It can be solved by Add Support Library in Eclipse menu.
- New a Android project target Android 3.0 (API Level 11).
- Modify AndroidManifest.xml to specify minSdkVersion and targetSdkVersion:
<uses-sdk android:minSdkVersion="7" android:targetSdkVersion="11"/>
- Add Android Support Library.
Right click on the project in Eclipse, select Android Tools, Add Support Library...
Accept to install Android Support.
- Test it
Modify your activity extends FragmentActivity instead Activity, and import android.support.v4.app.FragmentActivity.
Now you can run it without error.
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