android - Android Studio 项目不会为 Main Activity 生成绑定对象

问题描述

我参加了 Udacity 课程来学习使用 Kotlin 开发 Android 应用程序，在此期间多次使用数据绑定并且启用它没有问题，但是现在，尝试设置我的第一个项目时，我遇到了一些问题：Android Studio 没有t 找到对 MainActivityBinding 的引用。

C:\Dev\Projects\Android_Studio\myproject\app\src\main\java\com\guglielmoboi\myproject\MainActivity.kt: (8, 35): Unresolved reference: MainActivityBinding

这些是我制作的文件：

build.gradle（项目）

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
   ext {
       kotlin_version = "1.4.32"
   }

   repositories {
       google()
       jcenter()
   }

   dependencies {
       classpath "com.android.tools.build:gradle:4.1.3"
       classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

       // NOTE: Do not place your application dependencies here; they belong
       // in the individual module build.gradle files
   }
}

allprojects {
   repositories {
       google()
       jcenter()
   }
}

build.gradle (:app)

plugins {
   id 'com.android.application'
   id 'kotlin-android'
   id 'kotlin-kapt'
}

android {
   compileSdkVersion 30
   buildToolsVersion "30.0.3"

   defaultConfig {
       applicationId "com.guglielmoboi.myproject"
       minSdkVersion 26
       targetSdkVersion 30
       versionCode 1
       versionName "1.0"

       testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
   }

   buildTypes {
       release {
           minifyEnabled false
           proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
       }
   }

   **buildFeatures {
       dataBinding true
       viewBinding true
   }**

   compileOptions {
       sourceCompatibility JavaVersion.VERSION_1_8
       targetCompatibility JavaVersion.VERSION_1_8
   }

   kotlinOptions {
       jvmTarget = '1.8'
   }

}

dependencies {
   /* Room dependencies */
   def room_version = "2.3.0"

   implementation "androidx.room:room-runtime:$room_version"
   kapt "androidx.room:room-compiler:$room_version"

   // optional - Kotlin Extensions and Coroutines support for Room
   implementation "androidx.room:room-ktx:$room_version"

   // optional - Test helpers
   testImplementation "androidx.room:room-testing:$room_version"


   /* Navigation dependencies */
   def nav_version = "2.3.5"

   // Java language implementation
   implementation "androidx.navigation:navigation-fragment-ktx:$nav_version"
   implementation "androidx.navigation:navigation-ui-ktx:$nav_version"

   // Kotlin
   implementation "androidx.navigation:navigation-fragment-ktx:$nav_version"
   implementation "androidx.navigation:navigation-ui-ktx:$nav_version"

   // Feature module Support
   implementation "androidx.navigation:navigation-dynamic-features-fragment:$nav_version"

   // Testing Navigation
   androidTestImplementation "androidx.navigation:navigation-testing:$nav_version"

   // Jetpack Compose Integration
   implementation "androidx.navigation:navigation-compose:1.0.0-alpha10"


   implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
   implementation 'androidx.core:core-ktx:1.3.2'
   implementation 'androidx.appcompat:appcompat:1.2.0'
   implementation 'com.google.android.material:material:1.3.0'
   implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
   testImplementation 'junit:junit:4.13.2'
   androidTestImplementation 'androidx.test.ext:junit:1.1.2'
   androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}

activity_main.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>

    </data>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">
    </androidx.constraintlayout.widget.ConstraintLayout>

</layout>

MainActivity.kt

package com.guglielmoboi.myproject

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle

class MainActivity : AppCompatActivity()
{
    private lateinit var binding: MainActivityBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }
}

标签： androidkotlinandroid-activitydata-bindingandroid-databinding

android - Android Studio 项目不会为 Main Activity 生成绑定对象

问题描述

解决方案

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