Handling shake events
package com.gedankentank.android.sensor;
import java.util.List;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.util.Log;
public class AccelerometerListener implements SensorEventListener {
private SensorManager sensorManager;
private List<Sensor> sensors;
private Sensor sensor;
private long lastUpdate = -1;
private long currentTime = -1;
private float last_x, last_y, last_z;
private float current_x, current_y, current_z, currenForce;
private static final int FORCE_THRESHOLD = 900;
private final int DATA_X = SensorManager.DATA_X;
private final int DATA_Y = SensorManager.DATA_Y;
private final int DATA_Z = SensorManager.DATA_Z;
public AccelerometerListener(Activity parent) {
SensorManager sensorService = (SensorManager) parent.getSystemService(Context.SENSOR_SERVICE);
this.sensorManager = sensorManager;
this.subscriber = subscriber;
this.sensors = sensorManager.getSensorList(Sensor.TYPE_ACCELEROMETER);
if (sensors.size() > 0) {
sensor = sensors.get(0);
}
}
public void start () {
if (sensor!=null) {
sensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_GAME);
}
}
public void stop () {
sensorManager.unregisterListener(this);
}
public void onAccuracyChanged(Sensor s, int valu) {
}
public void onSensorChanged(SensorEvent event) {
if (event.sensor.getType() != Sensor.TYPE_ACCELEROMETER || event.values.length < 3)
return;
currentTime = System.currentTimeMillis();
if ((currentTime - lastUpdate) > 100) {
long diffTime = (currentTime - lastUpdate);
lastUpdate = currentTime;
current_x = event.values[DATA_X];
current_y = event.values[DATA_Y];
current_z = event.values[DATA_Z];
currenForce = Math.abs(current_x+current_y+current_z - last_x - last_y - last_z) / diffTime * 10000;
if (currenForce > FORCE_THRESHOLD) {
// Device has been shaken now go on and do something
// you could now inform the parent activity …
}
last_x = current_x;
last_y = current_y;
last_z = current_z;
}
}
}
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