Merge branch 'develop' of https://github.com/NordicSemiconductor/Android-nRF-Toolbox into develop

app/src/main/java/no/nordicsemi/android/nrftoolbox/battery/BatteryManager.java

@@ -27,6 +27,8 @@ public abstract class BatteryManager<T extends BatteryManagerCallbacks> extends
 	private final static UUID BATTERY_LEVEL_CHARACTERISTIC_UUID = UUID.fromString("00002A19-0000-1000-8000-00805f9b34fb");
 
 	private BluetoothGattCharacteristic mBatteryLevelCharacteristic;
+	/** Last received Battery Level value. */
+	private Integer mBatteryLevel;
 
 	/**
 	 * The manager constructor.
@@ -41,10 +43,12 @@ public abstract class BatteryManager<T extends BatteryManagerCallbacks> extends
 	protected abstract BatteryManagerGattCallback getGattCallback();
 
 	public void readBatteryLevelCharacteristic() {
+		if (isConnected()) {
 			readCharacteristic(mBatteryLevelCharacteristic)
 					.with(new BatteryLevelDataCallback() {
 						@Override
 						public void onBatteryLevelChanged(@NonNull final BluetoothDevice device, final int batteryLevel) {
+							mBatteryLevel = batteryLevel;
 							mCallbacks.onBatteryLevelChanged(device, batteryLevel);
 						}
 
@@ -55,13 +59,16 @@ public abstract class BatteryManager<T extends BatteryManagerCallbacks> extends
 					})
 					.fail(status -> log(LogContract.Log.Level.WARNING, "Battery Level characteristic not found"));
 		}
+	}
 
 	public void enableBatteryLevelCharacteristicNotifications() {
+		if (isConnected()) {
 			// If the Battery Level characteristic is null, the request will be ignored
 			enableNotifications(mBatteryLevelCharacteristic)
 					.with(new BatteryLevelDataCallback() {
 						@Override
 						public void onBatteryLevelChanged(@NonNull final BluetoothDevice device, final int batteryLevel) {
+							mBatteryLevel = batteryLevel;
 							mCallbacks.onBatteryLevelChanged(device, batteryLevel);
 						}
 
@@ -73,11 +80,26 @@ public abstract class BatteryManager<T extends BatteryManagerCallbacks> extends
 					.done(() -> log(LogContract.Log.Level.INFO, "Battery Level notifications enabled"))
 					.fail(status -> log(LogContract.Log.Level.WARNING, "Battery Level characteristic not found"));
 		}
+	}
 
+	/**
+	 *
+	 */
 	public void disableBatteryLevelCharacteristicNotifications() {
+		if (isConnected()) {
 			disableNotifications(mBatteryLevelCharacteristic)
 					.done(() -> log(LogContract.Log.Level.INFO, "Battery Level notifications disabled"));
 		}
+	}
+
+	/**
+	 * Returns the last received Battery Level value.
+	 * The value is set to null when the device disconnects.
+	 * @return Battery Level value, in percent.
+	 */
+	public Integer getBatteryLevel() {
+		return mBatteryLevel;
+	}
 
 	protected abstract class BatteryManagerGattCallback extends BleManagerGattCallback {
 
@@ -99,6 +121,7 @@ public abstract class BatteryManager<T extends BatteryManagerCallbacks> extends
 		@Override
 		protected void onDeviceDisconnected() {
 			mBatteryLevelCharacteristic = null;
+			mBatteryLevel = null;
 		}
 	}
 }

app/src/main/java/no/nordicsemi/android/nrftoolbox/cgms/CGMSActivity.java

@@ -35,17 +35,20 @@ import android.view.MenuItem;
 import android.view.View;
 import android.widget.ListView;
 import android.widget.PopupMenu;
+import android.widget.TextView;
 
 import java.util.UUID;
 
