"Android Development Learning" "Lesson Two" activity learning (1)

What is activity, is what we see

The following four sentences need to be understood:

1. An activity is a class, and the class needs to integrate activity;

2. Need to rewrite the Oncreat method

3. Each activity needs to be configured in Androidmanifest.xml

The XML is added to the <intent-filter> instructions to run the activity when the application starts

4. Add the necessary controls to the activity to generate the interface we want

The XML in the layout of the res is the layouts file

For example, this:

Code:

Effect: