将数据从活动传递到 BroadcastReceiver 会导致 NullPointerException

Question

我有一个 BroadcastReceiver，它通过 Intent 从 Activity 获取数据， 带有 PendingIntent。

发送数据：

Intent intent = new Intent(addOne.this,AlarmReceiver.class);

intent.putExtra("msg", title.getText().toString());
intent.putExtra("note", note.getText().toString());
int id =...;

PendingIntent alarmIntent = PendingIntent.getBroadcast(getApplicationContext(), id, intent, PendingIntent.FLAG_UPDATE_CURRENT);
alarmMgr.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), alarmIntent);

获取数据：

@Override
public void onReceive(Context context2, Intent intent) {

       String msg=intent.getStringExtra("msg");
       String title=intent.getStringExtra("msg");
       ...
}

当 onReceive 被调用时，我得到一个 NullPointerException。

我的广播接收器清单：

    <receiver android:name=".AlarmReceiver" android:enabled="true">
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
        </intent-filter>
    </receiver>

Answer 1

使您的待定意图如下行并尝试

PendingIntent alarmIntent = PendingIntent.getBroadcast(getApplicationContext(), id, intent, PendingIntent.FLAG_CANCEL_CURRENT);