Question

我正在开发一个Android项目，我遇到了问题。

如果我实现以下代码，它可以正常工作。

new Thread(new Runnable() {

            @Override
            public void run() {
                try
                {
                    android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_BACKGROUND);
                    DatagramSocket datagramSocket = new DatagramSocket(8000);

                    byte[] buffer = new byte[1024];
                    DatagramPacket packet = new DatagramPacket(buffer, buffer.length);

                    while (true)
                    {
                        datagramSocket.receive(packet);

                        Log.v(TAG, new String(packet.getData(), 0, packet.getLength()));
                    }
                }
                catch (SocketException ex)
                {
                    Log.e(TAG, "Failed to bind socket. Exception: " + ex.toString());
                }
                catch (IOException ex)
                {
                    Log.e(TAG, "Failed to read socket data. Exception: "+ ex.toString());
                }
            }
        }).start();

我实际上要做的是创建一个实现runnable的类，但是当我尝试启动它时，我会得到NetworkOnMainThreadException的异常。

以下是我的课程

public class AddServerThread implements Runnable {

    private static final String TAG = "ADD SERVER THREAD";
    private boolean cancelThread = false;

    @Override
    public void run()
    {
        Log.d(TAG, "Listening for available servers");

        try
        {
            android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_BACKGROUND);
            DatagramSocket datagramSocket = new DatagramSocket(8000);

            byte[] buffer = new byte[1024];
            DatagramPacket packet = new DatagramPacket(buffer, buffer.length);

            while (!cancelThread)
            {
                datagramSocket.receive(packet);

                Log.v(TAG, new String(packet.getData(), 0, packet.getLength()));
            }
        }
        catch (SocketException ex)
        {
            Log.e(TAG, "Failed to bind socket. Exception: " + ex.toString());
        }
        catch (IOException ex)
        {
            Log.e(TAG, "Failed to read socket data. Exception: "+ ex.toString());
        }
    }

    public void cancelThread()
    {
        cancelThread = true;
    }
}

以下是我尝试启动帖子的方法

AddServerThread addServerThread = new AddServerThread();
        addServerThread.run();

我知道这个异常意味着什么，我不明白为什么它适用于第一种方法，但是当我使用实现Runnable I的类时，然后得到异常。

感谢您提供的任何帮助

Answer 1

在runnable上调用run不会启动新线程。您需要将其作为参数传递给线程。

Thread thread = new Thread（yourRunnable）; thread.start（）;

从类中启动runnable会导致NetworkOnMainThreadException

1 个答案: