Support DISALLOW_CONFIG_LOCALE user restriction

Bug: 67586452
Test: make ROBOTEST_FILTER="(LocaleListEditorTest)" RunSettingsRoboTests\
&& make cts && cts-tradefed run cts-dev -m DevicePolicyManager \
-t com.android.cts.devicepolicy.UserRestrictionsTest

Change-Id: I2260b106a111078a62ae7628d6f60e976b70069c

res/values/strings.xml

@@ -4057,6 +4057,8 @@
 
     <!-- Title of setting on main settings screen.  This item will take the user to the screen to tweak settings realted to locale and text -->
     <string name="language_settings">Languages&#160;&amp; input</string>
+    <!-- Text displayed when user has restriction DISALLOW_CONFIG_LOCALE [CHAR LIMIT=NONE]-->
+    <string name="language_empty_list_user_restricted">You don\u2019t have permission to change the device language.</string>
     <!-- Title of Languages & input settings screen -->
     <string name="language_keyboard_settings_title">Languages&#160;&amp; input</string>
     <!-- Title of preference category that lists all settings about helping user text input such as spell checker [CHAR LIMIT=60]-->

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

@@ -82,14 +82,13 @@ class LocaleDragAndDropAdapter
     }
 
     public LocaleDragAndDropAdapter(Context context, List<LocaleStore.LocaleInfo> feedItemList) {
-        this.mFeedItemList = feedItemList;
-
-        this.mContext = context;
+        mFeedItemList = feedItemList;
+        mContext = context;
 
         final float dragElevation = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 8,
                 context.getResources().getDisplayMetrics());
 
-        this.mItemTouchHelper = new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(
+        mItemTouchHelper = new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(
                 ItemTouchHelper.UP | ItemTouchHelper.DOWN, 0 /* no swipe */) {
 
             @Override
@@ -248,15 +247,6 @@ class LocaleDragAndDropAdapter
         return result;
     }
 
-    LocaleStore.LocaleInfo getFirstChecked() {
-        for (LocaleStore.LocaleInfo li : mFeedItemList) {
-            if (li.getChecked()) {
-                return li;
-            }
-        }
-        return null;
-    }
-
     void addLocale(LocaleStore.LocaleInfo li) {
         mFeedItemList.add(li);
         notifyItemInserted(mFeedItemList.size() - 1);

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

@@ -18,7 +18,6 @@ package com.android.settings.localepicker;
 
 import android.app.AlertDialog;
 import android.app.FragmentTransaction;
-import android.content.Context;
 import android.content.DialogInterface;
 import android.os.Bundle;
 import android.os.LocaleList;
@@ -30,21 +29,24 @@ import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 
+import android.widget.TextView;
 import com.android.internal.app.LocalePicker;
 import com.android.internal.app.LocalePickerWithRegion;
 import com.android.internal.app.LocaleStore;
 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
 import com.android.settings.R;
-import com.android.settings.SettingsPreferenceFragment;
+import com.android.settings.RestrictedSettingsFragment;
 
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Locale;
 
+import static android.os.UserManager.DISALLOW_CONFIG_LOCALE;
+
 /**
  * Drag-and-drop editor for the user-ordered locale lists.
  */
-public class LocaleListEditor extends SettingsPreferenceFragment
+public class LocaleListEditor extends RestrictedSettingsFragment
         implements LocalePickerWithRegion.LocaleSelectedListener {
 
     private static final String CFGKEY_REMOVE_MODE = "localeRemoveMode";
@@ -56,6 +58,11 @@ public class LocaleListEditor extends SettingsPreferenceFragment
     private View mAddLanguage;
     private boolean mRemoveMode;
     private boolean mShowingRemoveDialog;
+    private boolean mIsUiRestricted;
+
+    public LocaleListEditor() {
+        super(DISALLOW_CONFIG_LOCALE);
+    }
 
     @Override
     public int getMetricsCategory() {
@@ -68,7 +75,7 @@ public class LocaleListEditor extends SettingsPreferenceFragment
         setHasOptionsMenu(true);
 
         LocaleStore.fillCache(this.getContext());
-        final List<LocaleStore.LocaleInfo> feedsList = getUserLocaleList(this.getContext());
+        final List<LocaleStore.LocaleInfo> feedsList = getUserLocaleList();
         mAdapter = new LocaleDragAndDropAdapter(this.getContext(), feedsList);
     }
 
@@ -81,6 +88,25 @@ public class LocaleListEditor extends SettingsPreferenceFragment
         return result;
     }
 
