1 /* 2 * Copyright (C) 2016 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.car.radio; 18 19 import android.content.Context; 20 import android.hardware.radio.RadioManager; 21 import android.support.annotation.ColorInt; 22 import android.support.annotation.NonNull; 23 import com.android.car.radio.service.RadioStation; 24 25 /** 26 * A class that will take a {@link RadioStation} and return its corresponding color. The colors 27 * for different channels can be found on go/aae-ncar-por in the radio section. 28 */ 29 public class RadioChannelColorMapper { 30 // AM values range from 530 - 1700. The following two values represent where this range is cut 31 // into thirds. 32 private static final int AM_LOW_THIRD_RANGE = 920; 33 private static final int AM_HIGH_THIRD_RANGE = 1210; 34 35 // FM values range from 87.9 - 108.1 kHz. The following two values represent where this range 36 // is cut into thirds. 37 private static final int FM_LOW_THIRD_RANGE = 94600; 38 private static final int FM_HIGH_THIRD_RANGE = 101300; 39 40 @ColorInt private final int mDefaultColor; 41 @ColorInt private final int mAmRange1Color; 42 @ColorInt private final int mAmRange2Color; 43 @ColorInt private final int mAmRange3Color; 44 @ColorInt private final int mFmRange1Color; 45 @ColorInt private final int mFmRange2Color; 46 @ColorInt private final int mFmRange3Color; 47 getInstance(Context context)48 public static RadioChannelColorMapper getInstance(Context context) { 49 return new RadioChannelColorMapper(context); 50 } 51 RadioChannelColorMapper(Context context)52 private RadioChannelColorMapper(Context context) { 53 mDefaultColor = context.getColor(R.color.car_radio_bg_color); 54 mAmRange1Color = context.getColor(R.color.am_range_1_bg_color); 55 mAmRange2Color = context.getColor(R.color.am_range_2_bg_color); 56 mAmRange3Color = context.getColor(R.color.am_range_3_bg_color); 57 mFmRange1Color = context.getColor(R.color.fm_range_1_bg_color); 58 mFmRange2Color = context.getColor(R.color.fm_range_2_bg_color); 59 mFmRange3Color = context.getColor(R.color.fm_range_3_bg_color); 60 } 61 62 /** 63 * Returns the default color for the radio. 64 */ 65 @ColorInt getDefaultColor()66 public int getDefaultColor() { 67 return mDefaultColor; 68 } 69 70 /** 71 * Convenience method for returning a color based on a {@link RadioStation}. 72 * 73 * @see {@link #getColorForStation(int, int)} 74 */ 75 @ColorInt getColorForStation(@onNull RadioStation radioStation)76 public int getColorForStation(@NonNull RadioStation radioStation) { 77 return getColorForStation(radioStation.getRadioBand(), radioStation.getChannelNumber()); 78 } 79 80 /** 81 * Returns the color that should be used for the given radio band and channel. If a match cannot 82 * be made, then {@link #mDefaultColor} is returned. 83 * 84 * @param band One of {@link RadioManager}'s band values. (e.g. {@link RadioManager#BAND_AM}. 85 * @param channel The channel frequency in Hertz. 86 */ 87 @ColorInt getColorForStation(int band, int channel)88 public int getColorForStation(int band, int channel) { 89 switch (band) { 90 case RadioManager.BAND_AM: 91 if (channel < AM_LOW_THIRD_RANGE) { 92 return mAmRange1Color; 93 } else if (channel > AM_HIGH_THIRD_RANGE) { 94 return mAmRange3Color; 95 } 96 97 return mAmRange2Color; 98 99 case RadioManager.BAND_FM: 100 if (channel < FM_LOW_THIRD_RANGE) { 101 return mFmRange1Color; 102 } else if (channel > FM_HIGH_THIRD_RANGE) { 103 return mFmRange3Color; 104 } 105 106 return mFmRange2Color; 107 108 default: 109 return mDefaultColor; 110 } 111 } 112 } 113