android实现简单左滑删除控件

import android.animation.ValueAnimator;import android.content.Context;import android.graphics.PointF;import android.support.v4.view.ViewConfigurationCompat;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.view.ViewConfiguration;import android.view.ViewGroup; public class SwipeLayout extends ViewGroup{ public static String TAG = "SwipeLayout";  //可以滚动的距离 int mSwipeWidth;   PointF firstPoint; PointF lastPoint;  float mTouchSlop;  ValueAnimator openAnimator; ValueAnimator closeAnimator;  public SwipeLayout(Context context) {  this(context,null); }  public SwipeLayout(Context context, AttributeSet attrs) {  super(context, attrs);  mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(ViewConfiguration.get(getContext())); }    @Override protected void onLayout(boolean changed, int l, int t, int r, int b) {  int left=0;  int childCount = getChildCount();   for (int i=0;i<childCount;++i){   View child = getChildAt(i);    //按顺序从左往右排//   if (i==0){//    child.layout(0,0,child.getMeasuredWidth(),child.getMeasuredHeight());//   }else {    child.layout(left,0,left+child.getMeasuredWidth(),child.getMeasuredHeight());//   }   left += child.getMeasuredWidth();  }   }  @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {  super.onMeasure(widthMeasureSpec, heightMeasureSpec);  int childCount = getChildCount();  View mainChild = getChildAt(0);  int width=0;  int height=0;  mSwipeWidth = 0;//  measureChild(mainChild,widthMeasureSpec,heightMeasureSpec);  measure(widthMeasureSpec,heightMeasureSpec);   //滑动距离是 从index开始 所有控件的宽度之和  if (childCount>1) {   for (int i = 1; i < childCount; ++i) {    mSwipeWidth += getChildAt(i).getMeasuredWidth();   }  }    int widthMode = MeasureSpec.getMode(widthMeasureSpec);  int widthValue = MeasureSpec.getSize(widthMeasureSpec);  int heightMode = MeasureSpec.getMode(heightMeasureSpec);  int heightValue = MeasureSpec.getSize(heightMeasureSpec);   switch (heightMode){   case MeasureSpec.AT_MOST:   case MeasureSpec.UNSPECIFIED:    //没有指定大小 按照第一个子控件的大小来设置    height = mainChild.getMeasuredHeight();    break;   case MeasureSpec.EXACTLY:    height = heightValue;    break;  }  switch (widthMode){   case MeasureSpec.AT_MOST:   case MeasureSpec.UNSPECIFIED:    //没有指定大小 按照第一个子控件的大小来设置    width = mainChild.getMeasuredWidth();    break;   case MeasureSpec.EXACTLY:    width = widthValue;    break;  } //  for (int i=1;i<childCount;++i){//   measureChild(getChildAt(i),widthMeasureSpec,MeasureSpec.makeMeasureSpec(height,MeasureSpec.EXACTLY));//  }  setMeasuredDimension(width,height); }   @Override public boolean dispatchTouchEvent(MotionEvent ev) {  return super.dispatchTouchEvent(ev); }  @Override public boolean onInterceptTouchEvent(MotionEvent ev) {    switch (ev.getAction()){   case MotionEvent.ACTION_DOWN:    firstPoint = new PointF(ev.getX(),ev.getY());    lastPoint = new PointF(ev.getX(),ev.getY());    break;   case MotionEvent.ACTION_MOVE:    float moveDistance = ev.getX()-firstPoint.x;     //移动距离大于制定值 认为进入控件的滑动模式    if (Math.abs(moveDistance) > mTouchSlop ){     //让父控件不拦截我们的事件     getParent().requestDisallowInterceptTouchEvent(true);     //拦截事件     return true;    }   }  return super.onInterceptTouchEvent(ev); }  @Override public boolean onTouchEvent(MotionEvent ev) {  switch (ev.getAction()){   case MotionEvent.ACTION_MOVE:    float moveDistance = ev.getX()-lastPoint.x;    lastPoint = new PointF(ev.getX(),ev.getY());     // 这里要注意 x大于0的时候 往左滑动 小于0往右滑动    scrollBy((int) -moveDistance ,0);     //边界判定 超过了边界 直接设置为边界值    if (getScrollX()> mSwipeWidth){     scrollTo(mSwipeWidth,0);    }else if (getScrollX()<0){     scrollTo(0,0);    }    break;   case MotionEvent.ACTION_UP:    //没动 不理他    if (getScrollX()== mSwipeWidth ||getScrollX()==0){     return false;    }     float distance = ev.getX()-firstPoint.x;    //滑动距离超过 可滑动距离指定值 继续完成滑动     if (Math.abs(distance) > mSwipeWidth *0.3 ){      if (distance>0){       smoothClose();      }else if (distance<0){       smoothOpen();      }     }else {      if (distance>0){       smoothOpen();       }else if (distance<0){       smoothClose();      }     }     return true;  }   return super.onTouchEvent(ev); }  public void smoothOpen(){   clearAnimator();  openAnimator = ValueAnimator.ofInt(getScrollX(), mSwipeWidth);  openAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {   @Override   public void onAnimationUpdate(ValueAnimator animation) {    Integer integer = (Integer) animation.getAnimatedValue();    scrollTo(integer,0);   }  });  openAnimator.start(); } public void smoothClose(){  clearAnimator();  closeAnimator = ValueAnimator.ofInt(getScrollX(),0);  closeAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {   @Override   public void onAnimationUpdate(ValueAnimator animation) {    Integer integer = (Integer) animation.getAnimatedValue();    scrollTo(integer,0);   }  });  closeAnimator.start();  }  public void open(){  scrollTo(mSwipeWidth,0); } public void close(){  scrollTo(0,0);  }//执行滑动动画必须先清除动画 不然会鬼畜 private void clearAnimator(){  if (closeAnimator!=null && closeAnimator.isRunning()){   closeAnimator.cancel();   closeAnimator = null;  }  if (openAnimator!=null && openAnimator.isRunning()) {   openAnimator.cancel();   openAnimator = null;  } }  public void toggle(){  if (getScrollX()==0){   open();  }else {   close();  } } }

<com.example.chenweiqi.simplerefreshview.widget.SwipeLayout  android:id="@+id/swipeLayout"  android:layout_width="200dp"  android:layout_height="wrap_content"  android:background="#F3F3F3"><Button  android:id="@+id/btn"  android:text="123"  android:layout_width="match_parent"  android:layout_height="50dp" /> <Button  android:background="#FF0000"  android:text="shanchu"  android:layout_width="80dp"  android:layout_height="match_parent" /><TextView  android:gravity="center"  android:textAlignment="center"  android:background="#0F0"  android:text="123"  android:layout_width="30dp"  android:layout_height="match_parent" /></com.example.chenweiqi.simplerefreshview.widget.SwipeLayout>