Error: Program type already present: android.support.v4.app.FragmentTransitionCompat21$1

版权声明：感谢来访！欢迎指导、勘误、讨论及转载，转载请注明出处 https://blog.csdn.net/u011489043/article/details/84967118

参考链接

https://stackoverflow.com/questions/52845161/error-program-type-already-present-android-support-v4-app-fragmenttransitionco

主要原因：

gradle 文件没有导入 support v4 包

implementation 'com.android.support:appcompat-v7:28.0.0'
// 添加下面这句即可
implementation 'com.android.support:support-v4:28.0.0'