Android DataBinding类未生成求助：迁移findViewById示例遇阻

Hey there, let's get your DataBinding class generated properly. I spotted several issues in your configuration and layout that are causing the problem. Here's how to fix them step by step:

1. Fix Root build.gradle Dependencies #

Your root build script has conflicting and outdated dependencies that break DataBinding support:

• You've included two versions of the Android Gradle Plugin (3.0.1 and 1.3.0) — this will cause version conflicts. Stick to the newer one.
• The old com.android.databinding:dataBinder dependency is obsolete. Starting with Android Gradle Plugin 3.0+, DataBinding is integrated directly into the core plugin, so you don't need this separate classpath entry.

Here's the corrected root build.gradle:

buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
        // Removed duplicate Gradle plugin and obsolete dataBinder dependency
    }
}

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

task clean(type: Delete) {
    delete rootProject.buildDir
}

2. Enable DataBinding in Module-level build.gradle #

You're missing the critical step of enabling DataBinding in your app module's build file. Open your app/build.gradle and add this inside the android block:

android {
    // ... other existing config (compileSdkVersion, defaultConfig, etc.)
    
    dataBinding {
        enabled = true
    }
}

3. Fix Layout File Syntax Errors #

Your layout has two syntax issues that prevent the binding class from being generated:

• The <variable> tag isn't properly closed (missing / at the end).
• You've duplicated the tools namespace declaration in the root <layout> and inner <LinearLayout> tags — remove the duplicate.

Here's the corrected layout:

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools">
    <data class="SudokuBinding">
        <variable name="user" type="com.example.flash.sudoku.Sudoku" />
    </data>
    <LinearLayout xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/background"
        android:orientation="horizontal"
        android:padding="30dip"
        tools:context="com.example.flash.sudoku.Sudoku">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:orientation="vertical">
            <TextView
                android:id="@+id/textView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="25dip"
                android:gravity="center"
                android:text="@string/main_title"
                android:textSize="24.5sp" />
            <Button
                android:id="@+id/continue_button"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="@string/continue_label" />
            <Button
                android:id="@+id/new_button"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="@string/new_game_label" />
            <Button
                android:id="@+id/about_button"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="@string/about_label" />
            <Button
                android:id="@+id/exit_button"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="@string/exit_label" />
        </LinearLayout>
    </LinearLayout>
</layout>

4. Clean and Rebuild Your Project #

After making all these changes:

• Go to Build > Clean Project to clear old build artifacts.
• Then run Build > Rebuild Project to trigger the DataBinding class generation.

Once the rebuild finishes, you should be able to access the SudokuBinding class in your Activity code.

内容的提问来源于stack exchange，提问作者Tom Magaro