android開發之方形圓角listview

我寫這篇文章受到了kiritor的專欄發表的博文Android UI控制項之ListView實現圓角效果的啟發。

先看：

首先，你得寫一個類我們命名為CornerListView

 

/** * 圓角ListView樣本 * @Description: 圓角ListView樣本 * @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> 

寫好了之後，就可以在你的代碼中直接像listview一樣調用。