有没有办法使用 espresso 进行 android Instrumentation 测试来测试视图的大小（高度和宽度）？

Question

我想检查adFrame单击后更改的可见性和大小是否发生变化buttonShow

onView(withId(buttonShow)).perform(click());
onView(withId(adFrame)).check(matches(isDisplayed()));
onView(withId(adFrame)).check(?);

我正在寻找这个问题的解决方案？。

adFrame我们是否有一个断言可以测试使用 espresso 进行此Android Instrumentation 测试的大小？

Answer 1

给定以下匹配器：

class WidthMatcher(private val width: Int = ViewGroup.LayoutParams.MATCH_PARENT) : TypeSafeMatcher<View>() {
    companion object {
        fun withWidth(width: Int) = WidthMatcher(width)
    }

    override fun describeTo(description: Description?) {
        description?.appendText("View with width: ${width}px")
    }

    override fun matchesSafely(item: View): Boolean {
        return item.layoutParams?.width == width
    }
}

class HeightMatcher(private val height: Int = ViewGroup.LayoutParams.MATCH_PARENT) : TypeSafeMatcher<View>() {
    companion object {
        fun withHeight(height: Int) = HeightMatcher(height)
    }

    override fun describeTo(description: Description?) {
        description?.appendText("View with height: ${height}px")
    }

    override fun matchesSafely(item: View): Boolean {
        return item.layoutParams?.height == height
    }
}

您只需检查如下：

onView(withId(adFrame)).check(matches(withHeight(ViewGroup.LayoutParams.MATCH_PARENT)))

您还可以检查任何尺寸（以 px 为单位）。您可以使用以下方法从 dp 转换为 px：

/**
 * Converts dp unit to its equivalent in pixels, based on device density.
 *
 * @param dp The value in dp (density independent pixels) unit aim to convert into pixels
 * @return The equivalent int value in px of the provided dp value depending on device density
 */
fun dpToPx(dp: Int): Int {
    (dp * Resources.getSystem().displayMetrics.density).roundToInt()
}

/**
 * This method converts device specific pixels to density independent pixels.
 *
 * @param px A value in px (pixels) unit. Which we need to convert into db
 * @return The equivalent int value in dp of the provided px value depending on device density
 */
fun pxToDp(px: Int): Int {
    (px / Resources.getSystem().displayMetrics.density).roundToInt()
}