 import no.nordicsemi.android.nrftoolbox.R;
 import no.nordicsemi.android.nrftoolbox.profile.BleProfileService;
 import no.nordicsemi.android.nrftoolbox.profile.BleProfileServiceReadyActivity;
+import no.nordicsemi.android.nrftoolbox.proximity.ProximityService;
 
 public class CGMSActivity extends BleProfileServiceReadyActivity<CGMService.CGMSBinder> implements PopupMenu.OnMenuItemClickListener {
 	private View mControlPanelStd;
 	private View mControlPanelAbort;
 	private ListView mRecordsListView;
+	private TextView mBatteryLevelView;
 	private CGMSRecordsAdapter mCgmsRecordsAdapter;
 
 	private CGMService.CGMSBinder mBinder;
@@ -65,6 +68,7 @@ public class CGMSActivity extends BleProfileServiceReadyActivity<CGMService.CGMS
 		mRecordsListView = findViewById(R.id.list);
 		mControlPanelStd = findViewById(R.id.cgms_control_std);
 		mControlPanelAbort = findViewById(R.id.cgms_control_abort);
+		mBatteryLevelView = findViewById(R.id.battery);
 
 		findViewById(R.id.action_last).setOnClickListener(v -> {
 			clearRecords();
@@ -166,10 +170,15 @@ public class CGMSActivity extends BleProfileServiceReadyActivity<CGMService.CGMS
 		});
 	}
 
+	public void onBatteryLevelChanged(final BluetoothDevice device, final int value) {
+		mBatteryLevelView.setText(getString(R.string.battery, value));
+	}
+
 	@Override
 	public void onDeviceDisconnected(final BluetoothDevice device) {
 		super.onDeviceDisconnected(device);
 		setOperationInProgress(false);
+		mBatteryLevelView.setText(R.string.not_available);
 	}
 
 	@Override
@@ -181,6 +190,7 @@ public class CGMSActivity extends BleProfileServiceReadyActivity<CGMService.CGMS
 	@Override
 	protected void setDefaultUI() {
 		clearRecords();
+		mBatteryLevelView.setText(R.string.not_available);
 	}
 
 	@Override
@@ -217,6 +227,7 @@ public class CGMSActivity extends BleProfileServiceReadyActivity<CGMService.CGMS
 		@Override
 		public void onReceive(final Context context, final Intent intent) {
 			final String action = intent.getAction();
+			final BluetoothDevice device = intent.getParcelableExtra(ProximityService.EXTRA_DEVICE);
 
 			switch (action) {
 				case CGMService.BROADCAST_NEW_CGMS_VALUE: {
@@ -237,6 +248,11 @@ public class CGMSActivity extends BleProfileServiceReadyActivity<CGMService.CGMS
 					// Update GUI
 					setOperationInProgress(true);
 					break;
+				case CGMService.BROADCAST_BATTERY_LEVEL:
+					final int batteryLevel = intent.getIntExtra(CGMService.EXTRA_BATTERY_LEVEL, 0);
+					// Update GUI
+					onBatteryLevelChanged(device, batteryLevel);
+					break;
 				case CGMService.OPERATION_FAILED:
 					// Update GUI
 					showToast(R.string.gls_operation_failed);
@@ -258,6 +274,7 @@ public class CGMSActivity extends BleProfileServiceReadyActivity<CGMService.CGMS
 		intentFilter.addAction(CGMService.OPERATION_NOT_SUPPORTED);
 		intentFilter.addAction(CGMService.OPERATION_ABORTED);
 		intentFilter.addAction(CGMService.OPERATION_FAILED);
+		intentFilter.addAction(CGMService.BROADCAST_BATTERY_LEVEL);
 		return intentFilter;
 	}
 }

app/src/main/java/no/nordicsemi/android/nrftoolbox/cgms/CGMService.java

@@ -22,6 +22,10 @@ import no.nordicsemi.android.nrftoolbox.profile.BleProfileService;
 
