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