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POaccelerometer in android
 

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    <p>The following example is taken from internet. In all the example the code is explained using a seprate thread for sensor manager. Could you please let me know why all the accelerometer is explained with a seperate thread for SensorManager</p> <pre><code>package com.example.myapp1; import android.app.Activity; import android.app.Dialog; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.os.Bundle; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.widget.TextView; import android.widget.Toast; public class Accelerate extends Activity implements SensorEventListener { float x, y, sensorX, sensorY; Bitmap ball; SensorManager sm; Sensor s; MyBringBackSurface ourSurfaceView; public class MyBringBackSurface extends SurfaceView implements Runnable { SurfaceHolder ourHolder; Thread ourThread = null; boolean isRunning = false; public MyBringBackSurface(Context context) { super(context); Log.i("Notice","In constructor of mybringbacksurface"); ourHolder = getHolder(); } public void pause() { isRunning = false; Log.i("Notice","In pause of mybringbacksurface"); while (true) { try { ourThread.join(); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } break; } ourThread = null; } public void resume() { Log.i("Notice","In resume of mybringbacksurface"); isRunning = true; ourThread = new Thread(this); ourThread.start(); } public void run() { // TODO Auto-generated method stub Log.i("Notice","In run of mybringbacksurface"); while (isRunning) { if (!ourHolder.getSurface().isValid()) continue; Canvas canvas = ourHolder.lockCanvas(); canvas.drawRGB(02, 02, 150); float centerX = canvas.getWidth() / 2; float centerY = canvas.getHeight() / 2; canvas.drawBitmap(ball, centerX - sensorX * 18, centerY + sensorY * 18, null); ourHolder.unlockCanvasAndPost(canvas); } } } @Override protected void onCreate(Bundle savedInstanceState) { Log.i("Notice","In oncreate of of Accelerator"); // TODO Auto-generated method stub super.onCreate(savedInstanceState); sm = (SensorManager) getSystemService(Context.SENSOR_SERVICE); if (sm.getSensorList(Sensor.TYPE_ACCELEROMETER).size() != 0) { s = sm.getSensorList(Sensor.TYPE_ACCELEROMETER).get(0); sm.registerListener(this, s, SensorManager.SENSOR_DELAY_NORMAL); } ball = BitmapFactory.decodeResource(getResources(), R.drawable.greenball); x = y = sensorX = sensorY = 0; ourSurfaceView = new MyBringBackSurface(this); ourSurfaceView.resume(); setContentView(ourSurfaceView); } @Override protected void onPause() { // TODO Auto-generated method stub Log.i("Notice","In pause of Accelerator"); sm.unregisterListener(this, s); super.onPause(); ourSurfaceView.pause(); } public void onAccuracyChanged(Sensor arg0, int arg1) { // TODO Auto-generated method stub } public void onSensorChanged(SensorEvent e) { // TODO Auto-generated method stub Log.i("Notice","In sensorchanged of of Accelerator"); try { Thread.sleep(32); } catch (InterruptedException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } sensorX = e.values[0]; sensorY = e.values[1]; } } </code></pre>
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