ProgressBar - Android Widgets Example

package com.myapp;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.ViewSwitcher;

public class MainActivity extends Activity {

    ViewSwitcher Vs;
    private static final int REFRESH_SCREEN = 1;
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        // viewSwitcher1
        Vs = (ViewSwitcher) findViewById(R.id.viewSwitcher1);
        startScan();
        
        // Reload again
        Button btn1 = (Button) findViewById(R.id.button1);
        btn1.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
            	Vs.showPrevious();
            	startScan();
            }
        });
        	
    }
    
	public void startScan() {
		new Thread() {
			public void run() {					
				try{			
					Thread.sleep(5000);
					hRefresh.sendEmptyMessage(REFRESH_SCREEN);
				}catch(Exception e){
				}
			}
		}.start();
	}
	
	@SuppressLint("HandlerLeak")
	Handler hRefresh = new Handler(){
		public void handleMessage(Message msg) {
			switch(msg.what){
			case REFRESH_SCREEN:
				Vs.showNext();
				break;
			default:
				break;
			}
		}
	};

	@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
	
 
}

<ViewAnimator xmlns:android="http://schemas.android.com/apk/res/android"
  	android:id="@+id/viewAnimator1"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_gravity="center_horizontal" >
   
	<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
	    xmlns:tools="http://schemas.android.com/tools"
	    android:id="@+id/tableLayout1"
	    android:layout_width="match_parent"
	    android:layout_height="match_parent"
	    android:layout_marginTop="50dp" >

        <Button
	    android:id="@+id/button1"
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:text="LoadData" />
            	
     </TableLayout>
     
	

	<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">

		<ProgressBar
		    android:id="@+id/progressBar1"
		    android:layout_width="wrap_content"
		    android:layout_height="wrap_content" />

     </TableLayout>
     
	
	<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
	    xmlns:tools="http://schemas.android.com/tools"
	    android:id="@+id/tableLayout3"
	    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:textAppearance="?android:attr/textAppearanceSmall" />    
            	     
    </TableLayout>

</ViewAnimator>