Android使用DataBinding设置Visibility属性

Activity

binding.isLogin = UserManager.isLogin()通过binding将isLogin的值设置到xml中

    override fun onCreate(savedInstanceState: Bundle?) {
     
        super.onCreate(savedInstanceState)
        binding = DataBindingUtil.setContentView(this, R.layout.store_activity_about)
        binding.isLogin = UserManager.isLogin()
    }

XML

isLogin来接收登录状态

    <data>
        <variable
            name="isLogin"
            type="Boolean" />
        <import type="android.view.View" />
    data>

android:visibility="@{isLogin?View.VISIBLE:View.INVISIBLE}"
通过判断登录状态来确定是否显示View

        <TextView
            android:id="@+id/bt_logout"
            android:layout_width="263dp"
            android:layout_height="48dp"
            android:layout_marginBottom="77dp"
            android:background="@drawable/store_button_shape_orange_light"
            android:gravity="center"
            android:text="退出登录"
            android:textColor="#FFC01F"
            android:textSize="14sp"
            android:visibility="@{isLogin?View.VISIBLE:View.INVISIBLE}"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="@+id/view_bg"
            app:layout_constraintStart_toStartOf="@+id/view_bg" />

也可以直接将ViewModel传入到xml中

<layout 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">

    <data>

        <variable
            name="viewModel"
            type="com.store.ui.home.loginGuide.CouponGuideBottomViewModel" />

        <import type="android.view.View" />
    data>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/cl_content"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:background="#f2edf5ff"
        android:visibility="@{viewModel.hasCoupon?View.VISIBLE:View.GONE}"
        tools:context=".ui.home.loginGuide.LoginGuideBottomFragment"
        tools:visibility="visible">

        <TextView
            android:id="@+id/tv_button"
            android:layout_width="72dp"
            android:layout_height="36dp"
            android:layout_marginTop="6dp"
            android:layout_marginEnd="15dp"
            android:layout_marginBottom="6dp"
            android:background="@drawable/store_shape_corners_dp14"
            android:gravity="center"
            android:text="@{viewModel.buttonText}"
            android:textColor="@color/white"
            android:textSize="14sp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            tools:ignore="HardcodedText">

        TextView>

        <ImageView
            android:id="@+id/iv_close"
            android:layout_width="18dp"
            android:layout_height="18dp"
            android:layout_margin="10dp"
            android:src="@drawable/store_ic_close_blue"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            tools:ignore="ContentDescription" />

        <TextView
            android:id="@+id/tv_title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="10dp"
            android:text="@{viewModel.title}"
            android:textColor="#FF1C88FF"
            android:textSize="14sp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toEndOf="@id/iv_close"
            app:layout_constraintTop_toTopOf="parent"
            tools:ignore="HardcodedText" />

    androidx.constraintlayout.widget.ConstraintLayout>
layout>