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POSensor data choppy on Sony devices
 

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  1. POSensor data choppy on Sony devices
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    <p>For the past few days I've been playing around with sensors and canvas.</p> <p>So far I've managed to control the location of a bitmap based on device's angles.</p> <p>The way app works is it gets orientation data, and depending on how much the device is tilted, it moves the bitmap left or right on the screen.</p> <p>I do most of my testing on my Samsung Galaxy S II GT-i9100 running android 4.2.2 (AOKP), and the app works pretty much flawlessly, apart from the app crashing when resuming it (I think I know what's causing that).</p> <p>The problem I'm having is as follows:</p> <p>When I try running the same code on a Sony Xperia Z (running android 4.1.2, stock from Sony) the whole app becomes choppy (the bitmap barely moves), and I think it's because the sensor data retrieval is choppy/slow. Same happens on my friend's Sony Xperia S.</p> <p>I gave the app to my other friend who has a Nexus 4, he says he has no such problems.</p> <p><strong>GameView</strong></p> <pre><code>public class GameView extends SurfaceView { private Bitmap bmp; private SurfaceHolder holder; private GameLoopThread gameLoopThread; private int x = 0; private int xMultiplier = 0; private Paint textPaint; //lowPass private float smoothVal = 0; //Main variable, check algorithm private int smoothing = 5; //How strong the smoothing is, larger the value, more time is needed before the value reaches actual sensor value //Sensors private SensorManager sensorManager; private SensorEventListener sensorEventListener; //Rotation matrices for converting coordinate systems private float[] rotationMatrixR = new float[9]; private float[] rotationMatrixI = new float[9]; //Arrays storing data for gravity and geomagnetic data needed to get device's angles private float[] gravity = new float[3]; private float[] geomagnetic = new float[3]; //Array holding angles private float[] angles = new float[3]; public GameView(Context context) { super(context); gameLoopThread = new GameLoopThread(this); holder = getHolder(); textPaint = new Paint(); textPaint.setColor(Color.WHITE); textPaint.setTextSize(20); sensorManager = (SensorManager)getContext().getSystemService(Context.SENSOR_SERVICE); sensorEventListener = new SensorEventListener() { @Override public void onSensorChanged(SensorEvent sensorEvent) { Sensor sensor = sensorEvent.sensor; if (sensor.getType() == Sensor.TYPE_ACCELEROMETER) { gravity = sensorEvent.values; } else if (sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) { geomagnetic = sensorEvent.values; } SensorManager.getRotationMatrix(rotationMatrixR, rotationMatrixI, gravity, geomagnetic); SensorManager.getOrientation(rotationMatrixR, angles); } @Override public void onAccuracyChanged(Sensor sensor, int i) { } }; sensorManager.registerListener(sensorEventListener, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_FASTEST); sensorManager.registerListener(sensorEventListener, sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD), SensorManager.SENSOR_DELAY_FASTEST); holder.addCallback(new SurfaceHolder.Callback() { @Override public void surfaceDestroyed(SurfaceHolder holder) { boolean retry = true; gameLoopThread.setRunning(false); while (retry) { try { gameLoopThread.join(); retry = false; } catch (InterruptedException e) { //Shit hit the fan Log.e("GameLoopThread", e.toString()); } } } @Override public void surfaceCreated(SurfaceHolder holder){ gameLoopThread.setRunning(true); gameLoopThread.start(); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } }); bmp = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher); } @Override protected void onDraw(Canvas canvas) { x = (int) ((canvas.getWidth() / 100) * ((lowPass(angles[2]) * 100) + 50)); canvas.drawColor(Color.DKGRAY); //This also clears the screen canvas.drawBitmap(bmp, x, canvas.getHeight() - bmp.getHeight() - 20, null); canvas.drawText("Azimuth (Z): " + Float.toString(angles[0]),25,25, textPaint); canvas.drawText("Pitch (X): " + Float.toString(angles[1]),25,45, textPaint); canvas.drawText("Roll (Y): " + Float.toString(angles[2]),25,65, textPaint); canvas.drawText("X: " + Integer.toString(x),25,85,textPaint); } public static BigDecimal roundFloat(float d, int decimalPlace) { BigDecimal bd = new BigDecimal(Float.toString(d)); bd = bd.setScale(decimalPlace, BigDecimal.ROUND_HALF_UP); return bd; } private float lowPass(float curValue) { smoothVal += (curValue - smoothVal) / smoothing; return smoothVal; } } </code></pre> <p><strong>GameLoopThread</strong></p> <pre><code>public class GameLoopThread extends Thread { static final long FPS = 25; private GameView view; private Boolean running = false; public GameLoopThread(GameView view){ this.view = view; } public void setRunning(boolean run){ running = run; } @Override public void run(){ long tickPS = 1000/FPS; long startTime; long sleepTime; while(running){ Canvas c = null; startTime = System.currentTimeMillis(); try { c = view.getHolder().lockCanvas(); synchronized (view.getHolder()){ view.onDraw(c); } } catch (NullPointerException e) { Log.e("GameLoopThread", e.toString()); } finally { if (c != null) { view.getHolder().unlockCanvasAndPost(c); } } sleepTime = tickPS - (System.currentTimeMillis() - startTime); try { if (sleepTime &gt; 0) { sleep(sleepTime); } else { sleep(10); } } catch (Exception e) { Log.e("GameLoopThread", e.toString()); } } } } </code></pre>
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    1. COTry copying the values out of the `SensorEvent` to your arrays one by one.
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