CallSensor.java

package interdroid.swan.sensors.impl;

import interdroid.swan.R;
import interdroid.swan.sensors.AbstractConfigurationActivity;
import interdroid.swan.sensors.AbstractSwanSensor;
import android.os.Bundle;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.util.Log;

/**
 * Sensor for phone state.
 * 
 * @author nick <palmer@cs.vu.nl>
 * 
 */
public class CallSensor extends AbstractSwanSensor {
	private static final String TAG = "Call Sensor";
	
	/**
	 * The configuration activity for this sensor.
	 * 
	 * @author nick <palmer@cs.vu.nl>
	 * 
	 */
	public static class ConfigurationActivity extends
			AbstractConfigurationActivity {

		@Override
		public final int getPreferencesXML() {
			return R.xml.call_preferences;
		}
	}

	/**
	 * The call state.
	 */
	public static final String STATE_FIELD = "call_state";

	/**
	 * The phone number associated with the state if any.
	 */
	public static final String PHONE_NUMBER_FIELD = "phone_number";

	/**
	 * The telephony manager we use.
	 * */
	private TelephonyManager telephonyManager;

	/**
	 * The phone state listener which gets notified on call state changed.
	 */
	private PhoneStateListener phoneStateListener = new PhoneStateListener() {
		@Override
		public void onCallStateChanged(final int state, final String incomingNumber) {
			Log.d(TAG, "Call State: " + state + " " + incomingNumber);

			long now = System.currentTimeMillis();

			putValueTrimSize(STATE_FIELD, null, now, state);
			if (incomingNumber != null && incomingNumber.length() > 0) {
				putValueTrimSize(PHONE_NUMBER_FIELD, null, now, incomingNumber);
			}
		}
	};

	@Override
	public final String[] getValuePaths() {
		return new String[] { STATE_FIELD, PHONE_NUMBER_FIELD };
	}

	@Override
	public final void initDefaultConfiguration(final Bundle defaults) {
	}

	@Override
	public final void onConnected() {
		SENSOR_NAME = "Call Sensor";
	}

	@Override
	public final void register(final String id, final String valuePath,
			final Bundle configuration) {
		if (registeredConfigurations.size() == 1) {
			telephonyManager = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
			telephonyManager.listen(phoneStateListener,
					PhoneStateListener.LISTEN_CALL_STATE);
		}
	}

	@Override
	public final void unregister(final String id) {
		if (registeredConfigurations.size() == 0) {
			telephonyManager.listen(phoneStateListener,
					PhoneStateListener.LISTEN_NONE);
		}
	}

	@Override
	public void onDestroySensor() {
		super.onDestroySensor();
	}

}