使用Robolectric测试ListView

Question

我目前正在尝试使用Robolectric测试一些Android代码,但我的ListView存在一些问题.当我尝试访问子视图时,由于列表为空,ListView始终返回null.

应用程序的实现如下所示,并创建一个简单的列表视图:

private ListView listView;
private ArrayAdapter<String> adapter;
private static String values[] = 
        new String[] {"Android", "Apple", "Windows" };

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_overview);

    initialize();
}

private void initialize() {
    listView = (ListView) findViewById(R.id.tweet_list);

    adapter = new ArrayAdapter<String>(
            getApplicationContext(), 
            android.R.layout.simple_list_item_1, 
            values);

    listView.setAdapter(adapter);
}

但是,当我尝试访问我的ListView时,如下所示.当我通过getChildAt()访问ArrayAdapter时,Robolectric TestRunner始终返回null

private OverviewActivity activity;
private ListView listView;

@Before
public void setUp() throws Exception {
    activity = new OverviewActivity();      
    activity.onCreate(null);

    listView = (ListView) activity.findViewById(R.id.tweet_list);
}

@Test
public void shouldFindListView() throws Exception {     
    if (listView.getChildCount() > 0) {
        assertThat(
                "Android",
                equalTo(listView.getChildAt(0).toString()));
    } else {
        fail("no child views are avaliable");
    }
}

Answer 1

如果有人喜欢我,仍然访问链接以解决如何使用Roboelectric 3.0测试listview.这是我的MAinActivityTest文件

private MainActivity mainActivity;
private ListView lstView;

@Before
public void setup() throws Exception{
    mainActivity= Robolectric.setupActivity(MainActivity.class);
    assertNotNull("Mainactivity not intsantiated",mainActivity);
    lstView=(ListView)mainActivity.findViewById(R.id.list);//getting the list layout xml
    ShadowLog.stream = System.out; //This is for printing log messages in console
}

@Test
public void shouldFindListView()throws Exception{
    assertNotNull("ListView not found ", lstView);
    ShadowListView shadowListView = Shadows.shadowOf(lstView); //we need to shadow the list view

    shadowListView.populateItems();// will populate the adapter
    ShadowLog.d("Checking the first country name in adapter " ,
        ((RowModel)lstView.getAdapter().getItem(0)).getCountry());

    assertTrue("Country Japan doesnt exist", "Japan".equals(((RowModel) lstView.getAdapter().getItem(0)).getCountry()));
    assertTrue(3==lstView.getChildCount());
}

RowModel是要在listview中显示的字段的简单POJO.