Android: Include Joysticks/Gamepads which are available on app start.

platform/android/java/src/org/godotengine/godot/Godot.java

@@ -1059,4 +1059,7 @@ public class Godot extends Activity implements SensorEventListener, IDownloaderC
 		mProgressFraction.setText(Helpers.getDownloadProgressString(progress.mOverallProgress,
 				progress.mOverallTotal));
 	}
+	public void initInputDevices() {
+		mView.initInputDevices();
+	}
 }

platform/android/java/src/org/godotengine/godot/GodotView.java

@@ -111,6 +111,18 @@ public class GodotView extends GLSurfaceView implements InputDeviceListener {
 		init(translucent, depth, stencil);
 	}
 
+	public void initInputDevices() {
+		/* initially add input devices*/
+		int[] deviceIds = mInputManager.getInputDeviceIds();
+		for (int deviceId : deviceIds) {
+			InputDevice device = mInputManager.getInputDevice(deviceId);
+			if (DEBUG) {
+				Log.v("GodotView", String.format("init() deviceId:%d, Name:%s\n", deviceId, device.getName()));
+			}
+			onInputDeviceAdded(deviceId);
+		}
+	}
+
 	@SuppressLint("ClickableViewAccessibility")
 	@Override
 	public boolean onTouchEvent(MotionEvent event) {
@@ -217,36 +229,42 @@ public class GodotView extends GLSurfaceView implements InputDeviceListener {
 		// Check if the device has not been already added
 		if (id < 0) {
 			InputDevice device = mInputManager.getInputDevice(deviceId);
+			//device can be null if deviceId is not found
+			if (device != null) {
+				int sources = device.getSources();
+				if (((sources & InputDevice.SOURCE_GAMEPAD) == InputDevice.SOURCE_GAMEPAD) ||
+						((sources & InputDevice.SOURCE_JOYSTICK) == InputDevice.SOURCE_JOYSTICK)) {
+					id = joy_devices.size();
 
-			id = joy_devices.size();
+					joystick joy = new joystick();
+					joy.device_id = deviceId;
+					joy.name = device.getName();
+					joy.axes = new ArrayList<InputDevice.MotionRange>();
+					joy.hats = new ArrayList<InputDevice.MotionRange>();
 
-			joystick joy = new joystick();
+					List<InputDevice.MotionRange> ranges = device.getMotionRanges();
-			joy.device_id = deviceId;
+					Collections.sort(ranges, new RangeComparator());
-			joy.name = device.getName();
-			joy.axes = new ArrayList<InputDevice.MotionRange>();
-			joy.hats = new ArrayList<InputDevice.MotionRange>();
 
-			List<InputDevice.MotionRange> ranges = device.getMotionRanges();
+					for (InputDevice.MotionRange range : ranges) {
-			Collections.sort(ranges, new RangeComparator());
+						if (range.getAxis() == MotionEvent.AXIS_HAT_X || range.getAxis() == MotionEvent.AXIS_HAT_Y) {
+							joy.hats.add(range);
+						} else {
+							joy.axes.add(range);
+						}
+					}
 
-			for (InputDevice.MotionRange range : ranges) {
+					joy_devices.add(joy);
-				if (range.getAxis() == MotionEvent.AXIS_HAT_X || range.getAxis() == MotionEvent.AXIS_HAT_Y) {
+
-					joy.hats.add(range);
+					final int device_id = id;
-				} else {
+					final String name = joy.name;
-					joy.axes.add(range);
+					queueEvent(new Runnable() {
+						@Override
+						public void run() {
+							GodotLib.joyconnectionchanged(device_id, true, name);
+						}
+					});
 				}
 			}
-
-			joy_devices.add(joy);
-
-			final int device_id = id;
-			final String name = joy.name;
-			queueEvent(new Runnable() {
-				@Override
-				public void run() {
-					GodotLib.joyconnectionchanged(device_id, true, name);
-				}
-			});
 		}
 	}
 
@@ -269,6 +287,8 @@ public class GodotView extends GLSurfaceView implements InputDeviceListener {
 
 	@Override
 	public void onInputDeviceChanged(int deviceId) {
+		onInputDeviceRemoved(deviceId);
+		onInputDeviceAdded(deviceId);
 	}
 	@Override
 	public boolean onKeyUp(final int keyCode, KeyEvent event) {

platform/android/java_godot_wrapper.cpp

@@ -59,6 +59,7 @@ GodotJavaWrapper::GodotJavaWrapper(JNIEnv *p_env, jobject p_godot_instance) {
 	_get_clipboard = p_env->GetMethodID(cls, "getClipboard", "()Ljava/lang/String;");
 	_set_clipboard = p_env->GetMethodID(cls, "setClipboard", "(Ljava/lang/String;)V");
 	_request_permission = p_env->GetMethodID(cls, "requestPermission", "(Ljava/lang/String;)Z");
+	_init_input_devices = p_env->GetMethodID(cls, "initInputDevices", "()V");
 }
 
 GodotJavaWrapper::~GodotJavaWrapper() {
@@ -183,3 +184,10 @@ bool GodotJavaWrapper::request_permission(const String &p_name) {
 		return false;
 	}
 }
+
+void GodotJavaWrapper::init_input_devices() {
+	if (_init_input_devices) {
+		JNIEnv *env = ThreadAndroid::get_env();
+		env->CallVoidMethod(godot_instance, _init_input_devices);
+	}
+}

platform/android/java_godot_wrapper.h

@@ -54,6 +54,7 @@ private:
 	jmethodID _get_clipboard = 0;
 	jmethodID _set_clipboard = 0;
 	jmethodID _request_permission = 0;
+	jmethodID _init_input_devices = 0;
 
 public:
 	GodotJavaWrapper(JNIEnv *p_env, jobject p_godot_instance);
@@ -76,6 +77,7 @@ public:
 	bool has_set_clipboard();
 	void set_clipboard(const String &p_text);
 	bool request_permission(const String &p_name);
+	void init_input_devices();
 };
 
 #endif /* !JAVA_GODOT_WRAPPER_H */

platform/android/os_android.cpp

@@ -251,6 +251,10 @@ int OS_Android::get_mouse_button_state() const {
 }
 
 void OS_Android::set_window_title(const String &p_title) {
+	//This queries/updates the currently connected devices/joypads
+	//Set_window_title is called when initializing the main loop (main.cpp)
+	//therefore this place is found to be suitable (I found no better).
+	godot_java->init_input_devices();
 }
 
 void OS_Android::set_video_mode(const VideoMode &p_video_mode, int p_screen) {