android开发之方形圆角listview

我写这篇文章受到了kiritor的专栏发表的博文Android UI控件之ListView实现圆角效果的启发。

先看效果图：

首先，你得写一个类我们命名为CornerListView

/**
 * 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);
    }
}

其中，app_list_corner_round

<?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> 

app_list_corner_round_top

<?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> 

app_list_corner_round_bottom

<?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> 

app_list_corner_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> 

写好了之后，就可以在你的代码中直接像listview一样调用。