Added controller mapping for Android TV remotes

Also fixed the back button on the remote exiting the application

android-project/app/src/main/java/org/libsdl/app/SDLControllerManager.java

@@ -88,6 +88,8 @@ public class SDLControllerManager
         }
         int sources = device.getSources();
 
+        /* This is called for every button press, so let's not spam the logs */
+        /**
         if ((sources & InputDevice.SOURCE_CLASS_JOYSTICK) == InputDevice.SOURCE_CLASS_JOYSTICK) {
             Log.v(TAG, "Input device " + device.getName() + " is a joystick.");
         }
@@ -97,6 +99,7 @@ public class SDLControllerManager
         if ((sources & InputDevice.SOURCE_GAMEPAD) == InputDevice.SOURCE_GAMEPAD) {
             Log.v(TAG, "Input device " + device.getName() + " is a gamepad.");
         }
+        **/
 
         return (((sources & InputDevice.SOURCE_CLASS_JOYSTICK) == InputDevice.SOURCE_CLASS_JOYSTICK) ||
                 ((sources & InputDevice.SOURCE_DPAD) == InputDevice.SOURCE_DPAD) ||

src/joystick/SDL_gamecontroller.c

@@ -919,6 +919,15 @@ static ControllerMapping_t *SDL_PrivateGetControllerMapping(int device_index)
         mapping = s_pXInputMapping;
     }
 #endif
+#if defined(__ANDROID__)
+    if (!mapping && SDL_SYS_IsDPAD_DeviceIndex(device_index)) {
+        SDL_bool existing;
+        char mapping_string[1024];
+        SDL_snprintf(mapping_string, sizeof(mapping_string), "none,%s,a:b0,b:b1,dpdown:b12,dpleft:b13,dpright:b14,dpup:b11,", name);
+        mapping = SDL_PrivateAddMappingForGUID(guid, mapping_string,
+                          &existing, SDL_CONTROLLER_MAPPING_PRIORITY_DEFAULT);
+#endif /* __ANDROID__ */
+    }
     SDL_UnlockJoysticks();
     return mapping;
 }

src/joystick/SDL_sysjoystick.h

@@ -126,6 +126,11 @@ extern SDL_JoystickGUID SDL_SYS_JoystickGetGUID(SDL_Joystick * joystick);
 extern SDL_bool SDL_SYS_IsXInputGamepad_DeviceIndex(int device_index);
 #endif
 
+#if defined(__ANDROID__)
+/* Function returns SDL_TRUE if this device is a DPAD (maybe a TV remote) */
+extern SDL_bool SDL_SYS_IsDPAD_DeviceIndex(int device_index);
+#endif
+
 #endif /* SDL_sysjoystick_h_ */
 
 /* vi: set ts=4 sw=4 expandtab: */

src/joystick/android/SDL_sysjoystick.c

@@ -143,7 +143,13 @@ keycode_to_SDL(int keycode)
             button = SDL_CONTROLLER_BUTTON_DPAD_RIGHT;
             break;
         case AKEYCODE_DPAD_CENTER:
-            button = SDL_CONTROLLER_BUTTON_MAX+4; /* Not supported by GameController */
+            /* This is handled better by applications as the A button */
+            /*button = SDL_CONTROLLER_BUTTON_MAX+4; /* Not supported by GameController */
+            button = SDL_CONTROLLER_BUTTON_A;
+            break;
+
+        case AKEYCODE_BACK:
+            button = SDL_CONTROLLER_BUTTON_B;
             break;
 
         /* More gamepad buttons (API 12), these get mapped to 20...35*/
@@ -640,6 +646,11 @@ SDL_JoystickGUID SDL_SYS_JoystickGetGUID(SDL_Joystick * joystick)
     return guid;
 }
 
+SDL_bool SDL_SYS_IsDPAD_DeviceIndex(int device_index)
+{
+    return JoystickByDevIndex(device_index)->naxes == 0;
+}
+
 #endif /* SDL_JOYSTICK_ANDROID */
 
 /* vi: set ts=4 sw=4 expandtab: */