找不到android.support.v4.view.ViewPager
網上找了3種解決的方法：
1、我是通過項目 -> 屬性 -> Java Build Path -> Add External JARs添加了android-support-v4.jar包的，解決只需要項目 -> 屬性 -> Java Build Path -> Remove該jar，直接將jar包復制到項目的libs目錄下即可。因為項目libs下的jar包會自動導入項目，不需要手動導入。 http://www.cnblogs.com/trinea/archive/2012/11/16/2771062.html
2、SDK升級后，V4包會找不到報錯，右鍵libs包設置 build path 選use as source folder,再把 jar包 add to build path,就ok了 http://blog.csdn.net/zengzhongxiang/article/details/7920711
3、在項目的properties中的Java Build Path里將Order and Export里的android-support-v4.jar勾選上。 http://www.apkbus.com/android-73371-1-1.html
------------------------------
錯誤： 04-19 12:01:20.883: E/AndroidRuntime(871): Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.v4.view.ViewPager" on path: /data/app/********.apk 04-19 12:01:20.883: E/AndroidRuntime(871): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:65) 04-19 12:01:20.883: E/AndroidRuntime(871): at java.lang.ClassLoader.loadClass(ClassLoader.java:501) 04-19 12:01:20.883: E/AndroidRuntime(871): at java.lang.ClassLoader.loadClass(ClassLoader.java:461) 04-19 12:01:20.883: E/AndroidRuntime(871): at android.view.LayoutInflater.createView(LayoutInflater.java:552) 04-19 12:01:20.883: E/AndroidRuntime(871): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:687) 04-19 12:01:20.883: E/AndroidRuntime(871): ... 20 more
轉載自:http://blog.csdn.net/nj_liuzl/article/details/8825855#comments