我看了几个例子,但是它们要么抽象太多,要么教程过时。我想以最小的方式实现此功能。在这里,我需要使用User
作为Navigational体系结构中的参数传递的UserForm类的帮助。
模块化应用程序build.gradle ,我已添加
android {
...
dataBinding {
enabled = true
}
}
用户类
@Parcelize
data class User(var first: String, var last: String): Parcelable
FormFragment.kt
class UserForm: Fragment() {
private val user by lazy {
arguments?.getParcelable("user") ?: User("John", "Doe")
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
}
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
return inflater.inflate(R.layout.fragment_form, container, false)
}
}
fragment_form.xml
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<data>
<variable name="user" type="data.User" />
</data>
<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">
<EditText
android:id="@+id/first"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="text"
android:text="@{user.first}" />
<EditText
android:id="@+id/last"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="text"
android:text="@{user.last}" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
一些摘要
答案 0 :(得分:1)
在下面修改您的代码:
FormFragment.kt
class UserForm: Fragment() {
private val user by lazy {
arguments?.getParcelable("user") ?: User("John", "Doe")
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
}
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val binding = FragmentFormBinding.inflate(inflater, container, false).apply {
user = this@UserForm.user
}
return binding.root
}
}
说明:
由于您在fragment_form.xml中使用了DataBinding,因此将自动生成相应的FragmentFormBinding类
我们通常使用XxxBinding.inflate代替inflater.inflate(layoutid,container,false)
在FragmentFormBinding.inflate之后,我们将用户对象绑定到fragment_form.xml