Tony Wickham
462b5cca7b
- Only considers the bottom fourth of the wallpaper - Is translucent black or white depending on how dark/light the wallpaper is - Hotseat extends behind the nav bar Bug: 27230217 Change-Id: Id4ea6ee91b4dd221b4c277d22d5041cab178801d
118 lines
4.7 KiB
Java
118 lines
4.7 KiB
Java
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.launcher3.dynamicui;
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import android.app.WallpaperManager;
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import android.content.Context;
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import android.content.Intent;
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import android.content.SharedPreferences;
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import android.graphics.Color;
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import android.support.v4.graphics.ColorUtils;
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import android.support.v7.graphics.Palette;
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import com.android.launcher3.Utilities;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.List;
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/**
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* Contains helper fields and methods related to extracting colors from the wallpaper.
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*/
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public class ExtractionUtils {
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public static final String EXTRACTED_COLORS_PREFERENCE_KEY = "pref_extractedColors";
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public static final String WALLPAPER_ID_PREFERENCE_KEY = "pref_wallpaperId";
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private static final int FLAG_SET_SYSTEM = 1 << 0; // TODO: use WallpaperManager.FLAG_SET_SYSTEM
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private static final float MIN_CONTRAST_RATIO = 2f;
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/**
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* Extract colors in the :wallpaper-chooser process, if the wallpaper id has changed.
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* When the new colors are saved in the LauncherProvider,
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* Launcher will be notified in Launcher#onSettingsChanged(String, String).
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*/
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public static void startColorExtractionServiceIfNecessary(final Context context) {
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// Run on a background thread, since the service is asynchronous anyway.
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Utilities.THREAD_POOL_EXECUTOR.execute(new Runnable() {
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@Override
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public void run() {
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if (hasWallpaperIdChanged(context)) {
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startColorExtractionService(context);
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}
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}
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});
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}
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/** Starts the {@link ColorExtractionService} without checking the wallpaper id */
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public static void startColorExtractionService(Context context) {
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context.startService(new Intent(context, ColorExtractionService.class));
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}
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private static boolean hasWallpaperIdChanged(Context context) {
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if (!Utilities.isNycOrAbove()) {
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// TODO: update an id in sharedprefs in onWallpaperChanged broadcast, and read it here.
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return false;
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}
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final SharedPreferences sharedPrefs = Utilities.getPrefs(context);
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int wallpaperId = getWallpaperId(WallpaperManager.getInstance(context));
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int savedWallpaperId = sharedPrefs.getInt(ExtractionUtils.WALLPAPER_ID_PREFERENCE_KEY, -1);
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return wallpaperId != savedWallpaperId;
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}
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public static int getWallpaperId(WallpaperManager wallpaperManager) {
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// TODO: use WallpaperManager#getWallpaperId(WallpaperManager.FLAG_SET_SYSTEM) directly.
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try {
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Method getWallpaperId = WallpaperManager.class.getMethod("getWallpaperId", int.class);
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return (int) getWallpaperId.invoke(wallpaperManager, FLAG_SET_SYSTEM);
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} catch (InvocationTargetException | NoSuchMethodException | IllegalAccessException e) {
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return -1;
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}
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}
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public static boolean isSuperLight(Palette p) {
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return !isLegibleOnWallpaper(Color.WHITE, p.getSwatches());
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}
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public static boolean isSuperDark(Palette p) {
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return !isLegibleOnWallpaper(Color.BLACK, p.getSwatches());
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}
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/**
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* Given a color, returns true if that color is legible on
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* the given wallpaper color swatches, else returns false.
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*/
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private static boolean isLegibleOnWallpaper(int color, List<Palette.Swatch> wallpaperSwatches) {
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int legiblePopulation = 0;
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int illegiblePopulation = 0;
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for (Palette.Swatch swatch : wallpaperSwatches) {
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if (isLegible(color, swatch.getRgb())) {
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legiblePopulation += swatch.getPopulation();
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} else {
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illegiblePopulation += swatch.getPopulation();
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}
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}
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return legiblePopulation > illegiblePopulation;
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}
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/** @return Whether the foreground color is legible on the background color. */
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private static boolean isLegible(int foreground, int background) {
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background = ColorUtils.setAlphaComponent(background, 255);
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return ColorUtils.calculateContrast(foreground, background) >= MIN_CONTRAST_RATIO;
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}
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}
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