+    @Override
+    public void onResume() {
+        super.onResume();
+
+        final boolean previouslyRestricted = mIsUiRestricted;
+        mIsUiRestricted = isUiRestricted();
+        final TextView emptyView = getEmptyTextView();
+        if (mIsUiRestricted && !previouslyRestricted) {
+            // Lock it down.
+            emptyView.setText(R.string.language_empty_list_user_restricted);
+            emptyView.setVisibility(View.VISIBLE);
+            updateVisibilityOfRemoveMenu();
+        } else if (!mIsUiRestricted && previouslyRestricted) {
+            // Unlock it.
+            emptyView.setVisibility(View.GONE);
+            updateVisibilityOfRemoveMenu();
+        }
+    }
+
     @Override
     public void onViewStateRestored(Bundle savedInstanceState) {
         super.onViewStateRestored(savedInstanceState);
@@ -217,20 +243,18 @@ public class LocaleListEditor extends SettingsPreferenceFragment
         updateVisibilityOfRemoveMenu();
     }
 
-    private static List<LocaleStore.LocaleInfo> getUserLocaleList(Context context) {
+    private List<LocaleStore.LocaleInfo> getUserLocaleList() {
         final List<LocaleStore.LocaleInfo> result = new ArrayList<>();
-
         final LocaleList localeList = LocalePicker.getLocales();
         for (int i = 0; i < localeList.size(); i++) {
             Locale locale = localeList.get(i);
             result.add(LocaleStore.getLocaleInfo(locale));
         }
-
         return result;
     }
 
     private void configureDragAndDrop(View view) {
-        final RecyclerView list = (RecyclerView) view.findViewById(R.id.dragList);
+        final RecyclerView list = view.findViewById(R.id.dragList);
         final LocaleLinearLayoutManager llm = new LocaleLinearLayoutManager(getContext(), mAdapter);
         llm.setAutoMeasureEnabled(true);
         list.setLayoutManager(llm);
@@ -272,7 +296,8 @@ public class LocaleListEditor extends SettingsPreferenceFragment
         if (menuItemRemove != null) {
             menuItemRemove.setShowAsAction(
                     mRemoveMode ? MenuItem.SHOW_AS_ACTION_ALWAYS : MenuItem.SHOW_AS_ACTION_NEVER);
-            menuItemRemove.setVisible(mAdapter.getItemCount() > 1);
+            final boolean hasMultipleLanguages = mAdapter.getItemCount() > 1;
+            menuItemRemove.setVisible(hasMultipleLanguages && !mIsUiRestricted);
         }
     }
 }

tests/robotests/src/com/android/settings/localepicker/LocaleListEditorTest.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2017 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.localepicker;
+
+import android.content.Context;
+import android.view.View;
+import android.widget.TextView;
+import com.android.settings.TestConfig;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+import com.android.settings.testutils.shadow.ShadowSettingsPreferenceFragment;
+
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+import org.robolectric.util.ReflectionHelpers;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH,
+        sdk = TestConfig.SDK_VERSION,
+        shadows = { ShadowSettingsPreferenceFragment.class })
+public class LocaleListEditorTest {
+
+    private LocaleListEditor mLocaleListEditor;
+
+    @Before
+    public void setUp() {
+        mLocaleListEditor = new LocaleListEditor();
+        ReflectionHelpers.setField(mLocaleListEditor, "mEmptyTextView",
+                new TextView(RuntimeEnvironment.application));
+        ReflectionHelpers.setField(mLocaleListEditor, "mRestrictionsManager",
+                RuntimeEnvironment.application.getSystemService(Context.RESTRICTIONS_SERVICE));
+        ReflectionHelpers.setField(mLocaleListEditor, "mUserManager",
+                RuntimeEnvironment.application.getSystemService(Context.USER_SERVICE));
+    }
+
+    @Test
+    public void testDisallowConfigLocale_unrestrict() {
+        ReflectionHelpers.setField(mLocaleListEditor, "mIsUiRestricted", true);
+        mLocaleListEditor.onResume();
+        Assert.assertEquals(View.GONE, mLocaleListEditor.getEmptyTextView().getVisibility());
+    }
+
+    @Test
+    public void testDisallowConfigLocale_restrict() {
+        ReflectionHelpers.setField(mLocaleListEditor, "mIsUiRestricted", false);
+        mLocaleListEditor.onResume();
+        Assert.assertEquals(View.VISIBLE, mLocaleListEditor.getEmptyTextView().getVisibility());
+    }
+}

tests/robotests/src/com/android/settings/testutils/shadow/ShadowSettingsPreferenceFragment.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2017 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.testutils.shadow;
+
+import android.os.Bundle;
+
+import com.android.settings.SettingsPreferenceFragment;
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+
+/**
+ * Shadow of {@link SettingsPreferenceFragment}.
+ *
+ * Override the {@link #onCreate(Bundle)} to skip a null pointer exception in
+ * {@link android.content.res.Resources.Theme}, much the same as {@link ShadowDashboardFragment}.
+ */
+@Implements(SettingsPreferenceFragment.class)
+public class ShadowSettingsPreferenceFragment {
+
+    @Implementation
+    public void onCreate(Bundle savedInstanceState) {
+        // do nothing
+    }
+}