Android example source code file (ListOfItemsShorterThanScreenTest.java)

This example Android source code file (ListOfItemsShorterThanScreenTest.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, listofitemsshorterthanscreentest, listview, mediumtest, test, textview, ui, view, widget

The ListOfItemsShorterThanScreenTest.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.MediumTest;
import android.view.KeyEvent;
import android.view.View;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.listview.ListOfItemsShorterThanScreen;

public class ListOfItemsShorterThanScreenTest
        extends ActivityInstrumentationTestCase<ListOfItemsShorterThanScreen> {
    private ListView mListView;
    private ListOfItemsShorterThanScreen mActivity;


    public ListOfItemsShorterThanScreenTest() {
        super("com.android.frameworks.coretests", ListOfItemsShorterThanScreen.class);
    }

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

    @MediumTest
    public void testPreconditions() {
        assertEquals(0, mListView.getSelectedItemPosition());
        assertTrue(mListView.getChildAt(0).isSelected());
        assertEquals(mListView.getListPaddingTop(), mListView.getSelectedView().getTop());
    }

    @MediumTest
    public void testMoveDownToOnScreenNextItem() {
        final View next = mListView.getChildAt(1);
        assertFalse(next.isSelected());
        final int secondPosition = mListView.getSelectedView().getBottom();
        assertEquals("second item should be positioned item height pixels from top.",
                secondPosition,
                next.getTop());

        sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);
        assertEquals(1, mListView.getSelectedItemPosition());
        assertTrue(next.isSelected());
        assertEquals("next selected item shouldn't have moved",
                secondPosition,
                next.getTop());
    }

    @MediumTest
    public void testMoveUpToOnScreenItem() {
        // move down one, then back up
        sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);
        sendKeys(KeyEvent.KEYCODE_DPAD_UP);
        assertEquals(0, mListView.getSelectedItemPosition());
    }

    @MediumTest
    public void testMoveDownToItemRequiringScrolling() {
        final int lastOnScreenItemIndex = mListView.getChildCount() - 1;
        final View lastItem = mListView.getChildAt(lastOnScreenItemIndex);
        assertTrue("last item should be partially off screen",
                lastItem.getBottom() > mListView.getBottom());
        assertEquals(mListView.getListPaddingTop(), mListView.getSelectedView().getTop());

        for (int i = 0; i < lastOnScreenItemIndex; i++) {
            sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);
        }

        assertEquals(lastOnScreenItemIndex, mListView.getSelectedItemPosition());
        assertEquals(
                getTopOfBottomFadingEdge(),
                mListView.getSelectedView().getBottom());

        // there should be a peeking view

        // the current view isn't the last anymore...
        assertEquals(mListView.getSelectedView(), mListView.getChildAt(mListView.getChildCount() - 2));

        // peeking view is now last
        final TextView view = (TextView) mListView.getChildAt(mListView.getChildCount() - 1);
        assertEquals(mActivity.getValueAtPosition(lastOnScreenItemIndex + 1), view.getText());
        assertFalse(view.isSelected());
    }

    @MediumTest
    public void testMoveUpToItemRequiringScrolling() {
        // go down to one past last item, then back up to the second item.  this will
        // require scrolling to get it back on screen, and will need a peeking edge

        int numItemsOnScreen = mListView.getChildCount();
        for (int i = 0; i < numItemsOnScreen; i++) {
            sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);
        }
        for (int i = 0; i < numItemsOnScreen - 1; i++) {
            sendKeys(KeyEvent.KEYCODE_DPAD_UP);
        }

        assertEquals(1, mListView.getSelectedItemPosition());
        assertEquals("top should be just below vertical fading edge",
                mListView.getVerticalFadingEdgeLength() + mListView.getListPaddingTop(),
                mListView.getSelectedView().getTop());
    }

    @MediumTest
    public void testPressUpWhenAlreadyAtTop() {
        sendKeys(KeyEvent.KEYCODE_DPAD_UP);

        assertEquals(0, mListView.getSelectedItemPosition());
    }

    @MediumTest
    public void testPressDownWhenAlreadyAtBottom() {
        final int lastItemPosition = mListView.getAdapter().getCount() - 1;
        for (int i = 0; i < lastItemPosition; i++) {
            sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);
        }
        assertEquals(lastItemPosition, mListView.getSelectedItemPosition());

        sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);
        assertEquals(lastItemPosition, mListView.getSelectedItemPosition());
    }

    @MediumTest
    public void testNoVerticalFadingEdgeWhenMovingToBottom() {
        final int lastItemPosition = mListView.getAdapter().getCount() - 1;
        for (int i = 0; i < lastItemPosition; i++) {
            sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);
        }
        assertEquals(lastItemPosition, mListView.getSelectedItemPosition());

        assertEquals("bottom of last item should be just above padding; no fading edge.",
                mListView.getHeight() - mListView.getListPaddingBottom(),
                mListView.getSelectedView().getBottom());

    }

    // the top of the bottom fading edge takes into account the list padding at the bottom,
    // and the fading edge size
    private int getTopOfBottomFadingEdge() {
        return mListView.getHeight() - (mListView.getVerticalFadingEdgeLength() + mListView.getListPaddingBottom());
    }


}