BackgroundService.java :  » UnTagged » amarino » at » abraxas » amarino » plugins » accelerometer » Android Open Source

package at.abraxas.amarino.plugins.accelerometer;

import java.util.List;

import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.preference.PreferenceManager;
import android.util.Log;
import android.widget.Toast;
import at.abraxas.amarino.Amarino;
import at.abraxas.amarino.plugins.AbstractPluginService;

public class BackgroundService extends AbstractPluginService
      implements SensorEventListener, OnSharedPreferenceChangeListener {
  
  private static final String TAG = "Accelerometer Plugin";

  private SensorManager sm;
  private Sensor accelerometerSensor;
  private int frequency;
  private int ignoreThreshold = 0;
  private int ignoreCounter = 0;


  @Override
  public void init() {
    if (!pluginEnabled){
      /* here should be your specific initialization code */
      
      SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
      frequency = prefs.getInt(EditActivity.PREF_FREQUENCY, 50);
      pluginId = prefs.getInt(EditActivity.KEY_PLUGIN_ID, -1);
      ignoreThreshold = EditActivity.getRate(frequency);
      
      prefs.registerOnSharedPreferenceChangeListener(this);
    
      // make sure not to call it twice
      sm = (SensorManager) getSystemService(SENSOR_SERVICE);
      List<Sensor> sensors = sm.getSensorList(Sensor.TYPE_ACCELEROMETER);
      if (sensors != null && sensors.size() > 0) {
        accelerometerSensor = sensors.get(0);
        sm.registerListener(this, accelerometerSensor, SensorManager.SENSOR_DELAY_UI);
        pluginEnabled = true;
      }
      else {
        Toast.makeText(this, "Accelerometer sensor is not available on this device!", Toast.LENGTH_SHORT).show();
      }
    }
  }


  @Override
  public void onDestroy() {
    if (pluginEnabled){
      sm.unregisterListener(this);
      PreferenceManager.getDefaultSharedPreferences(this).unregisterOnSharedPreferenceChangeListener(this);
    }
    super.onDestroy();
  }

  @Override
  public void onAccuracyChanged(Sensor sensor, int accuracy) {
    // we don't need this
  }

  @Override
  public void onSensorChanged(SensorEvent event) {
    if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER){
      
      if (ignoreCounter >= ignoreThreshold) {
        ignoreCounter = 0;
        
        if (DEBUG) Log.d(TAG, "send: x:" + event.values[0] + " y:" + event.values[1] + " z: " + event.values[2]);
        Amarino.sendDataFromPlugin(this, pluginId, event.values.clone());
      }
      else {
        ignoreCounter++;
      }
    }
  }


  @Override
  public void onSharedPreferenceChanged(SharedPreferences prefs,
      String key) {
    if (EditActivity.PREF_FREQUENCY.equals(key)){
      ignoreThreshold = EditActivity.getRate(prefs.getInt(key, 50));
    }
  }

  @Override
  public String getTAG() {
    return TAG;
  }

  
}