Android Development Error: The type android.support.v4.app.taskstackbuilder$supportparentable cannot be resolved.

Today in the use of the lower version of Actionbar, in succession to the actionbaractivity times "the type android.support.v4.app.taskstackbuilder$supportparentable cannot be resolved. It was indirectly referenced from required. class files "error, the online search for a long time finally solved.

The source of the problem: since the Android-support-v4.jar package under Eclipse was copied to the ' Android-support-v7-appcompat ' library project when the jar package for the project was copied, Replaced the original Android-support-v4.jar, and Eclipse comes with a lower version, resulting in an error.

Solution: Of course, replace the Android-support-v4.jar. \sdk\extras\android\support\v7\appcompat\libs under the Android-support-v4.jar.

PS: A moment of negligence, resulting in a lot of time in the search to solve the problem of error, in this record.

Android Development Error: The type android.support.v4.app.taskstackbuilder$supportparentable cannot be resolved.