltorefresh库）

因为项目中引用了pulltorefresh的库。这个库的历史有点久远。。。12年的库。。。献上它的库https://github.com/chrisbanes/Android-PullToRefresh。这里比较蛋疼的是不支持recycleview了。。。so,github一把，搜到了这个改进的拓展库。https://github.com/chrisbanes/Android-PullToRefresh主要讲的是拓展部分。

一、PullToRefreshBase.java部分代码变动（添加mRefreshableView，改为protected可以外部调用）直接copy替换吧

/******************************************************************************* * Copyright 2011, 2012 Chris Banes. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *******************************************************************************/package com.handmark.pulltorefresh.library;import android.content.Context;import android.content.res.TypedArray;import android.graphics.drawable.Drawable;import android.os.Build.VERSION;import android.os.Build.VERSION_CODES;import android.os.Bundle;import android.os.Parcelable;import android.util.AttributeSet;import android.util.Log;import android.view.Gravity;import android.view.MotionEvent;import android.view.View;import android.view.ViewConfiguration;import android.view.ViewGroup;import android.view.animation.DecelerateInterpolator;import android.view.animation.Interpolator;import android.widget.FrameLayout;import android.widget.LinearLayout;import com.handmark.pulltorefresh.library.internal.FlipLoadingLayout;import com.handmark.pulltorefresh.library.internal.LoadingLayout;import com.handmark.pulltorefresh.library.internal.RotateLoadingLayout;import com.handmark.pulltorefresh.library.internal.Utils;import com.handmark.pulltorefresh.library.internal.ViewCompat;public abstract class PullToRefreshBase<T extends View> extends LinearLayout implements IPullToRefresh<T> {    // ===========================================================    // Constants    // ===========================================================    static final boolean DEBUG = true;    static final boolean USE_HW_LAYERS = false;    static final String LOG_TAG = "PullToRefresh";    static final float FRICTION = 2.0f;    public static final int SMOOTH_SCROLL_DURATION_MS = 200;    public static final int SMOOTH_SCROLL_LONG_DURATION_MS = 325;    static final int DEMO_SCROLL_INTERVAL = 225;    static final String STATE_STATE = "ptr_state";    static final String STATE_MODE = "ptr_mode";    static final String STATE_CURRENT_MODE = "ptr_current_mode";    static final String STATE_SCROLLING_REFRESHING_ENABLED = "ptr_disable_scrolling";    static final String STATE_SHOW_REFRESHING_VIEW = "ptr_show_refreshing_view";    static final String STATE_SUPER = "ptr_super";    // ===========================================================    // Fields    // ===========================================================    private int mTouchSlop;    private float mLastMotionX, mLastMotionY;    private float mInitialMotionX, mInitialMotionY;    private boolean mIsBeingDragged = false;    private State mState = State.RESET;    private Mode mMode = Mode.getDefault();    private Mode mCurrentMode;    protected T mRefreshableView;    private FrameLayout mRefreshableViewWrapper;    private boolean mShowViewWhileRefreshing = true;    private boolean mScrollingWhileRefreshingEnabled = false;    private boolean mFilterTouchEvents = true;    private boolean mOverScrollEnabled = true;    private boolean mLayoutVisibilityChangesEnabled = true;    private Interpolator mScrollAnimationInterpolator;    private AnimationStyle mLoadingAnimationStyle = AnimationStyle.getDefault();    private LoadingLayout mHeaderLayout;    private LoadingLayout mFooterLayout;    private OnRefreshListener<T> mOnRefreshListener;    private OnRefreshListener2<T> mOnRefreshListener2;    private OnPullEventListener<T> mOnPullEventListener;    private SmoothScrollRunnable mCurrentSmoothScrollRunnable;    // ===========================================================    // Constructors    // ===========================================================    public PullToRefreshBase(Context context) {        super(context);        init(context, null);    }    public PullToRefreshBase(Context context, AttributeSet attrs) {        super(context, attrs);        init(context, attrs);    }    public PullToRefreshBase(Context context, Mode mode) {        super(context);        mMode = mode;        init(context, null);    }    public PullToRefreshBase(Context context, Mode mode, AnimationStyle animStyle) {        super(context);        mMode = mode;        mLoadingAnimationStyle = animStyle;        init(context, null);    }    @Override    public void addView(View child, int index, ViewGroup.LayoutParams params) {        if (DEBUG) {            Log.d(LOG_TAG, "addView: " + child.getClass().getSimpleName());        }        final T refreshableView = getRefreshableView();        if (refreshableView instanceof ViewGroup) {            ((ViewGroup) refreshableView).addView(child, index, params);        } else {            throw new UnsupportedOperationException("Refreshable View is not a ViewGroup so can't addView");        }    }    @Override    public final boolean demo() {        if (mMode.showHeaderLoadingLayout() && isReadyForPullStart()) {            smoothScrollToAndBack(-getHeaderSize() * 2);            return true;        } else if (mMode.showFooterLoadingLayout() && isReadyForPullEnd()) {            smoothScrollToAndBack(getFooterSize() * 2);            return true;        }        return false;    }    @Override    public final Mode getCurrentMode() {        return mCurrentMode;    }    @Override    public final boolean getFilterTouchEvents() {        return mFilterTouchEvents;    }    @Override    public final ILoadingLayout getLoadingLayoutProxy() {        return getLoadingLayoutProxy(true, true);    }    @Override    public final ILoadingLayout getLoadingLayoutProxy(boolean includeStart, boolean includeEnd) {        return createLoadingLayoutProxy(includeStart, includeEnd);    }    @Override    public final Mode getMode() {        return mMode;    }    @Override    public final T getRefreshableView() {        return mRefreshableView;    }    @Override    public final boolean getShowViewWhileRefreshing() {        return mShowViewWhileRefreshing;    }    @Override    public final State getState() {        return mState;    }    /**     * @deprecated See {@link #isScrollingWhileRefreshingEnabled()}.     */    public final boolean isDisableScrollingWhileRefreshing() {        return !isScrollingWhileRefreshingEnabled();    }    @Override    public final boolean isPullToRefreshEnabled() {        return mMode.permitsPullToRefresh();    }    @Override    public final boolean isPullToRefreshOverScrollEnabled() {        return VERSION.SDK_INT >= VERSION_CODES.GINGERBREAD && mOverScrollEnabled                && OverscrollHelper.isAndroidOverScrollEnabled(mRefreshableView);    }    @Override    public final boolean isRefreshing() {        return mState == State.REFRESHING || mState == State.MANUAL_REFRESHING;    }    @Override    public final boolean isScrollingWhileRefreshingEnabled() {        return mScrollingWhileRefreshingEnabled;    }    @Override    public final boolean onInterceptTouchEvent(MotionEvent event) {        if (!isPullToRefreshEnabled()) {            return false;        }        final int action = event.getAction();        if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {            mIsBeingDragged = false;            return false;        }        if (action != MotionEvent.ACTION_DOWN && mIsBeingDragged) {            return true;        }        switch (action) {            case MotionEvent.ACTION_MOVE: {                // If we're refreshing, and the flag is set. Eat all MOVE events                if (!mScrollingWhileRefreshingEnabled && isRefreshing()) {                    return true;                }                if (isReadyForPull()) {                    final float y = event.getY(), x = event.getX();                    final float diff, oppositeDiff, absDiff;                    // We need to use the correct values, based on scroll                    // direction                    switch (getPullToRefreshScrollDirection()) {                        case HORIZONTAL:                            diff = x - mLastMotionX;                            oppositeDiff = y - mLastMotionY;                            break;                        case VERTICAL:                        default:                            diff = y - mLastMotionY;                            oppositeDiff = x - mLastMotionX;                            break;                    }                    absDiff = Math.abs(diff);                    if (absDiff > mTouchSlop && (!mFilterTouchEvents || absDiff > Math.abs(oppositeDiff))) {                        if (mMode.showHeaderLoadingLayout() && diff >= 1f && isReadyForPullStart()) {                            mLastMotionY = y;                            mLastMotionX = x;                            mIsBeingDragged = true;                            if (mMode == Mode.BOTH) {                                mCurrentMode = Mode.PULL_FROM_START;                            }                        } else if (mMode.showFooterLoadingLayout() && diff <= -1f && isReadyForPullEnd()) {                            mLastMotionY = y;                            mLastMotionX = x;                            mIsBeingDragged = true;                            if (mMode == Mode.BOTH) {                                mCurrentMode = Mode.PULL_FROM_END;                            }                        }                    }                }                break;            }            case MotionEvent.ACTION_DOWN: {                if (isReadyForPull()) {                    mLastMotionY = mInitialMotionY = event.getY();                    mLastMotionX = mInitialMotionX = event.getX();                    mIsBeingDragged = false;                }                break;            }        }        return mIsBeingDragged;    }    @Override    public final void onRefreshComplete() {        if (isRefreshing()) {            setState(State.RESET);        }    }    @Override    public final boolean onTouchEvent(MotionEvent event) {        if (!isPullToRefreshEnabled()) {            return false;        }        // If we're refreshing, and the flag is set. Eat the event        if (!mScrollingWhileRefreshingEnabled && isRefreshing()) {            return true;        }        if (event.getAction() == MotionEvent.ACTION_DOWN && event.getEdgeFlags() != 0) {            return false;        }        switch (event.getAction()) {            case MotionEvent.ACTION_MOVE: {                if (mIsBeingDragged) {                    mLastMotionY = event.getY();                    mLastMotionX = event.getX();                    pullEvent();                    return true;                }                break;            }            case MotionEvent.ACTION_DOWN: {                if (isReadyForPull()) {                    mLastMotionY = mInitialMotionY = event.getY();                    mLastMotionX = mInitialMotionX = event.getX();                    return true;                }                break;            }            case MotionEvent.ACTION_CANCEL:            case MotionEvent.ACTION_UP: {                if (mIsBeingDragged) {                    mIsBeingDragged = false;                    if (mState == State.RELEASE_TO_REFRESH                            && (null != mOnRefreshListener || null != mOnRefreshListener2)) {                        setState(State.REFRESHING, true);                        return true;                    }                    // If we're already refreshing, just scroll back to the top                    if (isRefreshing()) {                        smoothScrollTo(0);                        return true;                    }                    // If we haven't returned by here, then we're not in a state                    // to pull, so just reset                    setState(State.RESET);                    return true;                }                break;            }        }        return false;    }    public final void setScrollingWhileRefreshingEnabled(boolean allowScrollingWhileRefreshing) {        mScrollingWhileRefreshingEnabled = allowScrollingWhileRefreshing;    }    /**     * @deprecated See {@link #setScrollingWhileRefreshingEnabled(boolean)}     */    public void setDisableScrollingWhileRefreshing(boolean disableScrollingWhileRefreshing) {        setScrollingWhileRefreshingEnabled(!disableScrollingWhileRefreshing);    }    @Override    public final void setFilterTouchEvents(boolean filterEvents) {        mFilterTouchEvents = filterEvents;    }    /**     * @deprecated You should now call this method on the result of     *             {@link #getLoadingLayoutProxy()}.     */    public void setLastUpdatedLabel(CharSequence label) {        getLoadingLayoutProxy().setLastUpdatedLabel(label);    }    /**     * @deprecated You should now call this method on the result of     *             {@link #getLoadingLayoutProxy()}.     */    public void setLoadingDrawable(Drawable drawable) {        getLoadingLayoutProxy().setLoadingDrawable(drawable);    }    /**     * @deprecated You should now call this method on the result of     *             {@link #getLoadingLayoutProxy(boolean, boolean)}.     */    public void setLoadingDrawable(Drawable drawable, Mode mode) {        getLoadingLayoutProxy(mode.showHeaderLoadingLayout(), mode.showFooterLoadingLayout()).setLoadingDrawable(                drawable);    }    @Override    public void setLongClickable(boolean longClickable) {        getRefreshableView().setLongClickable(longClickable);    }    @Override    public final void setMode(Mode mode) {        if (mode != mMode) {            if (DEBUG) {                Log.d(LOG_TAG, "Setting mode to: " + mode);            }            mMode = mode;            updateUIForMode();        }    }    public void setOnPullEventListener(OnPullEventListener<T> listener) {        mOnPullEventListener = listener;    }    @Override    public final void setOnRefreshListener(OnRefreshListener<T> listener) {        mOnRefreshListener = listener;        mOnRefreshListener2 = null;    }    @Override    public final void setOnRefreshListener(OnRefreshListener2<T> listener) {        mOnRefreshListener2 = listener;        mOnRefreshListener = null;    }    /**     * @deprecated You should now call this method on the result of     *             {@link #getLoadingLayoutProxy()}.     */    public void setPullLabel(CharSequence pullLabel) {        getLoadingLayoutProxy().setPullLabel(pullLabel);    }    /**     * @deprecated You should now call this method on the result of     *             {@link #getLoadingLayoutProxy(boolean, boolean)}.     */    public void setPullLabel(CharSequence pullLabel, Mode mode) {        getLoadingLayoutProxy(mode.showHeaderLoadingLayout(), mode.showFooterLoadingLayout()).setPullLabel(pullLabel);    }    /**     * @param enable Whether Pull-To-Refresh should be used     * @deprecated This simple calls setMode with an appropriate mode based on     *             the passed value.     */    public final void setPullToRefreshEnabled(boolean enable) {        setMode(enable ? Mode.getDefault() : Mode.DISABLED);    }    @Override    public final void setPullToRefreshOverScrollEnabled(boolean enabled) {        mOverScrollEnabled = enabled;    }    @Override    public final void setRefreshing() {        setRefreshing(true);    }    @Override    public final void setRefreshing(boolean doScroll) {        if (!isRefreshing()) {            setState(State.MANUAL_REFRESHING, doScroll);        }    }    /**     * @deprecated You should now call this method on the result of     *             {@link #getLoadingLayoutProxy()}.     */    public void setRefreshingLabel(CharSequence refreshingLabel) {        getLoadingLayoutProxy().setRefreshingLabel(refreshingLabel);    }    /**     * @deprecated You should now call this method on the result of     *             {@link #getLoadingLayoutProxy(boolean, boolean)}.     */    public void setRefreshingLabel(CharSequence refreshingLabel, Mode mode) {        getLoadingLayoutProxy(mode.showHeaderLoadingLayout(), mode.showFooterLoadingLayout()).setRefreshingLabel(                refreshingLabel);    }    /**     * @deprecated You should now call this method on the result of     *             {@link #getLoadingLayoutProxy()}.     */    public void setReleaseLabel(CharSequence releaseLabel) {        setReleaseLabel(releaseLabel, Mode.BOTH);    }    /**     * @deprecated You should now call this method on the result of     *             {@link #getLoadingLayoutProxy(boolean, boolean)}.     */    public void setReleaseLabel(CharSequence releaseLabel, Mode mode) {        getLoadingLayoutProxy(mode.showHeaderLoadingLayout(), mode.showFooterLoadingLayout()).setReleaseLabel(                releaseLabel);    }    public void setScrollAnimationInterpolator(Interpolator interpolator) {        mScrollAnimationInterpolator = interpolator;    }    @Override    public final void setShowViewWhileRefreshing(boolean showView) {        mShowViewWhileRefreshing = showView;    }    /**     * @return Either {@link Orientation#VERTICAL} or     *         {@link Orientation#HORIZONTAL} depending on the scroll direction.     */    public abstract Orientation getPullToRefreshScrollDirection();    final void setState(State state, final boolean... params) {        mState = state;        if (DEBUG) {            Log.d(LOG_TAG, "State: " + mState.name());        }        switch (mState) {            case RESET:                onReset();                break;            case PULL_TO_REFRESH:                onPullToRefresh();                break;            case RELEASE_TO_REFRESH:                onReleaseToRefresh();                break;            case REFRESHING:            case MANUAL_REFRESHING:                onRefreshing(params[0]);                break;            case OVERSCROLLING:                // NO-OP                break;        }        // Call OnPullEventListener        if (null != mOnPullEventListener) {            mOnPullEventListener.onPullEvent(this, mState, mCurrentMode);        }    }    /**     * Used internally for adding view. Need because we override addView to     * pass-through to the Refreshable View     */    protected final void addViewInternal(View child, int index, ViewGroup.LayoutParams params) {        super.addView(child, index, params);    }    /**     * Used internally for adding view. Need because we override addView to     * pass-through to the Refreshable View     */    protected final void addViewInternal(View child, ViewGroup.LayoutParams params) {        super.addView(child, -1, params);    }    protected LoadingLayout createLoadingLayout(Context context, Mode mode, TypedArray attrs) {        LoadingLayout layout = mLoadingAnimationStyle.createLoadingLayout(context, mode,                getPullToRefreshScrollDirection(), attrs);        layout.setVisibility(View.INVISIBLE);        return layout;    }    /**     * Used internally for {@link #getLoadingLayoutProxy(boolean, boolean)}.     * Allows derivative classes to include any extra LoadingLayouts.     */    protected LoadingLayoutProxy createLoadingLayoutProxy(final boolean includeStart, final boolean includeEnd) {        LoadingLayoutProxy proxy = new LoadingLayoutProxy();        if (includeStart && mMode.showHeaderLoadingLayout()) {            proxy.addLayout(mHeaderLayout);        }        if (includeEnd && mMode.showFooterLoadingLayout()) {            proxy.addLayout(mFooterLayout);        }        return proxy;    }    /**     * This is implemented by derived classes to return the created View. If you     * need to use a custom View (such as a custom ListView), override this     * method and return an instance of your custom class.     * <p/>     * Be sure to set the ID of the view in this method, especially if you're     * using a ListActivity or ListFragment.     *     * @param context Context to create view with     * @param attrs AttributeSet from wrapped class. Means that anything you     *            include in the XML layout declaration will be routed to the     *            created View     * @return New instance of the Refreshable View     */    protected abstract T createRefreshableView(Context context, AttributeSet attrs);    protected final void disableLoadingLayoutVisibilityChanges() {        mLayoutVisibilityChangesEnabled = false;    }    protected final LoadingLayout getFooterLayout() {        return mFooterLayout;    }    protected final int getFooterSize() {        return mFooterLayout.getContentSize();    }    protected final LoadingLayout getHeaderLayout() {        return mHeaderLayout;    }    protected final int getHeaderSize() {        return mHeaderLayout.getContentSize();    }    protected int getPullToRefreshScrollDuration() {        return SMOOTH_SCROLL_DURATION_MS;    }    protected int getPullToRefreshScrollDurationLonger() {        return SMOOTH_SCROLL_LONG_DURATION_MS;    }    protected FrameLayout getRefreshableViewWrapper() {        return mRefreshableViewWrapper;    }    /**     * Allows Derivative classes to handle the XML Attrs without creating a     * TypedArray themsevles     *     * @param a - TypedArray of PullToRefresh Attributes     */    protected void handleStyledAttributes(TypedArray a) {    }    /**     * Implemented by derived class to return whether the View is in a state     * where the user can Pull to Refresh by scrolling from the end.     *     * @return true if the View is currently in the correct state (for example,     *         bottom of a ListView)     */    protected abstract boolean isReadyForPullEnd();    /**     * Implemented by derived class to return whether the View is in a state     * where the user can Pull to Refresh by scrolling from the start.     *     * @return true if the View is currently the correct state (for example, top     *         of a ListView)     */    protected abstract boolean isReadyForPullStart();    /**     * Called by {@link #onRestoreInstanceState(Parcelable)} so that derivative     * classes can handle their saved instance state.     *     * @param savedInstanceState - Bundle which contains saved instance state.     */    protected void onPtrRestoreInstanceState(Bundle savedInstanceState) {    }    /**     * Called by {@link #onSaveInstanceState()} so that derivative classes can     * save their instance state.     *     * @param saveState - Bundle to be updated with saved state.     */    protected void onPtrSaveInstanceState(Bundle saveState) {    }    /**     * Called when the UI has been to be updated to be in the     * {@link State#PULL_TO_REFRESH} state.     */    protected void onPullToRefresh() {        switch (mCurrentMode) {            case PULL_FROM_END:                mFooterLayout.pullToRefresh();                break;            case PULL_FROM_START:                mHeaderLayout.pullToRefresh();                break;            default:                // NO-OP                break;        }    }    /**     * Called when the UI has been to be updated to be in the     * {@link State#REFRESHING} or {@link State#MANUAL_REFRESHING} state.     *     * @param doScroll - Whether the UI should scroll for this event.     */    protected void onRefreshing(final boolean doScroll) {        if (mMode.showHeaderLoadingLayout()) {            mHeaderLayout.refreshing();        }        if (mMode.showFooterLoadingLayout()) {            mFooterLayout.refreshing();        }        if (doScroll) {            if (mShowViewWhileRefreshing) {                // Call Refresh Listener when the Scroll has finished                OnSmoothScrollFinishedListener listener = new OnSmoothScrollFinishedListener() {                    @Override                    public void onSmoothScrollFinished() {                        callRefreshListener();                    }                };                switch (mCurrentMode) {                    case MANUAL_REFRESH_ONLY:                    case PULL_FROM_END:                        smoothScrollTo(getFooterSize(), listener);                        break;                    default:                    case PULL_FROM_START:                        smoothScrollTo(-getHeaderSize(), listener);                        break;                }            } else {                smoothScrollTo(0);            }        } else {            // We're not scrolling, so just call Refresh Listener now            callRefreshListener();        }    }    /**     * Called when the UI has been to be updated to be in the     * {@link State#RELEASE_TO_REFRESH} state.     */    protected void onReleaseToRefresh() {        switch (mCurrentMode) {            case PULL_FROM_END:                mFooterLayout.releaseToRefresh();                break;            case PULL_FROM_START:                mHeaderLayout.releaseToRefresh();                break;            default:                // NO-OP                break;        }    }    /**     * Called when the UI has been to be updated to be in the     * {@link State#RESET} state.     */    protected void onReset() {        mIsBeingDragged = false;        mLayoutVisibilityChangesEnabled = true;        // Always reset both layouts, just in case...        mHeaderLayout.reset();        mFooterLayout.reset();        smoothScrollTo(0);    }    @Override    protected final void onRestoreInstanceState(Parcelable state) {        if (state instanceof Bundle) {            Bundle bundle = (Bundle) state;            setMode(Mode.mapIntToValue(bundle.getInt(STATE_MODE, 0)));            mCurrentMode = Mode.mapIntToValue(bundle.getInt(STATE_CURRENT_MODE, 0));            mScrollingWhileRefreshingEnabled = bundle.getBoolean(STATE_SCROLLING_REFRESHING_ENABLED, false);            mShowViewWhileRefreshing = bundle.getBoolean(STATE_SHOW_REFRESHING_VIEW, true);            // Let super Restore Itself            super.onRestoreInstanceState(bundle.getParcelable(STATE_SUPER));            State viewState = State.mapIntToValue(bundle.getInt(STATE_STATE, 0));            if (viewState == State.REFRESHING || viewState == State.MANUAL_REFRESHING) {                setState(viewState, true);            }            // Now let derivative classes restore their state            onPtrRestoreInstanceState(bundle);            return;        }        super.onRestoreInstanceState(state);    }    @Override    protected final Parcelable onSaveInstanceState() {        Bundle bundle = new Bundle();        // Let derivative classes get a chance to save state first, that way we        // can make sure they don't overrite any of our values        onPtrSaveInstanceState(bundle);        bundle.putInt(STATE_STATE, mState.getIntValue());        bundle.putInt(STATE_MODE, mMode.getIntValue());        bundle.putInt(STATE_CURRENT_MODE, mCurrentMode.getIntValue());        bundle.putBoolean(STATE_SCROLLING_REFRESHING_ENABLED, mScrollingWhileRefreshingEnabled);        bundle.putBoolean(STATE_SHOW_REFRESHING_VIEW, mShowViewWhileRefreshing);        bundle.putParcelable(STATE_SUPER, super.onSaveInstanceState());        return bundle;    }    @Override    protected final void onSizeChanged(int w, int h, int oldw, int oldh) {        if (DEBUG) {            Log.d(LOG_TAG, String.format("onSizeChanged. W: %d, H: %d", w, h));        }        super.onSizeChanged(w, h, oldw, oldh);        // We need to update the header/footer when our size changes        refreshLoadingViewsSize();        // Update the Refreshable View layout        refreshRefreshableViewSize(w, h);        /**         * As we're currently in a Layout Pass, we need to schedule another one         * to layout any changes we've made here         */        post(new Runnable() {            @Override            public void run() {                requestLayout();            }        });    }    /**     * Re-measure the Loading Views height, and adjust internal padding as     * necessary     */    protected final void refreshLoadingViewsSize() {        final int maximumPullScroll = (int) (getMaximumPullScroll() * 1.2f);        int pLeft = getPaddingLeft();        int pTop = getPaddingTop();        int pRight = getPaddingRight();        int pBottom = getPaddingBottom();        switch (getPullToRefreshScrollDirection()) {            case HORIZONTAL:                if (mMode.showHeaderLoadingLayout()) {                    mHeaderLayout.setWidth(maximumPullScroll);                    pLeft = -maximumPullScroll;                } else {                    pLeft = 0;                }                if (mMode.showFooterLoadingLayout()) {                    mFooterLayout.setWidth(maximumPullScroll);                    pRight = -maximumPullScroll;                } else {                    pRight = 0;                }                break;            case VERTICAL:                if (mMode.showHeaderLoadingLayout()) {                    mHeaderLayout.setHeight(maximumPullScroll);                    pTop = -maximumPullScroll;                } else {                    pTop = 0;                }                if (mMode.showFooterLoadingLayout()) {                    mFooterLayout.setHeight(maximumPullScroll);                    pBottom = -maximumPullScroll;                } else {                    pBottom = 0;                }                break;        }        if (DEBUG) {            Log.d(LOG_TAG, String.format("Setting Padding. L: %d, T: %d, R: %d, B: %d", pLeft, pTop, pRight, pBottom));        }        setPadding(pLeft, pTop, pRight, pBottom);    }    protected final void refreshRefreshableViewSize(int width, int height) {        // We need to set the Height of the Refreshable View to the same as        // this layout        LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) mRefreshableViewWrapper.getLayoutParams();        switch (getPullToRefreshScrollDirection()) {            case HORIZONTAL:                if (lp.width != width) {                    lp.width = width;                    mRefreshableViewWrapper.requestLayout();                }                break;            case VERTICAL:                if (lp.height != height) {                    lp.height = height;                    mRefreshableViewWrapper.requestLayout();                }                break;        }    }    /**     * Helper method which just calls scrollTo() in the correct scrolling     * direction.     *     * @param value - New Scroll value     */    protected final void setHeaderScroll(int value) {        if (DEBUG) {            Log.d(LOG_TAG, "setHeaderScroll: " + value);        }        // Clamp value to with pull scroll range        final int maximumPullScroll = getMaximumPullScroll();        value = Math.min(maximumPullScroll, Math.max(-maximumPullScroll, value));        if (mLayoutVisibilityChangesEnabled) {            if (value < 0) {                mHeaderLayout.setVisibility(View.VISIBLE);            } else if (value > 0) {                mFooterLayout.setVisibility(View.VISIBLE);            } else {                mHeaderLayout.setVisibility(View.INVISIBLE);                mFooterLayout.setVisibility(View.INVISIBLE);            }        }        if (USE_HW_LAYERS) {            /**             * Use a Hardware Layer on the Refreshable View if we've scrolled at             * all. We don't use them on the Header/Footer Views as they change             * often, which would negate any HW layer performance boost.             */            ViewCompat.setLayerType(mRefreshableViewWrapper, value != 0 ? View.LAYER_TYPE_HARDWARE                    : View.LAYER_TYPE_NONE);        }        switch (getPullToRefreshScrollDirection()) {            case VERTICAL:                scrollTo(0, value);                break;            case HORIZONTAL:                scrollTo(value, 0);                break;        }    }    /**     * Smooth Scroll to position using the default duration of     * {@value #SMOOTH_SCROLL_DURATION_MS} ms.     *     * @param scrollValue - Position to scroll to     */    protected final void smoothScrollTo(int scrollValue) {        smoothScrollTo(scrollValue, getPullToRefreshScrollDuration());    }    /**     * Smooth Scroll to position using the default duration of     * {@value #SMOOTH_SCROLL_DURATION_MS} ms.     *     * @param scrollValue - Position to scroll to     * @param listener - Listener for scroll     */    protected final void smoothScrollTo(int scrollValue, OnSmoothScrollFinishedListener listener) {        smoothScrollTo(scrollValue, getPullToRefreshScrollDuration(), 0, listener);    }    /**     * Smooth Scroll to position using the longer default duration of     * {@value #SMOOTH_SCROLL_LONG_DURATION_MS} ms.     *     * @param scrollValue - Position to scroll to     */    protected final void smoothScrollToLonger(int scrollValue) {        smoothScrollTo(scrollValue, getPullToRefreshScrollDurationLonger());    }    /**     * Updates the View State when the mode has been set. This does not do any     * checking that the mode is different to current state so always updates.     */    protected void updateUIForMode() {        // We need to use the correct LayoutParam values, based on scroll        // direction        final LinearLayout.LayoutParams lp = getLoadingLayoutLayoutParams();        // Remove Header, and then add Header Loading View again if needed        if (this == mHeaderLayout.getParent()) {            removeView(mHeaderLayout);        }        if (mMode.showHeaderLoadingLayout()) {            addViewInternal(mHeaderLayout, 0, lp);        }        // Remove Footer, and then add Footer Loading View again if needed        if (this == mFooterLayout.getParent()) {            removeView(mFooterLayout);        }        if (mMode.showFooterLoadingLayout()) {            addViewInternal(mFooterLayout, lp);        }        // Hide Loading Views        refreshLoadingViewsSize();        // If we're not using Mode.BOTH, set mCurrentMode to mMode, otherwise        // set it to pull down        mCurrentMode = (mMode != Mode.BOTH) ? mMode : Mode.PULL_FROM_START;    }    private void addRefreshableView(Context context, T refreshableView) {        mRefreshableViewWrapper = new FrameLayout(context);        mRefreshableViewWrapper.addView(refreshableView, ViewGroup.LayoutParams.MATCH_PARENT,                ViewGroup.LayoutParams.MATCH_PARENT);        addViewInternal(mRefreshableViewWrapper, new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT,                LayoutParams.MATCH_PARENT));    }    private void callRefreshListener() {        if (null != mOnRefreshListener) {            mOnRefreshListener.onRefresh(this);        } else if (null != mOnRefreshListener2) {            if (mCurrentMode == Mode.PULL_FROM_START) {                mOnRefreshListener2.onPullDownToRefresh(this);            } else if (mCurrentMode == Mode.PULL_FROM_END) {                mOnRefreshListener2.onPullUpToRefresh(this);            }        }    }    @SuppressWarnings("deprecation")    private void init(Context context, AttributeSet attrs) {        switch (getPullToRefreshScrollDirection()) {            case HORIZONTAL:                setOrientation(LinearLayout.HORIZONTAL);                break;            case VERTICAL:            default:                