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   源码介绍

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android仿QQ消息列表滑动删除源代码

package cn.sunzn.scview;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.ScaleAnimation;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Scroller;
public class SlideCutListView extends ListView {
 private int slidePosition, preSlidePosition;
 private int downY;
 private int downX;
 public static View itemView, preItemView;
 private Scroller scroller;
 private static final int SNAP_VELOCITY = 600;
 private VelocityTracker velocityTracker;
 public static boolean isSlide = false;
 private boolean isResponse = true;
 public static boolean isObstruct = true;
 private int mTouchSlop;
 private RemoveListener mRemoveListener;
 private static Animation scaleHideAnimation;
 private static Animation scaleShowAnimation;
 public SlideCutListView(Context context) {
  this(context, null);
 }
 public SlideCutListView(Context context, AttributeSet attrs) {
  this(context, attrs, 0);
 }
 public SlideCutListView(Context context, AttributeSet attrs, int defStyle) {
  super(context, attrs, defStyle);
  scroller = new Scroller(context);
  mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();
 }
 public void setRemoveListener(RemoveListener removeListener) {
  this.mRemoveListener = removeListener;
 }
 public boolean dispatchTouchEvent(MotionEvent event) {
  switch (event.getAction()) {
  case MotionEvent.ACTION_DOWN: {
   Log.e("sunzn", "dispatchTouchEvent ACTION_DOWN isSlide = " isSlide);
   addVelocityTracker(event);
   downX = (int) event.getX();
   downY = (int) event.getY();
   slidePosition = pointToPosition(downX, downY);
   if (slidePosition == AdapterView.INVALID_POSITION) {
    return super.dispatchTouchEvent(event);
   }
   if (preItemView != null && preItemView.findViewById(R.id.tv_coating).getVisibility() == View.GONE) {
    itemView = preItemView;
    slidePosition = preSlidePosition;
   } else {
    itemView = getChildAt(slidePosition - getFirstVisiblePosition());
    preItemView = itemView;
    preSlidePosition = slidePosition;
   }
   break;
  }
  case MotionEvent.ACTION_MOVE: {
   if (Math.abs(getScrollVelocity()) > SNAP_VELOCITY || (Math.abs(event.getX() - downX) > mTouchSlop && Math.abs(event.getY() - downY) < mTouchSlop)) {
    isSlide = true;
   }
   break;
  }
  case MotionEvent.ACTION_UP:
   recycleVelocityTracker();
   isObstruct = true;
   break;
  }
  return super.dispatchTouchEvent(event);
 }
 public boolean onInterceptTouchEvent(MotionEvent ev) {
  switch (ev.getAction()) {
  case MotionEvent.ACTION_MOVE:
   if (itemView.findViewById(R.id.tv_coating).getVisibility() == View.VISIBLE) {
    isSlide = false;
   } else {
    isSlide = true;
   }
   break;
  default:
   break;
  }
  return super.onInterceptTouchEvent(ev);
 }
 public boolean onTouchEvent(MotionEvent ev) {
  if (isSlide && slidePosition != AdapterView.INVALID_POSITION) {
   addVelocityTracker(ev);
   final int action = ev.getAction();
   switch (action) {
   case MotionEvent.ACTION_MOVE:
    Log.e("sunzn", "onTouchEvent ACTION_MOVE isSlide = " isSlide);
    if (isObstruct) {
     if (itemView.findViewById(R.id.tv_coating).getVisibility() == View.VISIBLE && isResponse == true) {
      scaleHideAnimation = new ScaleAnimation(1.0f, 0.0f, 1.0f, 1.0f);
      scaleHideAnimation.setDuration(250);
      scaleHideAnimation.setAnimationListener(new AnimationListener() {
       public void onAnimationStart(Animation animation) {
        isResponse = false;
        isObstruct = false;
       }
       public void onAnimationRepeat(Animation animation) {
       }
       public void onAnimationEnd(Animation animation) {
        isResponse = true;
        itemView.findViewById(R.id.tv_coating).setVisibility(View.GONE);
        itemView.findViewById(R.id.tv_functions).setClickable(true);
        itemView.findViewById(R.id.tv_functions).setOnClickListener(new OnClickListener() {
         public void onClick(View v) {
          mRemoveListener.removeItem(slidePosition);
         }
        });
       }
      });
      itemView.findViewById(R.id.tv_coating).startAnimation(scaleHideAnimation);
     } else if (itemView.findViewById(R.id.tv_coating).getVisibility() == View.GONE && isResponse == true) {
      scaleShowAnimation = new ScaleAnimation(0.0f, 1.0f, 1.0f, 1.0f);
      scaleShowAnimation.setDuration(250);
      scaleShowAnimation.setAnimationListener(new AnimationListener() {
       public void onAnimationStart(Animation animation) {
        isResponse = false;
        isObstruct = false;
       }
       public void onAnimationRepeat(Animation animation) {
       }
       public void onAnimationEnd(Animation animation) {
        isSlide = false;
        isResponse = true;
        itemView.findViewById(R.id.tv_coating).setVisibility(View.VISIBLE);
       }
      });
      itemView.findViewById(R.id.tv_coating).startAnimation(scaleShowAnimation);
     }
    }
    break;
   case MotionEvent.ACTION_UP:
    isObstruct = true;
    recycleVelocityTracker();
    isSlide = true;
    break;
   }
   return true;
  }
  return super.onTouchEvent(ev);
 }
 public void computeScroll() {
  if (scroller.computeScrollOffset()) {
   postInvalidate();
   if (scroller.isFinished()) {
    if (mRemoveListener == null) {
     throw new NullPointerException("RemoveListener is null, we should called setRemoveListener()");
    }
    itemView.scrollTo(0, 0);
   }
  }
 }
 private void addVelocityTracker(MotionEvent event) {
  if (velocityTracker == null) {
   velocityTracker = VelocityTracker.obtain();
  }
  velocityTracker.addMovement(event);
 }
 private void recycleVelocityTracker() {
  if (velocityTracker != null) {
   velocityTracker.recycle();
   velocityTracker = null;
  }
 }
 private int getScrollVelocity() {
  velocityTracker.computeCurrentVelocity(1000);
  int velocity = (int) velocityTracker.getXVelocity();
  return velocity;
 }
 public interface RemoveListener {
  public void removeItem(int position);
 }
}