AndroidUI组件---SlidingTabLayout实现ViewPager页卡滑动效果

使用SlidingTabLayout需要准备2个类，分别是 SlidingTabLayout，与SlidingTabStrip，，放进项目中时只用修改下包名即可。

效果制作的不是很好。
这篇文章，也是在网上搜了很多资源参考，对 SlidingTabLayout.java和SlidingTabStrip.java进行了修改。大家可以更改他的格式字体大小、选中状态，分割线调整等等。先上传这两个文件，改动支出都做了注释。
SlidingTabLayout.java

/* * Copyright (C) 2013 The Android Open Source Project * * 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.example.my.slidingtablayout;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Color;import android.graphics.Typeface;import android.os.Build;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.util.AttributeSet;import android.util.TypedValue;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.widget.HorizontalScrollView;import android.widget.LinearLayout;import android.widget.TextView;/** * To be used with ViewPager to provide a tab indicator component which give constant feedback as to * the user's scroll progress. * <p> * To use the component, simply add it to your view hierarchy. Then in your * {@link android.app.Activity} or {@link android.support.v4.app.Fragment} call * {@link #setViewPager(ViewPager)} providing it the ViewPager this layout is being used for. * <p> * The colors can be customized in two ways. The first and simplest is to provide an array of colors * via {@link #setSelectedIndicatorColors(int...)} and {@link #setDividerColors(int...)}. The * alternative is via the {@link TabColorizer} interface which provides you complete control over * which color is used for any individual position. * <p> * The views used as tabs can be customized by calling {@link #setCustomTabView(int, int)}, * providing the layout ID of your custom layout. */public class SlidingTabLayout extends HorizontalScrollView {    /**     * Allows complete control over the colors drawn in the tab layout. Set with     * {@link #setCustomTabColorizer(TabColorizer)}.     */    public interface TabColorizer {        /**         * @return return the color of the indicator used when {@code position} is selected.         */        int getIndicatorColor(int position);        /**         * @return return the color of the divider drawn to the right of {@code position}.         */        int getDividerColor(int position);    }    private static final int TITLE_OFFSET_DIPS = 24;    private static final int TAB_VIEW_PADDING_DIPS = 16;   //内边距    private static int TAB_VIEW_TEXT_SIZE_SP = 16;   //字体大小    private int mTitleOffset;    private int mTabViewLayoutId;    private int mTabViewTextViewId;    // 定义两种需要添加的选项卡颜色    private int mDefaultTextColor;    private int mSelectedTextColor;    private ViewPager mViewPager;    private ViewPager.OnPageChangeListener mViewPagerPageChangeListener;    private final SlidingTabStrip mTabStrip;    public SlidingTabLayout(Context context) {        this(context, null);    }    public SlidingTabLayout(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public SlidingTabLayout(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        // 获取选项卡颜色，如果未定义的话，则使用主题默认的颜色        TypedArray a = context.obtainStyledAttributes(attrs,                R.styleable.SlidingTabLayout);        int defaultTextColor = a.getColor(                R.styleable.SlidingTabLayout_android_textColorPrimary, 0);        mDefaultTextColor = a.getColor(                R.styleable.SlidingTabLayout_textColorTabDefault, defaultTextColor);        mSelectedTextColor = a.getColor(                R.styleable.SlidingTabLayout_textColorTabSelected ,defaultTextColor);        a.recycle();        // Disable the Scroll Bar        setHorizontalScrollBarEnabled(false);        // Make sure that the Tab Strips fills this View        setFillViewport(true);        mTitleOffset = (int) (TITLE_OFFSET_DIPS * getResources().getDisplayMetrics().density);        mTabStrip = new SlidingTabStrip(context);        addView(mTabStrip, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);    }    // 在每次选项改变时更新选项卡文本颜色的新方法    private void updateSelectedTitle(int position) {        final PagerAdapter adapter = mViewPager.getAdapter();        for (int i = 0; i < adapter.getCount(); i++) {            final View tabView = mTabStrip.getChildAt(i);            if (TextView.class.isInstance(tabView)) {                TextView titleView = (TextView)tabView;                boolean isSelected = i == position;                titleView.setTextColor(isSelected ? mSelectedTextColor : mDefaultTextColor);            }        }    }    /**     * Set the custom {@link TabColorizer} to be used.     * <p>     * If you only require simple custmisation then you can use     * {@link #setSelectedIndicatorColors(int...)} and {@link #setDividerColors(int...)} to achieve     * similar effects.     */    public void setCustomTabColorizer(TabColorizer tabColorizer) {        mTabStrip.setCustomTabColorizer(tabColorizer);    }    /**     * Sets the colors to be used for indicating the selected tab. These colors are treated as a     * circular array. Providing one color will mean that all tabs are indicated with the same color.     */    public void setSelectedIndicatorColors(int... colors) {        mTabStrip.setSelectedIndicatorColors(colors);    }    /**     * Sets the colors to be used for tab dividers. These colors are treated as a circular array.     * Providing one color will mean that all tabs are indicated with the same color.     */    public void setDividerColors(int... colors) {        mTabStrip.setDividerColors(colors);    }    //...设置字体大小    public void setTitleSize(int size) {        this.TAB_VIEW_TEXT_SIZE_SP = size;    }    /**     * Set the {@link ViewPager.OnPageChangeListener}. When using {@link SlidingTabLayout} you are     * required to set any {@link ViewPager.OnPageChangeListener} through this method. This is so     * that the layout can update it's scroll position correctly.     *     * @see ViewPager#setOnPageChangeListener(ViewPager.OnPageChangeListener)     */    public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) {        mViewPagerPageChangeListener = listener;    }    /**     * Set the custom layout to be inflated for the tab views.     *     * @param layoutResId Layout id to be inflated     * @param textViewId  id of the {@link TextView} in the inflated view     */    public void setCustomTabView(int layoutResId, int textViewId) {        mTabViewLayoutId = layoutResId;        mTabViewTextViewId = textViewId;    }    /**     * Sets the associated view pager. Note that the assumption here is that the pager content     * (number of tabs and tab titles) does not change after this call has been made.     */    public void setViewPager(ViewPager viewPager) {        mTabStrip.removeAllViews();        mViewPager = viewPager;        if (viewPager != null) {            viewPager.setOnPageChangeListener(new InternalViewPagerListener());            populateTabStrip();        }    }    /**     * Create a default view to be used for tabs. This is called if a custom tab view is not set via     * {@link #setCustomTabView(int, int)}.     */    protected TextView createDefaultTabView(Context context) {        TextView textView = new TextView(context);        textView.setGravity(Gravity.CENTER);        textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, TAB_VIEW_TEXT_SIZE_SP);        textView.setTypeface(Typeface.DEFAULT_BOLD);        //...这会移除 Holo 的默认背景强调以及选项卡的粗体文本        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {            // If we're running on Honeycomb or newer, then we can use the Theme's            // selectableItemBackground to ensure that the View has a pressed state            TypedValue outValue = new TypedValue();            getContext().getTheme().resolveAttribute(android.R.attr.selectableItemBackground,                    outValue, true);            textView.setBackgroundResource(outValue.resourceId);        }        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {            // If we're running on ICS or newer, enable all-caps to match the Action Bar tab style            textView.setAllCaps(true);        }        int padding = (int) (TAB_VIEW_PADDING_DIPS * getResources().getDisplayMetrics().density);        textView.setPadding(padding, padding, padding, padding);        return textView;    }    private void populateTabStrip() {        final PagerAdapter adapter = mViewPager.getAdapter();        final OnClickListener tabClickListener = new TabClickListener();        for (int i = 0; i < adapter.getCount(); i++) {            View tabView = null;            TextView tabTitleView = null;            if (mTabViewLayoutId != 0) {                // If there is a custom tab view layout id set, try and inflate it                tabView = LayoutInflater.from(getContext()).inflate(mTabViewLayoutId, mTabStrip,                        false);                tabTitleView = (TextView) tabView.findViewById(mTabViewTextViewId);            }            if (tabView == null) {                tabView = createDefaultTabView(getContext());            }            if (tabTitleView == null && TextView.class.isInstance(tabView)) {                tabTitleView = (TextView) tabView;            }            tabTitleView.setText(adapter.getPageTitle(i));            //... 设置头部均分            LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(0, LayoutParams.WRAP_CONTENT, 1.0f);            tabView.setLayoutParams(layoutParams);            tabView.setOnClickListener(tabClickListener);            mTabStrip.addView(tabView);        }    }    @Override    protected void onAttachedToWindow() {        super.onAttachedToWindow();        if (mViewPager != null) {            scrollToTab(mViewPager.getCurrentItem(), 0);        }    }    private void scrollToTab(int tabIndex, int positionOffset) {        final int tabStripChildCount = mTabStrip.getChildCount();        if (tabStripChildCount == 0 || tabIndex < 0 || tabIndex >= tabStripChildCount) {            return;        }        View selectedChild = mTabStrip.getChildAt(tabIndex);        if (selectedChild != null) {            // 调用在每次选项改变时更新文本颜色的新方案            updateSelectedTitle(tabIndex);            int targetScrollX = selectedChild.getLeft() + positionOffset;            if (tabIndex > 0 || positionOffset > 0) {                // If we're not at the first child and are mid-scroll, make sure we obey the offset                targetScrollX -= mTitleOffset;            }            scrollTo(targetScrollX, 0);        }    }    private class InternalViewPagerListener implements ViewPager.OnPageChangeListener {        private int mScrollState;        @Override        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {            int tabStripChildCount = mTabStrip.getChildCount();            if ((tabStripChildCount == 0) || (position < 0) || (position >= tabStripChildCount)) {                return;            }            mTabStrip.onViewPagerPageChanged(position, positionOffset);            View selectedTitle = mTabStrip.getChildAt(position);            int extraOffset = (selectedTitle != null)                    ? (int) (positionOffset * selectedTitle.getWidth())                    : 0;            scrollToTab(position, extraOffset);            if (mViewPagerPageChangeListener != null) {                mViewPagerPageChangeListener.onPageScrolled(position, positionOffset,                        positionOffsetPixels);            }        }        @Override        public void onPageScrollStateChanged(int state) {            mScrollState = state;            if (mViewPagerPageChangeListener != null) {                mViewPagerPageChangeListener.onPageScrollStateChanged(state);            }        }        @Override        public void onPageSelected(int position) {            if (mScrollState == ViewPager.SCROLL_STATE_IDLE) {                mTabStrip.onViewPagerPageChanged(position, 0f);                scrollToTab(position, 0);            }            if (mViewPagerPageChangeListener != null) {                mViewPagerPageChangeListener.onPageSelected(position);            }        }    }    private class TabClickListener implements OnClickListener {        @Override        public void onClick(View v) {            for (int i = 0; i < mTabStrip.getChildCount(); i++) {                if (v == mTabStrip.getChildAt(i)) {                    mViewPager.setCurrentItem(i);                    return;                }            }        }    }}

