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Handling Shake Events on Android 1.5

/ Published in: Java
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  1. package com.gedankentank.android.sensor;
  2.  
  3. import java.util.List;
  4.  
  5. import android.hardware.Sensor;
  6. import android.hardware.SensorEvent;
  7. import android.hardware.SensorEventListener;
  8. import android.hardware.SensorManager;
  9. import android.util.Log;
  10.  
  11. public class AccelerometerListener implements SensorEventListener {
  12.  
  13. 	private SensorManager sensorManager;
  14. 	private List<Sensor> sensors;
  15. 	private Sensor sensor;
  16. 	private long lastUpdate = -1;
  17. 	private long currentTime = -1;
  18.  
  19. 	private float last_x, last_y, last_z;
  20. 	private float current_x, current_y, current_z, currenForce;
  21. 	private static final int FORCE_THRESHOLD = 900;
  22. 	private final int DATA_X = SensorManager.DATA_X;
  23. 	private final int DATA_Y = SensorManager.DATA_Y;
  24. 	private final int DATA_Z = SensorManager.DATA_Z;
  25.  
  26. 	public AccelerometerListener(Activity parent) {
  27. 		SensorManager sensorService = (SensorManager) parent.getSystemService(Context.SENSOR_SERVICE);
  28. 		this.sensorManager = sensorManager;
  29. 		this.subscriber = subscriber;
  30. 		this.sensors = sensorManager.getSensorList(Sensor.TYPE_ACCELEROMETER);
  31. 		if (sensors.size() > 0) {
  32.             sensor = sensors.get(0);
  33.         }
  34. 	}
  35. 	public void start () {
  36. 		if (sensor!=null)  {
  37. 			sensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_GAME);
  38. 		}
  39. 	}
  40.  
  41. 	public void stop () {
  42. 		sensorManager.unregisterListener(this);
  43. 	}
  44.  
  45. 	public void onAccuracyChanged(Sensor s, int valu) {
  46.  
  47.  
  48. 	}
  49. 	public void onSensorChanged(SensorEvent event) {
  50.  
  51. 		if (event.sensor.getType() != Sensor.TYPE_ACCELEROMETER || event.values.length < 3)
  52. 		      return;
  53.  
  54. 		currentTime = System.currentTimeMillis();
  55.  
  56. 		if ((currentTime - lastUpdate) > 100) {
  57. 			long diffTime = (currentTime - lastUpdate);
  58. 			lastUpdate = currentTime;
  59.  
  60. 			current_x = event.values[DATA_X];
  61. 			current_y = event.values[DATA_Y];
  62. 			current_z = event.values[DATA_Z];
  63.  
  64. 			currenForce = Math.abs(current_x+current_y+current_z - last_x - last_y - last_z) / diffTime * 10000;
  65.  
  66. 			if (currenForce > FORCE_THRESHOLD) {
  67.  
  68. 				// Device has been shaken now go on and do something
  69. 				// you could now inform the parent activity ...
  70.  
  71. 			}
  72. 			last_x = current_x;
  73. 			last_y = current_y;
  74. 			last_z = current_z;
  75.  
  76. 		}
  77. 	}
  78.  
  79. }

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