Android การทำ Splash Screen Loading ในช่วงระหว่างการเข้าสู่ App หรือระหว่างในช่วงรอการเปลี่ยนหน้า

package com.myapp;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.content.Intent;

public class MainActivity extends Activity {

	private static final int REFRESH_SCREEN = 1;
	
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		startScan();
        
	}
	
	public void startScan() {
		new Thread() {
			public void run() {					
				try{			
					Thread.sleep(5000);
					hRefresh.sendEmptyMessage(REFRESH_SCREEN);
				}catch(Exception e){
				}
			}
		}.start();
	}
	
	Handler hRefresh = new Handler(){
		public void handleMessage(Message msg) {
			switch(msg.what){
			case REFRESH_SCREEN:
				
				// Open ActivityForm2
                Intent newActivity = new Intent(MainActivity.this,ActivityForm2.class);
                startActivity(newActivity);
				
				break;
			default:
				break;
			}
		}
	};

}

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/tableLayout2"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginTop="50dp" >

       <TextView
           android:id="@+id/textView1"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:gravity="center"
           android:text="Welcome to My App"
           android:textAppearance="?android:attr/textAppearanceMedium" />

       <ImageView
           android:id="@+id/imageView1"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:src="@drawable/pic_a"
           android:layout_marginTop="10dp"  />
       
       <TextView
           android:id="@+id/textView2"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:gravity="center"
           android:text="CopyRight 2012 www.ThaiCreate.Com"
           android:textAppearance="?android:attr/textAppearanceSmall" />   
           
       <Button
	    android:id="@+id/button1"
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:text="Reload again" />
          
   </TableLayout>