Listview下拉刷新上拉加载更多
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在Android中ListView下拉刷新、上拉载入更多示例一文中,Maxwin兄给出的控件比较强大,前面有详细介绍,但是有个不足就是,里面使用了一些资源文件,包括图片,String,layout,这样不利于封装打包,下面我将源码进行改进,所有布局全部用代码实现,这样直接将src和assets打包成jar就成了一个非常方便以后使用的扩展ListView控件,代码如下:
XListView:
- /**
- * @file XListView.java
- * @package me.maxwin.view
- * @create Mar 18, 2012 6:28:41 PM
- * @author Maxwin
- * @description An ListView support (a) Pull down to refresh, (b) Pull up to load more.
- * Implement IXListViewListener, and see stopRefresh() / stopLoadMore().
- */
- package com.home.view;
- import android.content.Context;
- import android.util.AttributeSet;
- import android.view.MotionEvent;
- import android.view.View;
- import android.view.ViewTreeObserver.OnGlobalLayoutListener;
- import android.view.animation.DecelerateInterpolator;
- import android.widget.AbsListView;
- import android.widget.AbsListView.OnScrollListener;
- import android.widget.ListAdapter;
- import android.widget.ListView;
- import android.widget.RelativeLayout;
- import android.widget.Scroller;
- import android.widget.TextView;
- public class XListView extends ListView implements OnScrollListener {
- private float mLastY = -1; // save event y
- private Scroller mScroller; // used for scroll back
- private OnScrollListener mScrollListener; // user's scroll listener
- // the interface to trigger refresh and load more.
- private IXListViewListener mListViewListener;
- // -- header view
- private XListViewHeader mHeaderView;
- // header view content, use it to calculate the Header's height. And hide it
- // when disable pull refresh.
- private RelativeLayout mHeaderViewContent;
- private TextView mHeaderTimeView;
- private int mHeaderViewHeight; // header view's height
- private boolean mEnablePullRefresh = true;
- private boolean mPullRefreshing = false; // is refreashing.
- // -- footer view
- private XListViewFooter mFooterView;
- private boolean mEnablePullLoad;
- private boolean mPullLoading;
- private boolean mIsFooterReady = false;
- // total list items, used to detect is at the bottom of listview.
- private int mTotalItemCount;
- // for mScroller, scroll back from header or footer.
- private int mScrollBack;
- private final static int SCROLLBACK_HEADER = 0;
- private final static int SCROLLBACK_FOOTER = 1;
- private final static int SCROLL_DURATION = 400; // scroll back duration
- private final static int PULL_LOAD_MORE_DELTA = 50; // when pull up >= 50px
- // at bottom, trigger
- // load more.
- private final static float OFFSET_RADIO = 1.8f; // support iOS like pull
- // feature.
- /**
- * @param context
- */
- public XListView(Context context) {
- super(context);
- initWithContext(context);
- }
- public XListView(Context context, AttributeSet attrs) {
- super(context, attrs);
- initWithContext(context);
- }
- public XListView(Context context, AttributeSet attrs, int defStyle) {
- super(context, attrs, defStyle);
- initWithContext(context);
- }
- private void initWithContext(Context context) {
- mScroller = new Scroller(context, new DecelerateInterpolator());
- // XListView need the scroll event, and it will dispatch the event to
- // user's listener (as a proxy).
- super.setOnScrollListener(this);
- // init header view
- mHeaderView = new XListViewHeader(context);
- mHeaderViewContent = (RelativeLayout) mHeaderView
- .findViewById(XListViewHeader.RELAYOUT_ID);
- mHeaderTimeView = (TextView) mHeaderView
- .findViewById(XListViewHeader.HEAD_TIME_VIEW_ID);
- addHeaderView(mHeaderView);
- // init footer view
- mFooterView = new XListViewFooter(context);
- // init header height
- mHeaderView.getViewTreeObserver().addOnGlobalLayoutListener(
- new OnGlobalLayoutListener() {
- @Override
- public void onGlobalLayout() {
- mHeaderViewHeight = mHeaderViewContent.getHeight();
- getViewTreeObserver()
- .removeGlobalOnLayoutListener(this);
- }
- });
- }
- @Override
- public void setAdapter(ListAdapter adapter) {
- // make sure XListViewFooter is the last footer view, and only add once.
