Error: Attribute application@allowBackup value=(false) from AndroidManifest.xml:14:7-34 is also present at [:react-native-qq] AndroidManifest.xml:14:18-44 value=(true).

解决方法：

修改文件：

　　在manifest标签中添加   

xmlns:tools="http://schemas.android.com/tools"

　　在application标签中添加

tools:replace="android:allowBackup"