Android 类似向右滑动解锁控件

预览图：

滑动后执行操作并且隐去，滑动距离不够则反弹回去。

这种滑动操作的控件基本都会使用ViewDragHelper，而这个控件的代码也十分简单：

package com.yanbang.laiba.widget;import android.content.Context;import android.graphics.Point;import android.support.v4.widget.ViewDragHelper;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.widget.LinearLayout;/** * 向右滑动控件 * Created by Jing on 2016/2/16. */public class SlideRightViewDragHelper extends LinearLayout {    private ViewDragHelper viewDragHelper;    private View child;    private Point childPosition = new Point();    private Point childEndPosition = new Point();    private OnReleasedListener onReleasedListener;    private int oldX;    public SlideRightViewDragHelper(Context context, AttributeSet attrs) {        super(context, attrs);        //新建viewDragHelper ,viewGroup, 灵敏度，回调(子view的移动)        viewDragHelper = ViewDragHelper.create(this, 1.0f, new ViewDragHelper.Callback() {            @Override            public boolean tryCaptureView(View child, int pointerId) {                return true;            }            @Override            public int clampViewPositionHorizontal(View child, int left, int dx) {                oldX = left;                return Math.max(0, left);            }            @Override            public void onViewReleased(View releasedChild, float xvel, float yvel) {                if(oldX > 200){                    viewDragHelper.settleCapturedViewAt(childEndPosition.x, childEndPosition.y);                    invalidate(); //必须刷新,因为其内部使用的是mScroller.startScroll，所以别忘了需要invalidate()以及结合computeScroll方法一起。                    if(onReleasedListener != null)                        onReleasedListener.onReleased();                }else{                    viewDragHelper.settleCapturedViewAt(childPosition.x, childPosition.y); //反弹                    invalidate();                }                super.onViewReleased(releasedChild, xvel, yvel);            }        });    }    @Override    protected void onFinishInflate() {        super.onFinishInflate();        child = getChildAt(0);    }    @Override   //用viewDragHelper拦截-true    public boolean onInterceptTouchEvent(MotionEvent ev) {        return viewDragHelper.shouldInterceptTouchEvent(ev);    }    @Override  //viewDragHelper拦截事件    public boolean onTouchEvent(MotionEvent event) {        viewDragHelper.processTouchEvent(event);        return true;    }    @Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        super.onLayout(changed, l, t, r, b);        //定位一开始的坐标        childPosition.x = child.getLeft();        childPosition.y = child.getTop();        //滑动成功后定位坐标        childEndPosition.x = child.getRight();        childEndPosition.y = child.getTop();    }    @Override    public void computeScroll() {        super.computeScroll();        if (viewDragHelper.continueSettling(true)) {            invalidate();        }    }    public void setOnReleasedListener(OnReleasedListener onReleasedListener){        this.onReleasedListener = onReleasedListener;    }    public interface OnReleasedListener{        void onReleased();    }}

此控件可直接在xml中应用，滑动区域包含在其中，作为childView;

例：

<com.zyj.test.widget.SlideRightViewDragHelper        android:id="@+id/get_order_drag_helper"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal"        android:layout_alignParentBottom="true">        <LinearLayout            android:id="@+id/get_order_ll_slide"            android:layout_width="match_parent"            android:layout_height="50dp"            android:background="@color/app_blue"            android:orientation="horizontal">            <ImageView                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_gravity="center"                android:src="@mipmap/get_order_slide_right"                android:layout_marginLeft="20dp"/>            <TextView                android:layout_width="0dp"                android:layout_height="wrap_content"                android:layout_weight="1"                android:layout_gravity="center"                android:textColor="@color/white"                android:text="滑动"                android:textStyle="bold"                android:layout_marginLeft="10dp"/>            <TextView                android:id="@+id/get_order_tv_left_time"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_gravity="center"                android:textColor="@color/white"                android:text="确认（30s）"                android:textStyle="bold"                android:layout_marginRight="15dp"/>        </LinearLayout>    </com.zyj.test.widget.SlideRightViewDragHelper>

Java代码中设置控件滑动事件：

SlideRightViewDragHelper dragHelper;dragHelper = (SlideRightViewDragHelper) findViewById(R.id.xxxxx);dragHelper.setOnReleasedListener(new SlideRightViewDragHelper.OnReleasedListener() {            @Override            public void onReleased() {                //TODO            }});

至此此控件就完成了。