Question

Hi after everytime something is destroyed in my game i create a new object of an explosion animation done by the use of a thread class inside my surface view thread. After destroying multiple ships in a short period of time the app exits the activity. Why is this?

explosion ex = new explosion(x,y);
ex.start();

and

class explosion extends Thread implements Runnable{

    private long startTime;
    private int num = 0;
    private int x;
    private int y;
    public explosion(int mx, int my){
        x = mx;
        y = my;
        startTime = System.currentTimeMillis();
    }
    public void run(){
        while(num < 3){
            long millis = System.currentTimeMillis();
            canvas.drawBitmap(explosions.get(num),x,y,null);
            if(millis - startTime > 50){
                startTime = System.currentTimeMillis();
                num++;
                Log.d("Explosion","Animate");
            }
        }
        Log.d("Explosion","End Thread");
    }
};

Answer 1

Copied from developer.android…

Regardless of whether or not you use AsyncTask, always remember these
two rules about the single thread model:

-Do not block the UI thread,

-and Make sure that you access the AndroidUI toolkit only on the UI
thread.

I believe this line is causing you to crash…

canvas.drawBitmap(explosions.get(num),x,y,null);

This link details the steps to update UI on another thread:

http://developer.android.com/resources/articles/painless-threading.html