Android中非常简单的XMPP客户端答案

【问题标题】：Very Simple XMPP client in AndroidAndroid中非常简单的XMPP客户端
【发布时间】：2016-01-09 20:33:02
【问题描述】：

我正在尝试使用 XMPP 服务器创建一个基本的消息传递基础架构，并且已经成功地使用 Python 非常优雅地做到了这一点。在 Python 上成功发送和接收小型预定义消息。现在下一个任务是从 Android 手机发送类似的消息。请注意，我真的不需要 Xabber 样式客户端提供的完整聊天客户端功能。

我是 Android 新手，并没有真正研究过 Java、Eclipse。尽管如此，我还是在 Android 中使用了一个基本的“Hello World”程序（空白活动模板），并使用来自igniterealtime 网站的一些基本 XMPP 代码进行了“增强”。所以 MainActivity.java 程序看起来像这样：

package com.yantrajaal.pm1324;

import java.io.IOException;

import org.jivesoftware.smack.AbstractXMPPConnection;
import org.jivesoftware.smack.SmackException;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.tcp.XMPPTCPConnection;
import org.jivesoftware.smack.tcp.XMPPTCPConnectionConfiguration;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
         XMPPTCPConnectionConfiguration.Builder configBuilder = XMPPTCPConnectionConfiguration.builder();
           configBuilder.setUsernameAndPassword("userid", "xxxxxx");
           //configBuilder.setResource("SomeResource");
           configBuilder.setServiceName("adastra.re");

           AbstractXMPPConnection connection = new XMPPTCPConnection(configBuilder.build());
           // Connect to the server
           try {
            connection.connect();
        } catch (SmackException | IOException | XMPPException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
           // Log into the server
           try {
                connection.login();
            } catch (SmackException | IOException | XMPPException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

我包含的 smack 库是

/home/hduser/workspace/PM1324/libs/smack-tcp-4.1.4.jar
/home/hduser/workspace/PM1324/libs/smack-android-4.1.4.jar
/home/hduser/workspace/PM1324/libs/android-support-v4.jar
/home/hduser/workspace/PM1324/libs/smack-core-4.1.4.jar

加

/home/hduser/eclipse-android-sdks/platforms/android-23/android.jar

包含这些库并导入各种类后，程序中没有编译时错误:-)

但是，当我在模拟器中执行程序时，程序会在启动时立即崩溃（停止工作）。甚至“Hello World”字符串也没有出现。

日志的相关部分显示如下：

10-12 16:41:42.860: E/AndroidRuntime(893): FATAL EXCEPTION: main
10-12 16:41:42.860: E/AndroidRuntime(893): Process: com.yantrajaal.pm1324, PID: 893
10-12 16:41:42.860: E/AndroidRuntime(893): java.lang.NoClassDefFoundError: org.jxmpp.util.XmppStringUtils
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.provider.ProviderManager.getKey(ProviderManager.java:314)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.provider.ProviderManager.addStreamFeatureProvider(ProviderManager.java:304)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.provider.ProviderManager.addLoader(ProviderManager.java:140)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.initializer.UrlInitializer.initialize(UrlInitializer.java:54)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.SmackInitialization.loadSmackClass(SmackInitialization.java:232)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.SmackInitialization.parseClassesToLoad(SmackInitialization.java:193)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.SmackInitialization.processConfigFile(SmackInitialization.java:163)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.SmackInitialization.processConfigFile(SmackInitialization.java:148)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.SmackInitialization.<clinit>(SmackInitialization.java:116)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.SmackConfiguration.getVersion(SmackConfiguration.java:96)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.ConnectionConfiguration.<clinit>(ConnectionConfiguration.java:38)
10-12 16:41:42.860: E/AndroidRuntime(893):  at com.yantrajaal.pm1324.MainActivity.onCreate(MainActivity.java:22)
10-12 16:41:42.860: E/AndroidRuntime(893):  at android.app.Activity.performCreate(Activity.java:5231)
10-12 16:41:42.860: E/AndroidRuntime(893):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
10-12 16:41:42.860: E/AndroidRuntime(893):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
10-12 16:41:42.860: E/AndroidRuntime(893):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
10-12 16:41:42.860: E/AndroidRuntime(893):  at android.app.ActivityThread.access$800(ActivityThread.java:135)
10-12 16:41:42.860: E/AndroidRuntime(893):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
10-12 16:41:42.860: E/AndroidRuntime(893):  at android.os.Handler.dispatchMessage(Handler.java:102)
10-12 16:41:42.860: E/AndroidRuntime(893):  at android.os.Looper.loop(Looper.java:136)
10-12 16:41:42.860: E/AndroidRuntime(893):  at android.app.ActivityThread.main(ActivityThread.java:5001)
10-12 16:41:42.860: E/AndroidRuntime(893):  at java.lang.reflect.Method.invokeNative(Native Method)
10-12 16:41:42.860: E/AndroidRuntime(893):  at java.lang.reflect.Method.invoke(Method.java:515)
10-12 16:41:42.860: E/AndroidRuntime(893):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
10-12 16:41:42.860: E/AndroidRuntime(893):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
10-12 16:41:42.860: E/AndroidRuntime(893):  at dalvik.system.NativeStart.main(Native Method)

如果有人能指导我做错了什么以及如何解决问题，我将不胜感激。

提前感谢您提供的任何建议和指导。

新问题/问题

已经解决了 FATAL EXCEPTION 和 NoClassDefFoundError [参见下面的第二个答案]，但现在我遇到了 XMPP 调用的另一个问题。 [我不想就同一个问题创建另一个问题，所以我在这里继续]

现在程序执行，没有中止但无法连接到 XMPP 服务器，并且日志显示以下警告。

10-13 08:48:44.065: W/System.err(1049): org.jivesoftware.smack.SmackException$ConnectionException: The following addresses failed: 'adastra.re:5222' failed because android.os.NetworkOnMainThreadException
10-13 08:48:44.085: W/System.err(1049):     at org.jivesoftware.smack.tcp.XMPPTCPConnection.connectUsingConfiguration(XMPPTCPConnection.java:596)
10-13 08:48:44.085: W/System.err(1049):     at org.jivesoftware.smack.tcp.XMPPTCPConnection.connectInternal(XMPPTCPConnection.java:830)
10-13 08:48:44.085: W/System.err(1049):     at org.jivesoftware.smack.AbstractXMPPConnection.connect(AbstractXMPPConnection.java:360)
10-13 08:48:44.095: W/System.err(1049):     at com.example.pm707.MainActivity.onCreate(MainActivity.java:32)
10-13 08:48:44.095: W/System.err(1049):     at android.app.Activity.performCreate(Activity.java:5231)
10-13 08:48:44.095: W/System.err(1049):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
10-13 08:48:44.095: W/System.err(1049):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
10-13 08:48:44.095: W/System.err(1049):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
10-13 08:48:44.095: W/System.err(1049):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
10-13 08:48:44.095: W/System.err(1049):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
10-13 08:48:44.095: W/System.err(1049):     at android.os.Handler.dispatchMessage(Handler.java:102)
10-13 08:48:44.095: W/System.err(1049):     at android.os.Looper.loop(Looper.java:136)
10-13 08:48:44.095: W/System.err(1049):     at android.app.ActivityThread.main(ActivityThread.java:5001)
10-13 08:48:44.095: W/System.err(1049):     at java.lang.reflect.Method.invokeNative(Native Method)
10-13 08:48:44.095: W/System.err(1049):     at java.lang.reflect.Method.invoke(Method.java:515)
10-13 08:48:44.095: W/System.err(1049):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
10-13 08:48:44.095: W/System.err(1049):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
10-13 08:48:44.095: W/System.err(1049):     at dalvik.system.NativeStart.main(Native Method)
10-13 08:48:44.095: W/System.err(1049): org.jivesoftware.smack.SmackException$NotConnectedException: Client is not, or no longer, connected
10-13 08:48:44.155: W/System.err(1049):     at org.jivesoftware.smack.tcp.XMPPTCPConnection.throwNotConnectedExceptionIfAppropriate(XMPPTCPConnection.java:334)
10-13 08:48:44.155: W/System.err(1049):     at org.jivesoftware.smack.AbstractXMPPConnection.login(AbstractXMPPConnection.java:447)
10-13 08:48:44.165: W/System.err(1049):     at org.jivesoftware.smack.AbstractXMPPConnection.login(AbstractXMPPConnection.java:410)
10-13 08:48:44.165: W/System.err(1049):     at com.example.pm707.MainActivity.onCreate(MainActivity.java:39)
10-13 08:48:44.165: W/System.err(1049):     at android.app.Activity.performCreate(Activity.java:5231)
10-13 08:48:44.165: W/System.err(1049):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
10-13 08:48:44.165: W/System.err(1049):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
10-13 08:48:44.165: W/System.err(1049):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
10-13 08:48:44.175: W/System.err(1049):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
10-13 08:48:44.175: W/System.err(1049):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
10-13 08:48:44.185: W/System.err(1049):     at android.os.Handler.dispatchMessage(Handler.java:102)
10-13 08:48:44.185: W/System.err(1049):     at android.os.Looper.loop(Looper.java:136)
10-13 08:48:44.185: W/System.err(1049):     at android.app.ActivityThread.main(ActivityThread.java:5001)
10-13 08:48:44.185: W/System.err(1049):     at java.lang.reflect.Method.invokeNative(Native Method)
10-13 08:48:44.185: W/System.err(1049):     at java.lang.reflect.Method.invoke(Method.java:515)
10-13 08:48:44.185: W/System.err(1049):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
10-13 08:48:44.185: W/System.err(1049):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
10-13 08:48:44.185: W/System.err(1049):     at dalvik.system.NativeStart.main(Native Method)
10-13 08:48:44.355: D/(1049): HostConnection::get() New Host Connection established 0xb8104c50, tid 1049
10-13 08:48:44.415: W/EGL_emulation(1049): eglSurfaceAttrib not implemented

如果您有任何解决此问题的想法，我们将不胜感激

【问题讨论】：

这有帮助吗？ http://stackoverflow.com/a/30568982/4791726

标签： android xmpp

【解决方案1】：

Smack jar 应该在 runtime 中可供应用程序使用，但 android.jar - 已经存在于每个 android 设备上，并且应该只能在 compile time 中由编译器访问。 NoClassDefFoundError 表示应用找不到 smack 库，因为它们不包含在您的目标 apk 中，因此问题出在您的构建配置中。

【讨论】：

【解决方案2】：

问题已解决如下。所有 smack jars 都从所有库中物理移除。然后我在How to use Smack 4.1 on Android 上查看了这个先前的答案这将我带到Smack Readme and Upgrade Guide。我下载了 python3 文件，按照说明创建了 artifact.csv 文件并运行了 python3 脚本。这在我的项目文件夹中安装了所有 smack 4.1 的东西。

由于其他错误，程序仍然无法运行，但是NoClassDefFound的这个问题已经解决了。

【讨论】：

第二个问题已通过使用 AsyncTask 解决...因为 Android 不允许从主线程进行网络操作