当view.performLongClick()

Question

我有一个特殊的需要写一个测试如下：

@RunWith(RobolectricTestRunner.class)
public class LongClickTest {
    @Test
    public void testPerformLongClick() {
        View view = new View(Robolectric.application);
        view.performLongClick();
    }
}

但它给我带来了以下错误：

java.lang.NullPointerException
    at android.view.View.showContextMenu(View.java:4154)
    at android.view.View.performLongClick(View.java:4123)
    at org.robobinding.widget.view.OnLongClickAttributeTest.longClickOnView(OnLongClickAttributeTest.java:34)
    at org.robobinding.widget.view.OnLongClickAttributeTest.givenBoundAttribute_whenLongClickOnView_thenEventReceived(OnLongClickAttributeTest.java:27)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.robolectric.RobolectricTestRunner$2.evaluate(RobolectricTestRunner.java:250)
        ...

我检查了一个类似的测试，在org.robolectric.shadows.ViewTest.performLongClick_shouldClickOnView，本身，但我不知道为什么在罗波利克作品和我的没有。顺便说一下，我用的是Robolector2.3。

感谢你的帮助！

谢谢你，程

Answer 1

我正在测试上下文菜单。它是从listView的一行调用的。我就是这么做的(在科特林)：

    val activity = buildActivity(MyActivity::class.java).create().get()
    val customView = LayoutInflater.from(activity)
        .inflate(R.layout.custom_xml, activity.my_list_view, false)
        as MyCustomView

    val linearLayout = activity.my_list_view.parent as LinearLayout
    linearLayout.addView(customView)

现在，performClick工作了。我只需要学习如何获得de上下文菜单来测试这个！