Android example source code file (ListOfThinItemsTest.java)

This example Android source code file (ListOfThinItemsTest.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

activityinstrumentationtestcase, android, exception, largetest, listofthinitemstest, listview, mediumtest, override, string, test, ui, view, widget

The ListOfThinItemsTest.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.listview.arrowscroll;

import android.test.ActivityInstrumentationTestCase;
import android.test.suitebuilder.annotation.LargeTest;
import android.test.suitebuilder.annotation.MediumTest;
import android.view.KeyEvent;
import android.view.View;
import android.widget.ListView;
import android.widget.listview.ListOfThinItems;

public class ListOfThinItemsTest extends ActivityInstrumentationTestCase<ListOfThinItems> {
    private ListView mListView;

    public ListOfThinItemsTest() {
        super("com.android.frameworks.coretests", ListOfThinItems.class);
    }

    @Override
    protected void setUp() throws Exception{
        super.setUp();
        mListView = getActivity().getListView();
    }

    @MediumTest
    public void testPreconditions() {
        assertNotNull(mListView);
        assertTrue("need item height less than fading edge length",
                mListView.getSelectedView().getHeight() < mListView.getVerticalFadingEdgeLength());
        assertTrue("need items off screen",
                mListView.getChildCount() < mListView.getAdapter().getCount());
    }

    @LargeTest
    public void testScrollToBottom() {
        final int numItems = mListView.getAdapter().getCount();
        final int listBottom = mListView.getHeight() - mListView.getListPaddingBottom();
        for (int i = 0; i < numItems; i++) {
            assertEquals("wrong selection at position " + i,
                    i, mListView.getSelectedItemPosition());
            final int bottomFadingEdge = listBottom - mListView.getVerticalFadingEdgeLength();
            final View lastChild = mListView.getChildAt(mListView.getChildCount() - 1);
            final int lastVisiblePosition = lastChild.getId();


            int bottomThreshold = (lastVisiblePosition < mListView.getAdapter().getCount() - 1) ?
                    bottomFadingEdge : listBottom;

            String prefix = "after " + i + " down presses, ";

            assertTrue(prefix + "selected item is below bottom threshold (fading edge or bottom as " +
                    "appropriate)",
                    mListView.getSelectedView().getBottom() <= bottomThreshold);
            assertTrue(prefix + "first item in list must be at very top or just above",
                    mListView.getChildAt(0).getTop() <= 0);
            assertTrue(prefix + "last item in list should be at very bottom or just below",
                    lastChild.getBottom() >= listBottom);
            sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);
        }
    }

    @LargeTest
    public void testScrollToTop() {
        final int numItems = mListView.getAdapter().getCount();

        for (int i = 0; i < numItems - 1; i++) {
            sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);
        }
        assertEquals("should have moved to last position",
                numItems - 1, mListView.getSelectedItemPosition());

        int listTop = mListView.getListPaddingTop();
        final int listBottom = mListView.getHeight() - mListView.getListPaddingBottom();

        for (int i = 0; i < numItems; i++) {
            int expectedPostion = numItems - (i + 1);
            assertEquals("wrong selection at position " + expectedPostion,
                    expectedPostion, mListView.getSelectedItemPosition());
            final int topFadingEdge = listTop + mListView.getVerticalFadingEdgeLength();
            final View firstChild = mListView.getChildAt(0);
            final View lastChild = mListView.getChildAt(mListView.getChildCount() - 1);
            final int firstVisiblePosition = firstChild.getId();


            int topThreshold = (firstVisiblePosition > 0) ?
                    topFadingEdge : listTop;

            String prefix = "after " + i + " up presses, ";

            assertTrue(prefix + "selected item is above top threshold (fading edge or top as " +
                    "appropriate)",
                    mListView.getSelectedView().getTop() >= topThreshold);
            assertTrue(prefix + "first item in list must be at very top or just above",
                    firstChild.getTop() <= 0);
            assertTrue(prefix + "last item in list should be at very bottom or just below",
                    lastChild.getBottom() >= listBottom);
            sendKeys(KeyEvent.KEYCODE_DPAD_UP);
        }
    }
}