1 /* 2 * Copyright (C) 2012 Google Inc. 3 * Licensed to The Android Open Source Project. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package com.android.mail.bitmap; 18 19 import android.content.res.Resources; 20 import android.content.res.TypedArray; 21 22 import com.android.mail.R; 23 24 public interface ColorPicker { 25 /** 26 * Returns the color to use for the given email address. 27 * This method should return the same output for the same input. 28 * @param email The normalized email address. 29 * @return The color value in the format {@code 0xAARRGGBB}. 30 */ pickColor(final String email)31 public int pickColor(final String email); 32 33 /** 34 * A simple implementation of a {@link ColorPicker}. 35 */ 36 public class PaletteColorPicker implements ColorPicker { 37 /** 38 * The palette of colors, inflated from {@code R.array.letter_tile_colors}. 39 */ 40 private static TypedArray sColors; 41 42 /** 43 * Cached value of {@code sColors.length()}. 44 */ 45 private static int sColorCount; 46 47 /** 48 * Default color returned if the one chosen from {@code R.array.letter_tile_colors} is 49 * a {@link android.content.res.ColorStateList}. 50 */ 51 private static int sDefaultColor; 52 PaletteColorPicker(Resources res)53 public PaletteColorPicker(Resources res) { 54 if (sColors == null) { 55 sColors = res.obtainTypedArray(R.array.letter_tile_colors); 56 sColorCount = sColors.length(); 57 sDefaultColor = res.getColor(R.color.letter_tile_default_color); 58 } 59 } 60 61 @Override pickColor(final String email)62 public int pickColor(final String email) { 63 final int color = Math.abs(email.hashCode()) % sColorCount; 64 return sColors.getColor(color, sDefaultColor); 65 } 66 } 67 } 68