1 /* 2 * Copyright 2014 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.example.android.adaptertransition; 18 19 import android.content.Context; 20 import android.view.LayoutInflater; 21 import android.view.View; 22 import android.view.ViewGroup; 23 import android.widget.AbsListView; 24 import android.widget.AdapterView; 25 import android.widget.BaseAdapter; 26 import android.widget.ImageView; 27 import android.widget.TextView; 28 import android.widget.Toast; 29 30 /** 31 * This class provides data as Views. It is designed to support both ListView and GridView by 32 * changing a layout resource file to inflate. 33 */ 34 public class MeatAdapter extends BaseAdapter implements AbsListView.OnItemClickListener { 35 36 private final LayoutInflater mLayoutInflater; 37 private final int mResourceId; 38 39 /** 40 * Create a new instance of {@link MeatAdapter}. 41 * 42 * @param inflater The layout inflater. 43 * @param resourceId The resource ID for the layout to be used. The layout should contain an 44 * ImageView with ID of "meat_image" and a TextView with ID of "meat_title". 45 */ MeatAdapter(LayoutInflater inflater, int resourceId)46 public MeatAdapter(LayoutInflater inflater, int resourceId) { 47 mLayoutInflater = inflater; 48 mResourceId = resourceId; 49 } 50 51 @Override getCount()52 public int getCount() { 53 return Meat.MEATS.length; 54 } 55 56 @Override getItem(int position)57 public Meat getItem(int position) { 58 return Meat.MEATS[position]; 59 } 60 61 @Override getItemId(int position)62 public long getItemId(int position) { 63 return Meat.MEATS[position].resourceId; 64 } 65 66 @Override getView(int position, View convertView, ViewGroup parent)67 public View getView(int position, View convertView, ViewGroup parent) { 68 final View view; 69 final ViewHolder holder; 70 if (null == convertView) { 71 view = mLayoutInflater.inflate(mResourceId, parent, false); 72 holder = new ViewHolder(); 73 assert view != null; 74 holder.image = (ImageView) view.findViewById(R.id.meat_image); 75 holder.title = (TextView) view.findViewById(R.id.meat_title); 76 view.setTag(holder); 77 } else { 78 view = convertView; 79 holder = (ViewHolder) view.getTag(); 80 } 81 Meat meat = getItem(position); 82 holder.image.setImageResource(meat.resourceId); 83 holder.title.setText(meat.title); 84 return view; 85 } 86 87 @Override onItemClick(AdapterView<?> parent, View view, int position, long id)88 public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 89 ViewHolder holder = (ViewHolder) view.getTag(); 90 Context context = view.getContext(); 91 if (null != holder && null != holder.title && null != context) { 92 Toast.makeText(context, context.getString(R.string.item_clicked, 93 holder.title.getText()), Toast.LENGTH_SHORT).show(); 94 } 95 } 96 97 private static class ViewHolder { 98 public ImageView image; 99 public TextView title; 100 } 101 102 } 103