Android 错误 Dx trouble writing output :already prepared

Question

我正在使用 Smack 构建应用程序。在 Eclipse 模拟器中运行应用程序后，apk 已成功安装，但似乎没有响应。单击它后，我得到了 警告“不幸的是，该应用程序停止工作”。请帮我解决同样的问题。 日志:

01-13 05:55:17.117: E/AndroidRuntime(1067): FATAL EXCEPTION: main
01-13 05:55:17.117: E/AndroidRuntime(1067): Process: com.demo.xmppchat, PID: 1067
01-13 05:55:17.117: E/AndroidRuntime(1067): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.demo.xmppchat/com.demo.xmppchat.CustomizedListView}: java.lang.NullPointerException
01-13 05:55:17.117: E/AndroidRuntime(1067):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2176)
01-13 05:55:17.117: E/AndroidRuntime(1067):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2226)
01-13 05:55:17.117: E/AndroidRuntime(1067):     at android.app.ActivityThread.access$700(ActivityThread.java:135)
01-13 05:55:17.117: E/AndroidRuntime(1067):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
01-13 05:55:17.117: E/AndroidRuntime(1067):     at android.os.Handler.dispatchMessage(Handler.java:102)
01-13 05:55:17.117: E/AndroidRuntime(1067):     at android.os.Looper.loop(Looper.java:137)
01-13 05:55:17.117: E/AndroidRuntime(1067):     at android.app.ActivityThread.main(ActivityThread.java:4998)
01-13 05:55:17.117: E/AndroidRuntime(1067):     at java.lang.reflect.Method.invokeNative(Native Method)
01-13 05:55:17.117: E/AndroidRuntime(1067):     at java.lang.reflect.Method.invoke(Method.java:515)
01-13 05:55:17.117: E/AndroidRuntime(1067):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
01-13 05:55:17.117: E/AndroidRuntime(1067):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
01-13 05:55:17.117: E/AndroidRuntime(1067):     at dalvik.system.NativeStart.main(Native Method)
01-13 05:55:17.117: E/AndroidRuntime(1067): Caused by: java.lang.NullPointerException
01-13 05:55:17.117: E/AndroidRuntime(1067):     at com.demo.xmppchat.CustomizedListView.onCreate(CustomizedListView.java:80)
01-13 05:55:17.117: E/AndroidRuntime(1067):     at android.app.Activity.performCreate(Activity.java:5243)
01-13 05:55:17.117: E/AndroidRuntime(1067):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
01-13 05:55:17.117: E/AndroidRuntime(1067):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2140)
01-13 05:55:17.117: E/AndroidRuntime(1067):     ... 11 more

Answer 1

打开项目的属性 -> Java 构建路径 -> 取消选中“Android Private Libraries”和“Android Dependencies”。