java - 如何在应用程序关闭时建立服务器连接

Question

在我的 Android 应用程序中，我想建立一个服务器连接，它也应该在应用程序关闭时运行。目标是从服务器获取通知并显示在设备上

我尝试创建一个服务，在其中启动 ServerConnection-Thread，但当我关闭应用程序时线程停止。

public class InternetService extends Service {
 public static final String START_SERVER = "startserver";
  public InternetService(){

    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startID){
        String action = intent.getAction();
        if(action.equals(START_SERVER)){
            //new thread to start server in non-ui-thread
            Thread server = new Thread(new Server());
            server.start();
        }


        return START_STICKY;
    }
}

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    Intent server = new Intent(this, InternetService.class);
        server.setAction(InternetService.START_SERVER);
        startService(server);
    }
}


public class Server implements Runnable {
    public void run(){
        server = new Socket(IP_ADDRESS, PORT);
        out = new PrintWriter(server.getOutputStream());
        in = new BufferedReader(new InputStreamReader(server.getInputStream()));
    }
}

Answer 1

服务的行为随着版本的提高而改变。看看https://developer.android.com/about/versions/oreo/background

如果你想从服务器发送通知尝试使用 Firebase .