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(); }