ListFragment.java revision f27b1ffc67228d73326ec3426fef4c9db75cd6fd 
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
17package com.example.android.support.text.emoji;
18
19import android.content.Context;
20import android.os.Bundle;
21import android.support.annotation.NonNull;
22import android.support.v4.app.Fragment;
23import android.view.LayoutInflater;
24import android.view.View;
25import android.view.ViewGroup;
26import android.widget.ArrayAdapter;
27import android.widget.ListView;
28import android.widget.TextView;
29
30import java.util.List;
31
32/**
33 * UI to list all supported emojis.
34 */
35
36public class ListFragment extends Fragment {
37
38    private ListView mListView;
39
40    static ListFragment newInstance() {
41        ListFragment fragment = new ListFragment();
42        return fragment;
43    }
44
45    @Override
46    public View onCreateView(LayoutInflater inflater, ViewGroup container,
47            Bundle savedInstanceState) {
48        final View view = inflater.inflate(R.layout.fragment_list, container, false);
49        mListView = view.findViewById(R.id.list);
50        loadList();
51        return view;
52    }
53
54    private void loadList() {
55        final ArrayAdapter<EmojiRepo.EmojiData> adapter = new MyArrayAdapter(getActivity(),
56                R.layout.list_item_emoji, R.id.text, EmojiRepo.getEmojis());
57        final int index = mListView.getFirstVisiblePosition();
58        mListView.setAdapter(adapter);
59        mListView.setSelection(index);
60    }
61
62    private static class MyArrayAdapter extends ArrayAdapter<EmojiRepo.EmojiData> {
63        MyArrayAdapter(Context context, int resource, int textViewResourceId,
64                List<EmojiRepo.EmojiData> objects) {
65            super(context, resource, textViewResourceId, objects);
66        }
67
68        @NonNull
69        @Override
70        public View getView(int position, View convertView, ViewGroup parent) {
71            View view = super.getView(position, convertView, parent);
72            ViewHolder holder = (ViewHolder) view.getTag();
73            if (holder == null) {
74                holder = new ViewHolder();
75                holder.mEmojiTextView = view.findViewById(R.id.emoji);
76                holder.mTextView = view.findViewById(R.id.text);
77            }
78
79            EmojiRepo.EmojiData item = getItem(position);
80            holder.mEmojiTextView.setText(item.getEmoji());
81            holder.mTextView.setText(item.getCodepointString());
82            holder.mTextView.setContentDescription(holder.mTextView.getText());
83            return view;
84        }
85    }
86
87    private static class ViewHolder {
88        TextView mEmojiTextView;
89        TextView mTextView;
90    }
91
92}
93