[英]How to Bind viewmodel to nested view in android
將我的StaffViewModel
數據綁定到具有DrawerLayout
和NavigationView
StaffActivity
視圖。 在那個NavigationView
有一個由員工姓名和電子郵件組成的布局nav_header_staf
。 我如何將我的視圖模型綁定到該nav_header_staff
以替換員工姓名和電子郵件
我試圖在activity_staff
和nav_header_staff
布局中的兩個布局中綁定視圖模型,但databinding
不起作用。
這是我在 StaffActivity.kt 中嘗試過的
class StaffActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelectedListener, AnkoLogger {
private var fragmentManager: FragmentManager = supportFragmentManager
private lateinit var drawerLayout: DrawerLayout
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
//Create View Model
val staffBundle = intent.getBundleExtra(StaffModel.NAME)
val staff = staffBundle.getSerializable(StaffModel.NAME) as StaffModel
//Create databinding
val staffViewModel = StaffViewModel(staff)
val binding = DataBindingUtil.setContentView<ViewDataBinding>(this, R.layout.activity_staff)
binding!!.setVariable(BR.staff, staffViewModel)
val toolbar: Toolbar = toolbar
setSupportActionBar(toolbar)
val fab: FloatingActionButton = fab
fab.setOnClickListener { view ->
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show()
}
drawerLayout = drawer_layout
val navView: NavigationView = nav_view
val toggle = ActionBarDrawerToggle(
this, drawerLayout, toolbar,
R.string.navigation_drawer_open,
R.string.navigation_drawer_close
)
drawerLayout.addDrawerListener(toggle)
toggle.syncState()
navView.setNavigationItemSelectedListener(this)
}
這是 activity_staff.xml 布局
<layout>
<data xmlns:android="http://schemas.android.com/apk/res/android">
<variable name="staff" type="id.code.sakilarentaldvd.viewModel.StaffViewModel"/>
</data>
<androidx.drawerlayout.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<include
layout="@layout/app_bar_staff"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<com.google.android.material.navigation.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="@layout/nav_header_staff"
app:menu="@menu/activity_staff_drawer"/>
</androidx.drawerlayout.widget.DrawerLayout>
</layout>
這是 nav_header_staff.xml 布局
<?xml version="1.0" encoding="utf-8"?>
<layout>
<data xmlns:android="http://schemas.android.com/apk/res/android">
<variable name="staff" type="id.code.sakilarentaldvd.viewModel.StaffViewModel"/>
</data>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:id="@+id/staffHeader"
android:layout_height="@dimen/nav_header_height"
xmlns:tools="http://schemas.android.com/tools"
android:background="@drawable/side_nav_bar"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:theme="@style/ThemeOverlay.AppCompat.Dark"
android:orientation="vertical"
android:gravity="bottom">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="@dimen/nav_header_vertical_spacing"
app:srcCompat="@mipmap/ic_launcher_round"
android:contentDescription="@string/nav_header_desc"
android:id="@+id/imageView"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="@dimen/nav_header_vertical_spacing"
tools:text="username"
android:text="@{staff.staffName}"
android:textAppearance="@style/TextAppearance.AppCompat.Body1"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
tools:text="blabla@sakila.org"
android:text="@{staff.email}"
android:id="@+id/textView"/>
</LinearLayout>
</layout>
這是結果的作用
謝謝stackoverflow,我知道我錯過了什么,這是我的解決方案
我在StaffActivity.kt
變化
class StaffActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelectedListener, AnkoLogger {
private var fragmentManager: FragmentManager = supportFragmentManager
private lateinit var drawerLayout: DrawerLayout
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
//Create View Model
val staffBundle = intent.getBundleExtra(StaffModel.NAME)
val staff = staffBundle.getSerializable(StaffModel.NAME) as StaffModel
//Create databinding
val staffViewModel = StaffViewModel(staff)
//remove binding because no need to link view model with this layout
setContentView(R.layout.activity_staff) // setActivityLayout
...
// I override this object method
val toggle =object: ActionBarDrawerToggle(
this, drawerLayout, toolbar,
R.string.navigation_drawer_open,
R.string.navigation_drawer_close
){// do binding in this method
override fun onDrawerStateChanged(newState: Int) {
val binding2 = DataBindingUtil.bind<NavHeaderStaffBinding>(findViewById(R.id.staffHeader))
binding2!!.staff= staffViewModel
super.onDrawerStateChanged(newState)
}
}
drawerLayout.addDrawerListener(toggle)
toggle.syncState()
navView.setNavigationItemSelectedListener(this)
}
通過刪除<layout>
和<data>
標簽,我對activity_staff.xml
布局做了一些更改
<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<include
layout="@layout/app_bar_staff"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<com.google.android.material.navigation.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="@layout/nav_header_staff"
app:menu="@menu/activity_staff_drawer"/>
</androidx.drawerlayout.widget.DrawerLayout>
所以這是結果
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