Polish humanize strings for Caption preferences page

- Add intro for usage
- Update footer description on limitations
- Update the default caption size to medium
- Update the caption size and style dynamically

Bug: 218409087
Test: make RunSettingsRoboTests
ROBOTEST_FILTER=CaptionAppearancePreferenceControllerTest

Change-Id: I6526250894cc6a3fd02e3d8c675280855b307a68

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

@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2022 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.content.Context;
+import android.view.accessibility.CaptioningManager;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+
+import com.google.common.primitives.Floats;
+import com.google.common.primitives.Ints;
+
+/** Controller that shows the caption scale and style summary. */
+public class CaptionAppearancePreferenceController extends BasePreferenceController {
+
+    private final CaptioningManager mCaptioningManager;
+
+    public CaptionAppearancePreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+        mCaptioningManager = context.getSystemService(CaptioningManager.class);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        return mContext.getString(R.string.preference_summary_default_combination,
+                geFontScaleSummary(), getPresetSummary());
+    }
+
+    private float[] getFontScaleValuesArray() {
+        final String[] fontScaleValuesStrArray = mContext.getResources().getStringArray(
+                R.array.captioning_font_size_selector_values);
+        final int length = fontScaleValuesStrArray.length;
+        final float[] fontScaleValuesArray = new float[length];
+        for (int i = 0; i < length; ++i) {
+            fontScaleValuesArray[i] = Float.parseFloat(fontScaleValuesStrArray[i]);
+        }
+        return fontScaleValuesArray;
+    }
+
+    private CharSequence geFontScaleSummary() {
+        final float[] fontScaleValuesArray = getFontScaleValuesArray();
+        final String[] fontScaleSummaries = mContext.getResources().getStringArray(
+                R.array.captioning_font_size_selector_titles);
+        final float fontScale = mCaptioningManager.getFontScale();
+        final int idx = Floats.indexOf(fontScaleValuesArray, fontScale);
+        return fontScaleSummaries[idx == /* not exist */ -1 ? 0 : idx];
+    }
+
+    private CharSequence getPresetSummary() {
+        final int[] presetValuesArray = mContext.getResources().getIntArray(
+                R.array.captioning_preset_selector_values);
+        final String[] presetSummaries = mContext.getResources().getStringArray(
+                R.array.captioning_preset_selector_titles);
+        final int preset = mCaptioningManager.getRawUserStyle();
+        final int idx = Ints.indexOf(presetValuesArray, preset);
+        return presetSummaries[idx];
+    }
+}

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

@@ -34,8 +34,6 @@ import com.android.settings.widget.SettingsMainSwitchPreference;
 import com.android.settingslib.search.SearchIndexable;
 import com.android.settingslib.widget.OnMainSwitchChangeListener;
 
-import com.google.common.primitives.Floats;
-
 import java.util.ArrayList;
 import java.util.List;
 
@@ -56,7 +54,6 @@ public class CaptionPropertiesFragment extends DashboardFragment
     private Preference mMoreOptions;
 
     private final List<Preference> mPreferenceList = new ArrayList<>();
-    private float[] mFontSizeValuesArray;
 
     @Override
     public int getMetricsCategory() {
@@ -71,13 +68,12 @@ public class CaptionPropertiesFragment extends DashboardFragment
 
         initializeAllPreferences();
         installUpdateListeners();
-        initFontSizeValuesArray();
     }
 
     @Override
     public void onResume() {
         super.onResume();
-        updateAllPreferences();
+        mSwitch.setChecked(mCaptioningManager.isEnabled());
     }
 
     @Override
@@ -105,21 +101,6 @@ public class CaptionPropertiesFragment extends DashboardFragment
 
     }
 
-    private void initFontSizeValuesArray() {
-        final String[] fontSizeValuesStrArray = getPrefContext().getResources().getStringArray(
-                R.array.captioning_font_size_selector_values);
-        final int length = fontSizeValuesStrArray.length;
-        mFontSizeValuesArray = new float[length];
-        for (int i = 0; i < length; ++i) {
-            mFontSizeValuesArray[i] = Float.parseFloat(fontSizeValuesStrArray[i]);
-        }
-    }
-
-    private void updateAllPreferences() {
-        mSwitch.setChecked(mCaptioningManager.isEnabled());
-        mTextAppearance.setSummary(geTextAppearanceSummary(getPrefContext()));
-    }
-
     @Override
     public boolean onPreferenceChange(Preference preference, Object value) {
         final ContentResolver cr = getActivity().getContentResolver();
@@ -136,16 +117,6 @@ public class CaptionPropertiesFragment extends DashboardFragment
         return R.string.help_url_caption;
     }
 
-    private CharSequence geTextAppearanceSummary(Context context) {
-        final String[] fontSizeSummaries = context.getResources().getStringArray(
-                R.array.captioning_font_size_selector_summaries);
-
-        final float fontSize = mCaptioningManager.getFontScale();
-        final int idx = Floats.indexOf(mFontSizeValuesArray, fontSize);
-
-        return fontSizeSummaries[idx == /* not exist */ -1 ? 0 : idx];
-    }
-
     public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
             new BaseSearchIndexProvider(R.xml.captioning_settings);