Android Program to Demonstrate Simple Animation Activity

This Android Java Program lets you create a Simple Animation Application.

Here is source code of the Program to create an Activity to create a Simple Animation Application. The program is successfully compiled and run on a Windows system using Eclipse Ide. The program output is also shown below.

Main Activity

 
package com.example.animation_activity;
 
import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnTouchListener;
 
public class MainActivity extends Activity implements OnTouchListener{
 
    Ourview v;
    Bitmap bm , bitmap1;
    float x,y;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        v = new Ourview(this);
        v.setOnTouchListener(this);
        bm = BitmapFactory.decodeResource(getResources(), R.drawable.image4);
        bitmap1 = BitmapFactory.decodeResource(getResources(), R.drawable.mario2);
 
        x=0;y=0; 
        setContentView(v);
    }
 
    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        v.pause();
    }
 
    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        v.resume();
    }
 
    // surface view is going to be a thread now
    class Ourview extends SurfaceView implements Runnable {
 
        Thread th = null;
        SurfaceHolder holder;
        boolean var = false;
        sprite sprite_object;
        boolean sprite_loaded = false;
        public Ourview(Context context) {
            super(context);
            // TODO Auto-generated constructor stub
            holder = getHolder();
 
 
        }
 
        @Override
        public void run() {
            // TODO Auto-generated method stub
            sprite_object = new sprite(Ourview.this, bitmap1);
            while (var = true) {
                // do stuff
                if (!holder.getSurface().isValid()) {
                    continue;
                }
                if(!sprite_loaded){
                  sprite_loaded=true;
                }
                Canvas c = holder.lockCanvas();// while drawing on a canvas we
                                                // lock it and after drawing on
                                                // it we unlock it
                OnDraw(c);
                holder.unlockCanvasAndPost(c);
            }
        }
 
        @SuppressLint("WrongCall")
        void OnDraw(Canvas c){
            c.drawARGB(255, 250, 150, 20);//rgb values
            c.drawBitmap(bm, x -(bm.getWidth()/2), y -(bm.getHeight()/2), null );
            sprite_object.onDraw(c);
        }
 
        public void pause() {
 
            var = false;
            while (true) {
                try {
                    th.join();// would pause the currently executing thread till
                                // the user finishes its job
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                break;
            }
            th = null;
        }
 
        public void resume() {
            var = true;
            th = new Thread(this);
            th.start();
        }
    }
 
    @Override
    public boolean onTouch(View v, MotionEvent me) {
        // TODO Auto-generated method stub
 
        //x=me.getX();//ontouch listener
        //y=me.getY();
 
        try {
            Thread.sleep(80);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        switch (me.getAction()) {
        case MotionEvent.ACTION_DOWN:
            x= me.getX();
            y=me.getY();
            break;
 
        case MotionEvent.ACTION_UP:
            x= me.getX();
            y=me.getY();
            break;
 
        case MotionEvent.ACTION_MOVE:
            x= me.getX();
            y=me.getY();
            break;
 
        default:
            break;
        }
 
        return true;
    }
 
}

sprite

 
package com.example.animation_activity;
 
import com.example.animation_activity.MainActivity.Ourview;
 
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Rect;
 
public class sprite {
 
    int x,y,xspeed,yspeed,height,width;
    Bitmap b;
    Ourview our_view;
    int current_frame=0,direction=1;
    public sprite(Ourview ourview, Bitmap bitmap1) {
        // TODO Auto-generated constructor stub
        b=bitmap1;
        our_view=ourview;
        //4 rows
        height =b.getHeight()/4;
        //6 columns
        width = b.getWidth()/6;
        x=y=0;
        xspeed=30;
        yspeed=0;
    }
 
    public void onDraw(Canvas c) {
        // TODO Auto-generated method stub
        update();
        int srcy=direction*height;
        Rect src = new Rect(0, srcy, width,srcy+ height);
        Rect dst = new Rect(x,y,x+width,y+height); 
        c.drawBitmap(b,src, dst, null);
 
    }
 
    private void update() {
        // TODO Auto-generated method stub
        //1 right
        //3 left
        //down 2
        //up 0
 
        //facing down
        if(x>our_view.getWidth() -width -xspeed){
            xspeed=0;
            yspeed=30;
            direction=2;
        }
 
        //left
        if(y>our_view.getHeight() - height -yspeed){
            xspeed=-30;
            yspeed=0;
            direction=3;
        }
 
        //up
        if(x+xspeed<0){
            x=0;
            xspeed=0;
            yspeed=-30;
            direction=0;
        }
 
        //right
        if(y+yspeed<0){
            y=0;
            xspeed=30;
            yspeed=0;
            direction=1;
        }
        current_frame=++current_frame%6;
        x+=xspeed;
        y+=yspeed;
    }
 
}

Capture

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Get full code here-
Simple_Animation_Activity

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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