Support caption second UI structure (2/n)

Group text size and style into appearance page.
Move language under more options page.

Bug: 143502915
Test: Maunal
Change-Id: Ice104ed844dc3a10a22c91a10211a8978da68cc3

src/com/android/settings/accessibility/CaptionMoreOptionsFragment.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2019 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.accessibility;
+
+import android.app.settings.SettingsEnums;
+import android.content.ContentResolver;
+import android.content.Context;
+import android.os.Bundle;
+import android.provider.Settings;
+import android.view.accessibility.CaptioningManager;
+
+import androidx.preference.Preference;
+
+import com.android.settings.R;
+import com.android.settings.SettingsPreferenceFragment;
+
+/**
+ * Settings fragment containing more options of captioning properties.
+ */
+public class CaptionMoreOptionsFragment extends SettingsPreferenceFragment
+        implements Preference.OnPreferenceChangeListener {
+    private static final String PREF_LOCALE = "captioning_locale";
+
+    private CaptioningManager mCaptioningManager;
+
+    private LocalePreference mLocale;
+
+    @Override
+    public int getMetricsCategory() {
+        return SettingsEnums.ACCESSIBILITY_CAPTION_PROPERTIES;
+    }
+
+    @Override
+    public void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+
+        mCaptioningManager = (CaptioningManager) getSystemService(Context.CAPTIONING_SERVICE);
+
+        addPreferencesFromResource(R.xml.captioning_more_options);
+        initializeAllPreferences();
+        updateAllPreferences();
+        installUpdateListeners();
+    }
+
+    private void initializeAllPreferences() {
+        mLocale = (LocalePreference) findPreference(PREF_LOCALE);
+    }
+
+    private void installUpdateListeners() {
+        mLocale.setOnPreferenceChangeListener(this);
+    }
+
+    private void updateAllPreferences() {
+        final String rawLocale = mCaptioningManager.getRawLocale();
+        mLocale.setValue(rawLocale == null ? "" : rawLocale);
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object value) {
+        final ContentResolver cr = getActivity().getContentResolver();
+        if (mLocale == preference) {
+            Settings.Secure.putString(
+                    cr, Settings.Secure.ACCESSIBILITY_CAPTIONING_LOCALE, (String) value);
+        }
+
+        return true;
+    }
+}