更新用户界面安卓

Question

在写这篇文章之前，我查看了其他帖子，但没有找到任何解决方案，我将不胜感激。

在应用程序启动器类的 onCreate 方法中，创建一个线程 TCPServer 并显示一个包含信息的表。问题是此信息会有所不同，并且当线程检测到 TCPServer 已发送新的消息控件时，必须更新此信息。

然后，如果我表达得好，我就会显示代码。

//launcher class
public class profesor extends Activity implements OnClickListener {
    static TableLayout alumnsTable; 
    @Override
    public void onCreate(Bundle savedInstanceState) {               
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        .
        .
        .
        Thread serverThread = new Thread(null, new TCPServer(), "BackgroundService");
        serverThread.start();
        .
        .
        .       
        //information is added to the table        
        alumnsTable = (TableLayout)findViewById(R.id.alumnsTable);
        List<Alumnos> listaAlumnos = Alumnos.ReadList();
        for(Alumnos al:listaAlumnos){
            alumnsTable.addView(filaAlumno(al));
        }  
    }
    //Eliminates the above information and reloads the table with the new information
    public void actualiza(){
        alumnsTable.removeAllViews();
        setContentView(R.layout.main);
        alumnsTable = (TableLayout)findViewById(R.id.alumnsTable);                          
         List<Alumnos> listaAlumnos = Alumnos.ReadList();                                                                                                   
        for(Alumnos al:listaAlumnos){
            alumnsTable.addView(filaAlumno(al));
        }
    }
}

//TCPServer class
public class TCPServer implements Runnable {
    private static Handler handler = new Handler();

    public void run() {
    ServerSocket serverSocket;
    String file;
    int filesizeMb = 4;
    int filesize = filesizeMb * (1024 * 1024); // filesize temporary hardcoded

    int bytesRead;
    int current = 0;
    try {
        serverSocket = new ServerSocket(profesor.COMUNICATION_PORT);
        Log.d(profesor.LOG_TAG,"S: Servidor Iniciado.");
        while (true) {
            final Socket sock = serverSocket.accept();
            String ClientAddr=sock.getInetAddress().toString();
            ClientAddr = ClientAddr.substring(ClientAddr.indexOf('/') + 1, ClientAddr.length());
            final String contacto=DeviceList.getDeviceName(ClientAddr);
            Log.d(profesor.LOG_TAG,"S: Conectado con: " + ClientAddr);
            // Conection type
            DataInputStream dis = new DataInputStream(sock.getInputStream());
            final String connectionType =dis.readUTF();
            Log.d(profesor.LOG_TAG,"S: Tipo de Conexion " + connectionType);
            .
            .
            .
            .
            // RECEIVING CONTROL MESSAGE
            if (connectionType.contains("CONTROL")) {
                String ControlText =dis.readUTF();
                String[] Control = ControlText.split(":");
                Log.d(profesor.LOG_TAG,"S: Recibido nuevo progreso de prueba. IP: "+Alumnos.getIdAlumno(ClientAddr)+"->"+Integer.parseInt(Control[0])+" ->"+Integer.parseInt(Control[1]));
                Alumnos.setProgress(Alumnos.getIdAlumno(ClientAddr), Integer.parseInt(Control[0]), Integer.parseInt(Control[1]));

                /****************************************************/
                //Here is where I need to call the update method of the
                //class teacher to delete the old data and fill the table
                //again.
                /****************************************************/
            }   
            dis.close();
            sock.close();
        }
        } catch (IOException e) {
            Log.d(profesor.LOG_TAG, "IOException"+e);
            e.printStackTrace();
        }
    }
}

谁能给我一些想法？，我已经看到了示例处理程序，但没有在类声明和另一个调用中。

我希望你明白我的意思，我的英语不是很好。

感谢您的帮助

Answer 1

您可以尝试使用处理程序或活动引用创建 TCPServer，然后在要更新 UI 时使用它：

refHandler.post(new Runnable(){
    public void run() {
        //Update
    }
});
refActivity.runOnUiThread(new Runnable() {
    public void run() {
       //Update
    }
});

Answer 2

使用 runOnUiThread 从 Thread 更新 UI：

// RECEIVING CONTROL MESSAGE
            if (connectionType.contains("CONTROL")) {
                String ControlText =dis.readUTF();
                String[] Control = ControlText.split(":");
                Log.d(profesor.LOG_TAG,"S: Recibido nuevo progreso de prueba. IP: "+Alumnos.getIdAlumno(ClientAddr)+"->"+Integer.parseInt(Control[0])+" ->"+Integer.parseInt(Control[1]));
                Alumnos.setProgress(Alumnos.getIdAlumno(ClientAddr), Integer.parseInt(Control[0]), Integer.parseInt(Control[1]));

                /****************************************************/
                //Here is where I need to call the update method of the
                //class teacher to delete the old data and fill the table
                //again.
                /****************************************************/
    profesor.this.runOnUiThread(new Runnable() {
        @Override
        public void run() {
            // refresh ui here
        }
    });
        }