Replace alert dialog with material alert dialog

app/src/main/java/com/hippo/preference/DialogPreference.java

@@ -37,6 +37,7 @@ import androidx.appcompat.app.AlertDialog;
 import androidx.core.content.ContextCompat;
 import androidx.preference.Preference;
 
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
 import com.hippo.ehviewer.R;
 
 /**
@@ -254,7 +255,7 @@ public abstract class DialogPreference extends Preference implements
 
         mWhichButtonClicked = DialogInterface.BUTTON_NEGATIVE;
 
-        mBuilder = new AlertDialog.Builder(context)
+        mBuilder = new MaterialAlertDialogBuilder(context)
                 .setTitle(mDialogTitle)
                 .setIcon(mDialogIcon)
                 .setPositiveButton(mPositiveButtonText, this)