 public class CGMService extends BleProfileService implements CGMSManagerCallbacks {
     private static final String ACTION_DISCONNECT = "no.nordicsemi.android.nrftoolbox.cgms.ACTION_DISCONNECT";
+
+    public static final String BROADCAST_BATTERY_LEVEL = "no.nordicsemi.android.nrftoolbox.BROADCAST_BATTERY_LEVEL";
+    public static final String EXTRA_BATTERY_LEVEL = "no.nordicsemi.android.nrftoolbox.EXTRA_BATTERY_LEVEL";
+
     public static final String BROADCAST_NEW_CGMS_VALUE = "no.nordicsemi.android.nrftoolbox.cgms.BROADCAST_NEW_CGMS_VALUE";
     public static final String BROADCAST_DATA_SET_CLEAR = "no.nordicsemi.android.nrftoolbox.cgms.BROADCAST_DATA_SET_CLEAR";
     public static final String OPERATION_STARTED = "no.nordicsemi.android.nrftoolbox.cgms.OPERATION_STARTED";
@@ -33,9 +37,6 @@ public class CGMService extends BleProfileService implements CGMSManagerCallback
     public static final String EXTRA_CGMS_RECORD = "no.nordicsemi.android.nrftoolbox.cgms.EXTRA_CGMS_RECORD";
     public static final String EXTRA_DATA = "no.nordicsemi.android.nrftoolbox.cgms.EXTRA_DATA";
 
-    public static final String BROADCAST_BATTERY_LEVEL = "no.nordicsemi.android.nrftoolbox.BROADCAST_BATTERY_LEVEL";
-	public static final String EXTRA_BATTERY_LEVEL = "no.nordicsemi.android.nrftoolbox.EXTRA_BATTERY_LEVEL";
-
     private final static int NOTIFICATION_ID = 229;
     private final static int OPEN_ACTIVITY_REQ = 0;
     private final static int DISCONNECT_REQ = 1;
@@ -277,10 +278,10 @@ public class CGMService extends BleProfileService implements CGMSManagerCallback
     }
 
     @Override
-    public void onBatteryLevelChanged(@NonNull final BluetoothDevice device, final int value) {
+    public void onBatteryLevelChanged(@NonNull final BluetoothDevice device, final int batteryLevel) {
         final Intent broadcast = new Intent(BROADCAST_BATTERY_LEVEL);
-        broadcast.putExtra(EXTRA_DEVICE, getBluetoothDevice());
+        broadcast.putExtra(EXTRA_DEVICE, device);
-        broadcast.putExtra(EXTRA_BATTERY_LEVEL, value);
+        broadcast.putExtra(EXTRA_BATTERY_LEVEL, batteryLevel);
         LocalBroadcastManager.getInstance(this).sendBroadcast(broadcast);
     }
 }

app/src/main/java/no/nordicsemi/android/nrftoolbox/csc/CSCActivity.java

@@ -187,7 +187,7 @@ public class CSCActivity extends BleProfileServiceReadyActivity<CSCService.CSCBi
 		mBatteryLevelView.setText(R.string.not_available);
 	}
 
-	private void onMeasurementReceived(float speed, float distance, float totalDistance) {
+	private void onMeasurementReceived(final BluetoothDevice device, float speed, float distance, float totalDistance) {
 		final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
 		final int unit = Integer.parseInt(preferences.getString(SettingsFragment.SETTINGS_UNIT, String.valueOf(SettingsFragment.SETTINGS_UNIT_DEFAULT)));
 
@@ -223,12 +223,12 @@ public class CSCActivity extends BleProfileServiceReadyActivity<CSCService.CSCBi
 		mSpeedView.setText(String.format(Locale.US, "%.1f", speed));
 	}
 
-	private void onGearRatioUpdate(final float ratio, final int cadence) {
+	private void onGearRatioUpdate(final BluetoothDevice device, final int cadence, final float ratio) {
-		mGearRatioView.setText(String.format(Locale.US, "%.1f", ratio));
 		mCadenceView.setText(String.format(Locale.US, "%d", cadence));
+		mGearRatioView.setText(String.format(Locale.US, "%.1f", ratio));
 	}
 
