Android study notes | 3.2 programmatic access to Android controls

This article is from the study notes on "Mr. Jin's Computer Self-study Website" , and it is strongly recommended! The content is very good. You can learn if you need it~

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table of Contents

1. Activity overview

2. Layout overview​​​​​​

Three, Activity and layout files

4. Resources in the project 

Five, findViewById alternative

Six, summary

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1. Activity overview

2. Layout overview

Three, Activity and layout files

It is recommended not to modify the base class of activity to prevent the display effect of different versions from being different.

Associating activities and layouts: use setContentView() in the activity code

The control elements in the layout all have corresponding view objects~

The efficiency of fingViewById is not high~ If you need to call on a large scale in the project, you need to optimize it yourself...

There are two ways to hook a control to an activity:

1. Add a listener to the control object directly in the activity code

2. In the xml file, add the onclick attribute to the corresponding control (declarative)

Get the reference of the corresponding control object through findViewById, but you can also directly use the id value of the control as the reference of the object in Kotlin !

4. Resources in the project 

Five, findViewById alternative

Six, summary