为什么 Android viewModels() 扩展函数在 fragment-ktx 而不是 viewmodel-ktx 库中可用？
Why is the Android viewModels() extension function available in the fragment-ktx instead of viewmodel-ktx library?
当我如下使用viewModels()时
class MainActivity : AppCompatActivity() {
private val viewModel: MainViewModel by viewModels()
// ... more codes
}
为什么它在
中可用
implementation 'androidx.fragment:fragment-ktx:1.3.0'
相反，当我包含如下内容时，它们不可用？
implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.0'
implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.0'
implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
我认为它应该在 viewmodel-ktx 库而不是 fragment-ktx 库
根据 the documentation, the by viewModels() extension is an extension on the Fragment class and therefore, must belong in the fragment-ktx artifact - the lifecycle-viewmodel-ktx and lifecycle-runtime-ktx do not have any dependency on fragments and the lifecycle-extensions artifact is completely deprecated and should not be used at all as per the Lifecycle 2.2.0 release notes.
当我如下使用viewModels()时
class MainActivity : AppCompatActivity() {
private val viewModel: MainViewModel by viewModels()
// ... more codes
}
为什么它在
中可用implementation 'androidx.fragment:fragment-ktx:1.3.0'
相反，当我包含如下内容时，它们不可用？
implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.0'
implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.0'
implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
我认为它应该在 viewmodel-ktx 库而不是 fragment-ktx 库
根据 the documentation, the by viewModels() extension is an extension on the Fragment class and therefore, must belong in the fragment-ktx artifact - the lifecycle-viewmodel-ktx and lifecycle-runtime-ktx do not have any dependency on fragments and the lifecycle-extensions artifact is completely deprecated and should not be used at all as per the Lifecycle 2.2.0 release notes.