MeatAdapter.java

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/*
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 * Copyright 2014 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *     http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.adaptertransition;
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import android.content.Context;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.AbsListView;
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import android.widget.AdapterView;
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import android.widget.BaseAdapter;
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import android.widget.ImageView;
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import android.widget.TextView;
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import android.widget.Toast;
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/**
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 * This class provides data as Views. It is designed to support both ListView and GridView by
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 * changing a layout resource file to inflate.
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 */
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public class MeatAdapter extends BaseAdapter implements AbsListView.OnItemClickListener {
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    private final LayoutInflater mLayoutInflater;
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    private final int mResourceId;
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    /**
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     * Create a new instance of {@link MeatAdapter}.
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     *
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     * @param inflater   The layout inflater.
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     * @param resourceId The resource ID for the layout to be used. The layout should contain an
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     *                   ImageView with ID of "meat_image" and a TextView with ID of "meat_title".
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     */
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    public MeatAdapter(LayoutInflater inflater, int resourceId) {
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        mLayoutInflater = inflater;
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        mResourceId = resourceId;
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    }
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    @Override
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    public int getCount() {
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        return Meat.MEATS.length;
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    }
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    @Override
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    public Meat getItem(int position) {
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        return Meat.MEATS[position];
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    }
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    @Override
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    public long getItemId(int position) {
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        return Meat.MEATS[position].resourceId;
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    }
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    @Override
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    public View getView(int position, View convertView, ViewGroup parent) {
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        final View view;
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        final ViewHolder holder;
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        if (null == convertView) {
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            view = mLayoutInflater.inflate(mResourceId, parent, false);
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            holder = new ViewHolder();
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            assert view != null;
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            holder.image = (ImageView) view.findViewById(R.id.meat_image);
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            holder.title = (TextView) view.findViewById(R.id.meat_title);
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            view.setTag(holder);
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        } else {
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            view = convertView;
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            holder = (ViewHolder) view.getTag();
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        }
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        Meat meat = getItem(position);
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        holder.image.setImageResource(meat.resourceId);
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        holder.title.setText(meat.title);
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        return view;
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    }
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    @Override
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    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
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        ViewHolder holder = (ViewHolder) view.getTag();
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        Context context = view.getContext();
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        if (null != holder && null != holder.title && null != context) {
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            Toast.makeText(context, context.getString(R.string.item_clicked,
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                    holder.title.getText()), Toast.LENGTH_SHORT).show();
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        }
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    }
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    private static class ViewHolder {
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        public ImageView image;
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        public TextView title;
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    }
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}