8

メッセージがソケットに送信されたら、トーストを表示したい。この後、 "Log.d（" ClientActivity "、" C：Sent。 "）;"

Toastを表示するために別のスレッドを作成する必要があるかどうか。

public class ClientActivity extends Activity {
private Handler handler = new Handler();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.client);
    serverIp = (EditText) findViewById(R.id.EditText01);
    message =(EditText) findViewById(R.id.EditText02);
    connectPhones = (Button) findViewById(R.id.Button01);

}

    public void Click1(View v) {
        if (!connected) {
            serverIpAddress = serverIp.getText().toString();
            if (!serverIpAddress.equals("")) {
                Thread cThread = new Thread(new ClientThread());
                cThread.start();
            }
        }
    }


private class ClientThread implements Runnable {

    public void run() {
        try {
            InetAddress serverAddr = InetAddress.getByName(serverIpAddress);
            Log.d("ClientActivity", "C: Connecting...");
            Socket socket = new Socket(serverAddr, ServerActivity.SERVERPORT);
            connected = true;
            while (connected) {
                try {
                    if(i>5)
                    {


                    } 
                    else
                    {   
                        Log.d("ClientActivity", "C: Sending command.");
                        PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket
                                .getOutputStream())), true);
                        // where you issue the commands
                        message1= message.getText().toString();
                        out.println(message1);
                        i=i+1;
                        Log.d("ClientActivity", "C: Sent.");
                    }    
                } catch (Exception e) {
                    Log.e("ClientActivity", "S: Error", e);
                }
            }
            socket.close();
            Log.d("ClientActivity", "C: Closed.");
        } catch (Exception e) {
            Log.e("ClientActivity", "C: Error", e);
            connected = false;
        }
    }
}

}

4

4 に答える 4

21

置く

  runOnUiThread(new Runnable() {
                 public void run() {

                     Toast.makeText(ClientActivity.this,"asdf",Toast.LENGTH_LONG).show();
                }
            });

この行の後

  Log.d("ClientActivity", "C: Connecting...");
于 2012-05-16T01:51:33.557 に答える
3 
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
    @Override
    public void run() {
        System.out.println("I'm in handler");
        Toast.makeText(YourActivity.this, "This is a toast", Toast.LENGTH_SHORT).show(); 
    }
}, 1000);
于 2012-05-16T04:53:35.760 に答える
3

You cannot create a toast from inside a thread. Because this new thread does not have access to the getApplicationContext() that you pass on to it. You somehow have to establesh a communication with the UI thread(i.e the main thread).
So whenever you want to toast something do it in the handler.Post(Runnable) method. Handler is the middle man between the UI thread and the separate thread that you are running. All UI Operations will have to be done in handler.Post(Runnable)'s run() method.

So in your activity to display a toast do this : 

private class ClientThread implements Runnable {

    public void run() {
        try {
            InetAddress serverAddr = InetAddress.getByName(serverIpAddress);
             .....
             .....
              message1= message.getText().toString();
                        out.println(message1);
                        i=i+1;
                        Log.d("ClientActivity", "C: Sent.");
                        handler.post(new Runnable(){
                          public void run()
                          {
                             Toast.make(....);
                           }
                         });

Don't forget to declare and initialize a handler object in your main activity(outside the thread)

handler=new Handler();
于 2012-05-17T09:59:59.613 に答える
1

最初にグローバルハンドラーを宣言し、

Handler handler=null;

次に、このようにonCreate（）でハンドラーを作成します。

Handler handler=new Handler()
{
  public void handleMessage(Message msg)
{
  if(msg.what==0)
{
   Toast.makeText(ClientActivity.this,"Your Toast Mesage Goes here",Toast.LENGTH_LONG).show();
}

}
};

そして今あなたのRunnableクラスでこの行を後に追加してください"Log.d("ClientActivity", "C: Sent.");" 

handler.sendEmptyMessage(0);

あなたが直面している問題は、ランナブルからUIを更新できないためです。ハンドラーはメインUIに接続します。したがって、Runnableからハンドラーにメッセージを渡す必要があります。

于 2012-05-16T04:20:20.800 に答える