Keeping Temp value in the service

app/src/main/java/no/nordicsemi/android/nrftoolbox/hts/HTSActivity.java

@@ -51,11 +51,9 @@ public class HTSActivity extends BleProfileServiceReadyActivity<HTSService.HTSBi
 	@SuppressWarnings("unused")
 	private final String TAG = "HTSActivity";
 
-	private static final String VALUE = "value";
 	private TextView mTempValue;
 	private TextView mUnit;
 	private TextView mBatteryLevelView;
-	private Float mValueC;
 
 	@Override
 	protected void onCreateView(final Bundle savedInstanceState) {
@@ -63,22 +61,9 @@ public class HTSActivity extends BleProfileServiceReadyActivity<HTSService.HTSBi
 		setGUI();
 	}
 
-	@Override
-	protected void onSaveInstanceState(final Bundle outState) {
-		super.onSaveInstanceState(outState);
-
-		if (mValueC != null)
-			outState.putDouble(VALUE, mValueC);
-	}
-
 	@Override
 	protected void onInitialize(final Bundle savedInstanceState) {
 		LocalBroadcastManager.getInstance(this).registerReceiver(mBroadcastReceiver, makeIntentFilter());
-
-		if (savedInstanceState != null) {
-			if (savedInstanceState.containsKey(VALUE))
-				mValueC = savedInstanceState.getFloat(VALUE);
-		}
 	}
 
 	@Override
@@ -91,9 +76,6 @@ public class HTSActivity extends BleProfileServiceReadyActivity<HTSService.HTSBi
 		mTempValue = findViewById(R.id.text_hts_value);
 		mUnit = findViewById(R.id.text_hts_unit);
 		mBatteryLevelView = findViewById(R.id.battery);
-
-		if (mValueC != null)
-			mTempValue.setText(String.valueOf(mValueC));
 	}
 
 	@Override
@@ -104,7 +86,6 @@ public class HTSActivity extends BleProfileServiceReadyActivity<HTSService.HTSBi
 
 	@Override
 	protected void setDefaultUI() {
-		mValueC = null;
 		mTempValue.setText(R.string.not_available_value);
 		mBatteryLevelView.setText(R.string.not_available);
 
@@ -126,13 +107,11 @@ public class HTSActivity extends BleProfileServiceReadyActivity<HTSService.HTSBi
 				mUnit.setText(R.string.hts_unit_kelvin);
 				break;
 		}
-		if (mValueC != null)
-			onTemperatureMeasurementReceived(mValueC);
 	}
 
 	@Override
 	protected void onServiceBound(final HTSService.HTSBinder binder) {
-		// not used
+		onTemperatureMeasurementReceived(binder.getTemperature());
 	}
 
 	@Override
@@ -193,22 +172,26 @@ public class HTSActivity extends BleProfileServiceReadyActivity<HTSService.HTSBi
 		mBatteryLevelView.setText(R.string.not_available);
 	}
 
-	private void onTemperatureMeasurementReceived(float value) {
+	private void onTemperatureMeasurementReceived(Float value) {
-		mValueC = value;
+		if (value != null) {
 			final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
-		final int unit = Integer.parseInt(preferences.getString(SettingsFragment.SETTINGS_UNIT, String.valueOf(SettingsFragment.SETTINGS_UNIT_DEFAULT)));
+			final int unit = Integer.parseInt(preferences.getString(SettingsFragment.SETTINGS_UNIT,
+					String.valueOf(SettingsFragment.SETTINGS_UNIT_DEFAULT)));
 
 			switch (unit) {
 				case SettingsFragment.SETTINGS_UNIT_F:
 					value = value * 1.8f + 32f;
 					break;
 				case SettingsFragment.SETTINGS_UNIT_K:
-				value += 273.15;
+					value += 273.15f;
 					break;
 				case SettingsFragment.SETTINGS_UNIT_C:
 					break;
 			}
 			mTempValue.setText(getString(R.string.hts_value, value));
+		} else {
+			mTempValue.setText(R.string.not_available_value);
+		}
 	}
 
 	public void onBatteryLevelChanged(final int value) {

app/src/main/java/no/nordicsemi/android/nrftoolbox/hts/HTSService.java

@@ -58,6 +58,8 @@ public class HTSService extends BleProfileService implements HTSManagerCallbacks
 	private final static int NOTIFICATION_ID = 267;
 	private final static int OPEN_ACTIVITY_REQ = 0;
 	private final static int DISCONNECT_REQ = 1;
+	/** The last received temperature value in Celsius degrees. */
+	private Float mTemp;
 
 	@SuppressWarnings("unused")
 	private HTSManager mManager;
@@ -68,7 +70,14 @@ public class HTSService extends BleProfileService implements HTSManagerCallbacks
 	 * This local binder is an interface for the bonded activity to operate with the HTS sensor
 	 */
 	class HTSBinder extends LocalBinder {
-		// empty
+		/**
+		 * Returns the last received temperature value.
+		 *
+		 * @return Temperature value in Celsius.
+		 */
+		Float getTemperature() {
+			return mTemp;
+		}
 	}
 
 	@Override
@@ -111,14 +120,22 @@ public class HTSService extends BleProfileService implements HTSManagerCallbacks
 		createNotification(R.string.hts_notification_connected_message, 0);
 	}
 
+	@Override
+	public void onDeviceDisconnected(final BluetoothDevice device) {
+		super.onDeviceDisconnected(device);
+		mTemp = null;
+	}
+
 	@Override
 	public void onTemperatureMeasurementReceived(@NonNull final BluetoothDevice device,
 												 final float temperature, final int unit,
 												 @Nullable final Calendar calendar,
 												 @Nullable final Integer type) {
+		mTemp = TemperatureMeasurementCallback.toCelsius(temperature, unit);
+
 		final Intent broadcast = new Intent(BROADCAST_HTS_MEASUREMENT);
 		broadcast.putExtra(EXTRA_DEVICE, getBluetoothDevice());
-		broadcast.putExtra(EXTRA_TEMPERATURE, TemperatureMeasurementCallback.toCelsius(temperature, unit));
+		broadcast.putExtra(EXTRA_TEMPERATURE, mTemp);
 		// ignore the rest
 		LocalBroadcastManager.getInstance(this).sendBroadcast(broadcast);