- if (mIsFooterReady == false) {
- mIsFooterReady = true;
- addFooterView(mFooterView);
- }
- super.setAdapter(adapter);
- }
- /**
- * enable or disable pull down refresh feature.
- *
- * @param enable
- */
- public void setPullRefreshEnable(boolean enable) {
- mEnablePullRefresh = enable;
- if (!mEnablePullRefresh) { // disable, hide the content
- mHeaderViewContent.setVisibility(View.INVISIBLE);
- } else {
- mHeaderViewContent.setVisibility(View.VISIBLE);
- }
- }
- /**
- * enable or disable pull up load more feature.
- *
- * @param enable
- */
- public void setPullLoadEnable(boolean enable) {
- mEnablePullLoad = enable;
- if (!mEnablePullLoad) {
- mFooterView.hide();
- mFooterView.setOnClickListener(null);
- } else {
- mPullLoading = false;
- mFooterView.show();
- mFooterView.setState(XListViewFooter.STATE_NORMAL);
- // both "pull up" and "click" will invoke load more.
- mFooterView.setOnClickListener(new OnClickListener() {
- @Override
- public void onClick(View v) {
- startLoadMore();
- }
- });
- }
- }
- /**
- * stop refresh, reset header view.
- */
- public void stopRefresh() {
- if (mPullRefreshing == true) {
- mPullRefreshing = false;
- resetHeaderHeight();
- }
- }
- /**
- * stop load more, reset footer view.
- */
- public void stopLoadMore() {
- if (mPullLoading == true) {
- mPullLoading = false;
- mFooterView.setState(XListViewFooter.STATE_NORMAL);
- }
- }
- /**
- * set last refresh time
- *
- * @param time
- */
- public void setRefreshTime(String time) {
- mHeaderTimeView.setText(time);
- }
- private void invokeOnScrolling() {
- if (mScrollListener instanceof OnXScrollListener) {
- OnXScrollListener l = (OnXScrollListener) mScrollListener;
- l.onXScrolling(this);
- }
- }
- private void updateHeaderHeight(float delta) {
- mHeaderView.setVisiableHeight((int) delta
- + mHeaderView.getVisiableHeight());
- if (mEnablePullRefresh && !mPullRefreshing) { // 未处于刷新状态,更新箭头
- if (mHeaderView.getVisiableHeight() > mHeaderViewHeight) {
- mHeaderView.setState(XListViewHeader.STATE_READY);
- } else {
- mHeaderView.setState(XListViewHeader.STATE_NORMAL);
- }
- }
- setSelection(0); // scroll to top each time
- }
- /**
- * reset header view's height.
- */
- private void resetHeaderHeight() {
- int height = mHeaderView.getVisiableHeight();
- if (height == 0) // not visible.
- return;
- // refreshing and header isn't shown fully. do nothing.
- if (mPullRefreshing && height <= mHeaderViewHeight) {
- return;
- }
- int finalHeight = 0; // default: scroll back to dismiss header.
- // is refreshing, just scroll back to show all the header.
- if (mPullRefreshing && height > mHeaderViewHeight) {
- finalHeight = mHeaderViewHeight;
- }
- mScrollBack = SCROLLBACK_HEADER;
- mScroller.startScroll(0, height, 0, finalHeight - height,
- SCROLL_DURATION);
- // trigger computeScroll
- invalidate();
- }
- private void updateFooterHeight(float delta) {
- int height = mFooterView.getBottomMargin() + (int) delta;
- if (mEnablePullLoad && !mPullLoading) {
- if (height > PULL_LOAD_MORE_DELTA) { // height enough to invoke load
- // more.
