android.os.NetworkOnMainThreadException 如何调整它在单独线程中运行的代码

Question

我正在开发一种软件，PC 和移动设备可以与服务器通信。当我运行来自 JAVA 桌面应用程序的代码时，它给了我以下错误 android.os.NetworkOnMainThreadException

我试图将我的 class 实现为一个线程，但我认为我没有做对。它仍然给我错误

如果有任何支持，我会很高兴。

class ServerAccessMobile 负责所有网络工作，它有两种 public 方法，一种用于从服务器获取数据，一种用于在服务器上设置数据

这就是我想从任何 Activity / Service

执行它的方式

ServerAccessMobile serverAccessMobile = new ServerAccessMobile();
ArrayList <String> dataFromServer = **serverAccessMobile.getDataFromServer()**;

ArrayList <String> dataToSend = .....

**serverAccessMobile.setDataOServer(dataToSend)**;

这是 class ServerAccessMobile

的代码

public class ServerAccessMobile {

    // private variables
    private ObjectOutputStream outputStream; 
    private ObjectInputStream inputStream; 
    ...

    // constructor
    public ServerAccessMobile(String arg1)
    {
        ...
    } 

    **private ArrayList<String> run(ArrayList<String> messageToSendList)**
    {
        ArrayList <String> receivedMessageList = new ArrayList <String> ();

        try // connect to server, get streams, process connection
        {
            connectToServer(); // create a Socket to make connection

            getStreams(); // get the input and output streams

            sendData(messageToSendList);

            receivedMessageList = processConnection();
        }
        catch ( EOFException eofException )
        {
            System.out.println("\n terminated connection");
        } 
        catch ( IOException ioException )
        {
            ioException.printStackTrace();
        } 
        finally
        {
            closeConnection(); // close connection
        } 

        return receivedMessageList;
    } 

    public ArrayList <String > getDataFromServer(){

        ArrayList< String > commandMessage = new  ArrayList< String > ();
        commandMessage.add("GETDATA");

        ArrayList< String > receivedMessageList = new  ArrayList< String > ();

        // start server communication
        receivedMessageList = **run(commandMessage);**
    }

    public void setDataOnServer(ArrayList <String> messageToSendList){

        // start server communication
        **run(messageToSendList);**
    }
}

现在我的问题，

运行() 方法中的代码应该运行在单独的线程中，而不是 ui 线程中我该如何正确实施？

谢谢你

Answer 1

您可以在以下link找到有关线程的详细说明：http://developer.android.com/guide/components/processes-and-threads.html#Threads

你可以这样做

new Thread(new Runnable() {
    public void run() {
        ServerAccessMobile serverAccessMobile = new ServerAccessMobile(); 

    ArrayList <String> dataFromServer = **serverAccessMobile.getDataFromServer()**;

    ArrayList <String> dataToSend = .....

    serverAccessMobile.setDataOServer(dataToSend);
    }
}).start();

如果您想从此线程更新 UI，则必须调用 view.post(Runnable) 方法。

android.os.NetworkOnMainThreadException 如何调整它在单独线程中运行的代码

android.os.NetworkOnMainThreadException how to adapt this code that it runs in a seperate thread

java

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network-programming