Manifest merger failed : Attribute meta-data#android.support.VERSION@value value=(25.3.0) from [com.android.support:appcompat-v7:25.3.0] AndroidManifest.xml:27:9-31
I was having the same issue after adding the RecyclerView library which was coming in as version 26.0.0-alpha1.
I noticed my Appcompat library was at version 25.3.1
So I was able to fix the error by updating the AppCompat library to match the RecyclerView version.
Goto Project Structure->app->Dependencies and remove any older AppCompat libraries then click add and search for com.android.support:appcompat-v7 and you should see a newer version that matches the RecyclerView library.
原因：appcompat-v7 版本过低，不兼容recyclerview 库，重新引入同版本库即可。