Update version number

app/build.gradle

@@ -9,8 +9,8 @@ android {
         buildConfigField "boolean", "HIDDEN_APP", "false"
         minSdkVersion 14
         targetSdkVersion 26
-        versionCode 41
-        versionName '5.4'
+        versionCode 42
+        versionName '5.5'
     }
 
     lintOptions {

app/src/hidden/AndroidManifest.xml

@@ -8,6 +8,16 @@
         android:label="@string/hidden_app_name"
         tools:replace="android:label">
 
+        <activity
+            android:name=".MainActivity">
+            <intent-filter android:label="@string/app_name">
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+                <data android:scheme="https" android:host="www.traccar.org" android:pathPrefix="/hidden" />
+            </intent-filter>
+        </activity>
+
         <receiver android:name="org.traccar.client.DialLaunchReceiver" >
             <intent-filter>
                 <action android:name="android.intent.action.NEW_OUTGOING_CALL" />

app/src/main/java/org/traccar/client/PositionProvider.java

@@ -89,9 +89,12 @@ public abstract class PositionProvider {
 
     public static double getBatteryLevel(Context context) {
         Intent batteryIntent = context.registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
+        if (batteryIntent != null) {
             int level = batteryIntent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
             int scale = batteryIntent.getIntExtra(BatteryManager.EXTRA_SCALE, 1);
             return (level * 100.0) / scale;
         }
+        return 0;
+    }
 
 }