我遇到问题，运行谷歌地图Android的API工具演示，它显示了这个错误：

i'm having problems to run the Google Maps Android API Utility Demo, it shows this error:

04-03 16:32:37.397: E/dalvikvm(2592): Could not find class 'com.google.maps.android.utils.demo.ClusteringDemoActivity', referenced from method com.google.maps.android.utils.demo.MainActivity.onCreate
    04-03 16:32:37.452: E/AndroidRuntime(2592): FATAL EXCEPTION: main
    04-03 16:32:37.452: E/AndroidRuntime(2592): java.lang.NoClassDefFoundError: com.google.maps.android.utils.demo.ClusteringDemoActivity
    04-03 16:32:37.452: E/AndroidRuntime(2592):     at com.google.maps.android.utils.demo.MainActivity.onCreate(MainActivity.java:20)
    04-03 16:32:37.452: E/AndroidRuntime(2592):     at android.app.Activity.performCreate(Activity.java:5163)
    04-03 16:32:37.452: E/AndroidRuntime(2592):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
    04-03 16:32:37.452: E/AndroidRuntime(2592):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2061)
    04-03 16:32:37.452: E/AndroidRuntime(2592):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2122)
    04-03 16:32:37.452: E/AndroidRuntime(2592):     at android.app.ActivityThread.access$600(ActivityThread.java:140)
    04-03 16:32:37.452: E/AndroidRuntime(2592):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1228)
    04-03 16:32:37.452: E/AndroidRuntime(2592):     at android.os.Handler.dispatchMessage(Handler.java:99)
    04-03 16:32:37.452: E/AndroidRuntime(2592):     at android.os.Looper.loop(Looper.java:137)
    04-03 16:32:37.452: E/AndroidRuntime(2592):     at android.app.ActivityThread.main(ActivityThread.java:4895)
    04-03 16:32:37.452: E/AndroidRuntime(2592):     at java.lang.reflect.Method.invokeNative(Native Method)
    04-03 16:32:37.452: E/AndroidRuntime(2592):     at java.lang.reflect.Method.invoke(Method.java:511)
    04-03 16:32:37.452: E/AndroidRuntime(2592):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:994)
    04-03 16:32:37.452: E/AndroidRuntime(2592):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:761)
    04-03 16:32:37.452: E/AndroidRuntime(2592):     at dalvik.system.NativeStart.main(Native Method)

虽然我也跟着在安装演示所示的步骤，类 ClusteringDemoActivity 存在于包中。

推荐答案

我加入GoogleMapsUtil作为库示范项目解决了这一点。

I solved this by adding the GoogleMapsUtil as a library to the demo project.

如果您遵循的安装指南，在https://developers.google.com/maps/documentation/android/utility/setup在上述步骤的从程序演示程序引用的实用程序库的执行以下操作来代替：

If you are following the setup guide at https://developers.google.com/maps/documentation/android/utility/setup at the step Reference the utility library from the utility demo app do the following instead: