viewBinding不显示模型数据

Question

Android Studio 2.6

app / build.gradle：

android {
    viewBinding {
        enabled = true 
    }
    dataBinding {
        enabled = true
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    compileSdkVersion 29

这里是我的布局：add_profile_activity.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"
    xmlns:tools="http://schemas.android.com/tools">

    <data>

        <variable
            name="item"
            type="com.android.testproject.android.kotlin.viewbinding.model.MyModel" />
    </data>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <include
            android:id="@+id/toolBarContainer"
            layout="@layout/tool_bar"
            android:title='@{@string/view_binding}'
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <TextView
            android:id="@+id/text_title"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_margin="@dimen/default_margin"
            android:gravity="center"
            android:text="@{item.email}"
            android:textColor="@android:color/black"
            android:textSize="18sp"
            app:layout_constraintBottom_toTopOf="@+id/button_add_profile"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/toolBarContainer" />


        <Button
            android:id="@+id/button_add_profile"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="24dp"
            android:padding="16dp"
            android:text="@string/button"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent" />
    </androidx.constraintlayout.widget.ConstraintLayout>
</layout>

我的活动：

import android.os.Bundle
import android.util.Log
import androidx.appcompat.app.AppCompatActivity
import com.android.testproject.android.kotlin.BR
import com.android.testproject.android.kotlin.R
import com.android.testproject.android.kotlin.databinding.AddProfileActivityBinding
import com.android.testproject.android.kotlin.viewbinding.model.MyModel
import java.util.*
class MyTestViewBindingActivity : AppCompatActivity() {
    private lateinit var viewBinding: AddProfileActivityBinding // use "add_profile_activity.xml"

    private val TAG = MyTestViewBindingActivity::class.java.name

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        // init viewbinding
        viewBinding = AddProfileActivityBinding.inflate(layoutInflater)
        setContentView(viewBinding.root)

        init()
    }

    private fun init() {
        val myModel = createStubModel()
        Log.d(TAG, "init: myModel = $myModel")
        viewBinding.setVariable(BR.item, myModel)
        viewBinding.executePendingBindings(); //binding must be executed immediately

        viewBinding.textTitle.text = getString(R.string.some_string)
        initLogic()
    }

    private fun initLogic() {
        viewBinding.buttonAddProfile.setOnClickListener {
            Log.d(TAG, "viewBinding: click_button")
        }
    }

    private fun createStubModel(): MyModel {
        val myModel = MyModel("Alex", "[email protected]")
        myModel.paidDate = Date()
        return myModel
    }


}

在活动中，我像这样设置模型：

viewBinding.setVariable(BR.item, myModel)

并且在xml中，我使用android:text="@{item.email}"从myModel打印值。

当我在logcat中启动应用程序时，我看到下一个文本：

init: myModel = MyModel(id=0, name=Alex, [email protected], paidDate=Sun Dec 22 12:48:27 GMT+02:00 2019)

但是在屏幕上没有显示[email protected]

这里结果：

它打印“ 代码中的某些字符串”

为什么不打印[email protected]？

Answer 1

您尝试过以下内容吗？

viewBinding = DataBindingUtil.setContentView(this, R.layout.add_profile_activity)