问来自柯特林的GradientDrawable的GetColor
EN

Stack Overflow用户

提问于 2020-05-11 22:48:57

回答 1查看 289关注 0票数 0

我已经像这样通过编程设置了一个GradientDrawable背景，并尝试测试它的颜色。主要问题似乎是在测试时从形状(GradientDrawable)获取颜色。

此代码片段来自较大的绑定适配器。

color = ContextCompat.getColor(
    textView.context, R.color.ColorRatingHigh
)

val shape = GradientDrawable()
shape.shape = GradientDrawable.OVAL
shape.setColor(color)
shape.setStroke(2, Color.BLACK)
textView.setBackground(shape)

测试是这样设置的。

@Test
fun MovieDetailRatingColorTest() {
    ...

    onView(withId(R.id.movie_vote_average))
        .check(matches(withBackgroundColor(R.color.ColorRatingHigh)))
}
...

fun withBackgroundColor(expectedColor: Int): Matcher<View?>? {
    Checks.checkNotNull(expectedColor)
    return object : BoundedMatcher<View?, TextView>(TextView::class.java) {
        override fun matchesSafely(textView: TextView): Boolean {

            val actualColor = (textView.getBackground() as ColorDrawable).color
            return expectedColor == actualColor
        }

        override fun describeTo(description: Description) {
            description.appendText("with background color: ")
        }
    }
}

不幸的是，我得到了以下ClassCastException

android.graphics.drawable.GradientDrawable cannot be cast to android.graphics.drawable.ColorDrawable

我在网站上看到了一些关于类似问题的帖子，

但是似乎没有一个是有效的，并且大多数都以同样的问题结束。例如Testing background color espresso Android

或者答案似乎过时了，或者受到java到kotlin转换的影响..例如how to get the color from GradientDrawable

unit-testing

kotlin

gradientdrawable

回答 1

Stack Overflow用户

回答已采纳

发布于 2020-05-12 12:28:56

我想出了一个解决办法，使用片段方案来访问“ContextCompat”。

这允许我检索'R.color‘目录。getColor检索最初传入的colorId的2的补码...它恰好与这里检索到的id相匹配：val actualColor = (textView.getBackground() as ColorDrawable).color.defaultColor

lateinit var scenario: FragmentScenario<MovieDetailFragment>
...

@Test
fun MovieDetailRatingColorTest() {
    var expectedColor: Int? = 0

    scenario.onFragment { fragment ->
            expectedColor =
                fragment.context?.let {
                    ContextCompat.getColor(it, R.color.ColorRatingHigh )
                }
    }

    onView(withId(R.id.movie_vote_average))
        .check(matches(withBackgroundColor(expectedColor)))
}

然后，我编辑了withBackground()函数以匹配新输入

fun withBackgroundColor(expectedColor: Int?): Matcher<View?>? {
    Checks.checkNotNull(expectedColor)
    return object : BoundedMatcher<View?, TextView>(TextView::class.java) {
        override fun matchesSafely(textView: TextView): Boolean {

            val actualColor = (textView.getBackground() as GradientDrawable).color?.defaultColor
            return expectedColor == actualColor
        }

        override fun describeTo(description: Description) {
            description.appendText("with background color: $expectedColor")
        }
    }
}