Android example source code file (ListViewTest.java)

This example Android source code file (ListViewTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

adapter, android, arrayadapter, content, exception, google, instrumentationtestcase, listview, listviewtest, mediumtest, mockcontext2, mockview, object, override, resources, test, ui, view, viewgroup, widget

The ListViewTest.java Android example source code

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.widget;

import com.google.android.collect.Lists;

import junit.framework.Assert;

import android.content.Context;
import android.content.res.Resources;
import android.test.InstrumentationTestCase;
import android.test.mock.MockContext;
import android.test.suitebuilder.annotation.MediumTest;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import java.util.List;

public class ListViewTest extends InstrumentationTestCase {

    /**
     * If a view in a ListView requests a layout it should be remeasured.
     */
    @MediumTest
    public void testRequestLayout() throws Exception {
        MockContext context = new MockContext2();
        ListView listView = new ListView(context);
        List<String> items = Lists.newArrayList("hello");
        Adapter<String> adapter = new Adapter(context, 0, items);
        listView.setAdapter(adapter);

        int measureSpec = View.MeasureSpec.makeMeasureSpec(100, View.MeasureSpec.EXACTLY);

        adapter.notifyDataSetChanged();
        listView.measure(measureSpec, measureSpec);
        listView.layout(0, 0, 100, 100);

        MockView childView = (MockView) listView.getChildAt(0);

        childView.requestLayout();
        childView.onMeasureCalled = false;
        listView.measure(measureSpec, measureSpec);
        listView.layout(0, 0, 100, 100);
        Assert.assertTrue(childView.onMeasureCalled);
    }

    /**
     * The list view should handle the disappearance of the only selected item, even when that item
     * was selected before its disappearance.
     *
     */
    @MediumTest
    public void testNoSelectableItems() throws Exception {
        MockContext context = new MockContext2();
        ListView listView = new ListView(context);
        // We use a header as the unselectable item to remain after the selectable one is removed.
        listView.addHeaderView(new View(context), null, false);
        List<String> items = Lists.newArrayList("hello");
        Adapter<String> adapter = new Adapter(context, 0, items);
        listView.setAdapter(adapter);

        listView.setSelection(1);

        int measureSpec = View.MeasureSpec.makeMeasureSpec(100, View.MeasureSpec.EXACTLY);

        adapter.notifyDataSetChanged();
        listView.measure(measureSpec, measureSpec);
        listView.layout(0, 0, 100, 100);

        items.remove(0);

        adapter.notifyDataSetChanged();
        listView.measure(measureSpec, measureSpec);
        listView.layout(0, 0, 100, 100);
    }

    private class MockContext2 extends MockContext {

        @Override
        public Resources getResources() {
            return getInstrumentation().getTargetContext().getResources();
        }

        @Override
        public Resources.Theme getTheme() {
            return getInstrumentation().getTargetContext().getTheme();
        }

        @Override
        public Object getSystemService(String name) {
            if (Context.LAYOUT_INFLATER_SERVICE.equals(name)) {
                return getInstrumentation().getTargetContext().getSystemService(name);
            }
            return super.getSystemService(name);
        }
    }
    
    private class MockView extends View {

        public boolean onMeasureCalled = false;

        public MockView(Context context) {
            super(context);
        }

        @Override
        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
            onMeasureCalled = true;
        }
    }

    private class Adapter<T> extends ArrayAdapter {

        public Adapter(Context context, int resource, List<T> objects) {
            super(context, resource, objects);
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            return new MockView(getContext());
        }
    }

}