Question

我对通知和前台任务有几个问题。首先，这是我的服务：

public class NFCUploadService extends Service implements MeasureDataPostCallback {
    private static final int IMAGE_SEND_NFC_SERVICE_ID = 100;

    @Override
    public void onCreate() {
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        if (intent.getAction().equals(ForegroundServiceTags.STARTFOREGROUND_ACTION.getValue())) {
            String email = intent.getStringExtra(Globals.KEY_EMAIL);
            String password = intent.getStringExtra(Globals.KEY_PASSWORD);
            String year = intent.getStringExtra(Globals.KEY_YEAR);
            String month = intent.getStringExtra(Globals.KEY_MONTH);
            String day = intent.getStringExtra(Globals.KEY_DATE);
            String hour = intent.getStringExtra(Globals.KEY_HOUR);
            String minute = intent.getStringExtra(Globals.KEY_MINUTE);
            String value = intent.getStringExtra(Globals.KEY_VALUE);
            String mealTime = intent.getStringExtra(Globals.KEY_MEALTIME);
            String mood = intent.getStringExtra(Globals.KEY_MOOD);
            File imageFile = null;

            if(intent.getStringExtra(Globals.KEY_FILE_PATH) != null) {
                imageFile = new File(intent.getStringExtra(Globals.KEY_FILE_PATH));
            }

            MeasureDataPostTask task = new MeasureDataPostTask(email, password, year, month, day, hour, minute, value, mealTime, mood, imageFile);
            task.setCallback(this);
            task.execute(this);

            Notification.Builder builder = new Notification.Builder(this);
            builder.setContentTitle("Progress");
            builder.setContentText("Sending Data...");
            builder.setTicker("Notification!");
            builder.setWhen(System.currentTimeMillis());
            builder.setSmallIcon(R.drawable.ic_launcher);
            builder.setOngoing(true);
            Notification notification = builder.build();

            this.startForeground(IMAGE_SEND_NFC_SERVICE_ID, notification);
        }

        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onMeasureDataPostCompleted(StatusMeasureDataPost status, MeasureDataPostPOJO measureDataPostPojo) {
        Notification.Builder builder = new Notification.Builder(this);
        builder.setContentTitle("Progress");
        builder.setTicker("Notification!");
        builder.setWhen(System.currentTimeMillis());
        builder.setSmallIcon(R.drawable.ic_launcher);
        builder.setOngoing(true);

        switch(status) {
        case ERROR_CONNECTION_FAILED:
            builder.setContentText("Connection Failed");
            break;
        case ERROR_DB_CONNECTION_FAILED:
            builder.setContentText("DB Connection Failed");
            break;
        case ERROR_IO_EXCEPTION:
            builder.setContentText("IO Exception");
            break;
        case ERROR_JSON_EXCEPTION:
            builder.setContentText("JSON Exception");
            break;
        case ERROR_MEASUREDATA_ALREADY_EXISTS:
            builder.setContentText("Data already exists");
            break;
        case ERROR_PROTOCOL_EXCEPTION:
            builder.setContentText("Protocol Exception");
            break;
        case ERROR_WRONG_PARAMETERS:
            builder.setContentText("Wrong Parameters");
            break;
        case MEASUREDATA_TRANSFER_SUCCESSFUL:
            builder.setContentText("Transfer complete");
            break;
        }

        Notification notification = builder.build();

        this.startForeground(IMAGE_SEND_NFC_SERVICE_ID, notification);
    }
}

只要我的AsyncTask（MeasureDataPostTask）没有完成，我希望我的服务是不可杀戮的。这意味着我不希望用户能够在Android设备的通知选项卡中滑动通知。

AsyncTask结束后（调用onMeasureDataPostCompleted时）我希望我的通知更改，我想打印出结果消息并使通知可用。用户应该能够在AsyncTask完成后刷掉通知，但不能在它运行时滑动。我怎样才能做到这一点？

稍后我还想添加一种机制，当缺少互联网连接导致AsyncTask失败时，每5分钟重复一次AsyncTask。

Answer 1

首先，您可以从startForeground()致电onStartCommand()。

要重复AsyncTask，您应该设置一个重新发送STARTFOREGROUND_ACTION意图的闹钟。

前台服务中的通知

1 个答案: