[Android] Make the MotionAlertDialog private. This isn't needed to be…

… protected anymore. The only reason it was protected was for when the input settings were coupled as all hell to the GameListActivity (lol). Also documented the interface method within it.

Source/Android/src/org/dolphinemu/dolphinemu/settings/InputConfigFragment.java

@@ -208,7 +208,7 @@ public void onAttach(Activity activity)
 	 * to be set anonymously, so the creation of an explicit class for
 	 * providing functionality is not necessary.
 	 */
-	protected static final class MotionAlertDialog extends AlertDialog
+	private static final class MotionAlertDialog extends AlertDialog
 	{
 		private OnMotionEventListener motionListener;
 
@@ -229,6 +229,13 @@ public MotionAlertDialog(Context ctx)
 		 */
 		public interface OnMotionEventListener
 		{
+			/**
+			 * Denotes the behavior that should happen when a motion event occurs.
+			 * 
+			 * @param event Reference to the {@link MotionEvent} that occurred.
+			 * 
+			 * @return true if the {@link MotionEvent} is consumed in this call; false otherwise.
+			 */
 			boolean onMotion(MotionEvent event);
 		}
 
@@ -245,7 +252,7 @@ public void setOnMotionEventListener(OnMotionEventListener listener)
 		@Override
 		public boolean dispatchKeyEvent(KeyEvent event)
 		{
-			if (this.onKeyDown(event.getKeyCode(), event))
+			if (onKeyDown(event.getKeyCode(), event))
 				return true;
 
 			return super.dispatchKeyEvent(event);