-	public void onBatteryLevelChanged(final int value) {
+	public void onBatteryLevelChanged(final BluetoothDevice device, final int value) {
 		mBatteryLevelView.setText(getString(R.string.battery, value));
 	}
 
@@ -236,22 +236,23 @@ public class CSCActivity extends BleProfileServiceReadyActivity<CSCService.CSCBi
 		@Override
 		public void onReceive(final Context context, final Intent intent) {
 			final String action = intent.getAction();
+			final BluetoothDevice device = intent.getParcelableExtra(CSCService.EXTRA_DEVICE);
 
 			if (CSCService.BROADCAST_WHEEL_DATA.equals(action)) {
 				final float speed = intent.getFloatExtra(CSCService.EXTRA_SPEED, 0.0f); // [m/s]
 				final float distance = intent.getFloatExtra(CSCService.EXTRA_DISTANCE, 0);
 				final float totalDistance = intent.getFloatExtra(CSCService.EXTRA_TOTAL_DISTANCE, 0);
 				// Update GUI
-				onMeasurementReceived(speed, distance, totalDistance);
+				onMeasurementReceived(device, speed, distance, totalDistance);
 			} else if (CSCService.BROADCAST_CRANK_DATA.equals(action)) {
 				final float ratio = intent.getFloatExtra(CSCService.EXTRA_GEAR_RATIO, 0);
 				final int cadence = intent.getIntExtra(CSCService.EXTRA_CADENCE, 0);
 				// Update GUI
-				onGearRatioUpdate(ratio, cadence);
+				onGearRatioUpdate(device, cadence, ratio);
 			} else if (CSCService.BROADCAST_BATTERY_LEVEL.equals(action)) {
 				final int batteryLevel = intent.getIntExtra(CSCService.EXTRA_BATTERY_LEVEL, 0);
 				// Update GUI
-				onBatteryLevelChanged(batteryLevel);
+				onBatteryLevelChanged(device, batteryLevel);
 			}
 		}
 	};

app/src/main/java/no/nordicsemi/android/nrftoolbox/profile/multiconnect/BleMulticonnectProfileService.java

@@ -261,12 +261,6 @@ public abstract class BleMulticonnectProfileService extends Service implements B
 
 		if (!mActivityIsChangingConfiguration) {
 			onRebind();
-			// This method will read the Battery Level value from each connected device, if possible and then try to enable battery notifications (if it has NOTIFY property).
-			// If the Battery Level characteristic has only the NOTIFY property, it will only try to enable notifications.
-			for (final BleManager<BleManagerCallbacks> manager : mBleManagers.values()) {
-				if (manager.isConnected())
-					manager.readBatteryLevel();
-			}
 		}
 	}
 
@@ -286,12 +280,6 @@ public abstract class BleMulticonnectProfileService extends Service implements B
 		if (!mActivityIsChangingConfiguration) {
 			if (!mManagedDevices.isEmpty()) {
 				onUnbind();
-				// When we are connected, but the application is not open, we are not really interested in battery level notifications.
-				// But we will still be receiving other values, if enabled.
-				for (final BleManager<BleManagerCallbacks> manager : mBleManagers.values()) {
-					if (manager.isConnected())
-						manager.disableBatteryLevelNotifications();
-				}
 			} else {
 				// The last activity has disconnected from the service and there are no devices to manage. The service may be stopped.
 				stopSelf();

app/src/main/java/no/nordicsemi/android/nrftoolbox/proximity/DeviceAdapter.java

@@ -136,8 +136,8 @@ public class DeviceAdapter extends RecyclerView.Adapter<DeviceAdapter.ViewHolder
 			actionButton.setImageResource(on ? R.drawable.ic_stat_notify_proximity_silent : R.drawable.ic_stat_notify_proximity_find);
 			actionButton.setVisibility(state == BluetoothGatt.STATE_CONNECTED ? View.VISIBLE : View.GONE);
 
-			final int batteryValue = mService.getBatteryLevel(device);
+			final Integer batteryValue = mService.getBatteryLevel(device);
-			if (batteryValue >= 0) {
+			if (batteryValue != null) {
 				batteryView.getCompoundDrawables()[0 /*left*/].setLevel(batteryValue);
 				batteryView.setVisibility(View.VISIBLE);
 				batteryView.setText(batteryView.getResources().getString(R.string.battery, batteryValue));

app/src/main/java/no/nordicsemi/android/nrftoolbox/proximity/ProximityActivity.java

@@ -23,7 +23,12 @@ package no.nordicsemi.android.nrftoolbox.proximity;
 
 import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothDevice;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
 import android.os.Bundle;
+import android.support.v4.content.LocalBroadcastManager;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
 
@@ -50,6 +55,17 @@ public class ProximityActivity extends BleMulticonnectProfileServiceReadyActivit
 		setGUI();
 	}
 
+	@Override
+	protected void onInitialize(final Bundle savedInstanceState) {
+		LocalBroadcastManager.getInstance(this).registerReceiver(mBroadcastReceiver, makeIntentFilter());
+	}
+
+	@Override
+	protected void onDestroy() {
+		super.onDestroy();
+		LocalBroadcastManager.getInstance(this).unregisterReceiver(mBroadcastReceiver);
+	}
+
 	private void setGUI() {
 		final RecyclerView recyclerView = mDevicesView = findViewById(android.R.id.list);
 		recyclerView.setLayoutManager(new LinearLayoutManager(this));
@@ -133,12 +149,12 @@ public class ProximityActivity extends BleMulticonnectProfileServiceReadyActivit
 			showLinklossDialog(device.getName());
 	}
 
-	@Override
+	private void onBatteryLevelChanged(final BluetoothDevice device, final int batteryLevel) {
-	public void onBatteryValueReceived(final BluetoothDevice device, final int value) {
 		if (mAdapter != null)
 			mAdapter.onBatteryValueReceived(device); // Value will be obtained from the service
 	}
 
+
 	private void showLinklossDialog(final String name) {
 		try {
 			final LinklossFragment dialog = LinklossFragment.getInstance(name);
@@ -147,4 +163,23 @@ public class ProximityActivity extends BleMulticonnectProfileServiceReadyActivit
 			// the activity must have been destroyed
 		}
 	}
+	private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
+		@Override
+		public void onReceive(final Context context, final Intent intent) {
+			final String action = intent.getAction();
+			final BluetoothDevice device = intent.getParcelableExtra(ProximityService.EXTRA_DEVICE);
+
+			if (ProximityService.BROADCAST_BATTERY_LEVEL.equals(action)) {
+				final int batteryLevel = intent.getIntExtra(ProximityService.EXTRA_BATTERY_LEVEL, 0);
+				// Update GUI
+				onBatteryLevelChanged(device, batteryLevel);
+			}
+		}
+	};
+
+	private static IntentFilter makeIntentFilter() {
+		final IntentFilter intentFilter = new IntentFilter();
+		intentFilter.addAction(ProximityService.BROADCAST_BATTERY_LEVEL);
+		return intentFilter;
+	}
 }

app/src/main/java/no/nordicsemi/android/nrftoolbox/proximity/ProximityManager.java

@@ -28,24 +28,19 @@ import android.bluetooth.BluetoothGattService;
 import android.content.Context;
 import android.support.annotation.NonNull;
 
-import java.util.Deque;
-import java.util.LinkedList;
 import java.util.UUID;
 
-import no.nordicsemi.android.ble.BleManager;
-import no.nordicsemi.android.ble.Request;
 import no.nordicsemi.android.log.LogContract;
-import no.nordicsemi.android.log.Logger;
+import no.nordicsemi.android.nrftoolbox.battery.BatteryManager;
 import no.nordicsemi.android.nrftoolbox.parser.AlertLevelParser;
-import no.nordicsemi.android.nrftoolbox.utility.DebugLogger;
 
