多次在非活动类中获取上下文

Question

I'm working on an app where an "updater" constantly asks for data from a server. If it receives new data, the data is sent via LocalBroadcast to an activity. For this purpose I need the current Context which i pass in the constructor. Furthermore, the new data is written to a Singleton class (to store it trough the runtime of the app).

The problem is, that I need constantly new Context for my LocalBroadcast but its only passed one time in the constructor. Does someone have an idea of how can I get the current context everytime the LocalBroadcast shall send something?

I found this answer but im always warned of putting context classes in static fields. ( Get application context from non activity singleton class )

Thanks for reading and for every advice. Here is my "Updater" Code:

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.support.v4.content.LocalBroadcastManager;

import java.util.Arrays;


public class ClientUpdater extends Thread {
    ClientCommunication cComm;              //this is my class which manages the Server-Client-Communication
    Intent BroadcastIntentUpdate;           //Intent for the LocalBroadcast
    Context cntxt;                          //stores the context passed in the constructor
    GlobalClass Obj1;                       //Instance of my Singleton

    public ClientUpdater(ClientCommunication cComm, Context context) {
        this.cComm = cComm;
        this.cntxt = context;
        BroadcastIntentUpdate = new Intent("update");
    }

    public void run(){
        while(true){

            String vomS1 = cComm.sendData("updateChat" + "~" + "$empty$");      //sends an update request to the server an receives the current chat-state
            if(!vomS1.equalsIgnoreCase("timeout")){

                Obj1 = GlobalClass.getInstance();
                String[] update = GlobalClass.decode(vomS1, ";");               //decodes the receives message                  
                String[] altchat = Obj1.getChat();                              //loads the stored chat protocoll from singleton


                if(!Arrays.equals(update, altchat)){                            //if the received message has new data...

                    BroadcastIntentUpdate.putExtra("message", update);
                    //for ".getInstance(cntxt)" the current Context is always needed right?
                    LocalBroadcastManager.getInstance(cntxt).sendBroadcast(BroadcastIntentUpdate);          //...it's sent to the activity
                    Obj1.setChat(update);                                                                                           //...and stored in the singleton
                }
            }    


            try {
                sleep(500);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

    }

}

Answer 1

Change

this.cntxt = context;

To

cntxt = context.getApplicationContext();

instead. Where cntxt is a static context. It will not create activity leak, since it uses application context.

It is better if you learn about background service in Android https://developer.android.com/training/run-background-service/create-service.html