[Panlingual] Add outside entry.

- video: https://screencast.googleplex.com/cast/NjIxODkzNzYyMjU5MzUzNnwwMWMxYjI1Ny1hMw

Bug: 207743479
Test: local
Change-Id: Iab3ba4d14f581aed7b737521ccba4f62e1c04998

src/com/android/settings/applications/appinfo/AppLocalePickerActivity.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.settings.applications.appinfo;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.util.Log;
+
+import androidx.annotation.VisibleForTesting;
+
+import com.android.settings.SettingsActivity;
+import com.android.settings.applications.AppInfoBase;
+
+/** Activity for the entry of {@link #AppLocaleDetails} from outside Settings app. */
+public class AppLocalePickerActivity extends SettingsActivity {
+    private static final String TAG = "AppLocalePickerActivity";
+
+    @Override
+    protected void onCreate(Bundle savedState) {
+        Intent intent = getEntryIntent(getIntent());
+        if (intent == null) {
+            finish();
+            return;
+        }
+        setIntent(intent);
+        super.onCreate(savedState);
+    }
+
+    @VisibleForTesting
+    Intent getEntryIntent(Intent intent) {
+        String callingPackage = getCallingPackage();
+        if (callingPackage == null || callingPackage.isEmpty()) {
+            Log.d(TAG, "No calling package name is found.");
+            return null;
+        }
+        final Bundle fragmentArgs = new Bundle();
+        fragmentArgs.putString(AppInfoBase.ARG_PACKAGE_NAME, callingPackage);
+        return intent.putExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT_ARGUMENTS, fragmentArgs);
+    }
+}