- mFooterView.setState(XListViewFooter.STATE_READY);
- } else {
- mFooterView.setState(XListViewFooter.STATE_NORMAL);
- }
- }
- mFooterView.setBottomMargin(height);
- // setSelection(mTotalItemCount - 1); // scroll to bottom
- }
- private void resetFooterHeight() {
- int bottomMargin = mFooterView.getBottomMargin();
- if (bottomMargin > 0) {
- mScrollBack = SCROLLBACK_FOOTER;
- mScroller.startScroll(0, bottomMargin, 0, -bottomMargin,
- SCROLL_DURATION);
- invalidate();
- }
- }
- private void startLoadMore() {
- mPullLoading = true;
- mFooterView.setState(XListViewFooter.STATE_LOADING);
- if (mListViewListener != null) {
- mListViewListener.onLoadMore();
- }
- }
- @Override
- public boolean onTouchEvent(MotionEvent ev) {
- if (mLastY == -1) {
- mLastY = ev.getRawY();
- }
- switch (ev.getAction()) {
- case MotionEvent.ACTION_DOWN:
- mLastY = ev.getRawY();
- break;
- case MotionEvent.ACTION_MOVE:
- final float deltaY = ev.getRawY() - mLastY;
- mLastY = ev.getRawY();
- System.out.println("数据监测:" + getFirstVisiblePosition() + "---->"
- + getLastVisiblePosition());
- if (getFirstVisiblePosition() == 0
- && (mHeaderView.getVisiableHeight() > 0 || deltaY > 0)) {
- // the first item is showing, header has shown or pull down.
- updateHeaderHeight(deltaY / OFFSET_RADIO);
- invokeOnScrolling();
- } else if (getLastVisiblePosition() == mTotalItemCount - 1
- && (mFooterView.getBottomMargin() > 0 || deltaY < 0)) {
- // last item, already pulled up or want to pull up.
- updateFooterHeight(-deltaY / OFFSET_RADIO);
- }
- break;
- default:
- mLastY = -1; // reset
- if (getFirstVisiblePosition() == 0) {
- // invoke refresh
- if (mEnablePullRefresh
- && mHeaderView.getVisiableHeight() > mHeaderViewHeight) {
- mPullRefreshing = true;
- mHeaderView.setState(XListViewHeader.STATE_REFRESHING);
- if (mListViewListener != null) {
- mListViewListener.onRefresh();
- }
- }
- resetHeaderHeight();
- }
- if (getLastVisiblePosition() == mTotalItemCount - 1) {
- // invoke load more.
- if (mEnablePullLoad
- && mFooterView.getBottomMargin() > PULL_LOAD_MORE_DELTA) {
- startLoadMore();
- }
- resetFooterHeight();
- }
- break;
- }
- return super.onTouchEvent(ev);
- }
- @Override
- public void computeScroll() {
- if (mScroller.computeScrollOffset()) {
- if (mScrollBack == SCROLLBACK_HEADER) {
- mHeaderView.setVisiableHeight(mScroller.getCurrY());
- } else {
- mFooterView.setBottomMargin(mScroller.getCurrY());
- }
- postInvalidate();
- invokeOnScrolling();
- }
- super.computeScroll();
- }
- @Override
- public void setOnScrollListener(OnScrollListener l) {
- mScrollListener = l;
- }
- @Override
- public void onScrollStateChanged(AbsListView view, int scrollState) {
- if (mScrollListener != null) {
- mScrollListener.onScrollStateChanged(view, scrollState);
- }
- }
- @Override
- public void onScroll(AbsListView view, int firstVisibleItem,
- int visibleItemCount, int totalItemCount) {
- // send to user's listener
- mTotalItemCount = totalItemCount;
- if (mScrollListener != null) {
- mScrollListener.onScroll(view, firstVisibleItem, visibleItemCount,
- totalItemCount);
- }
- }
- public void setXListViewListener(IXListViewListener l) {
- mListViewListener = l;
- }
- /**
- * you can listen ListView.OnScrollListener or this one. it will invoke
- * onXScrolling when header/footer scroll back.
- */
- public interface OnXScrollListener extends OnScrollListener {
- public void onXScrolling(View view);
- }
- /**
- * implements this interface to get refresh/load more event.
- */
- public interface IXListViewListener {
- public void onRefresh();
- public void onLoadMore();
- }
- }
XListViewFooter:
- package com.home.view;
- import android.content.Context;
- import android.util.AttributeSet;
- import android.view.Gravity;
- import android.view.View;
- import android.widget.LinearLayout;
- import android.widget.ProgressBar;
- import android.widget.RelativeLayout;
- import android.widget.TextView;
- public class XListViewFooter extends LinearLayout {
- public final static int STATE_NORMAL = 0;
- public final static int STATE_READY = 1;
- public final static int STATE_LOADING = 2;
- private Context mContext;
- private RelativeLayout mContentView;
- private ProgressBar mProgressBar;
- private TextView mHintView;
- public XListViewFooter(Context context) {
- super(context);
- initView(context);
- }
- public XListViewFooter(Context context, AttributeSet attrs) {
- super(context, attrs);
- initView(context);
- }
- public void setState(int state) {
- mHintView.setVisibility(View.INVISIBLE);
- mProgressBar.setVisibility(View.INVISIBLE);
- mHintView.setVisibility(View.INVISIBLE);
- if (state == STATE_READY) {
- mHintView.setVisibility(View.VISIBLE);
- mHintView.setText("松开载入更多");
- } else if (state == STATE_LOADING) {
- mProgressBar.setVisibility(View.VISIBLE);
- } else {
- mHintView.setVisibility(View.VISIBLE);
- mHintView.setText("查看更多");
- }
- }
- public void setBottomMargin(int height) {
- if (height < 0)
- return;
- LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) mContentView
- .getLayoutParams();
- lp.bottomMargin = height;
- mContentView.setLayoutParams(lp);
- }
- public int getBottomMargin() {
- LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) mContentView
- .getLayoutParams();
- return lp.bottomMargin;
- }
- /**
- * normal status
- */
- public void normal() {
- mHintView.setVisibility(View.VISIBLE);
- mProgressBar.setVisibility(View.GONE);
- }
- /**
- * loading status
- */
- public void loading() {
- mHintView.setVisibility(View.GONE);
- mProgressBar.setVisibility(View.VISIBLE);
- }
- /**
- * hide footer when disable pull load more
- */
- public void hide() {
- LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) mContentView
- .getLayoutParams();
- lp.height = 0;
- mContentView.setLayoutParams(lp);
- }
- /**
- * show footer
- */
- public void show() {
- LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) mContentView
- .getLayoutParams();
- lp.height = LayoutParams.WRAP_CONTENT;
- mContentView.setLayoutParams(lp);
- }
- private void initView(Context context) {
- mContext = context;
- // 根布局
- LinearLayout moreView = new LinearLayout(mContext);
- moreView.setLayoutParams(new LinearLayout.LayoutParams(
- LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
- // 将根布局加到该LinearLayout中
- addView(moreView);
- // 根布局里面的相对布局
- mContentView = new RelativeLayout(mContext);
- LinearLayout.LayoutParams linearLp1 = new LinearLayout.LayoutParams(
- LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
- mContentView.setPadding(10, 10, 10, 10);
- // 将相对布局relayout加到moreView根布局中
- moreView.addView(mContentView, linearLp1);
- // 进度条mProgressBar
- mProgressBar = new ProgressBar(mContext);
- RelativeLayout.LayoutParams relativeLp1 = new RelativeLayout.LayoutParams(
- LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
- relativeLp1.addRule(RelativeLayout.CENTER_IN_PARENT);
- mProgressBar.setVisibility(View.INVISIBLE);
- // 将mProgressBar加入相对布局relayout中
- mContentView.addView(mProgressBar, relativeLp1);
