java - Android:设置手机重启后的闹钟/提醒

Question

我正在开发一个集成了提醒功能的Android应用程序。如果手机保持开机状态，通知就会起作用，但是当我关闭或重新启动手机时，我会丢失所有警报。我知道这是Android功能来提高手机效率，但我不知道该怎么办，我该如何解决这个问题？

这是我的文件:

• AlarmService.java

• AlarmReceiver.java

• BootAlarmReceiver.java

• AndroidManifest.xml

当手机打开时，“BootAlarmReceiver.java”会调用“AlarmService.java”，它应该重新加载我的所有闹钟，但事实并非如此。当 AlarmManager 发出警报时，将调用“AlarmReceiver.java”。

代码如下:

AlarmService.java

public class AlarmService extends IntentService {
    public AlarmService() {
        super("AlarmService");
    }
@Override
protected void onHandleIntent(@Nullable Intent intent) {
    Calendar calendar = Calendar.getInstance();
    FileInputStream fileInputStream = null;
    int requestCode, year, month, day, hour, minute;
    String note, with;

    try {
        fileInputStream = openFileInput("my_alarms.csv");
        InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream);
        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
        String row;

        while ((row = bufferedReader.readLine()) != null) {
            String[] splittedRow = row.split(";");
            requestCode = Integer.valueOf(splittedRow[0]);
            year = Integer.valueOf(splittedRow[1]);
            month = Integer.valueOf(splittedRow[2]);
            day = Integer.valueOf(splittedRow[3]);
            hour = Integer.valueOf(splittedRow[4]);
            minute = Integer.valueOf(splittedRow[5]);
            note = splittedRow[6];
            with = splittedRow[7];

            calendar.set(Calendar.YEAR, year);
            calendar.set(Calendar.MONTH, month);
            calendar.set(Calendar.DAY_OF_MONTH, day);
            calendar.set(Calendar.HOUR_OF_DAY, hour);
            calendar.set(Calendar.MINUTE, minute);
            calendar.set(Calendar.SECOND, 0);

            AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
            Intent alarmIntent = new Intent(this, AlarmReceiver.class);
            alarmIntent.putExtra("note", note + "\nCon: " + with);
            alarmIntent.putExtra("title", "My Memo");
            alarmIntent.putExtra("alarm", "memo");

            //requestCode must be incremental to create multiple reminders
            PendingIntent pendingIntent = PendingIntent.getBroadcast(this, requestCode, alarmIntent, 0);

            if (calendar.before(Calendar.getInstance())) {
                calendar.add(Calendar.DATE, 1);
            }

            alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
        }

    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (fileInputStream != null) {
            try {
                fileInputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

}

AlarmReceiver.java

public class AlarmReceiver extends BroadcastReceiver {

    @RequiresApi(api = Build.VERSION_CODES.O)
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getStringExtra("alarm").equals("memo")) {
            NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                @SuppressLint("WrongConstant") NotificationChannel notificationChannel = new NotificationChannel("memo_channel", "My Memo", NotificationManager.IMPORTANCE_MAX);
                notificationChannel.setDescription("Memo Notification Channel");
                notificationChannel.enableLights(true);
                notificationChannel.setLightColor(Color.BLUE);
                notificationChannel.setVibrationPattern(new long[]{0, 1000, 500, 1000});
                notificationChannel.enableVibration(true);
                notificationManager.createNotificationChannel(notificationChannel);
            }
            NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context, "memo_channel");
            notificationBuilder.setAutoCancel(true)
                    .setDefaults(Notification.DEFAULT_ALL)
                    .setWhen(System.currentTimeMillis())
                    .setShowWhen(true)
                    .setTicker("Reminder")
                    .setContentTitle("Memo")
                    .setContentText(intent.getStringExtra("note"))
                    .setContentInfo("Information")
                    .setSmallIcon(R.drawable.ic_alarm);

            notificationManager.notify(1, notificationBuilder.build());
        }
    }
}

BootAlarmReceiver.java

public class BootAlarmReceiver extends BroadcastReceiver {

    @RequiresApi(api = Build.VERSION_CODES.O)
    @Override
    public void onReceive(Context context, Intent intent) {
            Intent alarmServiceIntent = new Intent(context, AlarmService.class);
            ComponentName service = context.startService(alarmServiceIntent);

            if (service == null) {
                Log.e("ALARM", "Could not start service");
            } else {
                Log.e("ALARM", "Could start service");
            }
        }
    }
}

AndroidManifest.xml

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

        //Other code here

        <receiver
            android:name=".BootAlarmReceiver"
            android:enabled="true">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
            </intent-filter>
        </receiver>
        <receiver android:name=".AlarmReceiver" />
        <service android:name=".AlarmService" />
    </application>
</manifest>

请帮助我，谢谢您的宝贵时间。

编辑

我在设备开启时发现此错误:

java.lang.RuntimeException: Unable to start receiver com.package.appname.BootAlarmReceiver: java.lang.IllegalStateException: Not allowed to start service Intent { act=REBOOT cmp=com.package.appname/.AlarmService }: app is in background uid UidRecord{a5a4cb2 u0a341 RCVR idle change:uncached procs:1 seq(0,0,0)}

我应该做什么？

Answer 1

解决方案:

大家好，我发现了我遇到的问题，我的代码是正确的并且工作正常，问题出在我设备的操作系统中，从 Android OS Oreo 开始服务的命令已更改并且是需要的新的命令语法:

更改位于“BootAlarmReceiver.java”

以前的代码:

public class BootAlarmReceiver extends BroadcastReceiver {

    @RequiresApi(api = Build.VERSION_CODES.O)
    @Override
    public void onReceive(Context context, Intent intent) {
            Intent alarmServiceIntent = new Intent(context, AlarmService.class);
            ComponentName service = context.startService(alarmServiceIntent);

            if (service == null) {
                Log.e("ALARM", "Could not start service");
            } else {
                Log.e("ALARM", "Could start service");
            }
        }
    }
}

新代码:

public class BootAlarmReceiver extends BroadcastReceiver {

    @RequiresApi(api = Build.VERSION_CODES.O)
    @Override
    public void onReceive(Context context, Intent intent) {
        if (Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) {

            Intent alarmServiceIntent = new Intent(context, AlarmService.class);

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                context.startForegroundService(alarmServiceIntent);
            } else {
                context.startService(alarmServiceIntent);
            }
        }
    }
}

因此，如果您在 Oreo 或更新版本上运行，则应使用 .startForegroundService(yourIntent)，否则应使用 .startService(yourIntent)。

这个解决方案应该也适合您。