android实现简单左滑删除控件

本文为大家分享了一个简单的android左滑删除控件，供大家参考，具体内容如下

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;i1) {
   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 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();
  }
 }
 
}

使用

效果

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。