ListViewTest.java revision 1d3165f10b12165f02b7015ac1a817c5f60e6399 
1package android.widget;
2
3import com.google.android.collect.Lists;
4
5import junit.framework.Assert;
6
7import android.content.Context;
8import android.content.res.Resources;
9import android.test.InstrumentationTestCase;
10import android.test.mock.MockContext;
11import android.test.suitebuilder.annotation.MediumTest;
12import android.view.View;
13import android.view.ViewGroup;
14import android.widget.ArrayAdapter;
15import android.widget.ListView;
16
17import java.util.List;
18
19/**
20 * Copyright (C) 2007 The Android Open Source Project
21 *
22 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
23 * in compliance with the License. You may obtain a copy of the License at
24 *
25 * http://www.apache.org/licenses/LICENSE-2.0
26 *
27 * Unless required by applicable law or agreed to in writing, software distributed under the
28 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
29 * express or implied. See the License for the specific language governing permissions and
30 * limitations under the License.
31 */
32
33public class ListViewTest extends InstrumentationTestCase {
34
35    /**
36     * If a view in a ListView requests a layout it should be remeasured.
37     */
38    @MediumTest
39    public void testRequestLayout() throws Exception {
40        MockContext context = new MockContext2();
41        ListView listView = new ListView(context);
42        List<String> items = Lists.newArrayList("hello");
43        Adapter<String> adapter = new Adapter<String>(context, 0, items);
44        listView.setAdapter(adapter);
45
46        int measureSpec = View.MeasureSpec.makeMeasureSpec(100, View.MeasureSpec.EXACTLY);
47
48        adapter.notifyDataSetChanged();
49        listView.measure(measureSpec, measureSpec);
50        listView.layout(0, 0, 100, 100);
51
52        MockView childView = (MockView) listView.getChildAt(0);
53
54        childView.requestLayout();
55        childView.onMeasureCalled = false;
56        listView.measure(measureSpec, measureSpec);
57        listView.layout(0, 0, 100, 100);
58        Assert.assertTrue(childView.onMeasureCalled);
59    }
60
61    /**
62     * The list view should handle the disappearance of the only selected item, even when that item
63     * was selected before its disappearance.
64     *
65     */
66    @MediumTest
67    public void testNoSelectableItems() throws Exception {
68        MockContext context = new MockContext2();
69        ListView listView = new ListView(context);
70        // We use a header as the unselectable item to remain after the selectable one is removed.
71        listView.addHeaderView(new View(context), null, false);
72        List<String> items = Lists.newArrayList("hello");
73        Adapter<String> adapter = new Adapter<String>(context, 0, items);
74        listView.setAdapter(adapter);
75
76        listView.setSelection(1);
77
78        int measureSpec = View.MeasureSpec.makeMeasureSpec(100, View.MeasureSpec.EXACTLY);
79
80        adapter.notifyDataSetChanged();
81        listView.measure(measureSpec, measureSpec);
82        listView.layout(0, 0, 100, 100);
83
84        items.remove(0);
85
86        adapter.notifyDataSetChanged();
87        listView.measure(measureSpec, measureSpec);
88        listView.layout(0, 0, 100, 100);
89    }
90
91    private class MockContext2 extends MockContext {
92
93        @Override
94        public Resources getResources() {
95            return getInstrumentation().getTargetContext().getResources();
96        }
97
98        @Override
99        public Resources.Theme getTheme() {
100            return getInstrumentation().getTargetContext().getTheme();
101        }
102
103        @Override
104        public Object getSystemService(String name) {
105            if (Context.LAYOUT_INFLATER_SERVICE.equals(name)) {
106                return getInstrumentation().getTargetContext().getSystemService(name);
107            }
108            return super.getSystemService(name);
109        }
110    }
111
112    private class MockView extends View {
113
114        public boolean onMeasureCalled = false;
115
116        public MockView(Context context) {
117            super(context);
118        }
119
120        @Override
121        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
122            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
123            onMeasureCalled = true;
124        }
125    }
126
127    private class Adapter<T> extends ArrayAdapter<T> {
128
129        public Adapter(Context context, int resource, List<T> objects) {
130            super(context, resource, objects);
131        }
132
133        @Override
134        public View getView(int position, View convertView, ViewGroup parent) {
135            return new MockView(getContext());
136        }
137    }
138
139}
140