Object return 当 BroadcastReceiver 上的 putExtra 和 getSerializable 时为 null

Question

我只想将标题弹出到通知中，但这是 return 空 object。我需要帮助，我的英语很糟糕希望大家同情:D.

错误：

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.example.a.Work.getTitle()' on a null object reference at com.example.a.AlertBrr.onReceive(AlertBrr.java:24)

CreateActivity.class

            Work work = new Work();
            work.setTitle(ctitle.getText().toString());
            work.setDate(edittext.getText().toString());
            work.setContent(ccontent.getText().toString());
            Database database = new Database(CreateActivity.this);
            database.add(work);
            //
            Intent intent = new Intent(CreateActivity.this, AlertBrr.class);
            intent.putExtra("work", work);
            PendingIntent pendingIntent = PendingIntent.getBroadcast(CreateActivity.this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
            AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
            alarmManager.set(AlarmManager.RTC_WAKEUP, myCalendar.getTimeInMillis(), pendingIntent);

AlertBrr.class:

public class AlertBrr extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Work work = (Work) intent.getSerializableExtra("work");

        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, "duong")
                .setContentTitle(work.getTitle())
                .setContentText(work.getContent())
                .setContentInfo(work.getDate())
                .setSmallIcon(R.drawable.done);

        NotificationManagerCompat managerCompat = NotificationManagerCompat.from(context);
        managerCompat.notify(100, builder.build());
    }
}

Answer 1

Ha Minh，我看过你的项目。感谢分享，帮了大忙！

要解决此问题，您必须将 Work 对象包装到 Bundle 中，然后将 Bundle 传递到 Intnet 中。 CreateActivity#onOptionsItemSelected 中的代码应如下所示：

Intent intent = new Intent(CreateActivity.this, AlertBrr.class);
Bundle bundle = new Bundle();
bundle.putSerializable("work", work);
intent.putExtra("work_bundle", bundle);

在AlertBrr#onReceive中：

Bundle workBundle = intent.getParcelableExtra("work_bundle");
Work work = (Work) workBundle.getSerializable("work");

注意：我得到了 Whosebug 答案的想法。

Object return 当 BroadcastReceiver 上的 putExtra 和 getSerializable 时为 null

Object return null when putExtra and getSerializable on BroadcastReceiver

android

broadcastreceiver

android-notifications