- add android manifest

- add more fonts
- add proper checks for bluetooth state and permission

QBluetoothLeUart.pri

@@ -27,3 +27,7 @@ HEADERS += \
     $$PWD/qbluetoothleuartclient.h \
     $$PWD/qbluetoothleuartdevice.h \
     $$PWD/qbluetoothleuartdevicemodel.h
+
+android {
+QT += androidextras
+}

qbluetoothleuartclient.cpp

@@ -31,8 +31,26 @@ QBluetoothLeUartClient::~QBluetoothLeUartClient(){
 // ------------------------------
 
 bool QBluetoothLeUartClient::startScanningForDevices(){
-    if(this->state != Idle && this->state != ScanFinished)
+    if(this->state != Idle && this->state != AdapterTurnedOff && this->state != ScanFinished && this->state != LocationPermissionDenied)
         return false;
+#ifdef Q_OS_ANDROID
+    else if(this->state == LocationPermissionDenied) {
+        // try to get permission
+        QtAndroid::PermissionResultMap resultMap = QtAndroid::requestPermissionsSync({"android.permission.ACCESS_FINE_LOCATION", "android.permission.ACCESS_COARSE_LOCATION"}, 5000);
+        bool resultBool = true;
+        for(QtAndroid::PermissionResult result : resultMap) {
+             if(result != QtAndroid::PermissionResult::Granted) {
+                 resultBool = false;
+                 break;
+             }
+        }
+
+        if(!resultBool) {
+            emit this->scanningErrorOccured(LocationPermissionDeniedError);
+        }
+
+    }
+#endif
 
     this->availableDevicesModel->clear();
 
@@ -161,10 +179,7 @@ bool QBluetoothLeUartClient::sendData(QString data, bool asynchronous){
 
     const QLowEnergyCharacteristic  RxChar = bluetoothService->characteristic(QBluetoothUuid(QUuid(this->txUUID)));
 
-    QByteArray Data;
-    Data.append(data);
-
-    bluetoothService->writeCharacteristic(RxChar, Data, QLowEnergyService::WriteWithoutResponse);
+    bluetoothService->writeCharacteristic(RxChar, data.toUtf8(), QLowEnergyService::WriteWithoutResponse);
 
     return true;
 }
@@ -204,10 +219,33 @@ void QBluetoothLeUartClient::handleScanFinished()
 
 void QBluetoothLeUartClient::handleDeviceScanError(QBluetoothDeviceDiscoveryAgent::Error error)
 {
-    if (error == QBluetoothDeviceDiscoveryAgent::PoweredOffError)
+    qWarning() << "Scanning ERROR: " << error;
+
+    this->availableDevices.clear();
+    this->availableDevicesModel->clear();
+
+    if (error == QBluetoothDeviceDiscoveryAgent::PoweredOffError) {
+        this->setState(AdapterTurnedOff);
         emit this->scanningErrorOccured(AdapterTurnedOffError);
-    else if (error == QBluetoothDeviceDiscoveryAgent::InputOutputError)
+    }
+    else if (error == QBluetoothDeviceDiscoveryAgent::InputOutputError) {
+        this->setState(AdapterTurnedOff);
         emit this->scanningErrorOccured(InputOutputError);
+    }
+#ifdef Q_OS_ANDROID
+    else if (error == QBluetoothDeviceDiscoveryAgent::UnknownError) {
+        // check for permission error
+        QtAndroid::PermissionResult fineLocationAccess = QtAndroid::checkPermission("android.permission.ACCESS_FINE_LOCATION");
+        QtAndroid::PermissionResult coarseLocationAccess = QtAndroid::checkPermission("android.permission.ACCESS_COARSE_LOCATION");
+
+        if(fineLocationAccess != QtAndroid::PermissionResult::Granted || coarseLocationAccess != QtAndroid::PermissionResult::Granted) {
+            this->setState(LocationPermissionDenied);
+            emit this->scanningErrorOccured(LocationPermissionDeniedError);
+        }
+        else
+            emit this->scanningErrorOccured(UnknownError);
+    }
+#endif
     else
         emit this->scanningErrorOccured(UnknownError);
 

qbluetoothleuartclient.h

@@ -6,6 +6,10 @@
 #include <QLowEnergyController>
 #include <QLowEnergyService>
 
+#ifdef Q_OS_ANDROID
+#include <QtAndroidExtras>
+#endif
+
 #ifdef QBluetoothLeUart_QML
 #include <QQmlApplicationEngine>
 #endif
@@ -127,6 +131,8 @@ public:
      */
     enum BluetoothLeUartClientState {
         Idle = 0,               /*!< Waiting for instrucions */
+        AdapterTurnedOff,       /*!< The bluetooth adapter is turned off */
+        LocationPermissionDenied, /*!< The location permssion was denied and we are therfor unable to scan! */
         Scanning,               /*!< Scanning for devices */
         ScanFinished,           /*!< Scanning has finished, we are ready to connect */
         Connecting,             /*!< Trying to connect */
@@ -139,7 +145,8 @@ public:
     enum BluetoothScanError {
         UnknownError,
         AdapterTurnedOffError,
-        InputOutputError
+        InputOutputError,
+        LocationPermissionDeniedError
     };
     Q_ENUM(BluetoothScanError);