-public class ProximityManager extends BleManager<ProximityManagerCallbacks> {
+class ProximityManager extends BatteryManager<ProximityManagerCallbacks> {
 	private final String TAG = "ProximityManager";
 
 	/** Immediate Alert service UUID */
-	public final static UUID IMMEDIATE_ALERT_SERVICE_UUID = UUID.fromString("00001802-0000-1000-8000-00805f9b34fb");
+	private final static UUID IMMEDIATE_ALERT_SERVICE_UUID = UUID.fromString("00001802-0000-1000-8000-00805f9b34fb");
 	/** Linkloss service UUID */
-	public final static UUID LINKLOSS_SERVICE_UUID = UUID.fromString("00001803-0000-1000-8000-00805f9b34fb");
+	final static UUID LINKLOSS_SERVICE_UUID = UUID.fromString("00001803-0000-1000-8000-00805f9b34fb");
 	/** Alert Level characteristic UUID */
 	private static final UUID ALERT_LEVEL_CHARACTERISTIC_UUID = UUID.fromString("00002A06-0000-1000-8000-00805f9b34fb");
 
@@ -55,9 +50,8 @@ public class ProximityManager extends BleManager<ProximityManagerCallbacks> {
 
 	private BluetoothGattCharacteristic mAlertLevelCharacteristic, mLinklossCharacteristic;
 	private boolean mAlertOn;
-	private int mBatteryLevel;
 
-	public ProximityManager(final Context context) {
+	ProximityManager(final Context context) {
 		super(context);
 	}
 
@@ -67,17 +61,18 @@ public class ProximityManager extends BleManager<ProximityManagerCallbacks> {
 	}
 
 	@Override
-	protected BleManagerGattCallback getGattCallback() {
+	protected BatteryManagerGattCallback getGattCallback() {
 		return mGattCallback;
 	}
 
 	/**
 	 * BluetoothGatt callbacks for connection/disconnection, service discovery, receiving indication, etc
 	 */
-	private final BleManagerGattCallback mGattCallback = new BleManagerGattCallback() {
+	private final BatteryManagerGattCallback mGattCallback = new BatteryManagerGattCallback() {
 
 		@Override
 		protected void initialize(@NonNull final BluetoothDevice device) {
+			super.initialize(device);
 			writeCharacteristic(mLinklossCharacteristic, HIGH_ALERT);
 		}
 
@@ -92,6 +87,7 @@ public class ProximityManager extends BleManager<ProximityManagerCallbacks> {
 
 		@Override
 		protected boolean isOptionalServiceSupported(@NonNull final BluetoothGatt gatt) {
+			super.isOptionalServiceSupported(gatt);
 			final BluetoothGattService iaService = gatt.getService(IMMEDIATE_ALERT_SERVICE_UUID);
 			if (iaService != null) {
 				mAlertLevelCharacteristic = iaService.getCharacteristic(ALERT_LEVEL_CHARACTERISTIC_UUID);
@@ -101,6 +97,7 @@ public class ProximityManager extends BleManager<ProximityManagerCallbacks> {
 
 		@Override
 		protected void onDeviceDisconnected() {
+			super.onDeviceDisconnected();
 			mAlertLevelCharacteristic = null;
 			mLinklossCharacteristic = null;
 			// Reset the alert flag
@@ -140,12 +137,4 @@ public class ProximityManager extends BleManager<ProximityManagerCallbacks> {
 	boolean isAlertEnabled() {
 		return mAlertOn;
 	}
-
-	/**
-	 * Returns the last obtained Battery Level value in percent.
-	 * @return battery level value
-	 */
-	int getBatteryLevel() {
-		return mBatteryLevel;
-	}
 }

app/src/main/java/no/nordicsemi/android/nrftoolbox/proximity/ProximityManagerCallbacks.java

