Android ListView圆角
Posted blfbuaa
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首先来看看ListView 相关基本属性
1、单击列表后，列表的背景变成黑色了。
可通过指定android:cacheColorHint的属性来放变它，将它指定为透明。
使用以下的属性值：
android:cacheColorHint="#000000" 就可以。
2、去除列表项中间的切割线：android:divider="#00000000"，这里的值也能够指向一个drawable图片对象(android:divider="@drawable/list_line")。假设使用了图片高度大于系统的像素的话，能够自己设定一个高度。
android:dividerHight="10px"
3、listview在拖动时。listview的背景变成黑色。用这个可解决：android:scrollingCache="false"
4、listview的上边和下边有黑色的阴影。用这个可解决：android:fadingEdge="none"
5、listview右边的滑动条覆盖列表项的内容。用这个可解决：android:scrollbarStyle="outsideInset"
6、改动listvew右边的滑动条与列表项之间的距离。
用这个可解决：android:paddingRight="10dip"。能够依据须要进行改动。
7、改动右边的滑动条显示的颜色。用这个可解决：
android:scrollbarTrackVertical="@drawable/scrollbar_vertical_track"
android:scrollbarThumbVertical="@drawable/scrollbar_vertical_thumb"
当中scrollbar_vertical_track和scrollbar_vertical_thumb是滑动条的XML配置文件，在API中有，可依据自己的须要改动一下開始颜色和结束颜色就可以。
详细请參考这篇文章 Android ListView 属性
以下来看看ListView 圆角实现，本文主要亮点是数据源能够灵活设置。不用在xml上写死了。
1.在drawable文件下新建
list_bottom_selector.xml
<?如法炮制 新建几个xmlxml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_pressed="true"><shape> <solid android:color="#ADFF2F" /> <corners android:bottomLeftRadius="4dp" android:bottomRightRadius="4dp" /> </shape></item> <item><shape> <solid android:color="@color/white" /> <corners android:bottomLeftRadius="4dp" android:bottomRightRadius="4dp" /> </shape></item> </selector>
list_rect_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true"><shape>
<solid android:color="#ADFF2F" />
</shape></item>
<item><shape>
<solid android:color="@color/white" />
</shape></item>
</selector>list_round_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true"><shape>
<solid android:color="#ADFF2F" />
<corners android:bottomLeftRadius="4dp" android:bottomRightRadius="4dp"
android:topLeftRadius="4dp" android:topRightRadius="4dp"/>
</shape></item>
<item><shape>
<solid android:color="@color/white" />
<corners android:bottomLeftRadius="4dp" android:bottomRightRadius="4dp"
android:topLeftRadius="4dp" android:topRightRadius="4dp"/>
</shape></item>
</selector> list_top_selector.xml
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_pressed="true"><shape> <solid android:color="#ADFF2F" /> <corners android:topLeftRadius="4dp" android:topRightRadius="4dp" /> </shape></item> <item><shape> <solid android:color="@color/white" /> <corners android:topLeftRadius="4dp" android:topRightRadius="4dp" /> </shape></item> </selector>
接下来我们在layout新建一个item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingRight="5dp"
>
<TextView
android:id="@+id/text"
android:layout_width="fill_parent"
android:layout_height="40dp"
android:textSize="16sp"
android:paddingLeft="15dp"
android:textColor="#000000"
android:gravity="left|center_vertical"
/>
<ImageView
android:src="@drawable/common_left"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"
/>
</RelativeLayout>后新建一个activity_main.xml 来作为我们程序的主页面。也就是我们要显示ListView，布局也非常easy
例如以下：
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:paddingLeft="10dp" android:paddingRight="10dp" android:paddingTop="15dp" > <ListView android:id="@+id/list1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="@drawable/round_bg" android:cacheColorHint="#00000000" android:divider="@color/list_divider" android:dividerHeight="0.1dp" android:listSelector="#00000000" > </ListView> <ListView android:id="@+id/list2" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="15dp" android:background="@drawable/round_bg" android:cacheColorHint="#00000000" android:divider="@color/list_divider" android:dividerHeight="0.1dp" android:listSelector="#00000000" > </ListView> <ListView android:id="@+id/list3" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="15dp" android:background="@drawable/round_bg" android:cacheColorHint="#00000000" android:divider="@color/list_divider" android:dividerHeight="1px" android:listSelector="@color/transparent" > </ListView> </LinearLayout>
然后新建一个MainActivity
public class MainActivity extends Activity {
private ListView list1;
private ListView list2;
private ListView list3;
String array1[] = {"设置"};
String array2[] = {"朋友圈","我的空间"};
String array3[] = {"我的钱包","我的收藏","我的相冊","关联"};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
private void initView()
{
list1 = (ListView) findViewById(R.id.list1);
list2 = (ListView) findViewById(R.id.list2);
list3 = (ListView) findViewById(R.id.list3);
list1.setAdapter(new MyListAdapter(array1,this));
list2.setAdapter(new MyListAdapter(array2,this));
list3.setAdapter(new MyListAdapter(array3,this));
}
}后面我们自己定义一个MyListAdapter 继承BaseAdapter
public class MyListAdapter extends BaseAdapter {
private LayoutInflater inflater;
private String[] array;
private Context mContext;
public MyListAdapter(String[] array,Context context) {
inflater = LayoutInflater.from(context);
this.array = array;
this.mContext =context;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return array.length;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return array[position];
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
convertView = inflater.inflate(R.layout.item, null);
TextView tv = (TextView) convertView.findViewById(R.id.text);
tv.setText(array[position]);
if (array.length == 1) {
setBackgroundDrawable(convertView,
R.drawable.list_round_selector);
} else if (array.length == 2) {
if (position == 0) {
setBackgroundDrawable(convertView,
R.drawable.list_top_selector);
} else if (position == array.length - 1) {
setBackgroundDrawable(convertView,
R.drawable.list_bottom_selector);
}
} else {
if (position == 0) {
setBackgroundDrawable(convertView,
R.drawable.list_top_selector);
} else if (position == array.length - 1) {
setBackgroundDrawable(convertView,
R.drawable.list_bottom_selector);
} else {
setBackgroundDrawable(convertView,
R.drawable.list_rect_selector);
}
}
return convertView;
}
private void setBackgroundDrawable(View view, int resID) {
view.setBackgroundDrawable(mContext.getResources().getDrawable(resID));
}
}
效果图：
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