Manifest merger failed : Attribute application@allowBackup value=(true) from AndroidManifest.xml:18:9-35
is also present at :imsdk-plus-5.4.666: AndroidManifest.xml:16:9-36 value=(false).
Suggestion: add 'tools:replace="android:allowBackup"' to <application> element at AndroidManifest.xml:15:5-30:19 to override.
解决方法
清单文件application中新增下面两个属性
android:allowBackup="true"
tools:replace="allowBackup"