Make Android Joystick init behave in the same was as for SDL

src/Joystick/JoystickAndroid.cc

@@ -76,8 +76,6 @@ QMap<QString, Joystick*> JoystickAndroid::discover(MultiVehicleManager* _multiVe
     bool joystickFound = false;
     static QMap<QString, Joystick*> ret;
 
-    _initStatic(); //it's enough to run it once, should be in a static constructor
-
     QMutexLocker lock(&m_mutex);
 
     QAndroidJniEnvironment env;
@@ -194,7 +192,7 @@ uint8_t JoystickAndroid::_getHat(int hat,int i) {
 }
 
 //helper method
-void JoystickAndroid::_initStatic() {
+bool JoystickAndroid::init() {
     //this gets list of all possible buttons - this is needed to check how many buttons our gamepad supports
     //instead of the whole logic below we could have just a simple array of hardcoded int values as these 'should' not change
 
@@ -229,5 +227,7 @@ void JoystickAndroid::_initStatic() {
 
     ACTION_DOWN = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "ACTION_DOWN");
     ACTION_UP = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "ACTION_UP");
+
+    return true;
 }
 

src/Joystick/JoystickAndroid.h

@@ -16,9 +16,12 @@ class JoystickAndroid : public Joystick, public QtAndroidPrivate::GenericMotionE
 {
 public:
     JoystickAndroid(const QString& name, int axisCount, int buttonCount, int id, MultiVehicleManager* multiVehicleManager);
+
     ~JoystickAndroid();
 
-    static QMap<QString, Joystick*> discover(MultiVehicleManager* _multiVehicleManager); 
+    static bool init();
+
+    static QMap<QString, Joystick*> discover(MultiVehicleManager* _multiVehicleManager);
 
 private:
     bool handleKeyEvent(jobject event);
@@ -37,7 +40,6 @@ private:
     bool *btnValue;
     int *axisValue;
 
-    static void _initStatic();
     static int * _androidBtnList; //list of all possible android buttons
     static int _androidBtnListCount;
 

src/Joystick/JoystickManager.cc

@@ -60,8 +60,11 @@ void JoystickManager::init() {
         _joystickCheckTimer.start(250);
     }
 #elif defined(__android__)
-    _setActiveJoystickFromSettings();
-    //TODO: Investigate Android events for Joystick hot plugging & run _joystickCheckTimer if possible
+    if (JoystickAndroid::init()) {
+        _setActiveJoystickFromSettings();
+        connect(&_joystickCheckTimer, &QTimer::timeout, this, &JoystickManager::_updateAvailableJoysticks);
+        _joystickCheckTimer.start(250);
+    }
 #endif
 }