Android程序开发之ListView 与PopupWindow实现从左向右滑动删除功能

概述文章实现的功能是:在ListView的Item上从右向左滑时，出现删除按钮，点击删除按钮把Item删除。

文章实现的功能是:在ListVIEw的Item上从右向左滑时，出现删除按钮，点击删除按钮把Item删除。@H_419_1@

看过文章后，感觉没有必要把dispatchtouchEvent()和ontouchEvent()两个方法都重写，只要重写ontouchEvent就好了。于是对代码作了一些调整：@H_419_1@

public class MyListVIEw extends ListVIEw {private static final String TAG = "MyListVIEw";private int mtouchSlop;private int mXDown;private int mYDown;private int mCurrentposition;private VIEw mCurrentVIEw;private PopupWindow mPopupWindow;private LayoutInflater mInflater;private boolean isSlIDing = false;// 为删除按钮提供一个回调接口private DelbuttonClickListener mListener;private button mDelBtn;private int mPopupWindowHeight;private int mPopupWindowWIDth;public MyListVIEw(Context context,AttributeSet attrs) {super(context,attrs);mInflater = LayoutInflater.from(context);mtouchSlop = VIEwConfiguration.get(context).getScaledtouchSlop();VIEw vIEw = mInflater.inflate(R.layout.delete_btn,null);mDelBtn = (button) vIEw.findVIEwByID(R.ID.ID_item_btn);mPopupWindow = new PopupWindow(vIEw,linearLayout.LayoutParams.WRAP_CONTENT,linearLayout.LayoutParams.WRAP_CONTENT);// 如果需要通过点击PopupWindow之外的地方使其消失，则需要setFocusable(true).mPopupWindow.setFocusable(true);// AndroID 6.0以前的版本需要setBackgroundDrawable()，// 才能实现通过点击PopupWindow之外的地方使其消失的功能。mPopupWindow.setBackgroundDrawable(new colorDrawable(0));// 先调用下measure，否则拿不到宽和高mPopupWindow.getContentVIEw().measure(0,0);mPopupWindowHeight = mPopupWindow.getContentVIEw().getMeasuredHeight();mPopupWindowWIDth = mPopupWindow.getContentVIEw().getMeasureDWIDth();}@OverrIDepublic boolean ontouchEvent(MotionEvent ev) {int action = ev.getAction();int x = (int) ev.getX();int y = (int) ev.getY();switch (action){case MotionEvent.ACTION_DOWN:isSlIDing = false;mXDown = x;mYDown = y;mCurrentposition = pointToposition(mXDown,mYDown);VIEw vIEw = getChildAt(mCurrentposition - getFirstVisibleposition());mCurrentVIEw = vIEw;break;case MotionEvent.ACTION_MOVE:int dx = x - mXDown;int dy = y - mYDown;Log.d(TAG,"mtouchSlop = " + mtouchSlop + ",dx = " + dx + ",dy = " + dy);if(mXDown > x && Math.abs(dx) > mtouchSlop && Math.abs(dy) < mtouchSlop){Log.d(TAG,"isSlIDing");isSlIDing = true;int[] location = new int[2];mCurrentVIEw.getLocationOnScreen(location);mPopupWindow.setAnimationStyle(R.style.popwindow_delete_btn_anim_style);mPopupWindow.update();Log.d(TAG,"Height: " + mCurrentVIEw.getHeight() + "," + mPopupWindow.getHeight());mPopupWindow.showAtLocation(mCurrentVIEw,Gravity.NO_GraviTY,location[0] + mCurrentVIEw.getWIDth(),location[1] + mCurrentVIEw.getHeight() / 2 - mPopupWindowHeight / 2);mDelBtn.setonClickListener(new OnClickListener() {@OverrIDepublic voID onClick(VIEw v) {mListener.clickHappend(mCurrentposition);mPopupWindow.dismiss();}});}case MotionEvent.ACTION_UP:// isSlIDing 如果这里恢复为false,则后面会执行super.ontouchEvent事件，// 而AbsListVIEw的ontouchEvent调用了ontouchUp方法，在ontouchUp方法中有可能执行// performClick.run() --> performItemClick() --> super.performItemClick// --> mOnItemClickListener.onItemClick，这样最终触发Item的点击。// 因此此处依旧保持isSlIDing为true的状态，而在ACTION_DOWN事件中恢复isSlIDing为false，// 毕竟每个事件都以ACTION_DOWN开始。//isSlIDing = false;}if(isSlIDing){return true;}return super.ontouchEvent(ev);}public voID setDelbuttonClickListener(DelbuttonClickListener Listener){mListener = Listener;}interface DelbuttonClickListener{public voID clickHappend(int position);}}

通过这个例子学习到：@H_419_1@

1、ListVIEw的Item点击事件的触发过程：@H_419_1@

自定义ListVIEw的ontouchEvent() ---调用super.ontouchEvent()---> AbsListVIEw.ontouchEvent() ---MotionEvent.ACTION_UP---> AbsListVIEw.ontouchUp()@H_419_1@

---(有可能)调用performClick.run()---> AbsListVIEw.PerformClick.run() ---调用performItemClick()---> AbsListVIEw.performItemClick()

---(有可能)调用super.performItemClick()---> AdapterVIEw.performItemClick() ---mOnItemClickListener.onItemClick---> OnItemClickListener.onItemClick()@H_419_1@

也就是Item的点击事件是在MotionEvent.ACTION_UP事件完成的，这样在自定义ListVIEw的ontouchEvent()中，对MotionEvent.ACTION_UP直接return true消费掉事件，而不要调用super.ontouchEvent。这样就避免了删除按钮与Item点击事件的冲突。@H_419_1@

2、PopupWindow--通过点击PopupWindow之外的地方使其消失@H_419_1@

a、需要调用setFocusable()方法；@H_419_1@

b、AndroID 6.0以前的版本需要setBackgroundDrawable()（具体原因见：PopupWindow的使用）。@H_419_1@

以上所述是小编给大家介绍的AndroID程序开发之ListVIEw 与PopupWindow实现滑动删除功能，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对编程小技巧网站的支持！

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