java - 难以理解 Intent 的工作原理

我是一个在Android Studio中进行测验的noobie，我正在尝试在活动之间传递一个整数，以增加最后他们正确的问题数量，但是在第二个活动中，当我回答第一个活动时，它并没有改变问题正确。

Question1 activity:

    public class Question1 extends AppCompatActivity {

        public int correctAnswers = 0;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_question1);

            Intent intent = new Intent(Question1.this, Question2.class);
            Intent i = getIntent();
            Intent answersCorrect = new Intent(Question1.this, Question2.class);
            answersCorrect.putExtra("correctAnswers", correctAnswers);
        }
                    public void submitQuestion1(View view) {
            EditText question1TextInput = (EditText) findViewById(R.id.question1TextInput);
            if (question1TextInput.getText().toString().length() >= 1) {
                startActivity(new Intent(Question1.this, Question2.class));
                if (question1TextInput.getText().toString().toUpperCase().contentEquals("FATHER")) {
                    correctAnswers += 1;
                    Intent answersCorrect = new Intent(Question1.this, Question2.class);
                    answersCorrect.putExtra("correctAnswers", correctAnswers);
                }
            }
        }
    }

Question2活动：

public class Question2 extends AppCompatActivity {

    public int correctAnswers;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_question2);
        Intent intent = getIntent();
        int number = intent.getIntExtra("correctAnswers", 0);
        TextView myAwesomeTextView = (TextView)findViewById(R.id.text);

        myAwesomeTextView.setText(String.valueOf(number));

    }
}

最佳答案

您在这里复制您的意图：

Intent intent = new Intent(Question1.this, Question2.class);
Intent i = getIntent();
Intent answersCorrect = new Intent(Question1.this, Question2.class);
answersCorrect.putExtra("correctAnswers", correctAnswers);

替换为：

Intent intent = new Intent(Question1.this, Question2.class);
intent.putExtra("correctAnswers", correctAnswers);
startActivity(intent);

在您的第二个活动中：

int correctAnswers;

correctAnswers = (int) getIntent().getIntExtra("correctAnswers", 0);