listview 侧滑删除（-）单独的侧滑删除

以前我也在网上用过别人写的侧滑删除，但是总是不那么顺畅，而且各种冲突，比如跟onitemclick点击事件，listview本身的滑动事件，还有下拉刷新的事件等等……所以现在自己写了个侧滑删除，用的是scroller，算是没有什么冲突吧，但是要和下拉刷新完美兼容，还得在下拉刷新里做些处理，这次我先给大家介绍单独地demo，下一篇再将侧滑删除和下拉刷新以及上拉自动加载全部整合起来。

效果图：

主要代码1：MyScrollListView.java

package com.example.scolltodelete;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.ViewConfiguration;
import android.widget.ListView;

public class MyScrollListView extends ListView {
private int xDown, yDown;
private ScrollLayout childView;
private int mTouchSlop;
private boolean isResetting;

public MyScrollListView(Context context, AttributeSet attrs) {
    super(context, attrs);
    mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();
}


@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
    switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN:

        if (childView != null && !childView.isReset()) {
            isResetting = true;
            childView.reset();
        }
        childView = getChildView((int) event.getX(), (int) event.getY());
        xDown = (int) event.getRawX();
        yDown = (int) event.getRawY();
        break;
    case MotionEvent.ACTION_MOVE:

        int xMove = (int) event.getRawX();
        int yMove = (int) event.getRawY();

        int dx = xMove - xDown;
        int dy = yMove - yDown;

        if (Math.abs(dx) >= Math.abs(dy)) {
            Log.e("tttext","trueee");
            return true;
        }


        break;
    case MotionEvent.ACTION_UP:



        break;

    default:
        break;
    }


    return super.onInterceptTouchEvent(event);

}
@Override
public boolean onTouchEvent(MotionEvent event) {

    switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN:
        break;
    case MotionEvent.ACTION_MOVE:

        int xMove = (int) event.getRawX();
        int yMove = (int) event.getRawY();

        int dx = xMove - xDown;
        int dy = yMove - yDown;

        if (Math.abs(dx) >= Math.abs(dy) && Math.abs(dx) >= mTouchSlop && childView != null) {
            if (childView.isAbleToScroll()) {
                xDown = (int) event.getRawX();
                yDown = (int) event.getRawY();
                childView.smoothScrollBy(-dx, 0, 0);
            }
        }
        if (childView != null && !childView.isReset()) {
            event.setAction(MotionEvent.ACTION_CANCEL);
        }

        break;
    case MotionEvent.ACTION_UP:

        if (childView != null && !childView.isReset()) {
            childView.upToReset();
            event.setAction(MotionEvent.ACTION_CANCEL);
        } else if (isResetting) {
            event.setAction(MotionEvent.ACTION_CANCEL);

            isResetting = false;
        }

        break;

    default:
        break;
    }

    return super.onTouchEvent(event);
}

private ScrollLayout getChildView(int x, int y) {
    int index = pointToPosition(x, y) - getFirstVisiblePosition();
    return (ScrollLayout) getChildAt(index);
}

public boolean isScrolling() {
    return childView != null && !childView.isReset();
}

}

主要代码2:ScrollLayout

package com.example.scolltodelete;

import android.content.Context;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.ViewConfiguration;
import android.view.WindowManager;
import android.widget.LinearLayout;
import android.widget.Scroller;

public class ScrollLayout extends LinearLayout{
private Scroller mScroller;
private int mScrollmaxWith;
public ScrollLayout(Context context, AttributeSet attrs) {
super(context, attrs);
mScroller = new Scroller(context);
DisplayMetrics metric = new DisplayMetrics();
WindowManager manager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
manager.getDefaultDisplay().getMetrics(metric);
mScrollmaxWith = (int) (200*metric.density);
}

public void smoothScrollBy(int dx, int dy, int time) {

    if (time == 0) {
        mScroller.startScroll(mScroller.getFinalX(), mScroller.getFinalY(), dx, dy);
    } else {
        mScroller.startScroll(mScroller.getFinalX(), mScroller.getFinalY(), dx, dy, time);
    }
    invalidate();
}

public void reset(){
    smoothScrollBy(-mScroller.getFinalX(), 0,0);
}
public void upToReset(){
    int d = Math.abs(-mScroller.getFinalX());
    if(d<mScrollmaxWith/2){
        reset();
    }else{
        smoothScrollBy(mScrollmaxWith-d,0,0);
    }
}
public boolean isReset(){
    return mScroller.getFinalX()==0;
}

public boolean isAbleToScroll(){
    int d = mScroller.getFinalX();
    if(d>mScrollmaxWith){
        smoothScrollBy(mScrollmaxWith-d,0,0);
        return false;
    }else if(d<=mScrollmaxWith&&d>=0){
        return true;
    }else{
        smoothScrollBy(-d,0,0);
        return false;
    }
}
@Override
public void computeScroll() {

    if (mScroller.computeScrollOffset()) {

        scrollTo(mScroller.getCurrX(), mScroller.getCurrY());

        invalidate();
    }       
    super.computeScroll();
}

}

主要代码3：itme.xml

<?xml version="1.0" encoding="utf-8"?>
<com.example.scolltodelete.ScrollLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/bg_myraw" android:orientation="horizontal" >

    <TextView  android:id="@+id/tv" android:layout_width="match_parent" android:layout_height="50dp" android:textColor="@color/money" />

    <LinearLayout  android:padding="2dp" android:layout_width="200dp" android:layout_height="wrap_content" android:orientation="horizontal" >

        <TextView  android:id="@+id/tv_cancel" android:layout_width="100dp" android:layout_height="50dp" android:background="@color/hint" android:text="取消" android:gravity="center" android:textColor="@color/white" />

        <TextView  android:id="@+id/tv_delete" android:layout_width="100dp" android:layout_height="50dp" android:background="@color/money" android:gravity="center" android:text="删除" android:textColor="@color/white" />
    </LinearLayout>

</com.example.scolltodelete.ScrollLayout>

最后是源码下载地址：
http://download.csdn.net/detail/feiyang877647044/9484964