1 /* 2 * Copyright (C) 2015 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.Context; 22 import android.content.res.Configuration; 23 import android.content.res.Resources; 24 import android.os.Bundle; 25 import android.view.Display; 26 27 import com.android.settings.R; 28 import com.android.settings.search.BaseSearchIndexProvider; 29 import com.android.settings.search.Indexable; 30 import com.android.settings.search.SearchIndexableRaw; 31 import com.android.settingslib.display.DisplayDensityUtils; 32 import com.android.settingslib.search.SearchIndexable; 33 34 import java.util.ArrayList; 35 import java.util.List; 36 37 /** 38 * Preference fragment used to control screen zoom. 39 */ 40 @SearchIndexable(forTarget = SearchIndexable.ALL & ~SearchIndexable.ARC) 41 public class ScreenZoomSettings extends PreviewSeekBarPreferenceFragment { 42 43 private int mDefaultDensity; 44 private int[] mValues; 45 46 @Override getActivityLayoutResId()47 protected int getActivityLayoutResId() { 48 return R.layout.screen_zoom_activity; 49 } 50 51 @Override getPreviewSampleResIds()52 protected int[] getPreviewSampleResIds() { 53 return getContext().getResources().getBoolean( 54 R.bool.config_enable_extra_screen_zoom_preview) 55 ? new int[]{ 56 R.layout.screen_zoom_preview_1, 57 R.layout.screen_zoom_preview_2, 58 R.layout.screen_zoom_preview_settings} 59 : new int[]{R.layout.screen_zoom_preview_1}; 60 } 61 62 @Override onCreate(@ullable Bundle savedInstanceState)63 public void onCreate(@Nullable Bundle savedInstanceState) { 64 super.onCreate(savedInstanceState); 65 66 final DisplayDensityUtils density = new DisplayDensityUtils(getContext()); 67 68 final int initialIndex = density.getCurrentIndex(); 69 if (initialIndex < 0) { 70 // Failed to obtain default density, which means we failed to 71 // connect to the window manager service. Just use the current 72 // density and don't let the user change anything. 73 final int densityDpi = getResources().getDisplayMetrics().densityDpi; 74 mValues = new int[]{densityDpi}; 75 mEntries = new String[]{getString(DisplayDensityUtils.SUMMARY_DEFAULT)}; 76 mInitialIndex = 0; 77 mDefaultDensity = densityDpi; 78 } else { 79 mValues = density.getValues(); 80 mEntries = density.getEntries(); 81 mInitialIndex = initialIndex; 82 mDefaultDensity = density.getDefaultDensity(); 83 } 84 85 getActivity().setTitle(R.string.screen_zoom_title); 86 } 87 88 @Override createConfig(Configuration origConfig, int index)89 protected Configuration createConfig(Configuration origConfig, int index) { 90 // Populate the sample layouts. 91 final Configuration config = new Configuration(origConfig); 92 config.densityDpi = mValues[index]; 93 return config; 94 } 95 96 /** 97 * Persists the selected density and sends a configuration change. 98 */ 99 @Override commit()100 protected void commit() { 101 final int densityDpi = mValues[mCurrentIndex]; 102 if (densityDpi == mDefaultDensity) { 103 DisplayDensityUtils.clearForcedDisplayDensity(Display.DEFAULT_DISPLAY); 104 } else { 105 DisplayDensityUtils.setForcedDisplayDensity(Display.DEFAULT_DISPLAY, densityDpi); 106 } 107 } 108 109 @Override getHelpResource()110 public int getHelpResource() { 111 return R.string.help_url_display_size; 112 } 113 114 @Override getMetricsCategory()115 public int getMetricsCategory() { 116 return SettingsEnums.DISPLAY_SCREEN_ZOOM; 117 } 118 119 /** Index provider used to expose this fragment in search. */ 120 public static final Indexable.SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER = 121 new BaseSearchIndexProvider() { 122 @Override 123 public List<SearchIndexableRaw> getRawDataToIndex(Context context, 124 boolean enabled) { 125 final Resources res = context.getResources(); 126 final SearchIndexableRaw data = new SearchIndexableRaw(context); 127 data.title = res.getString(R.string.screen_zoom_title); 128 data.key = "screen_zoom_settings"; 129 data.screenTitle = res.getString(R.string.screen_zoom_title); 130 data.keywords = res.getString(R.string.screen_zoom_keywords); 131 132 final List<SearchIndexableRaw> result = new ArrayList<>(1); 133 result.add(data); 134 return result; 135 } 136 }; 137 } 138