Android--ListView滚动条样式

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当ListView的记录超过4页时才会显示滑块

java代码：
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package com.example.test0123;

import java.lang.reflect.Field;
import android.app.Activity;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class TestList extends Activity {
ListView lv;

protected void onCreate(Bundle savedInstanceState) {      super.onCreate(savedInstanceState);      setContentView(R.layout.list);      lv = (ListView) findViewById(R.id.listView1);      lv.setAdapter(new ListAdapter());      try {          Field f = AbsListView.class.getDeclaredField("mFastScroller");          f.setAccessible(true);          Object o = f.get(lv);          f = f.getType().getDeclaredField("mThumbDrawable");          f.setAccessible(true);          Drawable drawable = (Drawable) f.get(o);          drawable = getResources().getDrawable(R.drawable.ic_launcher);          f.set(o, drawable);      } catch (Exception e) {          throw new RuntimeException(e);      }  }  public class ListAdapter extends BaseAdapter {      public int getCount() {          return 200;      }      public Object getItem(int position) {          return null;      }      public long getItemId(int position) {          return 0;      }      public View getView(int position, View convertView, ViewGroup parent) {          TextView tv = new TextView(TestList.this);          tv.setTextSize(30);          tv.setText("aaaaa" + position);          return tv;      }  }

}

list.xml代码：设置fastScrollEnabled为true

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