Question

我正在尝试从服务中获取数据，然后将其用于活动中。我已经how does a service return result to an activity和How to get data from service to activity进行了搜索，该解决方案无法正常工作。基本上，我的应用程序使用服务来显示时间，并且当用户关闭应用程序然后再次打开应用程序时，我想将服务中的时间提取到活动中以对该时间执行一些操作。这是下面的代码。我感谢有人能帮助我。谢谢

我的服务

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.media.RingtoneManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.support.v4.app.NotificationCompat;
import android.support.v4.content.LocalBroadcastManager;

import com.alexeducationchina.alexeducation.FullTime_KINDERGARTEN.Timer_FullTime_K;
import com.alexeducationchina.alexeducation.R;


import java.util.Timer;
import java.util.TimerTask;

import static com.alexeducationchina.alexeducation.App.CHANNEL_ID;

public class ServiceTimer_K extends Service {

    private   int THE_ID_TO_UPDATE = 1;
    private static Timer timer = new Timer();
    private Context ctx;
    private int second = 0 ;
    NotificationManager notificationManager ;
    private int minute = 0 ;
    private int hour = 0 ;

    //we are going to use a handler to be able to run in our TimerTask
    final Handler handler = new Handler();
    NotificationCompat.Builder notification ;
    @Override
    public void onCreate() {
        super.onCreate();
        super.onCreate();
        ctx = this;
    }


    private class mainTask extends TimerTask
    {
        public void run()
        {

            second = second + 1 ;

            if (second == 60){
                minute++ ;
                second = 0 ;
            }

            if (minute == 60){
                hour++;
                minute = 0 ;
                second = 0 ;

            }


            notification.setContentTitle( hour + "h " + minute + "m " + second+"s");



            notificationManager.notify(THE_ID_TO_UPDATE , notification.build());


        }
    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {


        if (timer != null){
            timer.cancel();
        }
        timer = new Timer( );

        //its nothing

/*
.putExtra("currentTime", hour + "h " + minute + "m " + second+"s");
        LocalBroadcastManager.getInstance(ctx).sendBroadcast(notificationIntent);

*/

        String input = intent.getStringExtra("inputExtra");

        Intent notificationIntent = new Intent(this, Timer_FullTime_K.class)
             .setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(this,
                0, notificationIntent, 0) ;



        notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        notification = new NotificationCompat.Builder(this, CHANNEL_ID);


        notification.setContentText("Kindergarten");
        notification.setSmallIcon(R.mipmap.logoback);
        notification.setOnlyAlertOnce(true);
        notification.setWhen(System.currentTimeMillis());
        notification.setPriority(Notification.PRIORITY_DEFAULT);
        notification.setContentIntent(pendingIntent);
        notification.setLights(Color.RED, 1000, 1000);
        notification.setVibrate(new long[]{0, 400, 250, 400});
        notification.setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION));



        notification.build();
        notificationManager.notify(THE_ID_TO_UPDATE , notification.build());
        startForeground(THE_ID_TO_UPDATE, notification.build());

        timer.scheduleAtFixedRate(new mainTask(), 0, 1000);



        return START_NOT_STICKY;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        timer.cancel();

    }

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


    private void sendBroadcast (boolean success){
        Intent intent = new Intent ("timeIncoming"); //put the same message as in the filter you used in the activity when registering the receiver
        intent.putExtra("currentTime", hour + "h " + minute + "m " + second+"s");
        LocalBroadcastManager.getInstance(ctx).sendBroadcast(intent);
    }


}

MyActivity

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.timer__full_time_k);

   LocalBroadcastManager.getInstance(this).registerReceiver(
                mMessageReceiver, new IntentFilter("timeIncoming"));

    }
    private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            // Get extra data included in the Intent
            String message = intent.getStringExtra("currentTime");

            Toast.makeText(context, "Current Time Has Come : " + message, Toast.LENGTH_SHORT).show();
        }
    };

上述方法对我不起作用，因此我决定将数据放入通知的目的，因此当我单击显示时间的通知时，我会在活动中获取数据。但是给我空

此处是我如何定义通知的意图

 Intent notificationIntent = new Intent(this, Timer_FullTime_K.class)
         .setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP).putExtra("currentTime", hour + "h " + minute + "m " + second+"s");
    LocalBroadcastManager.getInstance(ctx).sendBroadcast(notificationIntent);
    PendingIntent pendingIntent = PendingIntent.getActivity(this,
            0, notificationIntent, 0) ;

并将数据收集到活动中

//onCreate Method

try {
            Intent intent = getIntent() ;
            String message = intent.getStringExtra("currentTime");
            Toast.makeText(Timer_FullTime_K.this, "Current Time Has Come : " + message, Toast.LENGTH_SHORT).show();
        }catch(Exception c){

            Toast.makeText(this, "No Intent Found", Toast.LENGTH_SHORT).show();

        }

将数据从服务转变为活动

0 个答案: