Question

今天。我正在使用xmpp Api smack开发一个android应用程序，我想在openfire服务器上获取聊天室，但是当我调用以下函数时：

Collection<HostedRoom> rooms = MultiUserChat.getHostedRooms(ClientConServer.connection,"conference." + ClientConServer.connection.getServiceName(））;

我收到以下错误：

08-12 15:53:50.754: E/AndroidRuntime(2897): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.multichat/com.example.multichat.QuestionsList}: java.lang.NullPointerException
08-12 15:53:50.754: E/AndroidRuntime(2897):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
08-12 15:53:50.754: E/AndroidRuntime(2897):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
08-12 15:53:50.754: E/AndroidRuntime(2897):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
08-12 15:53:50.754: E/AndroidRuntime(2897):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
08-12 15:53:50.754: E/AndroidRuntime(2897):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-12 15:53:50.754: E/AndroidRuntime(2897):     at android.os.Looper.loop(Looper.java:137)
08-12 15:53:50.754: E/AndroidRuntime(2897):     at android.app.ActivityThread.main(ActivityThread.java:5103)
08-12 15:53:50.754: E/AndroidRuntime(2897):     at java.lang.reflect.Method.invokeNative(Native Method)
08-12 15:53:50.754: E/AndroidRuntime(2897):     at java.lang.reflect.Method.invoke(Method.java:525)
08-12 15:53:50.754: E/AndroidRuntime(2897):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
08-12 15:53:50.754: E/AndroidRuntime(2897):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-12 15:53:50.754: E/AndroidRuntime(2897):     at dalvik.system.NativeStart.main(Native Method)
08-12 15:53:50.754: E/AndroidRuntime(2897): Caused by: java.lang.NullPointerException
08-12 15:53:50.754: E/AndroidRuntime(2897):     at org.jivesoftware.smackx.muc.MultiUserChat.getHostedRooms(MultiUserChat.java:288)
08-12 15:53:50.754: E/AndroidRuntime(2897):     at com.example.multichat.QuestionsList.onCreate(QuestionsList.java:78)
08-12 15:53:50.754: E/AndroidRuntime(2897):     at android.app.Activity.performCreate(Activity.java:5133)
08-12 15:53:50.754: E/AndroidRuntime(2897):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
08-12 15:53:50.754: E/AndroidRuntime(2897):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
08-12 15:53:50.754: E/AndroidRuntime(2897):     ... 11 more

我尽力在谷歌搜索这个问题，有人提出这样的建议： enter link description here

但他们的方法对我不起作用？我需要你的帮助！

Answer 1

将<activity android:name=".QuestionsList"/>放入AndroidManifest.xml（修改以适应您的活动所在地）

Answer 2

这可能是一个初始化问题。

java Smack在启动时读取META-INF / smack-config.xml并加载其中列出的类（从而在这些类中执行静态块）。 Android asmack需要一些解决方法才能获得正确的初始化。

另见Cannot get list of public rooms from xmpp Server on Android?

Android时我调用MultiUserChat.getHostedRoom：null指针异常

2 个答案: