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.support.v7.widget.RecyclerView; 20 import android.util.Log; 21 import android.view.LayoutInflater; 22 import android.view.View; 23 import android.view.ViewGroup; 24 import com.android.car.radio.service.RadioStation; 25 import com.android.car.view.PagedListView; 26 27 import java.util.List; 28 29 /** 30 * Adapter that will display a list of radio stations that represent the user's presets. 31 */ 32 public class PresetsAdapter extends RecyclerView.Adapter<PresetsViewHolder> 33 implements PresetsViewHolder.OnPresetClickListener, PagedListView.ItemCap { 34 private static final String TAG = "Em.PresetsAdapter"; 35 36 // Only one type of view in this adapter. 37 private static final int PRESETS_VIEW_TYPE = 0; 38 39 private RadioStation mActiveRadioStation; 40 41 private List<RadioStation> mPresets; 42 private OnPresetItemClickListener mPresetClickListener; 43 44 /** 45 * Interface for a listener that will be notified when an item in the presets list has been 46 * clicked. 47 */ 48 public interface OnPresetItemClickListener { 49 /** 50 * Method called when an item in the preset list has been clicked. 51 * 52 * @param radioStation The {@link RadioStation} corresponding to the clicked preset. 53 */ onPresetItemClicked(RadioStation radioStation)54 void onPresetItemClicked(RadioStation radioStation); 55 } 56 57 /** 58 * Set a listener to be notified whenever a preset card is pressed. 59 */ setOnPresetItemClickListener(OnPresetItemClickListener listener)60 public void setOnPresetItemClickListener(OnPresetItemClickListener listener) { 61 mPresetClickListener = listener; 62 } 63 64 /** 65 * Sets the given list as the list of presets to display. 66 */ setPresets(List<RadioStation> presets)67 public void setPresets(List<RadioStation> presets) { 68 mPresets = presets; 69 notifyDataSetChanged(); 70 } 71 72 /** 73 * Indicates which radio station is the active one inside the list of presets that are set on 74 * this adapter. This will cause that station to be highlighted in the list. If the station 75 * passed to this method does not match any of the presets, then none will be highlighted. 76 */ setActiveRadioStation(RadioStation station)77 public void setActiveRadioStation(RadioStation station) { 78 mActiveRadioStation = station; 79 notifyDataSetChanged(); 80 } 81 82 @Override onCreateViewHolder(ViewGroup parent, int viewType)83 public PresetsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 84 View view = LayoutInflater.from(parent.getContext()) 85 .inflate(R.layout.radio_preset_stream_card, parent, false); 86 87 return new PresetsViewHolder(view, this /* listener */); 88 } 89 90 @Override onBindViewHolder(PresetsViewHolder holder, int position)91 public void onBindViewHolder(PresetsViewHolder holder, int position) { 92 RadioStation station = mPresets.get(position); 93 boolean isActiveStation = station.equals(mActiveRadioStation); 94 95 holder.bindPreset(station, isActiveStation, getItemCount()); 96 } 97 98 @Override onPresetClicked(int position)99 public void onPresetClicked(int position) { 100 if (Log.isLoggable(TAG, Log.DEBUG)) { 101 Log.d(TAG, String.format("onPresetClicked(); item count: %d; position: %d", 102 getItemCount(), position)); 103 } 104 105 if (mPresetClickListener != null && getItemCount() > position) { 106 mPresetClickListener.onPresetItemClicked(mPresets.get(position)); 107 } 108 } 109 110 @Override getItemViewType(int position)111 public int getItemViewType(int position) { 112 return PRESETS_VIEW_TYPE; 113 } 114 115 @Override getItemCount()116 public int getItemCount() { 117 return mPresets == null ? 0 : mPresets.size(); 118 } 119 120 @Override setMaxItems(int max)121 public void setMaxItems(int max) { 122 // No-op. A PagedListView needs the ItemCap interface to be implemented. However, the 123 // list of presets should not be limited. 124 } 125 } 126