【发布时间】：2014-05-21 02:32:28
【问题描述】：
我正在做一个简单的应用程序，它使用 STOMP 协议和 Gozirra 库连接到 Activemq 服务器。
这是我的代码：
package com.example.stomp;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Logger;
import javax.security.auth.login.LoginException;
import net.ser1.stomp.Client;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
String activeMqIp = "10.5.0.121";
int port = 8161;
String channel = "/topic/VirtualTopic.app.event.sensor.object.behavior.change";
Client c;
try {
c = new Client(activeMqIp, port, "", "");
Log.i("telo", "Client connected on " + activeMqIp + ":" + port);
JavaStompClientSubscriberExample(c, channel);
} catch (IOException ex) {
ex.printStackTrace();
} catch (LoginException ex) {
ex.printStackTrace();
}
}
public void JavaStompClientSubscriberExample(Client c, String channel) {
Map header = new HashMap();
header.put("transformation", "jms-object-xml");
c.subscribe(channel, header);
Log.i("telo", "Subscribed to " + channel);
}
public void message(Map map, String message) {
Log.i("telo", "message received by STOMP listener\n" + message);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
}
这是我在 logcat 中的错误：
04-08 13:56:25.829: E/AndroidRuntime(10804): FATAL EXCEPTION: main
04-08 13:56:25.829: E/AndroidRuntime(10804): Process: com.example.stomp, PID: 10804
04-08 13:56:25.829: E/AndroidRuntime(10804): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.stomp/com.example.stomp.MainActivity}: android.os.NetworkOnMainThreadException
04-08 13:56:25.829: E/AndroidRuntime(10804): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
04-08 13:56:25.829: E/AndroidRuntime(10804): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
04-08 13:56:25.829: E/AndroidRuntime(10804): at android.app.ActivityThread.access$800(ActivityThread.java:135)
04-08 13:56:25.829: E/AndroidRuntime(10804): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
04-08 13:56:25.829: E/AndroidRuntime(10804): at android.os.Handler.dispatchMessage(Handler.java:102)
04-08 13:56:25.829: E/AndroidRuntime(10804): at android.os.Looper.loop(Looper.java:136)
04-08 13:56:25.829: E/AndroidRuntime(10804): at android.app.ActivityThread.main(ActivityThread.java:5017)
04-08 13:56:25.829: E/AndroidRuntime(10804): at java.lang.reflect.Method.invokeNative(Native Method)
04-08 13:56:25.829: E/AndroidRuntime(10804): at java.lang.reflect.Method.invoke(Method.java:515)
04-08 13:56:25.829: E/AndroidRuntime(10804): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
04-08 13:56:25.829: E/AndroidRuntime(10804): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
04-08 13:56:25.829: E/AndroidRuntime(10804): at dalvik.system.NativeStart.main(Native Method)
04-08 13:56:25.829: E/AndroidRuntime(10804): Caused by: android.os.NetworkOnMainThreadException
04-08 13:56:25.829: E/AndroidRuntime(10804): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1145)
04-08 13:56:25.829: E/AndroidRuntime(10804): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
04-08 13:56:25.829: E/AndroidRuntime(10804): at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
04-08 13:56:25.829: E/AndroidRuntime(10804): at libcore.io.IoBridge.connect(IoBridge.java:112)
04-08 13:56:25.829: E/AndroidRuntime(10804): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
04-08 13:56:25.829: E/AndroidRuntime(10804): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
04-08 13:56:25.829: E/AndroidRuntime(10804): at java.net.Socket.startupSocket(Socket.java:567)
04-08 13:56:25.829: E/AndroidRuntime(10804): at java.net.Socket.tryAllAddresses(Socket.java:128)
04-08 13:56:25.829: E/AndroidRuntime(10804): at java.net.Socket.<init>(Socket.java:178)
04-08 13:56:25.829: E/AndroidRuntime(10804): at java.net.Socket.<init>(Socket.java:150)
04-08 13:56:25.829: E/AndroidRuntime(10804): at net.ser1.stomp.Client.<init>(Client.java:48)
04-08 13:56:25.829: E/AndroidRuntime(10804): at com.example.stomp.MainActivity.onCreate(MainActivity.java:40)
04-08 13:56:25.829: E/AndroidRuntime(10804): at android.app.Activity.performCreate(Activity.java:5231)
04-08 13:56:25.829: E/AndroidRuntime(10804): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
04-08 13:56:25.829: E/AndroidRuntime(10804): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
04-08 13:56:25.829: E/AndroidRuntime(10804): ... 11 more
我输入了 Manifest 互联网许可。我该如何解决这个错误？
【问题讨论】：
-
你确定 ActiveMQ 上的 Stomp 端口配置为 8161
-
非常感谢！！这是我的错误...
-
FWIW，NetworkOnMainThreadException 是由于您尝试在主线程中连接到网络的原因，最近的 android 版本不支持。您可能希望异步执行此操作。
标签： java android activemq stomp