我正在尝试测试位于NestedScrollView中的表单中的EditTexts。我正在运行以下代码:
onView(withId(R.id.register_scroll_view)).perform(scrollTo()).perform(click());
其中register_scroll_view是我的NestedScrollView。 但是，我收到了一个异常：
android.support.test.espresso.PerformException：在视图“具有id：com.eazyigz.myapp：id / register_scroll_view”的滚动上执行错误。 造成原因：由于目标视图不符合以下一个或多个约束条件，操作将不会执行： （视图的有效可见性= VISIBLE，并且是a的后代：（可分配给类：class android.widget.ScrollView或可分配给类：class android.widget.HorizontalScrollView））
如何正确设计此测试以使需要滚动才能变为可见的EditTexts被测试？
我没有使用过 NestedScrollView，但它似乎支持与普通 ScrollView 相同的 requestRectangleOnScreen() 滚动方式。
唯一的问题是 ScrollView 的限制已经硬编码到 scrollTo() 操作中，而 NestedScrollView 并未继承普通 ScrollView。
我认为这里唯一的解决方案是将整个 ScrollToAction 类复制并粘贴到您自己的实现中，并替换掉烦人的限制。
我已经编写了一个ViewAction，用于处理NestedScrollView的子视图滚动。它还考虑到了CoordinatorLayout可能是根布局的情况 - 所以您不必担心工具栏会改变其大小。
以下是一些代码。您需要将此类复制粘贴到项目的某个位置。然后，您可以像这样使用它：
onView(withId(R.id.register_scroll_view))
.perform(CustomScrollActions.nestedScrollTo, click());
重要提示：它不能替代scrollTo()方法，而是另一种ScrollView滚动视图操作，适用于处理NestedScrollView的情况。
所以我说的就是一个ViewAction：
public class CustomScrollActions {
public static ViewAction nestedScrollTo() {
return new ViewAction() {
@Override
public Matcher<View> getConstraints() {
return Matchers.allOf(
isDescendantOfA(isAssignableFrom(NestedScrollView.class)),
withEffectiveVisibility(ViewMatchers.Visibility.VISIBLE));
}
@Override
public String getDescription() {
return "Find parent with type " + NestedScrollView.class +
" of matched view and programmatically scroll to it.";
}
@Override
public void perform(UiController uiController, View view) {
try {
NestedScrollView nestedScrollView = (NestedScrollView)
findFirstParentLayoutOfClass(view, NestedScrollView.class);
if (nestedScrollView != null) {
CoordinatorLayout coordinatorLayout =
(CoordinatorLayout) findFirstParentLayoutOfClass(view, CoordinatorLayout.class);
if (coordinatorLayout != null) {
CollapsingToolbarLayout collapsingToolbarLayout =
findCollapsingToolbarLayoutChildIn(coordinatorLayout);
if (collapsingToolbarLayout != null) {
int toolbarHeight = collapsingToolbarLayout.getHeight();
nestedScrollView.startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL);
nestedScrollView.dispatchNestedPreScroll(0, toolbarHeight, null, null);
}
}
nestedScrollView.scrollTo(0, view.getTop());
} else {
throw new Exception("Unable to find NestedScrollView parent.");
}
} catch (Exception e) {
throw new PerformException.Builder()
.withActionDescription(this.getDescription())
.withViewDescription(HumanReadables.describe(view))
.withCause(e)
.build();
}
uiController.loopMainThreadUntilIdle();
}
};
}
private static CollapsingToolbarLayout findCollapsingToolbarLayoutChildIn(ViewGroup viewGroup) {
for (int i = 0; i < viewGroup.getChildCount(); i++) {
View child = viewGroup.getChildAt(i);
if (child instanceof CollapsingToolbarLayout) {
return (CollapsingToolbarLayout) child;
} else if (child instanceof ViewGroup) {
return findCollapsingToolbarLayoutChildIn((ViewGroup) child);
}
}
return null;
}
private static View findFirstParentLayoutOfClass(View view, Class<? extends View> parentClass) {
ViewParent parent = new FrameLayout(view.getContext());
ViewParent incrementView = null;
int i = 0;
while (parent != null && !(parent.getClass() == parentClass)) {
if (i == 0) {
parent = findParent(view);
} else {
parent = findParent(incrementView);
}
incrementView = parent;
i++;
}
return (View) parent;
}
private static ViewParent findParent(View view) {
return view.getParent();
}
private static ViewParent findParent(ViewParent view) {
return view.getParent();
}
}
使用
onView(withId(R.id.register_scroll_view))
.perform(swipeUp(), click())
onView(withId(R.id. register_scroll_view)).perform(swipeUp()) 应该就足够了 :) - Ryan Amaralimport android.view.View
import android.view.ViewParent
import androidx.core.view.get
import androidx.core.widget.NestedScrollView
import androidx.test.espresso.PerformException
import androidx.test.espresso.UiController
import androidx.test.espresso.ViewAction
import androidx.test.espresso.matcher.ViewMatchers.*
import androidx.test.espresso.util.HumanReadables
import org.hamcrest.Matcher
import org.hamcrest.Matchers
object CustomActions {
const val TOP_X = 0
fun nestedScrollTo(): ViewAction {
return object : ViewAction {
override fun getConstraints(): Matcher<View> {
return Matchers.allOf(
isDescendantOfA(isAssignableFrom(NestedScrollView::class.java)),
withEffectiveVisibility(Visibility.VISIBLE)
)
}
override fun getDescription(): String {
return "Find parent with type " + NestedScrollView::class.java +
" of matched view and programmatically scroll to it."
}
override fun perform(uiController: UiController, view: View) {
try {
findParentOrNull<NestedScrollView>(view) ?: throw Exception("Unable to find NestedScrollView parent.")
} catch (e: Exception) {
throw PerformException.Builder()
.withActionDescription(description)
.withViewDescription(HumanReadables.describe(view))
.withCause(e)
.build()
}
uiController.loopMainThreadUntilIdle()
}
}
}
private inline fun <reified T> findFirstParentOrNull(view: View): T? {
var parent: ViewParent? = null
var incrementView: ViewParent? = null
var isMatchInitialParent = false
while (parent?.javaClass != T::class.java) {
parent = if (isMatchInitialParent.not()) {
isMatchInitialParent = true
view.parent
} else {
incrementView?.parent
}
incrementView = parent
}
return parent as? T
}
}
swipeUp()而不是scrollTo()。 - Wahib Ul Haq