import android.preference.PreferenceFragment;
import android.preference.PreferenceManager;
import android.preference.RingtonePreference;
-import android.support.v4.app.NavUtils;
-import android.support.v7.app.ActionBar;
+import androidx.core.app.NavUtils;
+import androidx.appcompat.app.ActionBar;
import android.text.TextUtils;
import android.view.MenuItem;