Front end developers must read! Starting from scratch, teach you to build a low code website platform in stages>>> 
Getsupportfragmentmanager(). Begintransaction(). Add error cannot resolve method ‘Add’
It’s the problem of guiding packages. All packages should be consistent. If there are packages under the app, we should ensure that they are all packages under the app
Ensure that all V4 packets are V4 packets
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