浓咖啡:选择后为什么纺纱厂不关门?

我有一个关于在Spinners with Espresso中选择商品的问题。 或者更确切地说:选择有效,但之后视图断言失败,因为微调器仍处于打开状态。

假设我有一个非常简单的活动,其中包含一个微调器和一个显示选择的textview,如下所示:

简单的微调器布局

现在,我写了一个Espresso测试,选择’狗’并validationtextview是否相应更新:

@Test public void selectDogs() throws Exception { onData(allOf(is(instanceOf(String.class)), is("dogs"))) .inAdapterView(withId(R.id.spinner)) .perform(click()); onView(withId(R.id.selected)).check(matches(withText("dogs"))); } 

该测试失败,因为onData()...perform(click()); 没有关闭旋转器,它只是让它打开。 通过调试validation:

选择微调器后

例外是:

 android.support.test.espresso.NoMatchingViewException: No views in hierarchy found matching: with id: org.flinc.app:id/selected If the target view is not part of the view hierarchy, you may need to use Espresso.onData to load it from one of the following AdapterViews:android.widget.ListPopupWindow$DropDownListView{226cb88 VFED.VC.. .F...... 0,0-231,432} 

我可以(通过在微调器选择后添加pressBack() )来修复我的测试,但对我来说这不是正确的解决方案。 它也会在模拟器上出现问题,但它似乎在我的设备上正常运行。 如何在微调器中正确选择然后关闭它?

非常感谢您的帮助!

以下是活动代码供参考:

 @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.test_spinner); Spinner spinner = (Spinner) findViewById(R.id.spinner); final TextView selected = (TextView) findViewById(R.id.selected); final List items = Arrays.asList("cats", "dogs", "unicorns"); final ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_spinner_item, items); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinner.setAdapter(adapter); spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView parent, View view, int position, long id) { selected.setText(items.get(position)); } @Override public void onNothingSelected(AdapterView parent) { selected.setText(""); } }); } 

您必须先单击微调器,使用以下代码:

 @Test public void selectDogs() throws Exception { onView(withId(R.id.spinner)).perform(click()); onData(allOf(is(instanceOf(String.class)), is("dogs"))) .perform(click()); onView(withId(R.id.selected)).check(matches(withText("dogs"))); }