Fix Android 11 location permissions

app/src/main/AndroidManifest.xml

@@ -6,6 +6,7 @@
 
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+    <uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

app/src/main/java/org/traccar/client/BatteryOptimizationHelper.kt

@@ -66,7 +66,7 @@ class BatteryOptimizationHelper {
         }
     }
 
-    fun requestException(context: Context) {
+    fun requestException(context: Context): Boolean {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
             val sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context)
             if (!sharedPreferences.getBoolean(KEY_EXCEPTION_REQUESTED, false)) {
@@ -80,15 +80,19 @@ class BatteryOptimizationHelper {
                             requestVendorException(context)
                         }
                     }
+                    return true
                 }
             } else if (!sharedPreferences.getBoolean(KEY_AUTOSTART_REQUESTED, false)) {
                 sharedPreferences.edit().putBoolean(KEY_AUTOSTART_REQUESTED, true).apply()
                 try {
-                    AutoStartPermissionHelper.getInstance().getAutoStartPermission(context)
+                    if (AutoStartPermissionHelper.getInstance().getAutoStartPermission(context)) {
+                        return true
+                    }
                 } catch (e: SecurityException) {
                 }
             }
         }
+        return false
     }
 
     companion object {

app/src/main/java/org/traccar/client/MainFragment.kt

@@ -54,6 +54,7 @@ class MainFragment : PreferenceFragmentCompat(), OnSharedPreferenceChangeListene
     private lateinit var sharedPreferences: SharedPreferences
     private lateinit var alarmManager: AlarmManager
     private lateinit var alarmIntent: PendingIntent
+    private var requestingPermissions: Boolean = false
 
     @SuppressLint("UnspecifiedImmutableFlag")
     override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
@@ -154,6 +155,13 @@ class MainFragment : PreferenceFragmentCompat(), OnSharedPreferenceChangeListene
         }
     }
 
+    override fun onStart() {
+        super.onStart()
+        if (requestingPermissions) {
+            requestingPermissions = BatteryOptimizationHelper().requestException(requireContext())
+        }
+    }
+
     override fun onResume() {
         super.onResume()
         sharedPreferences.registerOnSharedPreferenceChangeListener(this)
@@ -214,6 +222,19 @@ class MainFragment : PreferenceFragmentCompat(), OnSharedPreferenceChangeListene
         findPreference<Preference>(KEY_DEVICE)?.summary = sharedPreferences.getString(KEY_DEVICE, null)
     }
 
+    private fun showBackgroundLocationDialog(context: Context, onSuccess: () -> Unit) {
+        val builder = AlertDialog.Builder(context)
+        val option = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+            context.packageManager.backgroundPermissionOptionLabel
+        } else {
+            context.getString(R.string.request_background_option)
+        }
+        builder.setMessage(context.getString(R.string.request_background, option))
+        builder.setPositiveButton(android.R.string.ok) { _, _ -> onSuccess() }
+        builder.setNegativeButton(android.R.string.cancel, null)
+        builder.show()
+    }
+
     private fun startTrackingService(checkPermission: Boolean, initialPermission: Boolean) {
         var permission = initialPermission
         if (checkPermission) {
@@ -224,10 +245,7 @@ class MainFragment : PreferenceFragmentCompat(), OnSharedPreferenceChangeListene
             permission = requiredPermissions.isEmpty()
             if (!permission) {
                 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
-                    requestPermissions(
+                    requestPermissions(requiredPermissions.toTypedArray(), PERMISSIONS_REQUEST_LOCATION)
-                        requiredPermissions.toTypedArray(),
-                        PERMISSIONS_REQUEST_LOCATION
-                    )
                 }
                 return
             }
@@ -239,7 +257,16 @@ class MainFragment : PreferenceFragmentCompat(), OnSharedPreferenceChangeListene
                 AlarmManager.ELAPSED_REALTIME_WAKEUP,
                 ALARM_MANAGER_INTERVAL.toLong(), ALARM_MANAGER_INTERVAL.toLong(), alarmIntent
             )
-            BatteryOptimizationHelper().requestException(requireContext())
+
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q
+                && ContextCompat.checkSelfPermission(requireContext(), Manifest.permission.ACCESS_BACKGROUND_LOCATION) != PackageManager.PERMISSION_GRANTED) {
+                requestingPermissions = true
+                showBackgroundLocationDialog(requireContext()) {
+                    requestPermissions(arrayOf(Manifest.permission.ACCESS_BACKGROUND_LOCATION), PERMISSIONS_REQUEST_BACKGROUND_LOCATION)
+                }
+            } else {
+                requestingPermissions = BatteryOptimizationHelper().requestException(requireContext())
+            }
         } else {
             sharedPreferences.edit().putBoolean(KEY_STATUS, false).apply()
             val preference = findPreference<TwoStatePreference>(KEY_STATUS)
@@ -292,6 +319,7 @@ class MainFragment : PreferenceFragmentCompat(), OnSharedPreferenceChangeListene
         const val KEY_BUFFER = "buffer"
         const val KEY_WAKELOCK = "wakelock"
         private const val PERMISSIONS_REQUEST_LOCATION = 2
+        private const val PERMISSIONS_REQUEST_BACKGROUND_LOCATION = 3
     }
 
 }

app/src/main/res/values/strings.xml

@@ -48,4 +48,6 @@
   <string name="hidden_alert">The app has been hidden. To open it again please dial 8722227 (TRACCAR).</string>
   <string name="error_msg_invalid_url">Please enter a valid http:// or https:// URL</string>
   <string name="request_exception">To continuously collect location data please turn off battery optimization for the app.</string>
+  <string name="request_background">To continuously collect location data please enable \"%s\" permission.</string>
+  <string name="request_background_option">Allow all the time</string>
 </resources>