Question

我跟随this tutorial＆amp;试图获得sample code＆＃34; gplus-quickstart-android＆＃34;工作。我没有错误地构建项目。但是，当我尝试在我的设备上运行应用程序（用usb连接到我的笔记本电脑）时，应用程序会立即崩溃。
我看到了这个错误java.lang.ClassNotFoundException:com.google.android.gms.plus.sample.quickstart.MainActivity

这是日志记录：

07-21 10:49:10.699: E/Trace(22334): error opening trace file: No such file or directory (2)
07-21 10:49:10.779: W/dalvikvm(22334): threadid=1: thread exiting with uncaught exception (group=0x4100e450)
07-21 10:49:10.809: E/AndroidRuntime(22334): FATAL EXCEPTION: main
07-21 10:49:10.809: E/AndroidRuntime(22334): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.google.android.gms.plus.sample.quickstart/com.google.android.gms.plus.sample.quickstart.MainActivity}: java.lang.ClassNotFoundException: com.google.android.gms.plus.sample.quickstart.MainActivity
07-21 10:49:10.809: E/AndroidRuntime(22334):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1991)
07-21 10:49:10.809: E/AndroidRuntime(22334):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2092)
07-21 10:49:10.809: E/AndroidRuntime(22334):    at android.app.ActivityThread.access$600(ActivityThread.java:133)
07-21 10:49:10.809: E/AndroidRuntime(22334):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1203)
07-21 10:49:10.809: E/AndroidRuntime(22334):    at android.os.Handler.dispatchMessage(Handler.java:99)
07-21 10:49:10.809: E/AndroidRuntime(22334):    at android.os.Looper.loop(Looper.java:137)
07-21 10:49:10.809: E/AndroidRuntime(22334):    at android.app.ActivityThread.main(ActivityThread.java:4794)
07-21 10:49:10.809: E/AndroidRuntime(22334):    at java.lang.reflect.Method.invokeNative(Native Method)
07-21 10:49:10.809: E/AndroidRuntime(22334):    at java.lang.reflect.Method.invoke(Method.java:511)
07-21 10:49:10.809: E/AndroidRuntime(22334):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
07-21 10:49:10.809: E/AndroidRuntime(22334):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
07-21 10:49:10.809: E/AndroidRuntime(22334):    at dalvik.system.NativeStart.main(Native Method)
07-21 10:49:10.809: E/AndroidRuntime(22334): Caused by: java.lang.ClassNotFoundException: com.google.android.gms.plus.sample.quickstart.MainActivity
07-21 10:49:10.809: E/AndroidRuntime(22334):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
07-21 10:49:10.809: E/AndroidRuntime(22334):    at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
07-21 10:49:10.809: E/AndroidRuntime(22334):    at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
07-21 10:49:10.809: E/AndroidRuntime(22334):    at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
07-21 10:49:10.809: E/AndroidRuntime(22334):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1982)
07-21 10:49:10.809: E/AndroidRuntime(22334):    ... 11 more

是否有人提示如何解决这个问题或者我可能做错了什么？

Answer 1

导入项目后MainActivity.java不在src文件夹中，它位于java文件夹中。

所以，我在包含名称MainActivity.java＆amp;的src文件夹中创建了com.google.android.gms.plus.sample.quickstart复制了MainActivity.java

中的代码

MainActivity使用FragmentActivity因此，我在项目中添加了android-support-v4.jar。

然后运行项目！

Google+快速入门示例应用崩溃

1 个答案: