Android中Market的Loading效果实现方法

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
   android:gravity="center_vertical|center_horizontal"
  android:orientation="horizontal"
  android:id="@+id/fullscreen_loading_style"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent" 
 >
 <ProgressBar 
 android:layout_gravity="center_vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="?android:attr/progressBarStyleSmall"
/>
<TextView
  android:id="@+id/current_action"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_marginLeft="5.0dip"
  android:text="@+string/loading"
/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical" android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <LinearLayout android:orientation="vertical" 
    android:id="@+id/main_info"
    android:visibility="gone" 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TextView android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:text="abc"></TextView>
  </LinearLayout>
  <LinearLayout android:orientation="vertical" 
    android:id="@+id/main_Loading"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <include android:visibility="visible" 
      android:layout_width="fill_parent"
      android:layout_height="fill_parent" 
      layout="@layout/fullscreen_loading_style" />
  </LinearLayout>
</LinearLayout>

package com.tymx.fullloading;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.LinearLayout;
public class myFullLoading extends Activity {
  /** Called when the activity is first created. */
  private LinearLayout mLoadingLayout;
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    final Handler handler = new Handler(){
      @Override
      public void handleMessage(Message msg) {
        // TODO Auto-generated method stub
        super.handleMessage(msg);
        if (msg.what==1){
          mLoadingLayout = (LinearLayout)findViewById(R.id.fullscreen_loading_style);
          mLoadingLayout.setVisibility(View.GONE);
          LinearLayout mMain = (LinearLayout)findViewById(R.id.main_info);
          mMain.setVisibility(View.VISIBLE);
        }
      }
    };
    new Thread(){
      public void run(){
        for (int i=0;i<1000;i++){
          System.out.print(i+"");
        }
        Message msg = handler.obtainMessage(1,"flash");
        handler.sendMessage(msg);
      }
    }.start();
  }
}