Frame by Frame Animation in Android

Introduction

 

I remember when I was a child, we have made drawings on papers that acted as animation. We draw numerous slides one by one and arrange them and flip them speedily. So that we realize that is going smoothly like animation. In cartoons also, this technique is used. We can see this in a flipbook.

 

In this concept, we will make some slides called frames and give them individually duration for how long it will appear on the screen and that's it.

 

So, this tutorial will help you to learn how frame by frame animation works. It's very easy.

 

Step 1

 

Find out images that you want for animation. They should be in sequence so that we can realize it as flipping continuously. The file type of images like GIF, PNG , etc. After finding, copy them and place them by copy and paste in

 

"Your project" -> res -> drawable-mdpi -> paste images

 

Drawable has three categories

1. hdpi-> high dots per inch
2. ldpi->large dots per inch
3. mdpi->medium dots per inch

Step 2

 

There are two methods to perform this animation. 1) By creating "BitmapDrawable" objects, 2) By creating "animation" XML file. We will see both methods one by one.

1. Do with "BitmapDrawable"
    
   Syntax:

   BitmapDrawable object=(BitmapDrawable) getResources().getDrawable(R.drawable.<image_name>);

   Example
    
   Suppose I have an image named "sample.png" in "res.drawable" directory, then

   BitmapDrawable frame1=(BitmapDrawable)getResources().getDrawable(R.drawable.sample);
   
   AnimationDrawable animation = new AnimationDrawable();

   Now, we can add frames that we have created above as you want.
    
   Syntax:

   AnimationDrawable.addFrame(BitmapDrawable,duration);

   Example

   animation.addFrame(frame1,1000);

   In this animation, while you start this animation, it will stop after the last added frame. If you like to continue this animation, the following method must be implemented.

   animation.setOneShot(false);
   
   Now, bind "ImageView" object of the layout
   ImageView img=(ImageView)findViewById(R.id.imageView1);
   img.setBackgroundDrawable(animation);
   animation.start();
   animation.stop();

   Description:

    
   • Duration is in milliseconds.
   • setBackgroundDrawable(animation) method will set background with animation and give control over animation.
   • start() method will start your animation and stop() will stop this animation.
       
     
2. Do with "animatin.xml" file in animation directory
    
   First, right click "Your Project" -> new -> Android Xml File ->
    
    
   Now, write down the following code in that file by removing existing codes.

   <?xml version="1.0" encoding="utf-8"?>
   <animation-list
     xmlns:android=http://schemas.android.com/apk/res/android
     android:oneshot="false">
     <item android:drawable="@drawable/sample1" android:duration="50"/>
     <item android:drawable="@drawable/sample2" android:duration="50"/>
     <item android:drawable="@drawable/sample3" android:duration="50"/>
   </animation-list>

   In the above code, I have added 3 frames with "android:drawable" attribute and duration in milliseconds.

    

   Now, bind "ImageView" object with the layout and implement the following methods.

   ImageView img=(ImageView)findViewById(R.id.imageView1);
   img.setImageBitmap(null);
   img.setBackgroundResource(R.anim.animation);
   Next, create object of "AnimatinDrawable" and give background to "AnimationDrawable" so that it can handle it.
   AnimationDrawable animation = (AnimationDrawable) img.getBackground();
   animation.start();
   animation.stop();

Using "BitmapDrawable"

 

Main.java

 package com.animationapp;
import android.app.Activity;
import android.graphics.drawable.AnimationDrawable;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class AnimationAppActvity extends Activity {
    /** Called when the activity is first created. */
    ImageView img;
    Button btnStart,btnStop;
    AnimationDrawable animation;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        int duration = 150;
        img = (ImageView)findViewById(R.id.imageView1);

        BitmapDrawable frame1 =
            (BitmapDrawable)getResources().getDrawable(R.drawable.d1);
        BitmapDrawable frame2 =
            (BitmapDrawable)getResources().getDrawable(R.drawable.d2);
        BitmapDrawable frame3 =
            (BitmapDrawable)getResources().getDrawable(R.drawable.d3);
        animation = new AnimationDrawable();
        animation.addFrame(frame1, duration);
        animation.addFrame(frame2, duration);
        animation.addFrame(frame3, duration);

        animation.setOneShot(false);

        img.setBackgroundDrawable(animation);

        btnStart = (Button)findViewById(R.id.btnStart);
        btnStop = (Button)findViewById(R.id.btnStop);

        btnStart.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                  // TODO Auto-generated method stub
                  animation.start();
            }
        });

        btnStop.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
             // TODO Auto-generated method stub
             animation.stop();
             }
        });
    }
}

Layout file

<?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"
    >
<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello"
    />
<ImageView
      android:layout_height="wrap_content"
      android:id="@+id/imageView1"
      android:layout_width="wrap_content"
      android:minHeight="191px" android:minWidth="285px">
</ImageView>
<Button
      android:text="Start"
      android:id="@+id/btnStart"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content">
</Button>
<Button
      android:text="Stop"
      android:id="@+id/btnStop"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content">
</Button>
</LinearLayout>

Using "animation.xml" file

 package com.AnimApp;
import android.app.Activity;
import android.graphics.drawable.AnimationDrawable;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
public class AnimAppActivity extends Activity {
    /** Called when the activity is first created. */

      Button btnStart,btnStop;
      ImageView img;
      AnimationDrawable animation;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        btnStart=(Button)findViewById(R.id.button1);
        btnStop=(Button)findViewById(R.id.button2);

        img=(ImageView)findViewById(R.id.imageView1);
        img.setBackgroundResource(R.anim.animation);
        animation=(AnimationDrawable)img.getBackground();

        btnStart.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
                   // TODO Auto-generated method stub
                   animation.start();
              }
        });

        btnStop.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
            // TODO Auto-generated method stub
            animation.stop();
            }
        });
    }
}

animation.xml

<?xml version="1.0" encoding="utf-8"?>
<animation-list
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:oneshot="false">
  <item android:drawable="@drawable/d1" android:duration="50"/>
  <item android:drawable="@drawable/d2" android:duration="50"/>
  <item android:drawable="@drawable/d3" android:duration="50"/>
</animation-list>

Note:

 

Layout is the same in both methods.

 

 

Summary

 

Frame by Frame animation is useful while you want it frame by frame with some interval.