SlidingTabStrip.java

/* * Copyright (C) 2013 The Android Open Source Project * * 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.example.my.slidingtablayout;import android.R;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.util.AttributeSet;import android.util.TypedValue;import android.view.View;import android.widget.LinearLayout;class SlidingTabStrip extends LinearLayout {    private static final int DEFAULT_BOTTOM_BORDER_THICKNESS_DIPS = 0;  //去除阴影    private static final byte DEFAULT_BOTTOM_BORDER_COLOR_ALPHA = 0x26;    private static final int SELECTED_INDICATOR_THICKNESS_DIPS = 4;     //设置滚动条的高度    private static final int DEFAULT_SELECTED_INDICATOR_COLOR = 0xFF33B5E5;    private static final int DEFAULT_DIVIDER_THICKNESS_DIPS = 1;    private static final byte DEFAULT_DIVIDER_COLOR_ALPHA = 0x20;    private static final float DEFAULT_DIVIDER_HEIGHT = 0.5f;    private final int mBottomBorderThickness;    private final Paint mBottomBorderPaint;    private final int mSelectedIndicatorThickness;    private final Paint mSelectedIndicatorPaint;    private final int mDefaultBottomBorderColor;    private final Paint mDividerPaint;    private final float mDividerHeight;    private int mSelectedPosition;    private float mSelectionOffset;    private SlidingTabLayout.TabColorizer mCustomTabColorizer;    private final SimpleTabColorizer mDefaultTabColorizer;    SlidingTabStrip(Context context) {        this(context, null);    }    SlidingTabStrip(Context context, AttributeSet attrs) {        super(context, attrs);        setWillNotDraw(false);        final float density = getResources().getDisplayMetrics().density;        TypedValue outValue = new TypedValue();        context.getTheme().resolveAttribute(R.attr.colorForeground, outValue, true);        final int themeForegroundColor = outValue.data;        mDefaultBottomBorderColor = setColorAlpha(themeForegroundColor,                DEFAULT_BOTTOM_BORDER_COLOR_ALPHA);        mDefaultTabColorizer = new SimpleTabColorizer();        mDefaultTabColorizer.setIndicatorColors(DEFAULT_SELECTED_INDICATOR_COLOR);        mDefaultTabColorizer.setDividerColors(setColorAlpha(themeForegroundColor,                DEFAULT_DIVIDER_COLOR_ALPHA));        mBottomBorderThickness = (int) (DEFAULT_BOTTOM_BORDER_THICKNESS_DIPS * density);        mBottomBorderPaint = new Paint();        mBottomBorderPaint.setColor(mDefaultBottomBorderColor);        mSelectedIndicatorThickness = (int) (SELECTED_INDICATOR_THICKNESS_DIPS * density);        mSelectedIndicatorPaint = new Paint();        mDividerHeight = DEFAULT_DIVIDER_HEIGHT;        mDividerPaint = new Paint();        mDividerPaint.setStrokeWidth((int) (DEFAULT_DIVIDER_THICKNESS_DIPS * density));    }    void setCustomTabColorizer(SlidingTabLayout.TabColorizer customTabColorizer) {        mCustomTabColorizer = customTabColorizer;        invalidate();    }    void setSelectedIndicatorColors(int... colors) {        // Make sure that the custom colorizer is removed        mCustomTabColorizer = null;        mDefaultTabColorizer.setIndicatorColors(colors);        invalidate();    }    void setDividerColors(int... colors) {        // Make sure that the custom colorizer is removed        mCustomTabColorizer = null;        mDefaultTabColorizer.setDividerColors(colors);        invalidate();    }    void onViewPagerPageChanged(int position, float positionOffset) {        mSelectedPosition = position;        mSelectionOffset = positionOffset;        invalidate();    }    @Override    protected void onDraw(Canvas canvas) {        final int height = getHeight();        final int childCount = getChildCount();        final