多次获取非activityclass的上下文

Question

我正在开发一个 "updater" 不断从服务器请求数据的应用程序。如果它接收到新数据，则通过 LocalBroadcast 将数据发送到 activity。为此，我需要在构造函数中传递的当前上下文。此外，新数据被写入单例 class（通过应用程序的运行时存储它）。

问题是，我的 LocalBroadcast 需要不断更新上下文，但它只在构造函数中传递了一次。有人知道每次 LocalBroadcast 发送内容时如何获取当前上下文吗？

我找到了这个答案，但我总是警告不要将上下文 classes 放在静态字段中。 (Get application context from non activity singleton class)

感谢阅读和每一个建议。这是我的 "Updater" 代码：

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

改变

this.cntxt = context;

到

cntxt = context.getApplicationContext();

相反。其中 cntxt 是静态上下文。它不会造成 activity 泄漏，因为它使用应用程序上下文。

后台服务最好在Android了解一下 https://developer.android.com/training/run-background-service/create-service.html

多次获取非activityclass的上下文

Get Context in non-activity class multiple times

java

android

android-context