java.lang.NoClassDefFoundError: com.weibo.net.Weibo错误

在开发微博客户端过程中，不可避免地会查看其它不相关的工程，当运行或者编辑其它不相关的工程的时候，eclipse会缓存下很多干扰信息，因此导致运行微博客户端时，出现如下错误：

01-14 16:04:54.746: E/dalvikvm(7550): Could not find class 'com.weibo.net.WeiboParameters', referenced from method com.logan.weibo.BaseActivity.update
01-14 16:04:54.746: E/AndroidRuntime(7550): FATAL EXCEPTION: main
01-14 16:04:54.746: E/AndroidRuntime(7550): java.lang.NoClassDefFoundError: com.weibo.net.Weibo
01-14 16:04:54.746: E/AndroidRuntime(7550): 	at com.logan.weibo.BaseActivity.<init>(BaseActivity.java:55)
01-14 16:04:54.746: E/AndroidRuntime(7550): 	at com.logan.authorize.WelcomeActivity.<init>(WelcomeActivity.java:19)
01-14 16:04:54.746: E/AndroidRuntime(7550): 	at java.lang.Class.newInstanceImpl(Native Method)
01-14 16:04:54.746: E/AndroidRuntime(7550): 	at java.lang.Class.newInstance(Class.java:1409)
01-14 16:04:54.746: E/AndroidRuntime(7550): 	at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
01-14 16:04:54.746: E/AndroidRuntime(7550): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1610)
01-14 16:04:54.746: E/AndroidRuntime(7550): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1716)
01-14 16:04:54.746: E/AndroidRuntime(7550): 	at android.app.ActivityThread.access$1500(ActivityThread.java:124)
01-14 16:04:54.746: E/AndroidRuntime(7550): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:968)
01-14 16:04:54.746: E/AndroidRuntime(7550): 	at android.os.Handler.dispatchMessage(Handler.java:99)
01-14 16:04:54.746: E/AndroidRuntime(7550): 	at android.os.Looper.loop(Looper.java:130)
01-14 16:04:54.746: E/AndroidRuntime(7550): 	at android.app.ActivityThread.main(ActivityThread.java:3806)
01-14 16:04:54.746: E/AndroidRuntime(7550): 	at java.lang.reflect.Method.invokeNative(Native Method)
01-14 16:04:54.746: E/AndroidRuntime(7550): 	at java.lang.reflect.Method.invoke(Method.java:507)
01-14 16:04:54.746: E/AndroidRuntime(7550): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
01-14 16:04:54.746: E/AndroidRuntime(7550): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
01-14 16:04:54.746: E/AndroidRuntime(7550): 	at dalvik.system.NativeStart.main(Native Method)

解决办法是：

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