在Android中使用数据绑定错误：包*。*。databinding不存在 [英] Using data-binding in android error: package *.*.databinding does not exist

问题描述

我正在尝试在android应用中实现数据绑定。 这是我要设置的链接。即使在完成所有必要的实现后，我在gradle-build中也收到以下错误：

I'm trying to implement data-binding in android app. This is the link I'm following to set it up. Even after doing all the necessary implements, I'm getting the following error in gradle-build:

错误：包com.example.satpracticeapp .databinding不存在。

error: package com.example.satpracticeapp.databinding does not exist.

（此包是我在MainActivity.java文件中导入的包）
我尝试了此（数据绑定编译器），但没有成功。

(This package is what I'm importing in my MainActivity.java file) I tried this (the data-binding compiler), but it didn't work.

问题是我已经成功尝试了使用数据绑定的hello-world应用程序，并且可以正常工作。但是，当我尝试在几周前制作的应用程序中实现它时，出现了上面提到的错误。在寻找解决方案时，我将gradle文件从成功的hello world应用程序复制粘贴到了我的旧应用程序-仍然无法解决问题。

The problem is I've already successfully tried a hello-world app using data-binding and it works. But, when I try to implement it in an app I made a few weeks ago, I get the error I mentioned above. Searching for the solutions, I copy-pasted the gradle files from my successful hello world app to my old app - that too didn't work out.

这是我的应用程序level build.gradle

Here is my app level build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        applicationId "com.example.satpracticeapp"
        minSdkVersion 16
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    dataBinding {
        enabled = true
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:23.1.1'
    compile 'com.android.support:design:23.1.0'
}

这是项目级别build.gradle文件的buildscript：

And here's the buildscript of the project level build.gradle file:

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.5.0'
    }
}

以下是三个文件的最低版本的链接（如果需要）

Here are the links to the minimal version of the three files (if it's needed)

1. MainActivity.java


2. ViewModel.java


3. activity_main.xml

1. MainActivity.java
2. ViewModel.java
3. activity_main.xml

经过大量的头发拔除后，我无法弄清解决方案并得到相同的构建错误一次又一次。
因此，作为一个临时解决方案，我正在尝试将我的类和布局复制粘贴到正在使用的hello world项目中。我错过了什么？

After much hair-pulling, I couldn't figure out the solution and getting the same build error again and again. So, as a temporary solution, I'm trying to copy-paste my classes and layouts in the working hello world project. What am I missing?

编辑：

搜索后，我回到了代码。逐字检查它，并在xml文件中的绑定变量的名称中发现了键入错误。
现在一切正常！

After a few hours of pointless searching, I went back to my code. Checked it word by word and found a typing mistake at the name of a binding variable in the xml file. Everything works fine now!

推荐答案

我遇到了同样的问题，原来是一个重复的符号声明我的* .java类。它显示在Gradle控制台中，但有点隐藏在数据绑定错误中。我大约有72个数据绑定错误，并且这个重复的符号错误在中间，所以很容易错过。

I had the same issue, turned out to be a duplicate symbol declaration in one of my *.java classes. It's shown in the Gradle console but it was kinda hidden among the databinding errors. i had about 72 data binding errors and this duplicate symbol error was in the middle so it's easy to miss.

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