startActivityForResult 到一个类并让该类将数据返回到另一个类？

Question

我有 3 个类：MainActivity、HighScoreActivity 和 GameScreenActivity。我想通过MainActivity进入GameScreenActivity，然后在游戏结束后，将分数传给HighScoreActivity。一切都成功地传递给了 GameScreenActivity，但它没有传递到 HighScoreActivity 中的 onActivityResult。

我相信这是因为 MainActivity 具有 startActivityForResult，所以 GameScreenActivity 的 finishQuiz() 期望将其数据返回给 MainActivity。如何将 GameScreenActivity 的数据传递给 HighScoreActivity？

MainActivity()

    MainActivity(){
    ...
        private void startQuiz() {
            String difficulty = spinnerDifficulty.getSelectedItem().toString();

            Intent intent = new Intent(getBaseContext(), GameScreenActivity.class);
            intent.putExtra(EXTRA_DIFFICULTY, difficulty);
            startActivityForResult(intent, REQUEST_CODE_QUIZ);
        }
    }

GameScreenActivity()

    GameScreenActivity(){
    ...
        private void finishQuiz(){
            Intent resultIntent = new Intent(getBaseContext(), 
    HighScoreActivity.class);
            resultIntent.putExtra(EXTRA_SCORE, score);
            resultIntent.putExtra(EXTRA_DIFFICULTY, difficulty);
            setResult(RESULT_OK, resultIntent);
            startActivity(resultIntent);
        }
    }

HighScoreActivity()

    HighScoreActivity(){
    ...
        @Override
        protected void onActivityResult(int requestCode, int resultCode, 
    Intent data) {
            super.onActivityResult(requestCode, resultCode, data);

            if (requestCode == REQUEST_CODE_QUIZ){
                if (resultCode == RESULT_OK) {
                    int score = data.getIntExtra(GameScreenActivity.EXTRA_SCORE, 0);
                    String difficulty = data.getStringExtra(GameScreenActivity.EXTRA_DIFFICULTY);
                    if (score > highScore10) {
                        updateHighscore(score, difficulty);
                    }
                }
            }
        }
    }

------------------------------------------ -----------------

尝试使用广播方法：

带有广播方法的GameScreenActivity()

    GameScreenActivity(){
    ...
        private void finishQuiz(){
            Log.d("sender", "Broadcasting message");
            Intent intent = new Intent("scoreEvent");
            intent.putExtra(EXTRA_DIFFICULTY, difficulty);
            intent.putExtra(EXTRA_SCORE, score);
            LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
            sendBroadcast(intent);
            Intent goToHighScores = new Intent(getBaseContext(), HighScoreActivity.class);
            startActivity(goToHighScores);
        }
    }

HighScoreActivity() 与广播方法

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

            LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver,
                    new IntentFilter("scoreEvent"));
        }


        @Override
        protected void onActivityResult(int requestCode, int resultCode, 
    Intent data) {
            super.onActivityResult(requestCode, resultCode, data);

            if (requestCode == REQUEST_CODE_QUIZ){
                if (resultCode == RESULT_OK) {
                    int score = data.getIntExtra(GameScreenActivity.EXTRA_SCORE, 0);
                    String difficulty = data.getStringExtra(GameScreenActivity.EXTRA_DIFFICULTY);
                    if (score > highScore10) {
                        updateHighscore(score, difficulty);
                    }
                }
            }
        }

        private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                String message = intent.getStringExtra("message");
                Log.d("receiver", "Got message: " + message);
            }
        };

        @Override
        protected void onDestroy() {
            LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);
            super.onDestroy();
        }
    }

Answer 1

考虑到HighScoreActivity 正在运行， 您可以使用LocalBroadcastManager 在HighScoreActivity 和IntentFilter 中注册本地广播接收器。另外，别忘了注销onDestroy()

现在，从 GameScreenActivity 改为 sendBroadcast()，而不是 setResult

希望这会有所帮助。编码愉快！