As是beginTransaction.replace (; 方法被错误地修正了
需要的是:
fragmentmanagerfragmentmanager=getfragmentmanager (; fragmenttransactionbegintransaction=fragment manager.begin transaction (; 修改如下:
androidx.fragment.app.fragmentmanagerfragmentmanager=getsupportfragmentmanager (; androidx.fragment.app.fragmenttransactionbegintransaction=fragment manager.begin transaction (;