Java 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;
}

}