SignalStrengthSensor.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.SignalStrength;
import android.telephony.TelephonyManager;
import android.util.Log;

public class SignalStrengthSensor extends AbstractSwanSensor {
	private static final String TAG = "SignalStrengthSensor";

	/**
	 * 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.gsm_preferences;
		}

	}

	/**
	 * The gsm signal strength field.
	 */
	public static final String GSM_SIGNAL_STRENGTH_FIELD = "gsm_signal_strength";

	/**
	 * Is this a gsm or cdma reading?
	 */
	public static final String IS_GSM_FIELD = "is_gsm";

	/**
	 * The gsm bit error rate field.
	 */
	public static final String GSM_BIT_ERROR_RATE_FIELD = "gsm_bit_error_rate";

	/**
	 * The cdma dbm field.
	 */
	public static final String CDMA_DBM_FIELD = "cdma_dbm";

	/**
	 * The cdma EC/IO value in dB*10
	 */
	public static final String CDMA_ECIO_FIELD = "cdma_ecio";

	/**
	 * The evdo dbm field.
	 */
	public static final String EVDO_DBM_FIELD = "evdo_dbm";

	/**
	 * The evdo EC/IO value in dB*10
	 */
	public static final String EVDO_ECIO_FIELD = "evdo_ecio";

	/**
	 * The evdo signal to noise field.
	 */
	public static final String EVDO_SNR_FIELD = "evdo_snr";

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

	/**
	 * The phone state listener we use.
	 */
	private PhoneStateListener phoneStateListener = new PhoneStateListener() {

		@Override
		public void onSignalStrengthsChanged(SignalStrength signalStrength) {
			long now = System.currentTimeMillis();
			if (signalStrength.isGsm()) {
				Log.d(TAG,
						"GSM Signal Strength: "
								+ signalStrength.getGsmSignalStrength() + ", "
								+ signalStrength.getGsmBitErrorRate());
			} else {
				Log.d(TAG,
						"CDMA Signal Strength: " + signalStrength.getCdmaDbm()
								+ ", " + signalStrength.getCdmaEcio());
			}

			putValueTrimSize(IS_GSM_FIELD, null, now, signalStrength.isGsm());
			putValueTrimSize(GSM_SIGNAL_STRENGTH_FIELD, null, now, signalStrength.getGsmSignalStrength());
			putValueTrimSize(GSM_BIT_ERROR_RATE_FIELD, null, now, signalStrength.getGsmBitErrorRate());
			putValueTrimSize(CDMA_DBM_FIELD, null, now, signalStrength.getCdmaDbm());
			putValueTrimSize(CDMA_ECIO_FIELD, null, now, signalStrength.getCdmaEcio());
			putValueTrimSize(EVDO_DBM_FIELD, null, now, signalStrength.getEvdoDbm());
			putValueTrimSize(EVDO_ECIO_FIELD, null, now, signalStrength.getEvdoEcio());
			putValueTrimSize(EVDO_SNR_FIELD, null, now, signalStrength.getEvdoSnr());
		}
	};

	@Override
	public final String[] getValuePaths() {
		return new String[] { IS_GSM_FIELD, GSM_SIGNAL_STRENGTH_FIELD,
				GSM_BIT_ERROR_RATE_FIELD, CDMA_DBM_FIELD, CDMA_ECIO_FIELD,
				EVDO_DBM_FIELD, EVDO_ECIO_FIELD, EVDO_SNR_FIELD };
	}

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

	@Override
	public final void onConnected() {
		SENSOR_NAME = "Signal Strength 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_SIGNAL_STRENGTHS);
		}
	}

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

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

}