android.os.NetworkOnMainThreadException - Web Socket

Question

我正在用"Web socket"测试聊天服务

代码没有出错。但是，当我打开应用程序时，它甚至无法用

启动。

错误

06-10 16:59:22.420: E/AndroidRuntime(10814): FATAL EXCEPTION: main
06-10 16:59:22.420: E/AndroidRuntime(10814): java.lang.RuntimeException: Unable to resume activity {com.websocketchat_test/com.websocketchat_test.WebsocketChat}: android.os.NetworkOnMainThreadException
06-10 16:59:22.420: E/AndroidRuntime(10814):    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2466)
06-10 16:59:22.420: E/AndroidRuntime(10814):    at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2494)
06-10 16:59:22.420: E/AndroidRuntime(10814):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2008)
06-10 16:59:22.420: E/AndroidRuntime(10814):    at android.app.ActivityThread.access$600(ActivityThread.java:123)
06-10 16:59:22.420: E/AndroidRuntime(10814):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1169)

我的主代码在这里…

public class WebsocketChat extends Activity implements View.OnClickListener{
private static String SERVER_HOST = "10.0.0.1";
private WebSocket websocket;
private EditText messageEditText;
private TextView logsTextView;
@Override
public void onCreate(Bundle savedInstanceState) {       
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    messageEditText = (EditText)this.findViewById(R.id.messageEditText);
    logsTextView = (TextView)this.findViewById(R.id.logsTextView);
    try {
        URI url  = new URI("ws://" + SERVER_HOST + "/");
        websocket = new WebSocketConnection(url);
        websocket.setEventHandler(new WebSocketEventHandler() {
            Handler handler = new Handler();
            public void onOpen() {
                updateLog("connected.");
            }
            public void onMessage(final WebSocketMessage message) {
                handler.post(new Runnable() {
                    public void run() {
                        updateLog(message.getText().trim());
                    }
                });
            }
            public void onClose() {
                updateLog("closed");
            }
        });
        View sendButton = this.findViewById(R.id.sendButton);
        sendButton.setOnClickListener(this);
    } catch (WebSocketException wse) {
        wse.printStackTrace();
    } catch (URISyntaxException use) {
        use.printStackTrace();
    }
} 
@Override
public void onResume() {
    super.onResume();
    try {
        websocket.connect();
    } catch (WebSocketException wse) {
        wse.printStackTrace();
    }
}
public void onClick(View view) {
    try {
        websocket.send(messageEditText.getText().toString());
        messageEditText.setText("");
    } catch (WebSocketException wse) {
        wse.printStackTrace();
    }
}
private void updateLog(String message) {
    logsTextView.setText("> " + message + "n" + logsTextView.getText());
}

}

我不知道为什么会发生这种事。我当然添加了上网权限…任何建议都可以。

Answer 1

最近的Android版本将不允许任何网络活动在你的主/UI线程。你可以看看AutobahnAndroid——一个Android/Java WebSocket实现，在后台线程上完成所有的网络连接。

披露:我是Autobahn的原作者，为Tavendo工作。