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PODetect Movement Accurately using Accelerometer in Android
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  1. PODetect Movement Accurately using Accelerometer in Android
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    copied!<p>I am implementing a demo TIMER, with Vibration ( at a particular condition ), When I press start my timer starts running.. and when I stop it using stop button, it simply stops. </p> <p>Now I have to integrate a functionality, when the person shifts the device <strong>(while the Timer is running)</strong>, it should reset the timer. It is working pretty good, but the accelerometer functionality is not working absolutely accurate. It needs a fast jerk to reset the timer.</p> <p>Suggest me a good solution for the same.</p> <p>Here is my code</p> <pre><code>public class SensorAccelerometer implements SensorEventListener { private Context context; private SensorManager sensorManager; private Sensor accelerometer; private TextView timelabel; private Handler mHandler; Runnable run; private float mLastX, mLastY, mLastZ; private final float NOISE = (float) 3.0; public SensorAccelerometer(Context context) { } public SensorAccelerometer(Context context,TextView timelabel, Handler mHandler2, Runnable mUpdateTimeTask) { // TODO Auto-generated constructor stub this.context = context; this.timelabel = timelabel; this.mHandler = mHandler2; this.run = mUpdateTimeTask; initialiseSensor(); } public void initialiseSensor(){ sensorManager = (SensorManager)context.getSystemService(Context.SENSOR_SERVICE); accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ALL); sensorManager.registerListener(this, accelerometer,SensorManager.SENSOR_DELAY_NORMAL); } public void unregisterSensor(){ sensorManager.unregisterListener(this); Toast.makeText(context, "Sensor Stopped..", Toast.LENGTH_SHORT).show(); } public void onAccuracyChanged(Sensor sensor, int accuracy) { } public void onSensorChanged(SensorEvent event) { float x = event.values[0]; float y = event.values[1]; float z = event.values[2]; mAccelLast=mAccelCurrent; mAccelCurrent = FloatMath.sqrt(x*x + y*y + z*z); float delta = mAccelCurrent - mAccelLast; mAccel = mAccel * 0.9f + delta; if(mAccel&gt;0.5){ TimerActivity.mStartTime = SystemClock.uptimeMillis(); mHandler.removeCallbacks(run); mHandler.postDelayed(run, 100); } </code></pre> <p>}</p> <p>Timer Activity</p> <pre><code>public class TimerActivity extends Activity { public static long mStartTime = 0L; private TextView mTimerLabel; private Handler mHandler = new Handler(); String timerStop1; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mTimerLabel = (TextView) findViewById(R.id.textTimer); Button timerStartButton = (Button) findViewById(R.id.btnTimer); timerStartButton.setOnClickListener(new View.OnClickListener() { public void onClick(View view){ if(mStartTime == 0L){ mStartTime = SystemClock.uptimeMillis(); mHandler.removeCallbacks(mUpdateTimeTask); mHandler.postDelayed(mUpdateTimeTask, 100); //activating the sensor and the acclerometer SensorAccelerometer acc = new SensorAccelerometer(view.getContext(), mTimerLabel,mHandler,mUpdateTimeTask); } } }); Button timerStopButton = (Button) findViewById(R.id.btnTimerStop); timerStopButton.setOnClickListener(new View.OnClickListener() { public void onClick(View view){ mHandler.removeCallbacks(mUpdateTimeTask); mTimerLabel.setText(timerStop1); mStartTime = 0L; SensorAccelerometer scc = new SensorAccelerometer(view.getContext(),mTimerLabel,mHandler,mUpdateTimeTask); scc.unregisterSensor(); } }); } private Runnable mUpdateTimeTask = new Runnable(){ public void run() { final long start = mStartTime; long millis = SystemClock.uptimeMillis()- start; int seconds = (int) (millis / 1000); int minutes = seconds / 60; seconds = seconds % 60; mTimerLabel.setText("" + minutes + ":" + String.format("%02d", seconds)); timerStop1 = minutes + ":" + String.format("%02d", seconds); mHandler.postDelayed(this, 200); } }; protected void onPause() { super.onPause(); SensorAccelerometer scc = new SensorAccelerometer(this,mTimerLabel,mHandler,mUpdateTimeTask); scc.unregisterSensor(); }; } </code></pre>
 

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