The Android Support Library v4 makes it possible to provide new functions (like Fragments, DrawerLayout etc.) on old Android versions. However, when integrating Android library projects, a „jar dismatch“ occurs again and again. This is caused by different versions of the support library, because the support library is constantly being developed, just like Android itself. Unfortunately, the „android-support-v4.jar“ itself cannot be used to determine which version it is. I have therefore listed all versions and their MD5 and SHA1 hash values in the following table.