Simple message transfer
send Message
val it3 = Intent(this, LearnActivity2::class.java)
it3.putExtra("msg1", "message")
it3.putExtra("msg2", 100)
startActivity(it3)
Receive information
val it2 = intent
val msg1 = it2.getStringExtra("msg1")
val msg2 = it2.getIntExtra("msg2", 0)
Transfer object
Need to serialize the object
import java.io.Serializable
class Student(var name: String, var age: Int, var gender: String) : Serializable
send Message
val it3 = Intent(this, LearnActivity2::class.java)
val s = Student("zhangsan", 22, "male")
it3.putExtra("stu", s)
startActivity(it3)
Receive information
val stu = it.getSerializableExtra("stu") as Student?