- // 查看更多的TextView
- mHintView = new TextView(mContext);
- mHintView.setText("查看更多");
- mHintView.setGravity(Gravity.CENTER);
- RelativeLayout.LayoutParams relativeLp2 = new RelativeLayout.LayoutParams(
- LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
- relativeLp2.addRule(RelativeLayout.CENTER_IN_PARENT);
- // 将其加入相对布局relayout中
- mContentView.addView(mHintView, relativeLp2);
- }
- }
XListViewHeader:
- package com.home.view;
- import java.io.IOException;
- import java.io.InputStream;
- import android.content.Context;
- import android.content.res.AssetManager;
- import android.graphics.Bitmap;
- import android.graphics.BitmapFactory;
- import android.util.AttributeSet;
- import android.view.Gravity;
- import android.view.View;
- import android.view.ViewGroup;
- import android.view.animation.Animation;
- import android.view.animation.RotateAnimation;
- import android.widget.ImageView;
- import android.widget.LinearLayout;
- import android.widget.ProgressBar;
- import android.widget.RelativeLayout;
- import android.widget.TextView;
- public class XListViewHeader extends LinearLayout {
- private LinearLayout mContainer;
- private ImageView mArrowImageView;
- private ProgressBar mProgressBar;
- private TextView mHintTextView;
- private int mState = STATE_NORMAL;
- private Animation mRotateUpAnim;
- private Animation mRotateDownAnim;
- private final int ROTATE_ANIM_DURATION = 180;
- public final static int STATE_NORMAL = 0;
- public final static int STATE_READY = 1;
- public final static int STATE_REFRESHING = 2;
- public static final int LINEAROUT_1_ID = 1;
- public static final int RELAYOUT_ID = 2;
- public static final int HEAD_TIME_VIEW_ID = 3;
- public XListViewHeader(Context context) {
- super(context);
- initView(context);
- }
- /**
- * @param context
- * @param attrs
- */
- public XListViewHeader(Context context, AttributeSet attrs) {
- super(context, attrs);
- initView(context);
- }
- private void initView(Context context) {
- // 根布局
- mContainer = new LinearLayout(context);
- mContainer.setGravity(Gravity.BOTTOM);
- // 初始情况,设置下拉刷新view高度为0
- LinearLayout.LayoutParams linearLp1 = new LinearLayout.LayoutParams(
- LayoutParams.MATCH_PARENT, 0);
- // 将根布局加入该LinearLayout中
- addView(mContainer, linearLp1);
- setGravity(Gravity.BOTTOM);
- // 里面的相对布局
- RelativeLayout relayout = new RelativeLayout(context);
- relayout.setId(RELAYOUT_ID);
- LinearLayout.LayoutParams linearLp2 = new LinearLayout.LayoutParams(
- LayoutParams.MATCH_PARENT, 60);
- // 将里面的相对布局加入根布局中
- mContainer.addView(relayout, linearLp2);
- // 相对布局里的子线性布局1
- LinearLayout linear1 = new LinearLayout(context);
- linear1.setId(LINEAROUT_1_ID);
- RelativeLayout.LayoutParams relativeLp1 = new RelativeLayout.LayoutParams(
- LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
- relativeLp1.addRule(RelativeLayout.CENTER_IN_PARENT);
- linear1.setGravity(Gravity.CENTER);
- linear1.setOrientation(LinearLayout.VERTICAL);
- // 将子布局linear1加入relayout中
- relayout.addView(linear1, relativeLp1);
- // 下拉刷新提示TextView
- mHintTextView = new TextView(context);
- mHintTextView.setText("下拉刷新");
- LinearLayout.LayoutParams linearLp3 = new LinearLayout.LayoutParams(
- LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
- // 将TextView加入linear1中
- linear1.addView(mHintTextView, linearLp3);
- // 子线性布局1(linear1)里的线性布局linear12
- LinearLayout linear12 = new LinearLayout(context);
- LinearLayout.LayoutParams linearLp4 = new LinearLayout.LayoutParams(
- LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
