GameView.java

package com.xerpi.core;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.Display;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.WindowManager;

public class GameView extends SurfaceView implements OnTouchListener {

    private GameLoopThread gameLoopThread;
    private SurfaceHolder holder;
    Paint paint = new Paint();
    Display display = ((WindowManager)getContext().getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
    public float screenW = display.getWidth();
    public float screenH = display.getHeight();
    public float centerX = screenW/2;
    public float centerY = screenH/2;
    public Bitmap imgArc = BitmapFactory.decodeResource(this.getResources(),R.drawable.arc);
    public Bitmap imgBall1 = BitmapFactory.decodeResource(this.getResources(),R.drawable.ball1);
    public static Core core = new Core(screenW,screenH,imgArc);
    Balls balls = new Balls();

    public boolean checkCollision(float x, float y, float w, float h, float x2,
            float y2, float w2, float h2) {
        if (x + w >= x2 && x <= x2 + w2 && y + h >= y2 && y <= y2 + h2) {
            return true;
        }
        return false;
    }

    public GameView(Context context) {
        super(context);
        gameLoopThread = new GameLoopThread(this);
        holder = getHolder();
        holder.addCallback(new Callback() {
            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
                gameLoopThread.setRunning(false);
            }

            @Override
            public void surfaceCreated(SurfaceHolder holder) {

                for (int i =0;i<500;i++)
                balls.add(0,imgBall1);
                gameLoopThread.setRunning(true);
                gameLoopThread.start();
            }

            @Override
            public void surfaceChanged(SurfaceHolder holder, int format,
                    int width, int height) {
            }
        });
    }



    public void onDraw(Canvas canvas) {
        // Clear the screen
            canvas.drawColor(Color.BLACK);
            this.setOnTouchListener(this);
        paint.setColor(Color.RED);
        paint.setTextSize(20);
        canvas.drawText("Score: "+core.score, 10, 20, paint);
        core.blit(canvas,paint);
        balls.move();
        balls.blit(canvas,paint);
        paint.reset();
    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        double ang = -Math.atan2(screenW/2-event.getX(),screenH/2-event.getY());
        core.setAngle((float) Math.toDegrees(ang));
        return true;
    }

}