Android仿微信对话列表滑动删除效果

package com.fxsky.swipelist.widget;import android.annotation.SuppressLint;import android.content.Context;import android.content.res.TypedArray;import android.os.Handler;import android.os.Message;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.widget.ListView;import com.fxsky.swipelist.R;public class SwipeListView extends ListView { private Boolean mIsHorizontal; private View mPreItemView; private View mCurrentItemView; private float mFirstX; private float mFirstY; private int mRightViewWidth; // private boolean mIsInAnimation = false; private final int mDuration = 100; private final int mDurationStep = 10; private boolean mIsShown; public SwipeListView(Context context) { this(context,null); } public SwipeListView(Context context, AttributeSet attrs) { this(context, attrs,0); } public SwipeListView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle);  TypedArray mTypedArray = context.obtainStyledAttributes(attrs,  R.styleable.swipelistviewstyle);   //获取自定义属性和默认值  mRightViewWidth = (int) mTypedArray.getDimension(R.styleable.swipelistviewstyle_right_width, 200);   mTypedArray.recycle();  } /** * return true, deliver to listView. return false, deliver to child. if * move, return true */ @Override public boolean onInterceptTouchEvent(MotionEvent ev) { float lastX = ev.getX(); float lastY = ev.getY(); switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: mIsHorizontal = null; System.out.println("onInterceptTouchEvent----->ACTION_DOWN"); mFirstX = lastX; mFirstY = lastY; int motionPosition = pointToPosition((int)mFirstX, (int)mFirstY); if (motionPosition >= 0) {  View currentItemView = getChildAt(motionPosition - getFirstVisiblePosition());  mPreItemView = mCurrentItemView;  mCurrentItemView = currentItemView; } break; case MotionEvent.ACTION_MOVE: float dx = lastX - mFirstX; float dy = lastY - mFirstY; if (Math.abs(dx) >= 5 && Math.abs(dy) >= 5) {  return true; } break; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: System.out.println("onInterceptTouchEvent----->ACTION_UP"); if (mIsShown && (mPreItemView != mCurrentItemView || isHitCurItemLeft(lastX))) {  System.out.println("1---> hiddenRight");  /**  * 情况一：  * <p>  * 一个Item的右边布局已经显示，  * <p>  * 这时候点击任意一个item, 那么那个右边布局显示的item隐藏其右边布局  */  hiddenRight(mPreItemView); } break; } return super.onInterceptTouchEvent(ev); } private boolean isHitCurItemLeft(float x) { return x < getWidth() - mRightViewWidth; } /** * @param dx * @param dy * @return judge if can judge scroll direction */ private boolean judgeScrollDirection(float dx, float dy) { boolean canJudge = true; if (Math.abs(dx) > 30 && Math.abs(dx) > 2 * Math.abs(dy)) { mIsHorizontal = true; System.out.println("mIsHorizontal---->" + mIsHorizontal); } else if (Math.abs(dy) > 30 && Math.abs(dy) > 2 * Math.abs(dx)) { mIsHorizontal = false; System.out.println("mIsHorizontal---->" + mIsHorizontal); } else { canJudge = false; } return canJudge; } /** * return false, can't move any direction. return true, cant't move * vertical, can move horizontal. return super.onTouchEvent(ev), can move * both. */ @Override public boolean onTouchEvent(MotionEvent ev) { float lastX = ev.getX(); float lastY = ev.getY(); switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: System.out.println("---->ACTION_DOWN"); break; case MotionEvent.ACTION_MOVE: float dx = lastX - mFirstX; float dy = lastY - mFirstY; // confirm is scroll direction if (mIsHorizontal == null) {  if (!judgeScrollDirection(dx, dy)) {  break;  } } if (mIsHorizontal) {  if (mIsShown && mPreItemView != mCurrentItemView) {  System.out.println("2---> hiddenRight");  /**  * 情况二：  * <p>  * 一个Item的右边布局已经显示，  * <p>  * 这时候左右滑动另外一个item,那个右边布局显示的item隐藏其右边布局  * <p>  * 向左滑动只触发该情况，向右滑动还会触发情况五  */  hiddenRight(mPreItemView);  }  if (mIsShown && mPreItemView == mCurrentItemView) {  dx = dx - mRightViewWidth;  System.out.println("======dx " + dx);  }  // can't move beyond boundary  if (dx < 0 && dx > -mRightViewWidth) {  mCurrentItemView.scrollTo((int)(-dx), 0);  }  return true; } else {  if (mIsShown) {  System.out.println("3---> hiddenRight");  /**  * 情况三：  * <p>  * 一个Item的右边布局已经显示，  * <p>  * 这时候上下滚动ListView,那么那个右边布局显示的item隐藏其右边布局  */  hiddenRight(mPreItemView);  } } break; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: System.out.println("============ACTION_UP"); clearPressedState(); if (mIsShown) {  System.out.println("4---> hiddenRight");  /**  * 情况四：  * <p>  * 一个Item的右边布局已经显示，  * <p>  * 这时候左右滑动当前一个item,那个右边布局显示的item隐藏其右边布局  */  hiddenRight(mPreItemView); } if (mIsHorizontal != null && mIsHorizontal) {  if (mFirstX - lastX > mRightViewWidth / 2) {  showRight(mCurrentItemView);  } else {  System.out.println("5---> hiddenRight");  /**  * 情况五：  * <p>  * 向右滑动一个item,且滑动的距离超过了右边View的宽度的一半，隐藏之。  */  hiddenRight(mCurrentItemView);  }  return true; } break; } return super.onTouchEvent(ev); } private void clearPressedState() { // TODO current item is still has background, issue mCurrentItemView.setPressed(false); setPressed(false); refreshDrawableState(); // invalidate(); } private void showRight(View view) { System.out.println("=========showRight"); Message msg = new MoveHandler().obtainMessage(); msg.obj = view; msg.arg1 = view.getScrollX(); msg.arg2 = mRightViewWidth; msg.sendToTarget(); mIsShown = true; } private void hiddenRight(View view) { System.out.println("=========hiddenRight"); if (mCurrentItemView == null) { return; } Message msg = new MoveHandler().obtainMessage();// msg.obj = view; msg.arg1 = view.getScrollX(); msg.arg2 = 0; msg.sendToTarget(); mIsShown = false; } /** * show or hide right layout animation */ @SuppressLint("HandlerLeak") class MoveHandler extends Handler { int stepX = 0; int fromX; int toX; View view; private boolean mIsInAnimation = false; private void animatioOver() { mIsInAnimation = false; stepX = 0; } @Override public void handleMessage(Message msg) { super.handleMessage(msg); if (stepX == 0) { if (mIsInAnimation) {  return; } mIsInAnimation = true; view = (View)msg.obj; fromX = msg.arg1; toX = msg.arg2; stepX = (int)((toX - fromX) * mDurationStep * 1.0 / mDuration); if (stepX < 0 && stepX > -1) {  stepX = -1; } else if (stepX > 0 && stepX < 1) {  stepX = 1; } if (Math.abs(toX - fromX) < 10) {  view.scrollTo(toX, 0);  animatioOver();  return; } } fromX += stepX; boolean isLastStep = (stepX > 0 && fromX > toX) || (stepX < 0 && fromX < toX); if (isLastStep) { fromX = toX; } view.scrollTo(fromX, 0); invalidate(); if (!isLastStep) { this.sendEmptyMessageDelayed(0, mDurationStep); } else { animatioOver(); } } } public int getRightViewWidth() { return mRightViewWidth; } public void setRightViewWidth(int mRightViewWidth) { this.mRightViewWidth = mRightViewWidth; }}

@Override public int getCount() {// return 100; return data.size(); }