- linearLp4.setMargins(0, 3, 0, 0);
- // 将linear12加入linear1中
- linear1.addView(linear12, linearLp4);
- // 提示时间TextView
- TextView tv = new TextView(context);
- tv.setText("上次更新时间:");
- tv.setTextSize(12);
- // 将提示时间TextView加入linear12
- linear12.addView(tv, linearLp3);
- // 时间值TextView
- TextView tv2 = new TextView(context);
- tv2.setId(HEAD_TIME_VIEW_ID);
- tv2.setTextSize(12);
- // 将时间值TextView加入linear12
- linear12.addView(tv2, linearLp3);
- // ImageView
- mArrowImageView = new ImageView(context);
- RelativeLayout.LayoutParams relativeLp2 = new RelativeLayout.LayoutParams(
- ViewGroup.LayoutParams.WRAP_CONTENT,
- ViewGroup.LayoutParams.WRAP_CONTENT);
- relativeLp2.rightMargin = 20;
- relativeLp2.addRule(RelativeLayout.CENTER_VERTICAL);
- relativeLp2.addRule(RelativeLayout.LEFT_OF, LINEAROUT_1_ID);
- mArrowImageView.setImageBitmap(readAssetImage(context));
- // 将ImageView加到相对布局relayout中
- relayout.addView(mArrowImageView, relativeLp2);
- // ProgressBar
- mProgressBar = new ProgressBar(context);
- RelativeLayout.LayoutParams relativeLp3 = new RelativeLayout.LayoutParams(
- 45, 45);
- relativeLp3.addRule(RelativeLayout.LEFT_OF, LINEAROUT_1_ID);
- relativeLp3.addRule(RelativeLayout.CENTER_VERTICAL);
- relativeLp3.rightMargin = 20;
- mProgressBar.setVisibility(View.INVISIBLE);
- // 将mProgressBar加到相对布局relayout中
- relayout.addView(mProgressBar, relativeLp3);
- mRotateUpAnim = new RotateAnimation(0.0f, -180.0f,
- Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
- 0.5f);
- mRotateUpAnim.setDuration(ROTATE_ANIM_DURATION);
- mRotateUpAnim.setFillAfter(true);
- mRotateDownAnim = new RotateAnimation(-180.0f, 0.0f,
- Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
- 0.5f);
- mRotateDownAnim.setDuration(ROTATE_ANIM_DURATION);
- mRotateDownAnim.setFillAfter(true);
- }
- public void setState(int state) {
- if (state == mState)
- return;
- if (state == STATE_REFRESHING) { // 显示进度
- mArrowImageView.clearAnimation();
- mArrowImageView.setVisibility(View.INVISIBLE);
- mProgressBar.setVisibility(View.VISIBLE);
- } else { // 显示箭头图片
- mArrowImageView.setVisibility(View.VISIBLE);
- mProgressBar.setVisibility(View.INVISIBLE);
- }
- switch (state) {
- case STATE_NORMAL:
- if (mState == STATE_READY) {
- mArrowImageView.startAnimation(mRotateDownAnim);
- }
- if (mState == STATE_REFRESHING) {
- mArrowImageView.clearAnimation();
- }
- mHintTextView.setText("下拉刷新");
- break;
- case STATE_READY:
- if (mState != STATE_READY) {
- mArrowImageView.clearAnimation();
- mArrowImageView.startAnimation(mRotateUpAnim);
- mHintTextView.setText("松开刷新数据");
- }
- break;
- case STATE_REFRESHING:
- mHintTextView.setText("正在加载...");
- break;
- default:
- }
- mState = state;
- }
- public void setVisiableHeight(int height) {
- if (height < 0)
- height = 0;
- LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) mContainer
- .getLayoutParams();
- lp.height = height;
- mContainer.setLayoutParams(lp);
- }
- public int getVisiableHeight() {
- return mContainer.getHeight();
- }
- /**
- * 读取assets里面文件名为xlistview_arrow.png的图片
- *
- * @param context
- * @return bitmap
- */
- private Bitmap readAssetImage(Context context) {
- AssetManager asset = context.getAssets();
- InputStream assetFile = null;
- Bitmap bitmap = null;
- try {
- assetFile = asset.open("xlistview_arrow.png");
- bitmap = BitmapFactory.decodeStream(assetFile);
- } catch (IOException e) {
- e.printStackTrace();
- }
- return bitmap;
- }
- }
然后将使用到的那张图片放在assets目录下和src一起打包即可。
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