Miscellaneous learning

1. channel , What are the ？

channel , Is used to package the project .
To put it bluntly , Just different app stores , Yes app There are different requirements ,build Variants Is to package projects for different app stores . Like Google App store , Huawei app store , Yes app The requirements for putting on the shelf are different . Then you need to package the projects separately as they want , To get on the shelves .
Set channel , stay Build Variants Inside , There is one Official edition , It's the official channel , That is to say app The version on the official website , There are no restrictions on this , It's up to the company to decide .

Channels can also be used to carry information , For example, different types of mobile phones , Statistics for operation and maintenance students

2.Dialog

seeing the name of a thing one thinks of its function .“ dialogue ”, A window will pop up , Prompt the user to choose , To prompt , Some content to classify
I recommend learning this article

3.ButterKnife frame

seeing the name of a thing one thinks of its function ,“ Butter knife ”, You can bind a View, Economical use findViewById. You can also bind buttons OnClick Method
I recommend learning this article

4.Fragment Of show and hide Method

hide(Fragment fragment) ： Hide an existing Fragment
show(Fragment fragment) ： A previously hidden one Fragment
It is highly recommended to study this article ！！