1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.settings.display; 18 19 import android.annotation.Nullable; 20 import android.app.settings.SettingsEnums; 21 import android.content.ContentResolver; 22 import android.content.Context; 23 import android.content.res.Configuration; 24 import android.content.res.Resources; 25 import android.os.Bundle; 26 import android.provider.Settings; 27 28 import com.android.settings.R; 29 import com.android.settings.search.BaseSearchIndexProvider; 30 import com.android.settingslib.search.SearchIndexable; 31 32 /** 33 * Preference fragment used to control font size. 34 */ 35 @SearchIndexable 36 public class ToggleFontSizePreferenceFragment extends PreviewSeekBarPreferenceFragment { 37 38 private float[] mValues; 39 40 @Override getActivityLayoutResId()41 protected int getActivityLayoutResId() { 42 return R.layout.font_size_activity; 43 } 44 45 @Override getPreviewSampleResIds()46 protected int[] getPreviewSampleResIds() { 47 return new int[]{R.layout.font_size_preview}; 48 } 49 50 @Override onCreate(@ullable Bundle savedInstanceState)51 public void onCreate(@Nullable Bundle savedInstanceState) { 52 super.onCreate(savedInstanceState); 53 54 final Resources res = getContext().getResources(); 55 final ContentResolver resolver = getContext().getContentResolver(); 56 // Mark the appropriate item in the preferences list. 57 mEntries = res.getStringArray(R.array.entries_font_size); 58 final String[] strEntryValues = res.getStringArray(R.array.entryvalues_font_size); 59 final float currentScale = 60 Settings.System.getFloat(resolver, Settings.System.FONT_SCALE, 1.0f); 61 mInitialIndex = fontSizeValueToIndex(currentScale, strEntryValues); 62 mValues = new float[strEntryValues.length]; 63 for (int i = 0; i < strEntryValues.length; ++i) { 64 mValues[i] = Float.parseFloat(strEntryValues[i]); 65 } 66 getActivity().setTitle(R.string.title_font_size); 67 } 68 69 @Override createConfig(Configuration origConfig, int index)70 protected Configuration createConfig(Configuration origConfig, int index) { 71 // Populate the sample layouts. 72 final Configuration config = new Configuration(origConfig); 73 config.fontScale = mValues[index]; 74 return config; 75 } 76 77 /** 78 * Persists the selected font size. 79 */ 80 @Override commit()81 protected void commit() { 82 if (getContext() == null) return; 83 final ContentResolver resolver = getContext().getContentResolver(); 84 Settings.System.putFloat(resolver, Settings.System.FONT_SCALE, mValues[mCurrentIndex]); 85 } 86 87 @Override getHelpResource()88 public int getHelpResource() { 89 return R.string.help_url_font_size; 90 } 91 92 @Override getMetricsCategory()93 public int getMetricsCategory() { 94 return SettingsEnums.ACCESSIBILITY_FONT_SIZE; 95 } 96 97 /** 98 * Utility function that returns the index in a string array with which the represented value is 99 * the closest to a given float value. 100 */ fontSizeValueToIndex(float val, String[] indices)101 public static int fontSizeValueToIndex(float val, String[] indices) { 102 float lastVal = Float.parseFloat(indices[0]); 103 for (int i = 1; i < indices.length; i++) { 104 float thisVal = Float.parseFloat(indices[i]); 105 if (val < (lastVal + (thisVal - lastVal) * .5f)) { 106 return i - 1; 107 } 108 lastVal = thisVal; 109 } 110 return indices.length - 1; 111 } 112 113 public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER = 114 new BaseSearchIndexProvider() { 115 @Override 116 protected boolean isPageSearchEnabled(Context context) { 117 return false; 118 } 119 }; 120 121 } 122