android - 与 Android 中的 AsyncTask 通信？

Question

我在我的 AsyncTask 中运行一个套接字客户端。我需要找到一种方法来调用外部发送。例如:socketClient.send(msg); SocketClient 是在 service 中定义的。当 UI 发送一个 broadcast 并且 service 接收 它时，将调用 Send。到目前为止，我所有的尝试都导致应用程序崩溃。

这是我的代码:

public class SocketClient extends AsyncTask<Void, Void, Void> {
    private String ip;
    private int port;
    private Socket socket = null;
    private BufferedReader in = null;
    private PrintWriter out = null;
    private boolean connected;

    String devID;

    public SocketClient(String ip, int port, String devID){
        this.ip = ip;
        this.port = port;
        this.devID = devID;

        connected = true;
    }

    @Override
    protected Void doInBackground(Void... arg0){
        try{
            socket = new Socket(ip, port);
        } catch(Exception ex){
            socket = null;
        }

        try{
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            out = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()));

            send(new SocketMessage("ident", "sdas", "", ""));

            while(connected) {
                SocketMessage msg = new SocketMessage(in.readLine());
                handle(msg);
            }

            //clean up
            out.println(new SocketMessage("quit", "","", ""));
            out.flush();
        } catch(Exception ex){
            ex.printStackTrace();
        }
        finally{
            try{
                connected = false;
                out.close();
                in.close();
                socket.close();
            }catch(Exception ex){
                ex.printStackTrace();
            }
        }

        return null;
    }

    public void handle(SocketMessage msg){

    }

    public synchronized void send(SocketMessage msg){
        out.println(msg.getJSON());
        out.flush();
    }
}

Answer 1

AsyncTask 不是为长时间运行的进程设计的。在那种情况下，您最好使用 Thread。请参阅 Connecting Techniques 的开发人员指南.