Error:Execution failed for task ':app:processDebugManifest'.
> Manifest merger failed : Attribute meta-data#android.support.VERSION@value value=(25.3.0) from [com.android.support:design:25.3.0] AndroidManifest.xml:27:9-31
is also present at [com.android.support:support-vector-drawable:25.3.1] AndroidManifest.xml:24:9-31 value=(25.3.1).
Suggestion: add 'tools:replace="android:value"' to <meta-data> element at AndroidManifest.xml:25:5-27:34 to override.
解决：
在 app 目录下的 build.gradle 中，修改 com.android.support 库的版本号一致，如：
修改前：
