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      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 
     17 package android.widget;
     18 
     19 import com.google.android.collect.Lists;
     20 
     21 import junit.framework.Assert;
     22 
     23 import android.content.Context;
     24 import android.content.res.Resources;
     25 import android.test.InstrumentationTestCase;
     26 import android.test.mock.MockContext;
     27 import android.test.suitebuilder.annotation.MediumTest;
     28 import android.view.View;
     29 import android.view.ViewGroup;
     30 import android.widget.ArrayAdapter;
     31 import android.widget.ListView;
     32 
     33 import java.util.List;
     34 
     35 public class ListViewTest extends InstrumentationTestCase {
     36 
     37     /**
     38      * If a view in a ListView requests a layout it should be remeasured.
     39      */
     40     @MediumTest
     41     public void testRequestLayout() throws Exception {
     42         MockContext context = new MockContext2();
     43         ListView listView = new ListView(context);
     44         List<String> items = Lists.newArrayList("hello");
     45         Adapter<String> adapter = new Adapter<String>(context, 0, items);
     46         listView.setAdapter(adapter);
     47 
     48         int measureSpec = View.MeasureSpec.makeMeasureSpec(100, View.MeasureSpec.EXACTLY);
     49 
     50         adapter.notifyDataSetChanged();
     51         listView.measure(measureSpec, measureSpec);
     52         listView.layout(0, 0, 100, 100);
     53 
     54         MockView childView = (MockView) listView.getChildAt(0);
     55 
     56         childView.requestLayout();
     57         childView.onMeasureCalled = false;
     58         listView.measure(measureSpec, measureSpec);
     59         listView.layout(0, 0, 100, 100);
     60         Assert.assertTrue(childView.onMeasureCalled);
     61     }
     62 
     63     /**
     64      * The list view should handle the disappearance of the only selected item, even when that item
     65      * was selected before its disappearance.
     66      *
     67      */
     68     @MediumTest
     69     public void testNoSelectableItems() throws Exception {
     70         MockContext context = new MockContext2();
     71         ListView listView = new ListView(context);
     72         // We use a header as the unselectable item to remain after the selectable one is removed.
     73         listView.addHeaderView(new View(context), null, false);
     74         List<String> items = Lists.newArrayList("hello");
     75         Adapter<String> adapter = new Adapter<String>(context, 0, items);
     76         listView.setAdapter(adapter);
     77 
     78         listView.setSelection(1);
     79 
     80         int measureSpec = View.MeasureSpec.makeMeasureSpec(100, View.MeasureSpec.EXACTLY);
     81 
     82         adapter.notifyDataSetChanged();
     83         listView.measure(measureSpec, measureSpec);
     84         listView.layout(0, 0, 100, 100);
     85 
     86         items.remove(0);
     87 
     88         adapter.notifyDataSetChanged();
     89         listView.measure(measureSpec, measureSpec);
     90         listView.layout(0, 0, 100, 100);
     91     }
     92 
     93     private class MockContext2 extends MockContext {
     94 
     95         @Override
     96         public Resources getResources() {
     97             return getInstrumentation().getTargetContext().getResources();
     98         }
     99 
    100         @Override
    101         public Resources.Theme getTheme() {
    102             return getInstrumentation().getTargetContext().getTheme();
    103         }
    104 
    105         @Override
    106         public Object getSystemService(String name) {
    107             if (Context.LAYOUT_INFLATER_SERVICE.equals(name)) {
    108                 return getInstrumentation().getTargetContext().getSystemService(name);
    109             }
    110             return super.getSystemService(name);
    111         }
    112     }
    113 
    114     private class MockView extends View {
    115 
    116         public boolean onMeasureCalled = false;
    117 
    118         public MockView(Context context) {
    119             super(context);
    120         }
    121 
    122         @Override
    123         protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    124             super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    125             onMeasureCalled = true;
    126         }
    127     }
    128 
    129     private class Adapter<T> extends ArrayAdapter<T> {
    130 
    131         public Adapter(Context context, int resource, List<T> objects) {
    132             super(context, resource, objects);
    133         }
    134 
    135         @Override
    136         public View getView(int position, View convertView, ViewGroup parent) {
    137             return new MockView(getContext());
    138         }
    139     }
    140 
    141 }
    142