android开发过程中如何实现方形圆角listview

/**
 * 圆角ListView示例
 * @Description: 圆角ListView示例
 * @FileName: CornerListView.java
 */
public class CornerListView extends ListView {
    public CornerListView(Context context) {
        super(context);
    }

    public CornerListView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public CornerListView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
                int x = (int) ev.getX();
                int y = (int) ev.getY();
                int itemnum = pointToPosition(x, y);

                if (itemnum == AdapterView.INVALID_POSITION)
                        break;                 
                else{
                    if(itemnum==0){
                        if(itemnum==(getAdapter().getCount()-1)){                                    
                            setSelector(R.drawable.<SPAN style="COLOR: #ff0000">app_list_corner_round</SPAN>);
                        }else{
                            setSelector(R.drawable.<SPAN style="COLOR: #ff0000">app_list_corner_round_top</SPAN>);
                        }
                    }else if(itemnum==(getAdapter().getCount()-1))
                            setSelector(R.drawable.<SPAN style="COLOR: #ff0000">app_list_corner_round_bottom</SPAN>);
                    else{                            
                        setSelector(R.drawable.<SPAN style="COLOR: #ff0000">app_list_corner_shape</SPAN>);
                    }
                }

                break;
        case MotionEvent.ACTION_UP:
                break;
        }

        return super.onInterceptTouchEvent(ev);
    }
}

 

/**
 * 圆角ListView示例
 * @Description: 圆角ListView示例
 * @FileName: CornerListView.java
 */
public class CornerListView extends ListView {
    public CornerListView(Context context) {
        super(context);
    }

    public CornerListView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public CornerListView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
                int x = (int) ev.getX();
                int y = (int) ev.getY();
                int itemnum = pointToPosition(x, y);

                if (itemnum == AdapterView.INVALID_POSITION)
                        break;               
                else{
                 if(itemnum==0){
                        if(itemnum==(getAdapter().getCount()-1)){                                  
                            setSelector(R.drawable.app_list_corner_round);
                        }else{
                            setSelector(R.drawable.app_list_corner_round_top);
                        }
                 }else if(itemnum==(getAdapter().getCount()-1))
                         setSelector(R.drawable.app_list_corner_round_bottom);
                 else{                          
                     setSelector(R.drawable.app_list_corner_shape);
                 }
                }

                break;
        case MotionEvent.ACTION_UP:
                break;
        }

        return super.onInterceptTouchEvent(ev);
    }
}

 

<SPAN style="COLOR: #333333"><?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient android:startColor="#BFEEFF" 
        android:endColor="#40B9FF" 
        android:angle="270"/>
    <corners android:topLeftRadius="6dip"
        android:topRightRadius="6dip"
        android:bottomLeftRadius="6dip"
        android:bottomRightRadius="6dip"/>
</shape> </SPAN>

 

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient android:startColor="#BFEEFF"
        android:endColor="#40B9FF"
        android:angle="270"/>
    <corners android:topLeftRadius="6dip"
        android:topRightRadius="6dip"
        android:bottomLeftRadius="6dip"
        android:bottomRightRadius="6dip"/>
</shape>

<SPAN style="COLOR: #333333"><?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient android:startColor="#BFEEFF" 
        android:endColor="#40B9FF" 
        android:angle="270"/>
    <corners android:topLeftRadius="6dip"
        android:topRightRadius="6dip"/>
</shape> </SPAN>

 

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient android:startColor="#BFEEFF"
        android:endColor="#40B9FF"
        android:angle="270"/>
    <corners android:topLeftRadius="6dip"
        android:topRightRadius="6dip"/>
</shape>

<SPAN style="COLOR: #333333"><?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient android:startColor="#BFEEFF" 
        android:endColor="#40B9FF" 
        android:angle="270"/>
    <corners android:bottomLeftRadius="6dip"
        android:bottomRightRadius="6dip" />
</shape> </SPAN>

 

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient android:startColor="#BFEEFF"
        android:endColor="#40B9FF"
        android:angle="270"/>
    <corners android:bottomLeftRadius="6dip"
        android:bottomRightRadius="6dip" />
</shape>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient android:startColor="#BFEEFF" 
        android:endColor="#40B9FF" 
        android:angle="270"/>
</shape> 

 

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient android:startColor="#BFEEFF"
        android:endColor="#40B9FF"
        android:angle="270"/>
</shape>