int dividerHeightPx = (int) (Math.min(Math.max(0f, mDividerHeight), 1f) * height);        final SlidingTabLayout.TabColorizer tabColorizer = mCustomTabColorizer != null                ? mCustomTabColorizer                : mDefaultTabColorizer;        // Thick colored underline below the current selection        if (childCount > 0) {            View selectedTitle = getChildAt(mSelectedPosition);            int left = selectedTitle.getLeft();            int right = selectedTitle.getRight();            int color = tabColorizer.getIndicatorColor(mSelectedPosition);            if (mSelectionOffset > 0f && mSelectedPosition < (getChildCount() - 1)) {                int nextColor = tabColorizer.getIndicatorColor(mSelectedPosition + 1);                if (color != nextColor) {                    color = blendColors(nextColor, color, mSelectionOffset);                }                // Draw the selection partway between the tabs                View nextTitle = getChildAt(mSelectedPosition + 1);                left = (int) (mSelectionOffset * nextTitle.getLeft() +                        (1.0f - mSelectionOffset) * left);                right = (int) (mSelectionOffset * nextTitle.getRight() +                        (1.0f - mSelectionOffset) * right);            }            mSelectedIndicatorPaint.setColor(color);            canvas.drawRect(left, height - mSelectedIndicatorThickness, right,                    height, mSelectedIndicatorPaint);        }        // Thin underline along the entire bottom edge        canvas.drawRect(0, height - mBottomBorderThickness, getWidth(), height, mBottomBorderPaint);        // Vertical separators between the titles        int separatorTop = (height - dividerHeightPx) / 2;        for (int i = 0; i < childCount - 1; i++) {            View child = getChildAt(i);            mDividerPaint.setColor(tabColorizer.getDividerColor(i));            canvas.drawLine(child.getRight(), separatorTop, child.getRight(),                    separatorTop + dividerHeightPx, mDividerPaint);        }    }    /**     * Set the alpha value of the {@code color} to be the given {@code alpha} value.     */    private static int setColorAlpha(int color, byte alpha) {        return Color.argb(alpha, Color.red(color), Color.green(color), Color.blue(color));    }    /**     * Blend {@code color1} and {@code color2} using the given ratio.     *     * @param ratio of which to blend. 1.0 will return {@code color1}, 0.5 will give an even blend,     *              0.0 will return {@code color2}.     */    private static int blendColors(int color1, int color2, float ratio) {        final float inverseRation = 1f - ratio;        float r = (Color.red(color1) * ratio) + (Color.red(color2) * inverseRation);        float g = (Color.green(color1) * ratio) + (Color.green(color2) * inverseRation);        float b = (Color.blue(color1) * ratio) + (Color.blue(color2) * inverseRation);        return Color.rgb((int) r, (int) g, (int) b);    }    private static class SimpleTabColorizer implements SlidingTabLayout.TabColorizer {        private int[] mIndicatorColors;    //        private int[] mDividerColors;      //        @Override        public final int getIndicatorColor(int position) {            return mIndicatorColors[position % mIndicatorColors.length];        }        @Override        public final int getDividerColor(int position) {            return mDividerColors[position % mDividerColors.length];        }        void setIndicatorColors(int... colors) {            mIndicatorColors = colors;        }        void setDividerColors(int... colors) {            mDividerColors = colors;        }    }}

