Android仿QQ左滑删除置顶ListView操作

import android.content.Context;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.MotionEvent;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.LinearLayout;
import android.widget.ListView;

/**
 * Created by MooreLi on 2016/8/8.
 */
public class SlideListView extends ListView {
 private String TAG = getClass().getSimpleName();

 private int mScreenWidth;
 private int mDownX;
 private int mDownY;
 private int mMenuWidth;

 private boolean isMenuShow;
 private boolean isMoving;

 private int mOperatePosition = -1;
 private ViewGroup mPointChild;
 private LinearLayout.LayoutParams mLayoutParams;

 public SlideListView(Context context) {
  super(context);
  getScreenWidth(context);
 }

 public SlideListView(Context context, AttributeSet attrs) {
  super(context, attrs);
  getScreenWidth(context);
 }

 public SlideListView(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  getScreenWidth(context);
 }

 private void getScreenWidth(Context context) {
  WindowManager manager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
  DisplayMetrics dm = new DisplayMetrics();
  manager.getDefaultDisplay().getMetrics(dm);
  mScreenWidth = dm.widthPixels;
 }

 @Override
 public boolean onTouchEvent(MotionEvent ev) {
  switch (ev.getAction()) {
   case MotionEvent.ACTION_DOWN:
    performActionDown(ev);
    break;
   case MotionEvent.ACTION_MOVE:
    performActionMove(ev);
    break;
   case MotionEvent.ACTION_UP:
    performActionUp();
    break;
  }
  return super.onTouchEvent(ev);
 }

 private void performActionDown(MotionEvent ev) {
  mDownX = (int) ev.getX();
  mDownY = (int) ev.getY();
  //如果点击的不是同一个item，则关掉正在显示的菜单
  int position = pointToPosition(mDownX, mDownY);
  if (isMenuShow && position != mOperatePosition) {
   turnToNormal();
  }
  mOperatePosition = position;
  mPointChild = (ViewGroup) getChildAt(position - getFirstVisiblePosition());
  if (mPointChild != null) {
   mMenuWidth = mPointChild.getChildAt(1).getLayoutParams().width;
   mLayoutParams = (LinearLayout.LayoutParams) mPointChild.getChildAt(0).getLayoutParams();
   mLayoutParams.width = mScreenWidth;
   setChildLayoutParams();
  }
 }

 private boolean performActionMove(MotionEvent ev) {
  int nowX = (int) ev.getX();
  int nowY = (int) ev.getY();
//  if (isMoving) {
//   if (Math.abs(nowY - mDownY) > 0) {
//    Log.e(TAG, "kkkkkkk");
//    onInterceptTouchEvent(ev);
//   }
//  }
  if (Math.abs(nowX - mDownX) > 0) {
   //左滑 显示菜单
   if (nowX = mMenuWidth) {
      scroll = -mMenuWidth;
     }
     mLayoutParams.leftMargin = scroll;
    }
   }
   //右滑 如果菜单显示状态，则关闭菜单
   if (isMenuShow && nowX > mDownX) {
    int scroll = nowX - mDownX;
    if (scroll >= mMenuWidth) {
     scroll = mMenuWidth;
    }
    mLayoutParams.leftMargin = scroll - mMenuWidth;
   }
   setChildLayoutParams();
   isMoving = true;
   return true;
  }

  return super.onTouchEvent(ev);
 }

 private void performActionUp() {
  //超过一半时，显示菜单，否则隐藏
  if (-mLayoutParams.leftMargin >= mMenuWidth / 2) {
   mLayoutParams.leftMargin = -mMenuWidth;
   setChildLayoutParams();
   isMenuShow = true;
  } else {
   turnToNormal();
  }
  isMoving = false;
 }

 private void setChildLayoutParams(){
  if(mPointChild != null){
   mPointChild.getChildAt(0).setLayoutParams(mLayoutParams);
  }
 }

 /**
  * 正常显示
  */
 public void turnToNormal() {
  mLayoutParams.leftMargin = 0;
  mOperatePosition = -1;
  setChildLayoutParams();
  isMenuShow = false;
 }
}

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  holder.tvTitle.setText(mInfos.get(position));
  holder.tvDelete.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    mInfos.remove(position);
    notifyDataSetChanged();
    mListView.turnToNormal();
   }
  });
  holder.tvTop.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    String temp = mInfos.get(position);
    mInfos.remove(position);
    mInfos.add(0, temp);
    notifyDataSetChanged();
    mListView.turnToNormal();
   }
  });