1/*
2 * Copyright (C) 2007 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 android.widget.listview;
18
19import com.android.frameworks.coretests.R;
20
21import android.app.ListActivity;
22import android.content.Context;
23import android.os.Bundle;
24import android.os.Handler;
25import android.view.View;
26import android.view.ViewGroup;
27import android.view.LayoutInflater;
28import android.widget.AdapterView;
29import android.widget.BaseAdapter;
30import android.widget.TextView;
31
32import java.util.Random;
33
34/**
35 * Exercises change notification in a list
36 */
37public class ListThrasher extends ListActivity implements AdapterView.OnItemSelectedListener {
38    Handler mHandler = new Handler();
39    ThrashListAdapter mAdapter;
40    Random mRandomizer = new Random();
41    TextView mText;
42
43    Runnable mThrash = new Runnable() {
44        public void run() {
45            mAdapter.bumpVersion();
46            mHandler.postDelayed(mThrash, 500);
47        }
48    };
49
50    private class ThrashListAdapter extends BaseAdapter {
51        private LayoutInflater mInflater;
52
53        /**
54         * Our data, part 1.
55         */
56        private String[] mTitles = new String[100];
57
58        /**
59         * Our data, part 2.
60         */
61        private int[] mVersion = new int[100];
62
63        public ThrashListAdapter(Context context) {
64            mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
65            mTitles = new String[100];
66            mVersion = new int[100];
67
68            int i;
69            for (i = 0; i < 100; i++) {
70                mTitles[i] = "[" + i + "]";
71                mVersion[i] = 0;
72            }
73        }
74
75        public int getCount() {
76            return mTitles.length;
77        }
78
79        public Object getItem(int position) {
80            return position;
81        }
82
83        public long getItemId(int position) {
84            return position;
85        }
86
87        public View getView(int position, View convertView, ViewGroup parent) {
88            TextView view;
89
90            if (convertView == null) {
91                view = (TextView) mInflater.inflate(android.R.layout.simple_list_item_1, null);
92            } else {
93                view = (TextView) convertView;
94            }
95            view.setText(mTitles[position] + " " + mVersion[position]);
96            return view;
97        }
98
99
100        public void bumpVersion() {
101            int position = mRandomizer.nextInt(getCount());
102            mVersion[position]++;
103            notifyDataSetChanged();
104        }
105
106
107    }
108
109    @Override
110    public void onCreate(Bundle icicle) {
111        super.onCreate(icicle);
112
113        setContentView(R.layout.list_thrasher);
114
115        mText = (TextView) findViewById(R.id.text);
116        mAdapter = new ThrashListAdapter(this);
117        setListAdapter(mAdapter);
118
119        mHandler.postDelayed(mThrash, 5000);
120
121        getListView().setOnItemSelectedListener(this);
122    }
123
124    public void onItemSelected(AdapterView parent, View v, int position, long id) {
125        mText.setText("Position " + position);
126    }
127
128    public void onNothingSelected(AdapterView parent) {
129        mText.setText("Nothing");
130    }
131}
132