SildingFinishLayout.java

package com.wm.remusic.widget;

import android.content.Context;
import android.util.AttributeSet;  
import android.view.MotionEvent;  
import android.view.View;  
import android.view.View.OnTouchListener;  
import android.view.ViewConfiguration;  
import android.view.ViewGroup;  
import android.widget.AbsListView;  
import android.widget.RelativeLayout;  
import android.widget.ScrollView;  
import android.widget.Scroller;  
  
/** 
 * 自定义可以滑动的RelativeLayout, 类似于IOS的滑动删除页面效果，当我们要使用 
 * 此功能的时候，需要将该Activity的顶层布局设置为SildingFinishLayout， 
 * 然后需要调用setTouchView()方法来设置需要滑动的View 
 *  
 * @author xiaanming 
 *  
 * @blog http://blog.csdn.net/xiaanming 
 *  
 */  
public class SildingFinishLayout extends RelativeLayout implements  
        OnTouchListener {  
    /** 
     * SildingFinishLayout布局的父布局 
     */  
    private ViewGroup mParentView;  
    /** 
     * 处理滑动逻辑的View 
     */  
    private View touchView;  
    /** 
     * 滑动的最小距离 
     */  
    private int mTouchSlop;  
    /** 
     * 按下点的X坐标 
     */  
    private int downX;  
    /** 
     * 按下点的Y坐标 
     */  
    private int downY;  
    /** 
     * 临时存储X坐标 
     */  
    private int tempX;  
    /** 
     * 滑动类 
     */  
    private Scroller mScroller;  
    /** 
     * SildingFinishLayout的宽度 
     */  
    private int viewWidth;  
    /** 
     * 记录是否正在滑动 
     */  
    private boolean isSilding;  
      
    private OnSildingFinishListener onSildingFinishListener;  
    private boolean isFinish;  
      
  
    public SildingFinishLayout(Context context, AttributeSet attrs) {  
        this(context, attrs, 0);  
    }  
  
    public SildingFinishLayout(Context context, AttributeSet attrs, int defStyle) {  
        super(context, attrs, defStyle);  
  
        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();  
        mScroller = new Scroller(context);  
    }  
  
    @Override  
    protected void onLayout(boolean changed, int l, int t, int r, int b) {  
        super.onLayout(changed, l, t, r, b);  
        if (changed) {  
            // 获取SildingFinishLayout所在布局的父布局  
            mParentView = (ViewGroup) this.getParent();  
            viewWidth = this.getWidth();  
        }  
    }  
  
    /** 
     * 设置OnSildingFinishListener, 在onSildingFinish()方法中finish Activity 
     *  
     * @param onSildingFinishListener 
     */  
    public void setOnSildingFinishListener(  
            OnSildingFinishListener onSildingFinishListener) {  
        this.onSildingFinishListener = onSildingFinishListener;  
    }  
  
    /** 
     * 设置Touch的View 
     *  
     * @param touchView 
     */  
    public void setTouchView(View touchView) {  
        this.touchView = touchView;  
        touchView.setOnTouchListener(this);  
    }  
  
    public View getTouchView() {  
        return touchView;  
    }  
  
    /** 
     * 滚动出界面 
     */  
    private void scrollRight() {  
        final int delta = (viewWidth + mParentView.getScrollX());  
        // 调用startScroll方法来设置一些滚动的参数，我们在computeScroll()方法中调用scrollTo来滚动item  
        mScroller.startScroll(mParentView.getScrollX(), 0, -delta + 1, 0,  
                Math.abs(delta));  
        postInvalidate();  
    }  
  
    /** 
     * 滚动到起始位置 
     */  
    private void scrollOrigin() {  
        int delta = mParentView.getScrollX();  
        mScroller.startScroll(mParentView.getScrollX(), 0, -delta, 0,  
                Math.abs(delta));  
        postInvalidate();  
    }  
  
    /** 
     * touch的View是否是AbsListView， 例如ListView, GridView等其子类 
     *  
     * @return 
     */  
    private boolean isTouchOnAbsListView() {  
        return touchView instanceof AbsListView ? true : false;  
    }  
  
    /** 
     * touch的view是否是ScrollView或者其子类 
     *  
     * @return 
     */  
    private boolean isTouchOnScrollView() {  
        return touchView instanceof ScrollView ? true : false;  
    }  
  
    @Override  
    public boolean onTouch(View v, MotionEvent event) {  
        switch (event.getAction()) {  
        case MotionEvent.ACTION_DOWN:  
            downX = tempX = (int) event.getRawX();  
            downY = (int) event.getRawY();  
            break;  
        case MotionEvent.ACTION_MOVE:  
            int moveX = (int) event.getRawX();  
            int deltaX = tempX - moveX;  
            tempX = moveX;  
            if (Math.abs(moveX - downX) > mTouchSlop  
                    && Math.abs((int) event.getRawY() - downY) < mTouchSlop) {  
                isSilding = true;  
  
                // 若touchView是AbsListView，  
                // 则当手指滑动，取消item的点击事件，不然我们滑动也伴随着item点击事件的发生  
                if (isTouchOnAbsListView()) {  
                    MotionEvent cancelEvent = MotionEvent.obtain(event);  
                    cancelEvent  
                            .setAction(MotionEvent.ACTION_CANCEL  
                                    | (event.getActionIndex() << MotionEvent.ACTION_POINTER_INDEX_SHIFT));  
                    v.onTouchEvent(cancelEvent);  
                }  
  
            }  
  
            if (moveX - downX >= 0 && isSilding) {  
                mParentView.scrollBy(deltaX, 0);  
  
                // 屏蔽在滑动过程中ListView ScrollView等自己的滑动事件  
                if (isTouchOnScrollView() || isTouchOnAbsListView()) {  
                    return true;  
                }  
            }  
            break;  
        case MotionEvent.ACTION_UP:  
            isSilding = false;  
            if (mParentView.getScrollX() <= -viewWidth / 2) {  
                isFinish = true;  
                scrollRight();  
            } else {  
                scrollOrigin();  
                isFinish = false;  
            }  
            break;  
        }  
  
        // 假如touch的view是AbsListView或者ScrollView 我们处理完上面自己的逻辑之后  
        // 再交给AbsListView, ScrollView自己处理其自己的逻辑  
        if (isTouchOnScrollView() || isTouchOnAbsListView()) {  
            return v.onTouchEvent(event);  
        }  
  
        // 其他的情况直接返回true  
        return true;  
    }  
  
    @Override  
    public void computeScroll() {  
        // 调用startScroll的时候scroller.computeScrollOffset()返回true，  
        if (mScroller.computeScrollOffset()) {  
            mParentView.scrollTo(mScroller.getCurrX(), mScroller.getCurrY());  
            postInvalidate();  
  
            if (mScroller.isFinished()) {  
  
                if (onSildingFinishListener != null && isFinish) {  
                    onSildingFinishListener.onSildingFinish();  
                }  
            }  
        }  
    }  
      
  
    public interface OnSildingFinishListener {  
        public void onSildingFinish();  
    }  
  
}