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      1 /*
      2  * Copyright (C) 2017 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.support.text.emoji;
     18 
     19 import android.content.Context;
     20 import android.os.Bundle;
     21 import android.view.LayoutInflater;
     22 import android.view.View;
     23 import android.view.ViewGroup;
     24 import android.widget.ArrayAdapter;
     25 import android.widget.ListView;
     26 import android.widget.TextView;
     27 
     28 import androidx.annotation.NonNull;
     29 import androidx.fragment.app.Fragment;
     30 
     31 import java.util.List;
     32 
     33 /**
     34  * UI to list all supported emojis.
     35  */
     36 
     37 public class ListFragment extends Fragment {
     38 
     39     private ListView mListView;
     40 
     41     static ListFragment newInstance() {
     42         ListFragment fragment = new ListFragment();
     43         return fragment;
     44     }
     45 
     46     @Override
     47     public View onCreateView(LayoutInflater inflater, ViewGroup container,
     48             Bundle savedInstanceState) {
     49         final View view = inflater.inflate(R.layout.fragment_list, container, false);
     50         mListView = view.findViewById(R.id.list);
     51         loadList();
     52         return view;
     53     }
     54 
     55     private void loadList() {
     56         final ArrayAdapter<EmojiRepo.EmojiData> adapter = new MyArrayAdapter(getActivity(),
     57                 R.layout.list_item_emoji, R.id.text, EmojiRepo.getEmojis());
     58         final int index = mListView.getFirstVisiblePosition();
     59         mListView.setAdapter(adapter);
     60         mListView.setSelection(index);
     61     }
     62 
     63     private static class MyArrayAdapter extends ArrayAdapter<EmojiRepo.EmojiData> {
     64         MyArrayAdapter(Context context, int resource, int textViewResourceId,
     65                 List<EmojiRepo.EmojiData> objects) {
     66             super(context, resource, textViewResourceId, objects);
     67         }
     68 
     69         @NonNull
     70         @Override
     71         public View getView(int position, View convertView, ViewGroup parent) {
     72             View view = super.getView(position, convertView, parent);
     73             ViewHolder holder = (ViewHolder) view.getTag();
     74             if (holder == null) {
     75                 holder = new ViewHolder();
     76                 holder.mEmojiTextView = view.findViewById(R.id.emoji);
     77                 holder.mTextView = view.findViewById(R.id.text);
     78             }
     79 
     80             EmojiRepo.EmojiData item = getItem(position);
     81             holder.mEmojiTextView.setText(item.getEmoji());
     82             holder.mTextView.setText(item.getCodepointString());
     83             holder.mTextView.setContentDescription(holder.mTextView.getText());
     84             return view;
     85         }
     86     }
     87 
     88     private static class ViewHolder {
     89         TextView mEmojiTextView;
     90         TextView mTextView;
     91     }
     92 
     93 }
     94