我尝试了很多没有使用的所有库，并按照文档使其工作任何帮助将不胜感激 这是我的logcat中出现的内容：
05-18 17:26:50.480: E/dalvikvm(5818): Could not find class 'com.google.maps.android.utils.demo.ClusteringDemoActivity', referenced from method com.google.maps.android.utils.demo.MainActivity.onCreate
05-18 17:26:50.552: E/AndroidRuntime(5818): FATAL EXCEPTION: main
05-18 17:26:50.552: E/AndroidRuntime(5818): java.lang.NoClassDefFoundError: com.google.maps.android.utils.demo.ClusteringDemoActivity
05-18 17:26:50.552: E/AndroidRuntime(5818): at com.google.maps.android.utils.demo.MainActivity.onCreate(MainActivity.java:22)
05-18 17:26:50.552: E/AndroidRuntime(5818): at android.app.Activity.performCreate(Activity.java:5133)
05-18 17:26:50.552: E/AndroidRuntime(5818): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
05-18 17:26:50.552: E/AndroidRuntime(5818): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
05-18 17:26:50.552: E/AndroidRuntime(5818): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
05-18 17:26:50.552: E/AndroidRuntime(5818): at android.app.ActivityThread.access$600(ActivityThread.java:141)
05-18 17:26:50.552: E/AndroidRuntime(5818): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
05-18 17:26:50.552: E/AndroidRuntime(5818): at android.os.Handler.dispatchMessage(Handler.java:99)
05-18 17:26:50.552: E/AndroidRuntime(5818): at android.os.Looper.loop(Looper.java:137)
05-18 17:26:50.552: E/AndroidRuntime(5818): at android.app.ActivityThread.main(ActivityThread.java:5103)
05-18 17:26:50.552: E/AndroidRuntime(5818): at java.lang.reflect.Method.invokeNative(Native Method)
05-18 17:26:50.552: E/AndroidRuntime(5818): at java.lang.reflect.Method.invoke(Method.java:525)
05-18 17:26:50.552: E/AndroidRuntime(5818): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
05-18 17:26:50.552: E/AndroidRuntime(5818): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
05-18 17:26:50.552: E/AndroidRuntime(5818): at dalvik.system.NativeStart.main(Native Method)