Android Program to Draw a Spritesheet on a Canvas

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This Android Program lets you create an Activity to Draw on a Spritesheet on a Canvas using Java.

Here is source code of the Program to Draw a Spritesheet on a Canvas. 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.spritesheet_on_canvas;
 
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.anime);
 
        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
            while (var = true) {
                // do stuff
                if (!holder.getSurface().isValid()) {
                    continue;
                }
                if(!sprite_loaded){
                  sprite_object = new sprite(this,bitmap1);
                  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.spritesheet_on_canvas;
 
import com.example.spritesheet_on_canvas.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;
    public sprite(Ourview ourview, Bitmap bitmap1) {
        // TODO Auto-generated constructor stub
        b=bitmap1;
        our_view=ourview;
        height =b.getHeight();
        width = b.getWidth();
        x=y=0;
        xspeed=5;
        yspeed=0;
    }
 
    public void onDraw(Canvas c) {
        // TODO Auto-generated method stub
        update();
        Rect src = new Rect(0, 0, width, 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
        x+=xspeed;
        y+=yspeed;
    }
 
}

Xml

Main

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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />
 
</RelativeLayout>

AndroidManifest

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.spritesheet_on_canvas"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="17" />
 
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.spritesheet_on_canvas.MainActivity"
            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>

Capture

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