上边因为使用了自定义的颜色，所以这里要在attrs.xml声明一下，不然找不到：

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="SlidingTabLayout">        <attr name="android:textColorPrimary" />        <attr name="textColorTabDefault" format="color" />        <attr name="textColorTabSelected" format="color" />    </declare-styleable></resources>

布局文件也要用到自定义：

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    xmlns:app="http://schemas.android.com/apk/res-auto"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.example.my.slidingtablayout.MainActivity">    <!-- 在上方就在上面，在下方就在下面（tab栏） -->    <com.example.my.slidingtablayout.SlidingTabLayout        android:id="@+id/sliding"        android:layout_width="match_parent"        android:layout_height="wrap_content"        app:textColorTabDefault="#000000"        app:textColorTabSelected="@color/colorAccent"        />    <android.support.v4.view.ViewPager        android:id="@+id/view_pager"        android:layout_width="match_parent"        android:layout_height="match_parent"       /></LinearLayout>

最后一道就是在你的Activity运用这种开源：可以调整之处也做了说明

package com.example.my.slidingtablayout;import android.graphics.Color;import android.os.Bundle;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.view.ViewGroup;import android.widget.LinearLayout;import java.util.ArrayList;public class MainActivity extends AppCompatActivity {    //创建 颜色数组 用来做viewpager的背景    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ViewPager pager = (ViewPager) findViewById(R.id.view_pager);        SlidingTabLayout tab = (SlidingTabLayout) findViewById(R.id.sliding);        tab.setDividerColors(Color.TRANSPARENT); //设置标题的分割线        tab.setSelectedIndicatorColors(Color.rgb(51, 181, 229)); //设置滚动条的颜色        tab.setTitleSize(18);  //...设置字体的颜色，默认16        MyAdapte adapter = new MyAdapte();        pager.setAdapter(adapter);        tab.setViewPager(pager);    }    int[] colors = {0xFF123456, 0xFF654321, 0xFF336699};    class MyAdapte extends PagerAdapter {        //可以考虑把这个数组添加到集合里面        String[] titles = {"AA", "BB", "CC"};        ArrayList<LinearLayout> layouts = new ArrayList<LinearLayout>();        MyAdapte() {            for (int i = 0; i < 3; i++) {                LinearLayout l = new LinearLayout(MainActivity.this);                l.setBackgroundColor(colors[i]);                l.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));                layouts.add(l);            }        }        @Override        public int getCount() {            return layouts.size();        }        @Override        public boolean isViewFromObject(View view, Object o) {            return view == o;        }        @Override        public Object instantiateItem(ViewGroup container, int position) {            LinearLayout l = layouts.get(position);            container.addView(l);            return l;        }        @Override        public void destroyItem(ViewGroup container, int position, Object object) {            container.removeView(layouts.get(position));        }        @Override        public CharSequence getPageTitle(int position) {            //...可以返回集合list.get(position);            return titles[position];        }    }}