利用反射修改ListView的ScollBar图标

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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;@Overrideprotected 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>

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