Android数据绑定(bind)依赖与支持库冲突

Question

我正在尝试在我的 Android 项目中设置数据绑定(bind)，如下所示:

dataBinding {
    enabled = true
}

但是，当我添加支持库依赖项时，lint 提示:

All com.android.support libraries must use the exact same version specification (mixing versions can lead to runtime crashes). Found versions 25.1.0, 21.0.3. Examples include 'com.android.support:animated-vector-drawable:25.1.0' and 'com.android.support:support-v4:21.0.3'

当我运行 ./gradlew app:dependencies 时，我得到以下信息:

...
+--- com.android.support:appcompat-v7:25.1.0
|    +--- com.android.support:support-annotations:25.1.0
|    +--- com.android.support:support-v4:25.1.0
|    |    +--- com.android.support:support-compat:25.1.0 (*)
|    |    +--- com.android.support:support-media-compat:25.1.0
|    |    |    +--- com.android.support:support-annotations:25.1.0
|    |    |    \--- com.android.support:support-compat:25.1.0 (*)
|    |    +--- com.android.support:support-core-utils:25.1.0
|    |    |    +--- com.android.support:support-annotations:25.1.0
|    |    |    \--- com.android.support:support-compat:25.1.0 (*)
|    |    +--- com.android.support:support-core-ui:25.1.0 (*)
|    |    \--- com.android.support:support-fragment:25.1.0
|    |         +--- com.android.support:support-compat:25.1.0 (*)
|    |         +--- com.android.support:support-media-compat:25.1.0 (*)
|    |         +--- com.android.support:support-core-ui:25.1.0 (*)
|    |         \--- com.android.support:support-core-utils:25.1.0 (*)
|    +--- com.android.support:support-vector-drawable:25.1.0
|    |    +--- com.android.support:support-annotations:25.1.0
|    |    \--- com.android.support:support-compat:25.1.0 (*)
|    \--- com.android.support:animated-vector-drawable:25.1.0
|         \--- com.android.support:support-vector-drawable:25.1.0 (*)
+--- com.android.databinding:library:1.3.1
|    +--- com.android.support:support-v4:21.0.3 -> 25.1.0 (*)
|    \--- com.android.databinding:baseLibrary:2.3.0-dev -> 2.3.0-beta1
...

关于如何在不禁用链接的情况下阻止链接提示的任何想法？

Answer 1

为此记录了一个缺陷，这导致了更有用的错误消息:https://issuetracker.google.com/issues/37128971

解决方案是在 build.gradle 中为您正在使用的支持库版本添加对 support-v4 的显式依赖，因此如果您使用的是支持库 25.1.0:

compile 'com.android.support:support-v4:25.1.0'

正如@gopalanrc 建议的那样，从 Android Gradle 插件 3.0.0 开始，您通常应该改用以下内容:

implementation 'com.android.support:support-v4:25.1.0'