@@ -21,8 +21,8 @@
  */
 package no.nordicsemi.android.nrftoolbox.proximity;
 
-import no.nordicsemi.android.ble.BleManagerCallbacks;
+import no.nordicsemi.android.nrftoolbox.battery.BatteryManagerCallbacks;
 
-public interface ProximityManagerCallbacks extends BleManagerCallbacks {
+interface ProximityManagerCallbacks extends BatteryManagerCallbacks {
 	// No additional methods
 }

app/src/main/java/no/nordicsemi/android/nrftoolbox/proximity/ProximityServerManager.java

@@ -42,13 +42,13 @@ import no.nordicsemi.android.nrftoolbox.parser.AlertLevelParser;
 import no.nordicsemi.android.nrftoolbox.profile.multiconnect.IDeviceLogger;
 import no.nordicsemi.android.nrftoolbox.utility.ParserUtils;
 
-public class ProximityServerManager  {
+class ProximityServerManager  {
 	private final String TAG = "ProximityServerManager";
 
 	/** Immediate Alert service UUID */
-	public final static UUID IMMEDIATE_ALERT_SERVICE_UUID = UUID.fromString("00001802-0000-1000-8000-00805f9b34fb");
+	final static UUID IMMEDIATE_ALERT_SERVICE_UUID = UUID.fromString("00001802-0000-1000-8000-00805f9b34fb");
 	/** Linkloss service UUID */
-	public final static UUID LINKLOSS_SERVICE_UUID = UUID.fromString("00001803-0000-1000-8000-00805f9b34fb");
+	final static UUID LINKLOSS_SERVICE_UUID = UUID.fromString("00001803-0000-1000-8000-00805f9b34fb");
 	/** Alert Level characteristic UUID */
 	private static final UUID ALERT_LEVEL_CHARACTERISTIC_UUID = UUID.fromString("00002A06-0000-1000-8000-00805f9b34fb");
 
@@ -70,7 +70,7 @@ public class ProximityServerManager  {
 		void onGattServerFailed(final int error);
 	}
 
-	public ProximityServerManager(final ProximityServerManagerCallbacks callbacks) {
+	ProximityServerManager(final ProximityServerManagerCallbacks callbacks) {
 		mHandler = new Handler();
 		mCallbacks = callbacks;
 	}

app/src/main/java/no/nordicsemi/android/nrftoolbox/proximity/ProximityServerManagerCallbacks.java

@@ -23,9 +23,7 @@ package no.nordicsemi.android.nrftoolbox.proximity;
 
 import android.bluetooth.BluetoothDevice;
 
-import no.nordicsemi.android.ble.BleManagerCallbacks;
+public interface ProximityServerManagerCallbacks {
-
-public interface ProximityServerManagerCallbacks extends BleManagerCallbacks {
 	void onAlarmTriggered(final BluetoothDevice device);
 
 	void onAlarmStopped(final BluetoothDevice device);

app/src/main/java/no/nordicsemi/android/nrftoolbox/proximity/ProximityService.java

@@ -34,9 +34,11 @@ import android.media.AudioManager;
 import android.media.MediaPlayer;
 import android.media.RingtoneManager;
 import android.net.Uri;
+import android.support.annotation.NonNull;
 import android.support.v4.app.NotificationCompat;
 import android.support.v4.app.NotificationManagerCompat;
 import android.support.v4.content.ContextCompat;
+import android.support.v4.content.LocalBroadcastManager;
 import android.text.TextUtils;
 import android.util.Log;
 
@@ -45,7 +47,6 @@ import java.util.LinkedList;
 import java.util.List;
 
 import no.nordicsemi.android.ble.BleManager;
-import no.nordicsemi.android.ble.BleManagerCallbacks;
 import no.nordicsemi.android.log.LogContract;
 import no.nordicsemi.android.nrftoolbox.FeaturesActivity;
 import no.nordicsemi.android.nrftoolbox.R;
@@ -56,10 +57,12 @@ public class ProximityService extends BleMulticonnectProfileService implements P
 	@SuppressWarnings("unused")
 	private static final String TAG = "ProximityService";
 
