merge draft to main

Author: NguyenAlan92

app/src/main/java/com/bignerdranch/android/geoquiz/QuizActivity.java

@@ -40,7 +40,7 @@ private void updateQuestion() {
     private void checkAnswer(boolean userPressedTrue) {
         boolean answerIsTrue = mQuestionBank[mCurrentIndex].isAnswerTrue();
 
-        int messageResId = 0;
+        int messageResId;
 
         if (userPressedTrue == answerIsTrue) {
             messageResId = R.string.correct_toast;