[Settings] Do not use deprecated API, onBackPressed

Bug: 318313238
Test: manual
Change-Id: I616ea3cf4b2b89905d85380305df4853d4d5d626

src/com/android/settings/localepicker/LocalePickerWithRegionActivity.java

@@ -16,6 +16,8 @@
 
 package com.android.settings.localepicker;
 
+import static android.window.OnBackInvokedDispatcher.PRIORITY_DEFAULT;
+
 import android.app.FragmentTransaction;
 import android.content.Intent;
 import android.os.Bundle;
@@ -23,6 +25,7 @@ import android.os.LocaleList;
 import android.provider.Settings;
 import android.util.Log;
 import android.view.MenuItem;
+import android.window.OnBackInvokedCallback;
 
 import androidx.core.view.ViewCompat;
 
@@ -39,6 +42,10 @@ public class LocalePickerWithRegionActivity extends SettingsBaseActivity
 
     private LocalePickerWithRegion mSelector;
 
+    private final OnBackInvokedCallback mOnBackInvokedCallback = () -> {
+        handleBackPressed();
+    };
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -52,7 +59,8 @@ public class LocalePickerWithRegionActivity extends SettingsBaseActivity
                     : bundle.getParcelable(Settings.EXTRA_EXPLICIT_LOCALES, LocaleList.class);
             Log.i(TAG, "Has explicit locales : " + explicitLocales);
         }
-
+        getOnBackInvokedDispatcher()
+                .registerOnBackInvokedCallback(PRIORITY_DEFAULT, mOnBackInvokedCallback);
         mSelector = LocalePickerWithRegion.createLanguagePicker(
                 this,
                 LocalePickerWithRegionActivity.this,
@@ -68,6 +76,12 @@ public class LocalePickerWithRegionActivity extends SettingsBaseActivity
                 .commit();
     }
 
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        getOnBackInvokedDispatcher().unregisterOnBackInvokedCallback(mOnBackInvokedCallback);
+    }
+
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         if (item.getItemId() == android.R.id.home) {
@@ -85,11 +99,6 @@ public class LocalePickerWithRegionActivity extends SettingsBaseActivity
         finish();
     }
 
-    @Override
-    public void onBackPressed() {
-        handleBackPressed();
-    }
-
     private void handleBackPressed() {
         if (getFragmentManager().getBackStackEntryCount() > 1) {
             super.onBackPressed();