Error:Execution failed for task ':app:processDebugManifest'. > Manifest merger failed : Attribute meta-data#android.support.VERSION@value value=(25.3.1) from [com.android.support:design:25.3.1] AndroidManifest.xml:27:9-31 is also present at [com.android.support:appcompat-v7:26.0.0-alpha1] AndroidManifest.xml:27:9-38 value=(26.0.0-alpha1). Suggestion: add 'tools:replace="android:value"' to <meta-data> element at AndroidManifest.xml:25:5-27:34 to override.
问题解决：
com.android.support:design:25.3.1版本不对，最好是降低版本，高版本兼容性差
