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Frame By Frame Animation | 2D Animation - Android Example

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In this example showing frame by frame animation (2D Animation).
Draw 18 images after some time frame by frame .

 

Project Structure :

 

2d animation frame by frame animation project sketch

 

File:  src/AnimationMain.java

- Call animation class and call loadAnimation method to initialize animation images.
- Call playAnimation method to play images frame by frame.

 


import com.androidexample.animation.R;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class AnimationMain extends Activity {

	
	AnimationView anim_view;
	AnimationView anim_view1;
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.animatewin);
        
        // Get AnimationView reference see animation_main.xml
        anim_view = (AnimationView) this.findViewById(R.id.anim_view);
        anim_view.loadAnimation("spark", 18,0,0);
        
        // Get AnimationView reference see animation_main.xml
        anim_view1 = (AnimationView) this.findViewById(R.id.anim_view1);
        
        // You can call this method inside thread
        anim_view1.loadAnimation("spark", 18,0,0);
      
        Button play_button = (Button) this.findViewById(R.id.play_button);
        
        
        play_button.setOnClickListener(new OnClickListener() {
			public void onClick(View v) {
				
				//Play Both Animation
				anim_view.playAnimation();
		        anim_view1.playAnimation();
				 
			}
		}); 
        
    }
    
    @Override
    protected void onDestroy() {
    	
        super.onDestroy();
        
        // After activity close animation will close
        anim_view=null;
        anim_view1=null;
        
    }
    
}

 

File : res/layout/animation_main.xml

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="fill_parent"    
     android:layout_height="fill_parent"
     android:orientation="vertical"
     android:background="#000000"
    >

    
    <TextView 
         android:textColor="#ffffff"
	     android:textSize="25px"
	     android:layout_width="fill_parent"    
         android:layout_height="wrap_content"
		 android:text="Play Two Animations"
		 android:textStyle="bold"
		 android:layout_gravity="center_vertical|center_horizontal" 
		/>
    
    <Button 
        android:id="@+id/play_button"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="PLAY ANIMATION" />
    
   <LinearLayout 
     android:layout_width="fill_parent"
    android:layout_height="150dip"
    >  
         
	    <com.androidexample.animation.AnimationView  
	        android:id="@+id/anim_view"
	        android:layout_width="150dip" 
	        android:layout_height="150dip"  />
	        
	    <com.androidexample.animation.AnimationView  
	        android:id="@+id/anim_view1"
	        android:layout_width="150dip" 
	        android:layout_height="150dip" />
    
   </LinearLayout>
   	
   
</LinearLayout>



 

File:  src/AnimationView.java

 

- It is the main animation class.
- Create AnimationView class object to animate image.
- Call postInvalidate() method to call onDraw() method.

 


import java.util.ArrayList;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.ImageView;


public class AnimationView extends ImageView
{
	private static final String TAG = "AnimationView";
	private Context mContext = null;
	
	private static final int DELAY = 100; //delay between frames in milliseconds
	private  int drawX = 0;
	private  int drawY = 0;
	
	private boolean mIsPlaying = false;
	private boolean mStartPlaying = false;
	
	private ArrayList<Bitmap> mBitmapList = new ArrayList<Bitmap>();
	
	private int play_frame = 0;
    private long last_tick = 0;
    
    public AnimationView(Context context, AttributeSet attrs)
    {
    	super(context, attrs);
    	mContext = context;
    }
    
    @Override
    protected void onDraw(Canvas c)
    {
    	/******* onDraw method called first time and when postInvalidate() called *****/
        
    	//Log.d(TAG, "onDraw called");
        if (mStartPlaying)
        {
            Log.d(TAG, "starting animation...");
            play_frame = 0;
            mStartPlaying = false;
            mIsPlaying = true;
            
            // Again call onDraw method
            postInvalidate();
        }
        else if (mIsPlaying)
        {
            
            if (play_frame >= mBitmapList.size())
            {
                //mIsPlaying = false;
                play_frame=0;
                
                // Again call onDraw method
                postInvalidate();
            }
            else
            {
                long time = (System.currentTimeMillis() - last_tick);
                
                int draw_x = drawX;
                int draw_y = drawY;
                if (time >= DELAY) //the delay time has passed. set next frame
                {
                    last_tick = System.currentTimeMillis();
                    c.drawBitmap(mBitmapList.get(play_frame), draw_x, draw_y, null);
                    play_frame++;
                    
                    // Again call onDraw method
                    postInvalidate();
                }
                else //still within delay.  redraw current frame
                {
                    c.drawBitmap(mBitmapList.get(play_frame), draw_x, draw_y, null);
                    
                    // Again call onDraw method
                    postInvalidate();
                }
            }
        }
    }
    
    /*ideally this should be in a background thread*/
    public void loadAnimation(String prefix, int nframes,int drawx,int drawy)
    {
    	drawX = drawx;
    	drawY = drawy;
    	mBitmapList.clear();
    	
        for (int x = 0; x < nframes; x++)
        {
        	String name = prefix + "" + x;  // prefix = "spark" see loadAnimation call
        	
        	//Log.d(TAG, "loading animation frame: " + name);
        	
        	// Set Bitmap image
        	int res_id = mContext.getResources().getIdentifier(name, "drawable", mContext.getPackageName());
        	BitmapDrawable d = (BitmapDrawable) mContext.getResources().getDrawable(res_id);
        	mBitmapList.add(d.getBitmap());
        }
    }
    
    public void playAnimation()
    {
    	mStartPlaying = true;
    	
    	// Again call onDraw method
    	postInvalidate();
    }
}

 

File : AndroidManifest.xml

 


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.androidexample.animation"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="8" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.androidexample.animation.AnimationMain"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

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