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ListWithOffScreenNextSelectableTest.javaAPI DocAndroid 5.1 API4504Thu Mar 12 22:22:12 GMT 2015android.widget.listview.arrowscroll

ListWithOffScreenNextSelectableTest

public class ListWithOffScreenNextSelectableTest extends android.test.ActivityInstrumentationTestCase

Fields Summary
private android.widget.ListView
mListView
Constructors Summary
public ListWithOffScreenNextSelectableTest()

        super("com.android.frameworks.coretests", ListWithOffScreenNextSelectable.class);
Methods Summary
protected voidsetUp()

        super.setUp();

        mListView = getActivity().getListView();
public voidtestGoDownToOffScreenSelectable()


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

        final View lastVisibleView = mListView.getChildAt(mListView.getChildCount() - 1);
        sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);
        assertEquals("expecting view to be panned to just above fading edge",
                listBottom - mListView.getVerticalFadingEdgeLength(), lastVisibleView.getBottom());
        assertEquals("selection should not have moved yet",
                0, mListView.getSelectedItemPosition());
        
        sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);
        assertEquals("selection should have moved",
                4, mListView.getSelectedItemPosition());
        assertEquals("wrong view created when scrolling",
                getActivity().getValueAtPosition(4), ((TextView) mListView.getSelectedView()).getText());
        assertEquals(listBottom, mListView.getSelectedView().getBottom());
public voidtestGoUpToOffScreenSelectable()

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

        sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);
        sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);

        assertEquals(4, mListView.getSelectedItemPosition());
        assertEquals(listBottom, mListView.getSelectedView().getBottom());

        // now we have the reverse situation: the next selectable position upward is off screen
        final View firstVisibleView = mListView.getChildAt(0);
        sendKeys(KeyEvent.KEYCODE_DPAD_UP);
        assertEquals("should have panned top view just below vertical fading edge",
                listTop + mListView.getVerticalFadingEdgeLength(), firstVisibleView.getTop());
        assertEquals("selection should not have moved yet",
                4, mListView.getSelectedItemPosition());

        sendKeys(KeyEvent.KEYCODE_DPAD_UP);
        assertEquals("selection should have moved",
                0, mListView.getSelectedItemPosition());
        assertEquals(getActivity().getValueAtPosition(0),((TextView) mListView.getSelectedView()).getText());
        assertEquals(listTop, mListView.getSelectedView().getTop());
public voidtestPreconditions()

        assertNotNull(mListView);
        assertEquals(5, mListView.getAdapter().getCount());
        assertFalse(mListView.getAdapter().areAllItemsEnabled());
        assertFalse(mListView.getAdapter().isEnabled(1));
        assertFalse(mListView.getAdapter().isEnabled(2));
        assertFalse(mListView.getAdapter().isEnabled(3));
        assertEquals("only 4 children should be on screen (so that next selectable is off " +
                "screen) for this test to be meaningful.",
                4, mListView.getChildCount());
        assertEquals(0, mListView.getSelectedItemPosition());