MainActivity如下:
package cc.testlistviewscollbar;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.os.Bundle;
import android.widget.AbsListView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.app.Activity;
import android.graphics.drawable.Drawable;
/**
* Demo描述:
* 利用反射修改ListView的ScollBar图标
*
* 注意事项:
* 并不是说这么做就一定会有效果.
* 只有当ListView要显示的数据足够多(比如四屏或更多)时才会起到作用.
*
* 参考资料:
* 1 http://blog.csdn.net/java2009cgh/article/details/7301197
* 2 http://blog.csdn.net/lfdfhl/article/details/10311505
* Thank you very much
*
*/
public class MainActivity extends Activity {
private ListView mListView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
setFastScrollBarForListView();
}
private void init(){
mListView=(ListView) findViewById(R.id.listview);
List<HashMap<String, Object>> list=new ArrayList<HashMap<String,Object>>();
HashMap<String, Object> hashMap=null;
for (int i = 0; i < 100; i++) {
hashMap=new HashMap<String, Object>();
hashMap.put("name", "小明"+i);
hashMap.put("phone", "135"+i);
hashMap.put("amount","500"+i);
list.add(hashMap);
}
SimpleAdapter adapter=new SimpleAdapter(this, list, R.layout.listviewitem,
new String []{"name","phone","amount"}, new int[]{R.id.name,R.id.phone,R.id.amount});
mListView.setAdapter(adapter);
}
//修改ListView的FastScroller图标
private void setFastScrollBarForListView() {
try {
Field field = AbsListView.class.getDeclaredField("mFastScroller");
field.setAccessible(true);
Object object = field.get(mListView);
field = field.getType().getDeclaredField("mThumbDrawable");
field.setAccessible(true);
Drawable drawable = (Drawable) field.get(object);
drawable = getResources().getDrawable(R.drawable.ic_launcher);
field.set(object, drawable);
} catch (Exception e) {
System.out.println("----> 异常信息:"+e.toString());
e.printStackTrace();
}
}
}
main.xml如下:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ListView
android:id="@+id/listview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerInParent="true"
android:fastScrollEnabled="true"
android:focusable="true" />
</RelativeLayout>
listviewitem如下:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="50dip"
android:gravity="center"
android:orientation="horizontal" >
<TextView
android:id="@+id/name"
android:layout_width="100dip"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/phone"
android:layout_width="150dip"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/amount"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
