Tuesday, December 3, 2013

Handle end of animation for AnimationDrawable

I have a old exercise "Create frame animation with AnimationDrawable", which play animation repeatly without handle end of the animation. In this exercise, I will do something when the animation end.


AnimationDrawable have no any Listener for the end of animation, and also I cannot use the isRunning() method to determine the end of animation. Finally, I calculate the total duration of the animation using its getNumberOfFrames() and getDuration(). And then use Timer and TimerTask to schedule a Runnable() run when the time reached.

First of all, modify /res/anim/anim_android.xml to set android:oneshot="true", re-use the layout, main.xml, and the frame pictures. All of them can be found here.

Main code:
package com.exercise.AndroidAnimation;

import java.util.Timer;
import java.util.TimerTask;

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

public class AndroidAnimationActivity extends Activity {
    
 AnimationDrawable myAnimationDrawable;
 
 Timer timer;
 MyTimerTask myTimerTask;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        ImageView myAnimation = (ImageView)findViewById(R.id.myanimation);
        myAnimationDrawable 
         = (AnimationDrawable)myAnimation.getDrawable();

        myAnimation.post(
          new Runnable(){

     @Override
     public void run() {
      myAnimationDrawable.start();
     }
          });
        
        //Calculate the total duration
        int duration = 0;
        for(int i = 0; i < myAnimationDrawable.getNumberOfFrames(); i++){
         duration += myAnimationDrawable.getDuration(i);
        }
        
        timer = new Timer();
        myTimerTask = new MyTimerTask();
        timer.schedule(myTimerTask, duration);
    }
    
    class MyTimerTask extends TimerTask {

  @Override
  public void run() {
   
   timer.cancel();
   runOnUiThread(new Runnable(){
    @Override
    public void run() {
     Toast.makeText(getApplicationContext(), 
       "Animation Stopped", 
       Toast.LENGTH_SHORT).show(); 
    }});
  }  
 }
}



download filesDownload the files.

Next:
Start main activity after splash screen with animation

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