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;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();
  }
 }
 
}

使用

<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>

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。