Android example source code file (ListWithOffScreenNextSelectableTest.java)

This example Android source code file (ListWithOffScreenNextSelectableTest.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, listview, listwithoffscreennextselectabletest, mediumtest, override, test, textview, ui, view, widget

The ListWithOffScreenNextSelectableTest.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.ListWithOffScreenNextSelectable;

public class ListWithOffScreenNextSelectableTest
        extends ActivityInstrumentationTestCase<ListWithOffScreenNextSelectable> {
    private ListView mListView;

    public ListWithOffScreenNextSelectableTest() {
        super("com.android.frameworks.coretests", ListWithOffScreenNextSelectable.class);
    }

    @Override
    protected void setUp() throws Exception {
        super.setUp();

        mListView = getActivity().getListView();
    }

    @MediumTest
    public void testPreconditions() {
        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());
    }

    // when the next items on screen are not selectable, we pan until the next selectable item
    // is (partially visible), then we jump to it
    @MediumTest
    public void testGoDownToOffScreenSelectable() {

        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());
    }

    @MediumTest
    public void testGoUpToOffScreenSelectable() {
        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());

    }

}