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Android swapping two images with animation
<?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"
>
<Button
android:id="@+id/btn1"
android:text="Button 1"
android:layout_width="fill_parent"
android:layout_height="45dip"
android:layout_marginTop="10dip"
/>

<Button
android:id="@+id/btn2"
android:text="Button 2"
android:layout_width="fill_parent"
android:layout_height="45dip"
android:layout_marginTop="10dip" />

<Button
android:id="@+id/btn3"
android:text="Button 3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dip"
/>

<Button
android:id="@+id/btn4"
android:text="Button 4"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dip"
/>
</LinearLayout>

import android.app.Activity;
  import android.os.Bundle;
  import android.view.animation.Animation;
  import android.view.animation.TranslateAnimation;
  import android.widget.Button;

  public class LayoutMargingActivity extends Activity
  {
Button b1, b2, b3, b4;

TranslateAnimation left, right;
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    left = new TranslateAnimation(-480, 10, 0, 10);
    right= new TranslateAnimation( 480, 10, 0, 10);

    left.setDuration(2000);
    right.setDuration(2000);

    left.setRepeatCount( 1 );
    right.setRepeatCount( 1 );

    b1 =(Button)findViewById( R.id.btn1);
    b2 =(Button)findViewById( R.id.btn2);
    b3 =(Button)findViewById( R.id.btn3);
    b4 =(Button)findViewById( R.id.btn4);

    b1.startAnimation(left);
    b2.startAnimation(right);
    b3.startAnimation(left);
    b4.startAnimation(right);
}