- In Eclipse Select Project > Properties, select Java Build Path, and navigate to Libraries.
- Select Add External Jars, include the following jar files, and click OK: <android-sdk-folder>/extras/android/compatibility/v4/android-support-v4.jar
But...I found that it is not always work, even always NOT work!
No error when you compile your code, but fail with error "Caused by: java.lang.NoClassDefFoundError: youractivity" at runtime.
My alternatively, Right click your project, select Android Tools > Add Support Library...
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Here is another solution advised by Stefan de Bruijn in comments:
- create a folder called "libs", NOT "lib".
- copy the required jar in "libs" folder.
- Update Java Build Path by selecting "Add JARs..." (NOT "Add External JARs...") to add the jar in libs.
- like this: java.lang.NoClassDefFoundError: com.google.ads.AdView.
