Use preview_sdk_int for version code checks

Don't use Build.VERSION.CODENAME to check for R.
Use Build.VERSION.SDK_INT > Q || (Build.VERSION.SDK_INT == Q &&
        Build.VERSION.PREVIEW_SDK_INT > 0)

Bug: 146235828
Test: m DocumentsUIGoogle

Change-Id: I59e327d4e92d41a93b6bea145b8497fd4f85108c
1 file changed