setOrientation(LinearLayout.VERTICAL);                break;        }        setGravity(Gravity.CENTER);        ViewConfiguration config = ViewConfiguration.get(context);        mTouchSlop = config.getScaledTouchSlop();        // Styleables from XML        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PullToRefresh);        if (a.hasValue(R.styleable.PullToRefresh_ptrMode)) {            mMode = Mode.mapIntToValue(a.getInteger(R.styleable.PullToRefresh_ptrMode, 0));        }        if (a.hasValue(R.styleable.PullToRefresh_ptrAnimationStyle)) {            mLoadingAnimationStyle = AnimationStyle.mapIntToValue(a.getInteger(                    R.styleable.PullToRefresh_ptrAnimationStyle, 0));        }        // Refreshable View        // By passing the attrs, we can add ListView/GridView params via XML        mRefreshableView = createRefreshableView(context, attrs);        addRefreshableView(context, mRefreshableView);        // We need to create now layouts now        mHeaderLayout = createLoadingLayout(context, Mode.PULL_FROM_START, a);        mFooterLayout = createLoadingLayout(context, Mode.PULL_FROM_END, a);        /**         * Styleables from XML         */        if (a.hasValue(R.styleable.PullToRefresh_ptrRefreshableViewBackground)) {            Drawable background = a.getDrawable(R.styleable.PullToRefresh_ptrRefreshableViewBackground);            if (null != background) {                mRefreshableView.setBackgroundDrawable(background);            }        } else if (a.hasValue(R.styleable.PullToRefresh_ptrAdapterViewBackground)) {            Utils.warnDeprecation("ptrAdapterViewBackground", "ptrRefreshableViewBackground");            Drawable background = a.getDrawable(R.styleable.PullToRefresh_ptrAdapterViewBackground);            if (null != background) {                mRefreshableView.setBackgroundDrawable(background);            }        }        if (a.hasValue(R.styleable.PullToRefresh_ptrOverScroll)) {            mOverScrollEnabled = a.getBoolean(R.styleable.PullToRefresh_ptrOverScroll, true);        }        if (a.hasValue(R.styleable.PullToRefresh_ptrScrollingWhileRefreshingEnabled)) {            mScrollingWhileRefreshingEnabled = a.getBoolean(                    R.styleable.PullToRefresh_ptrScrollingWhileRefreshingEnabled, false);        }        // Let the derivative classes have a go at handling attributes, then        // recycle them...        handleStyledAttributes(a);        a.recycle();        // Finally update the UI for the modes        updateUIForMode();    }    private boolean isReadyForPull() {        switch (mMode) {            case PULL_FROM_START:                return isReadyForPullStart();            case PULL_FROM_END:                return isReadyForPullEnd();            case BOTH:                return isReadyForPullEnd() || isReadyForPullStart();            default:                return false;        }    }    /**     * Actions a Pull Event     *     * @return true if the Event has been handled, false if there has been no     *         change     */    private void pullEvent() {        final int newScrollValue;        final int itemDimension;        final float initialMotionValue, lastMotionValue;        switch (getPullToRefreshScrollDirection()) {            case HORIZONTAL:                initialMotionValue = mInitialMotionX;                lastMotionValue = mLastMotionX;                break;            case VERTICAL:            default:                initialMotionValue = mInitialMotionY;                lastMotionValue = mLastMotionY;                break;        }        switch (mCurrentMode) {            case PULL_FROM_END:                newScrollValue = Math.round(Math.max(initialMotionValue - lastMotionValue, 0) / FRICTION);                itemDimension = getFooterSize();                break;            case PULL_FROM_START:            default:                newScrollValue = Math.round(Math.min(initialMotionValue - lastMotionValue, 0) / FRICTION);                itemDimension = getHeaderSize();                break;        }        setHeaderScroll(newScrollValue);        if (newScrollValue != 0 && !isRefreshing()) {            float scale = Math.abs(newScrollValue) / (float) itemDimension;            switch (mCurrentMode) {                case PULL_FROM_END:                    mFooterLayout.onPull(scale);                    break;                case PULL_FROM_START:                default:                    mHeaderLayout.onPull(scale);                    break;            }            if (mState != State.PULL_TO_REFRESH && itemDimension >= Math.abs(newScrollValue)) {                setState(State.PULL_TO_REFRESH);            } else if (mState == State.PULL_TO_REFRESH && itemDimension < Math.abs(newScrollValue)) {                setState(State.RELEASE_TO_REFRESH);            }        }    }    private LinearLayout.LayoutParams getLoadingLayoutLayoutParams() {        switch (getPullToRefreshScrollDirection()) {            case HORIZONTAL:                return new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,                        LinearLayout.LayoutParams.MATCH_PARENT);            case VERTICAL:            default:                return new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,                        LinearLayout.LayoutParams.WRAP_CONTENT);        }    }    private int getMaximumPullScroll() {        switch (getPullToRefreshScrollDirection()) {            case HORIZONTAL:                return Math.round(getWidth() / FRICTION);            case VERTICAL:            default:                return Math.round(getHeight() / FRICTION);        }    }    /**     * Smooth Scroll to position using the specific duration     *     * @param scrollValue - Position to scroll to     * @param duration - Duration of animation in milliseconds     */    private final void smoothScrollTo(int scrollValue, long duration) {        smoothScrollTo(scrollValue, duration, 0, null);    }    private final void smoothScrollTo(int newScrollValue, long duration, long delayMillis,                                      OnSmoothScrollFinishedListener listener) {        if (null != mCurrentSmoothScrollRunnable) {            mCurrentSmoothScrollRunnable.stop();        }        final int oldScrollValue;        switch (getPullToRefreshScrollDirection()) {            case HORIZONTAL:                oldScrollValue = getScrollX();                break;            case VERTICAL:            default:                oldScrollValue = getScrollY();                break;        }        if (oldScrollValue != newScrollValue) {            if (null == mScrollAnimationInterpolator) {                // Default interpolator is a Decelerate Interpolator                mScrollAnimationInterpolator = new DecelerateInterpolator();            }            mCurrentSmoothScrollRunnable = new SmoothScrollRunnable(oldScrollValue, newScrollValue, duration, listener);            if (delayMillis > 0) {                postDelayed(mCurrentSmoothScrollRunnable, delayMillis);            } else {                post(mCurrentSmoothScrollRunnable);            }        }    }    private final void smoothScrollToAndBack(int y) {        smoothScrollTo(y, SMOOTH_SCROLL_DURATION_MS, 0, new OnSmoothScrollFinishedListener() {            @Override            public void onSmoothScrollFinished() {                smoothScrollTo(0, SMOOTH_SCROLL_DURATION_MS, DEMO_SCROLL_INTERVAL, null);            }        });    }    public static enum AnimationStyle {        /**         * This is the default for Android-PullToRefresh. Allows you to use any         * drawable, which is automatically rotated and used as a Progress Bar.         */        ROTATE,        /**         * This is the old default, and what is commonly used on iOS. Uses an         * arrow image which flips depending on where the user has scrolled.         */        FLIP;        static AnimationStyle getDefault() {            return ROTATE;        }        /**         * Maps an int to a specific mode. This is needed when saving state, or         * inflating the view from XML where the mode is given through a attr         * int.         *         * @param modeInt - int to map a Mode to         * @return Mode that modeInt maps to, or ROTATE by default.         */        static AnimationStyle mapIntToValue(int modeInt) {            switch (modeInt) {                case 0x0:                default:                    return ROTATE;                case 0x1:                    return FLIP;            }        }        LoadingLayout createLoadingLayout(Context context, Mode mode, Orientation scrollDirection, TypedArray attrs) {            switch (this) {                case ROTATE:                default:                    return new RotateLoadingLayout(context, mode, scrollDirection, attrs);                case FLIP:                    return new FlipLoadingLayout(context, mode, scrollDirection, attrs);            }        }    }    public static enum Mode {        /**         * Disable all Pull-to-Refresh gesture and Refreshing handling         */        DISABLED(0x0),        /**         * Only allow the user to Pull from the start of the Refreshable View to         * refresh. The start is either the Top or Left, depending on the         * scrolling direction.         */        PULL_FROM_START(0x1),        /**         * Only allow the user to Pull from the end of the Refreshable View to         * refresh. The start is either the Bottom or Right, depending on the         * scrolling direction.         */        PULL_FROM_END(0x2),        /**         * Allow the user to both Pull from the start, from the end to refresh.         */        BOTH(0x3),        /**         * Disables Pull-to-Refresh gesture handling, but allows manually         * setting the Refresh state via         * {@link PullToRefreshBase#setRefreshing() setRefreshing()}.         */        MANUAL_REFRESH_ONLY(0x4);        /**         * @deprecated Use {@link #PULL_FROM_START} from now on.         */        public static Mode PULL_DOWN_TO_REFRESH = Mode.PULL_FROM_START;        /**         * @deprecated Use {@link #PULL_FROM_END} from now on.         */        public static Mode PULL_UP_TO_REFRESH = Mode.PULL_FROM_END;        /**         * Maps an int to a specific mode. This is needed when saving state, or         * inflating the view from XML where the mode is given through a attr         * int.         *         * @param modeInt - int to map a Mode to         * @return Mode that modeInt maps to, or PULL_FROM_START by default.         */        static Mode mapIntToValue(final int modeInt) {            for (Mode value : Mode.values()) {                if (modeInt == value.getIntValue()) {                    return value;                }            }            // If not, return default            return getDefault();        }        static Mode getDefault() {            return PULL_FROM_START;        }        private int mIntValue;        // The modeInt values need to match those from attrs.xml        Mode(int modeInt) {            mIntValue = modeInt;        }        /**         * @return true if the mode permits Pull-to-Refresh         */        boolean permitsPullToRefresh() {            return !(this == DISABLED || this == MANUAL_REFRESH_ONLY);        }        /**         * @return true if this mode wants the Loading Layout Header to be shown         */        public boolean showHeaderLoadingLayout() {            return this == PULL_FROM_START || this == BOTH;        }        /**         * @return true if this mode wants the Loading Layout Footer to be shown         */        public boolean showFooterLoadingLayout() {            return this == PULL_FROM_END || this == BOTH || this == MANUAL_REFRESH_ONLY;        }        int getIntValue() {            return mIntValue;        }    }    // ===========================================================    // Inner, Anonymous Classes, and Enumerations    // ===========================================================    /**     * Simple Listener that allows you to be notified when the user has scrolled     * to the end of the AdapterView. See (     * {@link PullToRefreshAdapterViewBase#setOnLastItemVisibleListener}.     *     * @author Chris Banes     */    public static interface OnLastItemVisibleListener {        /**         * Called when the user has scrolled to the end of the list         */        public void onLastItemVisible();    }    /**     * Listener that allows you to be notified when the user has started or     * finished a touch event. Useful when you want to append extra UI events     * (such as sounds). See (     * {@link PullToRefreshAdapterViewBase#setOnPullEventListener}.     *     * @author Chris Banes     */    public static interface OnPullEventListener<V extends View> {        /**         * Called when the internal state has been changed, usually by the user         * pulling.         *         * @param refreshView - View which has had it's state change.         * @param state - The new state of View.         * @param direction - One of {@link Mode#PULL_FROM_START} or         *            {@link Mode#PULL_FROM_END} depending on which direction         *            the user is pulling. Only useful when <var>state</var> is         *            {@link State#PULL_TO_REFRESH} or         *            {@link State#RELEASE_TO_REFRESH}.         */        public void onPullEvent(final PullToRefreshBase<V> refreshView, State state, Mode direction);    }    /**     * Simple Listener to listen for any callbacks to Refresh.     *     * @author Chris Banes     */    public static interface OnRefreshListener<V extends View> {        /**         * onRefresh will be called for both a Pull from start, and Pull from         * end         */        public void onRefresh(final PullToRefreshBase<V> refreshView);    }    /**     * An advanced version of the Listener to listen for callbacks to Refresh.     * This listener is different as it allows you to differentiate between Pull     * Ups, and Pull Downs.     *     * @author Chris Banes     */    public static interface OnRefreshListener2<V extends View> {        // TODO These methods need renaming to START/END rather than DOWN/UP        /**         * onPullDownToRefresh will be called only when the user has Pulled from         * the start, and released.         */        public void onPullDownToRefresh(final PullToRefreshBase<V> refreshView);        /**         * onPullUpToRefresh will be called only when the user has Pulled from         * the end, and released.         */        public void onPullUpToRefresh(final PullToRefreshBase<V> refreshView);    }    public static enum Orientation {        VERTICAL, HORIZONTAL;    }    public static enum State {        /**         * When the UI is in a state which means that user is not interacting         * with the Pull-to-Refresh function.         */        RESET(0x0),        /**         * When the UI is being pulled by the user, but has not been pulled far         * enough so that it refreshes when released.         */        PULL_TO_REFRESH(0x1),        /**         * When the UI is being pulled by the user, and <strong>has</strong>         * been pulled far enough so that it will refresh when released.         */        RELEASE_TO_REFRESH(0x2),        /**         * When the UI is currently refreshing, caused by a pull gesture.         */        REFRESHING(0x8),        /**         * When the UI is currently refreshing, caused by a call to         * {@link PullToRefreshBase#setRefreshing() setRefreshing()}.         */        MANUAL_REFRESHING(0x9),        /**         * When the UI is currently overscrolling, caused by a fling on the         * Refreshable View.         */        OVERSCROLLING(0x10);        /**         * Maps an int to a specific state. This is needed when saving state.         *         * @param stateInt - int to map a State to         * @return State that stateInt maps to         */        static State mapIntToValue(final int stateInt) {            for (State value : State.values()) {                if (stateInt == value.getIntValue()) {                    return value;                }            }            // If not, return default            return RESET;        }        private int mIntValue;        State(int intValue) {            mIntValue = intValue;        }        int getIntValue() {            return mIntValue;        }    }    final class SmoothScrollRunnable implements Runnable {        private final Interpolator mInterpolator;        private final int mScrollToY;        private final int mScrollFromY;        private final long mDuration;        private OnSmoothScrollFinishedListener mListener;        private boolean mContinueRunning = true;        private long mStartTime = -1;        private int mCurrentY = -1;        public SmoothScrollRunnable(int fromY, int toY, long duration, OnSmoothScrollFinishedListener listener) {            mScrollFromY = fromY;            mScrollToY = toY;            mInterpolator = mScrollAnimationInterpolator;            mDuration = duration;            mListener = listener;        }        @Override        public void run() {            /**             * Only set mStartTime if this is the first time we're starting,             * else actually calculate the Y delta             */            if (mStartTime == -1) {                mStartTime = System.currentTimeMillis();            } else {                /**                 * We do do all calculations in long to reduce software float                 * calculations. We use 1000 as it gives us good accuracy and                 * small rounding errors                 */                long normalizedTime = (1000 * (System.currentTimeMillis() - mStartTime)) / mDuration;                normalizedTime = Math.max(Math.min(normalizedTime, 1000), 0);                final int deltaY = Math.round((mScrollFromY - mScrollToY)                        * mInterpolator.getInterpolation(normalizedTime / 1000f));                mCurrentY = mScrollFromY - deltaY;                setHeaderScroll(mCurrentY);            }            // If we're not at the target Y, keep going...            if (mContinueRunning && mScrollToY != mCurrentY) {                ViewCompat.postOnAnimation(PullToRefreshBase.this, this);            } else {                if (null != mListener) {                    mListener.onSmoothScrollFinished();                }            }        }        public void stop() {            mContinueRunning = false;            removeCallbacks(this);        }    }    static interface OnSmoothScrollFinishedListener {        void onSmoothScrollFinished();    }}

2、PullToRefreshRecyclerView.java

/******************************************************************************* * Copyright 2014 Dean Ding. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *******************************************************************************/package com.handmark.pulltorefresh.library;import android.content.Context;import android.support.v7.widget.RecyclerView;import android.util.AttributeSet;/** * * Support RecyclerView * * @author Dean.Ding * */public class PullToRefreshRecyclerView extends PullToRefreshBase<RecyclerView> {    public PullToRefreshRecyclerView(Context context) {        super(context);    }    public PullToRefreshRecyclerView(Context context, AttributeSet attrs) {        super(context, attrs);    }    public PullToRefreshRecyclerView(Context context, Mode mode) {        super(context, mode);    }    public PullToRefreshRecyclerView(Context context, Mode mode, AnimationStyle style) {        super(context, mode, style);    }    @Override    public final Orientation getPullToRefreshScrollDirection() {        return Orientation.VERTICAL;    }    @Override    protected RecyclerView createRefreshableView(Context context, AttributeSet attrs) {        RecyclerView recyclerView;        recyclerView = new RecyclerView(context, attrs);        recyclerView.setId(R.id.recyclerview);        return recyclerView;    }    @Override    protected boolean isReadyForPullStart() {        if (mRefreshableView.getChildCount() <= 0)            return true;        int firstVisiblePosition = mRefreshableView.getChildPosition(mRefreshableView.getChildAt(0));        if (firstVisiblePosition == 0)            return mRefreshableView.getChildAt(0).getTop() == mRefreshableView.getPaddingTop();        else            return false;    }    @Override    protected boolean isReadyForPullEnd() {        int lastVisiblePosition = mRefreshableView.getChildPosition(mRefreshableView.getChildAt(mRefreshableView.getChildCount() -1));        if (lastVisiblePosition >= mRefreshableView.getAdapter().getItemCount()-1) {            return mRefreshableView.getChildAt(mRefreshableView.getChildCount() - 1).getBottom() <= mRefreshableView.getBottom();        }        return false;    }}

3、ids.xml文件添加一个id

<?xml version="1.0" encoding="utf-8"?><resources>    <item name="gridview" type="id" />    <item name="webview" type="id" />    <item name="scrollview" type="id" />    <item name="recyclerview" type="id" /></resources>

4、ending.