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POAndroid very basic game development
 

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  1. POAndroid very basic game development
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    <p>Can anyone help me with this simple code? Why doesn't the circle move smoothly? What's wrong with it?</p> <pre><code>package chaseme; import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Point; import android.os.Bundle; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.Window; public class ChaseMe extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(new SampleView(this)); } private class SampleView extends SurfaceView implements SurfaceHolder.Callback, Runnable { private Point point; private Thread thread; private SurfaceHolder holder; private Paint _rect; private Paint _circle; private boolean running; private int WIDTH; private int HEIGHT; private float radius = 20; public SampleView(Context context) { super(context); point = new Point(20, 20); _rect = new Paint(); _rect.setColor(Color.BLACK); _circle = new Paint(); _circle.setColor(Color.BLUE); holder = this.getHolder(); holder.addCallback(this); thread = new Thread(this); } private void updateModel() { if(point.x &gt; WIDTH - radius) { point.x = 20; } if(point.y &gt; HEIGHT - radius) { point.y = 20; } point.x++; point.y++; } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {} @Override public void surfaceCreated(SurfaceHolder holder) { WIDTH = getWidth(); HEIGHT = getHeight(); this.setRunning(true); thread.start(); } @Override public void surfaceDestroyed(SurfaceHolder holder) { boolean retry = true; this.setRunning(false); while (retry) { try { thread.join(); retry = false; } catch (InterruptedException e) {} } } private void setRunning(boolean b) { running = b; } @Override public void run() { while(running) { Canvas c = null; updateModel(); try { c = holder.lockCanvas(null); // synchronized (holder) { render(c); // } } catch(Exception e) { Log.e("main", e.getMessage()); } finally { if(c!=null) { holder.unlockCanvasAndPost(c); } } } } private void render(Canvas c) { c.drawRect(0, 0, WIDTH, HEIGHT, _rect); c.drawCircle(point.x, point.y, radius , _circle); //c.save(); //c.restore(); } } } </code></pre>
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    1. COif you print some stuff in the console in render, is the frame rate good ? I wonder if your app is not running too fast as you never ask your thread to sleep between animation frames.
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    2. COWell, I know what is the problem, it is the emulator runs very slow, I ran a test to see the fps, and it drops from about 20 to 10.
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    3. COA device is only real world test on android. It's really the fastest way to debug an app also. I use the emulator only to test what my devices can't test (resolution, versions of sdk...). But usually I test my code on a device.
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