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这篇文章给大家介绍利用android怎么实现一个左滑删除控件，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。
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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
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