数据绑定:找不到符号类BR [英] Data Binding: Cannot find symbol class BR

问题描述

我尝试在现有项目中使用数据绑定，但是无法构建它.

I try to use Data Binding in my existing project, but I can't get it to build.

在项目build.gradle中使用:

dependencies {
    classpath 'com.android.tools.build:gradle:1.3.1'
    //Data Binding Beta
    classpath "com.android.databinding:dataBinder:1.0-rc4"

    classpath 'com.neenbedankt.gradle.plugins:android-apt:1.7+'

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

申请

apply plugin: 'com.android.databinding'
apply plugin: 'com.neenbedankt.android-apt'`

和在模块中:

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])

    apt 'com.android.databinding:compiler:1.0-rc1+'
}

我试图将数据绑定与RecyclerView/Fragment/ViewHolder/Adapter一起使用. 我使用的是Android Studio 1.4.1. 使用compileSdkVersion 23和buildToolsVersion"23.0.1". 我没有合适的，不同的gradle版本，尝试过它，证明读过我的classs/xml. 我还使用Butterknife(因为我的项目太大，无法立即更改所有内容)和其他(但不相关)库. 我同步并重建了项目，关闭/打开了Android Studio，并尝试使缓存无效.我从头开始构建了一个新"示例，效果很好.

I tried to use Data Binding with RecyclerView/Fragment/ViewHolder/Adapter.. I use Android Studio 1.4.1. With compileSdkVersion 23 and buildToolsVersion "23.0.1". I tried it without apt, different gradle versions, proof read my classes/xml.. I also use still Butterknife(since my project is too big to change everything at once) and other (but unrelevant) libraries. I synced and rebuild my project, I closed/opened Android Studio, I tried to invalidate caches. I build a 'fresh' example from start, which worked fine.

我的数据类"中的getter方法是@Bindable.

My getter Methods in my "data class" are @Bindable.

此外，未创建数据绑定包. (错误消息说它不存在)和Error:cannot generate view binders java.lang.StringIndexOutOfBoundsException: String index out of range: -21

Also, the databinding package is not created. (error message says it doesn't exist) and Error:cannot generate view binders java.lang.StringIndexOutOfBoundsException: String index out of range: -21

推荐答案

几乎每次尝试将ObservableList与自定义对象一起使用时，都会出现Error:cannot generate view binders java.lang.StringIndexOutOfBoundsException: String index out of range: -21错误.但是我发现，几乎每次我键入文字后都忘记了>.傻我 因此，我的解决方案是进行检查:

I got the Error:cannot generate view binders java.lang.StringIndexOutOfBoundsException: String index out of range: -21 error almost everytime when I tried to use a ObservableList with custom objects. But I found out, that almost everytime I forgot a > after my type. Silly me. So, my solution was to check for it:

    <data>

        <import type="android.databinding.ObservableArrayList"/>

        <variable
            name="dices"
            type="ObservableArrayList&lt;Dice>" /> //don't forget the '>' after Dice
    </data>

这篇关于数据绑定:找不到符号类BR的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！