Android: make detection of game controllers more robust

Author: alemart

android/gradle_project/allegro/src/main/java/org/liballeg/android/AllegroActivity.java

@@ -542,11 +542,14 @@ String getOsVersion()
    private boolean isJoystick(int id) {
          InputDevice input = InputDevice.getDevice(id);
          int sources = input.getSources();
-         if ((sources & InputDevice.SOURCE_JOYSTICK) == InputDevice.SOURCE_JOYSTICK) {
-            return true;
-         }
-         return false;
+
+         // the device is a game controller if it has gamepad buttons, control sticks, or both
+         boolean hasAnalogSticks = ((sources & InputDevice.SOURCE_JOYSTICK) == InputDevice.SOURCE_JOYSTICK);
+         boolean hasGamepadButtons = ((sources & InputDevice.SOURCE_GAMEPAD) == InputDevice.SOURCE_GAMEPAD);
+
+         return hasGamepadButtons || hasAnalogSticks;
    }
+
    public void reconfigureJoysticks() {
       joysticks.clear();