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。

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