重新启动手机后警报通知数据消失

Question

我正在构建一个通知应用程序，它使用警报管理器设置多个通知来提醒用户的日常任务，当手机打开一切都很好，但当重新启动手机时，通知会出现，但通知数据会丢失（例如通知内容），这些数据从我的第一个活动中保存到意图中，这是下面的代码。（

public class add_rreminde extends AppCompatActivity implements View.OnClickListener{

private int notificationId=1;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_add_rreminde);

    //buton ok
    findViewById(R.id.but).setOnClickListener(this);
    findViewById(R.id.cancel).setOnClickListener(this);
}
@Override
public void onClick(View view){

    EditText remide=findViewById(R.id.edit);
    DatePicker date=findViewById(R.id.date);

    Intent intent=new Intent(add_rreminde.this,AlarmReciver.class);
    intent.putExtra("notificationId",notificationId);
    intent.putExtra("todo",remide.getText().toString());
    final int _id=(int)System.currentTimeMillis();
    PendingIntent alarmIntent=PendingIntent.getBroadcast(add_rreminde.this,_id,intent,PendingIntent.FLAG_ONE_SHOT);

    AlarmManager alarm=(AlarmManager)getSystemService(ALARM_SERVICE);
    switch (view.getId()){
        case(R.id.but):
            int day=date.getDayOfMonth();
            int month=date.getMonth();
            int year=date.getYear();

            //create date
            Calendar startDate=Calendar.getInstance();
            startDate.set(Calendar.DAY_OF_MONTH,day);
            startDate.set(Calendar.MONTH,month);
            startDate.set(Calendar.YEAR,year);
            Long alarmStartDate=startDate.getTimeInMillis();

            //setAlarme
            alarm.set(AlarmManager.RTC_WAKEUP,alarmStartDate,alarmIntent);

            Toast.makeText(getApplicationContext(),"done",Toast.LENGTH_LONG).show();
            break;
        case (R.id.cancel):
            alarm.cancel(alarmIntent);
            Toast.makeText(getApplicationContext(),"canceled",Toast.LENGTH_LONG).show();
            break;
    }


}
  }

我的推送通知接收器

public class AlarmReciver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
    //get id from notification id intent
    int notification =intent.getIntExtra("notificationId",0);
    String getMessage=intent.getStringExtra("todo");

    //when notification is opened open mainActivity
    Intent mainIntent=new Intent(context,add_rreminde.class);
    PendingIntent contentIntent=PendingIntent.getActivity(context,0,mainIntent,0);

    NotificationManager mynotificationManager=(NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);

    //prepare notification
    Notification.Builder builder=new Notification.Builder(context);
    builder.setSmallIcon(R.drawable.assistant)
            .setContentTitle("changer oil")
            .setContentText(getMessage)
            .setWhen(System.currentTimeMillis())
            .setAutoCancel(true)
            .setContentIntent(contentIntent)
            .setPriority(Notification.PRIORITY_MAX)
            .setDefaults(Notification.DEFAULT_ALL);

    //notify
    mynotificationManager.notify(notification,builder.build());

}
}

Answer 1

默认情况下，当设备关闭时，所有警报都会被取消。为防止这种情况发生，您可以将应用程序设计为在用户重新启动设备时自动重新启动重复警报。

因此，您可以添加一个BroadcastRecader来接收ACTION_BOOT_COMPLETED

首先：

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

和：

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

现在，在设备重新启动时再次设置警报：

public class SampleBootReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {
            // Set the alarm here.
        }
    }
}