[英]Styling issue when using FragmentScenario
When using FragmentScenario
from androidx.fragment:fragment-testing
to test fragment UI, not all styles are applied correctly.使用
androidx.fragment:fragment-testing
中的FragmentScenario
测试片段 UI 时,并非所有 styles 都正确应用。
As an example, there's very simple application that just presents fragment with following layout:例如,有一个非常简单的应用程序,它只显示具有以下布局的片段:
fragment_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="8dp">
<TextView
android:id="@+id/textView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Hello World!"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
with default theme generated by Android Studio (4.1.2) that looks like this when running the app:由 Android Studio (4.1.2) 生成的默认主题在运行应用程序时如下所示:
doesn't look the same when run as a FragmentScenario
test:作为
FragmentScenario
测试运行时看起来不一样:
I can understand that ActionBar
is not shown (as it is a part of host Activity
not a Fragment
).我可以理解
ActionBar
没有显示(因为它是主机Activity
的一部分而不是Fragment
)。 But why Button
is not styled correctly ...??但是为什么
Button
的样式不正确...??
As others have commented FragmentScenario
will launch your Fragment
in a EmptyFragmentActivity
(defined within the FragmentScenario
class) by default this uses the R.style.FragmentScenarioEmptyFragmentActivityTheme
.正如其他人评论的那样,默认情况下,
FragmentScenario
将在EmptyFragmentActivity
(在FragmentScenario
类中定义)中启动您的Fragment
,这使用R.style.FragmentScenarioEmptyFragmentActivityTheme
。
To ensure our tests use the correct theme we supply our theme Theme_App
to the themeResId
param (as well as any Arguments) and it renders correctly.为了确保我们的测试使用正确的主题,我们将主题
Theme_App
提供给themeResId
参数(以及任何参数)并正确呈现。
val scenario: FragmentScenario<MyFragment> = launchFragmentInContainer(
themeResId = style.Theme_App,
fragmentArgs = args
)
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