Java tutorial
/* * Copyright (C) 2016 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.launcher3.dynamicui; import android.content.Context; import android.graphics.Color; import android.support.v4.graphics.ColorUtils; import android.support.v7.graphics.Palette; import android.util.Log; import com.android.launcher3.Utilities; /** * Saves and loads colors extracted from the wallpaper, as well as the associated wallpaper id. */ public class ExtractedColors { private static final String TAG = "ExtractedColors"; public static final int DEFAULT_LIGHT = Color.WHITE; public static final int DEFAULT_DARK = Color.BLACK; public static final int DEFAULT_COLOR = DEFAULT_LIGHT; // These color profile indices should NOT be changed, since they are used when saving and // loading extracted colors. New colors should always be added at the end. public static final int VERSION_INDEX = 0; public static final int HOTSEAT_INDEX = 1; public static final int STATUS_BAR_INDEX = 2; // public static final int VIBRANT_INDEX = 2; // public static final int VIBRANT_DARK_INDEX = 3; // public static final int VIBRANT_LIGHT_INDEX = 4; // public static final int MUTED_INDEX = 5; // public static final int MUTED_DARK_INDEX = 6; // public static final int MUTED_LIGHT_INDEX = 7; public static final int NUM_COLOR_PROFILES = 2; private static final int VERSION = 1; private static final String COLOR_SEPARATOR = ","; private int[] mColors; public ExtractedColors() { // The first entry is reserved for the version number. mColors = new int[NUM_COLOR_PROFILES + 1]; mColors[VERSION_INDEX] = VERSION; } public void setColorAtIndex(int index, int color) { if (index > VERSION_INDEX && index < mColors.length) { mColors[index] = color; } else { Log.e(TAG, "Attempted to set a color at an invalid index " + index); } } /** * Encodes {@link #mColors} as a comma-separated String. */ String encodeAsString() { StringBuilder colorsStringBuilder = new StringBuilder(); for (int color : mColors) { colorsStringBuilder.append(color).append(COLOR_SEPARATOR); } return colorsStringBuilder.toString(); } /** * Decodes a comma-separated String into {@link #mColors}. */ void decodeFromString(String colorsString) { String[] splitColorsString = colorsString.split(COLOR_SEPARATOR); mColors = new int[splitColorsString.length]; for (int i = 0; i < mColors.length; i++) { mColors[i] = Integer.parseInt(splitColorsString[i]); } } /** * Loads colors and wallpaper id from {@link Utilities#getPrefs(Context)}. * These were saved there in {@link ColorExtractionService}. */ public void load(Context context) { String encodedString = Utilities.getPrefs(context) .getString(ExtractionUtils.EXTRACTED_COLORS_PREFERENCE_KEY, VERSION + ""); decodeFromString(encodedString); if (mColors[VERSION_INDEX] != VERSION) { ExtractionUtils.startColorExtractionService(context); } } /** @param index must be one of the index values defined at the top of this class. */ public int getColor(int index, int defaultColor) { if (index > VERSION_INDEX && index < mColors.length) { return mColors[index]; } return defaultColor; } /** * Updates colors based on the palette. * If the palette is null, the default color is used in all cases. */ public void updatePalette(Palette palette) { if (palette == null) { for (int i = 0; i < NUM_COLOR_PROFILES; i++) { setColorAtIndex(i, ExtractedColors.DEFAULT_COLOR); } } else { // We currently don't use any of the colors defined by the Palette API, // but this is how we would add them if we ever need them. // setColorAtIndex(ExtractedColors.VIBRANT_INDEX, // palette.getVibrantColor(ExtractedColors.DEFAULT_COLOR)); // setColorAtIndex(ExtractedColors.VIBRANT_DARK_INDEX, // palette.getDarkVibrantColor(ExtractedColors.DEFAULT_DARK)); // setColorAtIndex(ExtractedColors.VIBRANT_LIGHT_INDEX, // palette.getLightVibrantColor(ExtractedColors.DEFAULT_LIGHT)); // setColorAtIndex(ExtractedColors.MUTED_INDEX, // palette.getMutedColor(DEFAULT_COLOR)); // setColorAtIndex(ExtractedColors.MUTED_DARK_INDEX, // palette.getDarkMutedColor(ExtractedColors.DEFAULT_DARK)); // setColorAtIndex(ExtractedColors.MUTED_LIGHT_INDEX, // palette.getLightVibrantColor(ExtractedColors.DEFAULT_LIGHT)); } } /** * The hotseat's color is defined as follows: * - 12% black for super light wallpaper * - 18% white for super dark * - 25% white otherwise */ public void updateHotseatPalette(Palette hotseatPalette) { int hotseatColor; if (hotseatPalette != null && ExtractionUtils.isSuperLight(hotseatPalette)) { hotseatColor = ColorUtils.setAlphaComponent(Color.BLACK, (int) (0.12f * 255)); } else if (hotseatPalette != null && ExtractionUtils.isSuperDark(hotseatPalette)) { hotseatColor = ColorUtils.setAlphaComponent(Color.WHITE, (int) (0.18f * 255)); } else { hotseatColor = ColorUtils.setAlphaComponent(Color.WHITE, (int) (0.25f * 255)); } setColorAtIndex(HOTSEAT_INDEX, hotseatColor); } public void updateStatusBarPalette(Palette statusBarPalette) { setColorAtIndex(STATUS_BAR_INDEX, ExtractionUtils.isSuperLight(statusBarPalette) ? DEFAULT_LIGHT : DEFAULT_DARK); } }