在Android上显示动画

Question

I am trying to perform animation on 4 png images. I have drawable folder in res folder,containing the images to be animated and one animation.xml

Now my problem is that:when I say animation.start I cannot see anything on the emulator

my code:

package com.androcles.TreeActivity;

 import android.app.Activity;
 import android.graphics.drawable.AnimationDrawable;
 import android.os.Bundle;
 import android.widget.ImageView;

public class TreeActivity extends Activity {

 private ImageView image1;
@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_tree);
   image1 = (ImageView)findViewById(R.id.imageView1);
   image1.setImageBitmap(null);
   image1.setBackgroundResource(R.drawable.animation);




final AnimationDrawable mailAnimation = (AnimationDrawable) image1.getBackground();
image1.post(new Runnable() {
    public void run()
    {
        if ( mailAnimation != null )
        {   
            System.out.println("Before Animation Starts...!!!!!");
            mailAnimation.start();
            System.out.println("After Animation Starts...!!!!!");
        }
    }
});
}
 }

Answer 1

Try this way:

  m_animation = AnimationUtils.loadAnimation( getApplicationContext(), R.anim.alpha_animation); m_ivImage.startAnimation(m_animation); 

Answer 2

Try with these codes.

View view;
 view=(Button)findViewById(R.id.continue_but);    // may be image or some thing 


   Animation hyperspaceJump = AnimationUtils.loadAnimation(AppActivity.this, R.anim.slide_left); 
         view.startAnimation(hyperspaceJump); 
         view.setVisibility(View.VISIBLE);