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
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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;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
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<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服务器之家。
原文链接：https://blog.csdn.net/qq_20352713/article/details/85063628