+	public static final String BROADCAST_BATTERY_LEVEL = "no.nordicsemi.android.nrftoolbox.BROADCAST_BATTERY_LEVEL";
+	public static final String EXTRA_BATTERY_LEVEL = "no.nordicsemi.android.nrftoolbox.EXTRA_BATTERY_LEVEL";
+
 	private final static String ACTION_DISCONNECT = "no.nordicsemi.android.nrftoolbox.proximity.ACTION_DISCONNECT";
 	private final static String ACTION_FIND = "no.nordicsemi.android.nrftoolbox.proximity.ACTION_FIND";
 	private final static String ACTION_SILENT = "no.nordicsemi.android.nrftoolbox.proximity.ACTION_SILENT";
-	private final static String EXTRA_DEVICE = "no.nordicsemi.android.nrftoolbox.proximity.EXTRA_DEVICE";
 
 	private final static String PROXIMITY_GROUP_ID = "proximity_connected_tags";
 	private final static int NOTIFICATION_ID = 1000;
@@ -109,9 +112,10 @@ public class ProximityService extends BleMulticonnectProfileService implements P
 		/**
 		 * Returns the last received battery level value.
 		 * @param device the device of which battery level should be returned
-		 * @return battery value or -1 if no value was received or Battery Level characteristic was not found
+		 * @return battery value or null if no value was received or Battery Level characteristic was not found,
+		 * or the device is disconnected
 		 */
-		public int getBatteryLevel(final BluetoothDevice device) {
+		public Integer getBatteryLevel(final BluetoothDevice device) {
 			final ProximityManager manager = (ProximityManager) getBleManager(device);
 			return manager.getBatteryLevel();
 		}
@@ -232,10 +236,24 @@ public class ProximityService extends BleMulticonnectProfileService implements P
 	protected void onRebind() {
 		// When the activity rebinds to the service, remove the notification
 		cancelNotifications();
+
+		// This method will read the Battery Level value from each connected device, if possible and then try to enable battery notifications (if it has NOTIFY property).
+		// If the Battery Level characteristic has only the NOTIFY property, it will only try to enable notifications.
+		for (final BluetoothDevice device : getManagedDevices()) {
+			final ProximityManager manager = (ProximityManager) getBleManager(device);
+			manager.readBatteryLevelCharacteristic();
+			manager.enableBatteryLevelCharacteristicNotifications();
+		}
 	}
 
 	@Override
 	public void onUnbind() {
+		// When we are connected, but the application is not open, we are not really interested in battery level notifications.
+		// But we will still be receiving other values, if enabled.
+		for (final BluetoothDevice device : getManagedDevices()) {
+			final ProximityManager manager = (ProximityManager) getBleManager(device);
+			manager.disableBatteryLevelCharacteristicNotifications();
+		}
 
 		createBackgroundNotification();
 	}
@@ -292,6 +310,14 @@ public class ProximityService extends BleMulticonnectProfileService implements P
 		stopAlarm(device);
 	}
 
+	@Override
+	public void onBatteryLevelChanged(@NonNull final BluetoothDevice device, final int batteryLevel) {
+		final Intent broadcast = new Intent(BROADCAST_BATTERY_LEVEL);
+		broadcast.putExtra(EXTRA_DEVICE, device);
+		broadcast.putExtra(EXTRA_BATTERY_LEVEL, batteryLevel);
+		LocalBroadcastManager.getInstance(this).sendBroadcast(broadcast);
+	}
+
 	private void createBackgroundNotification() {
 		final List<BluetoothDevice> connectedDevices = getConnectedDevices();
 		for (final BluetoothDevice device : connectedDevices) {