【Android开发】Activity的信息传递

简单信息传递

发送信息

val it3 = Intent(this, LearnActivity2::class.java)
it3.putExtra("msg1", "message")
it3.putExtra("msg2", 100)
startActivity(it3)

接受信息

val it2 = intent
val msg1 = it2.getStringExtra("msg1")
val msg2 = it2.getIntExtra("msg2", 0)

传递对象

需要将对象序列化

import java.io.Serializable
class Student(var name: String, var age: Int, var gender: String) : Serializable

发送信息

   val it3 = Intent(this, LearnActivity2::class.java)
   val s = Student("zhangsan", 22, "male")
   it3.putExtra("stu", s)

   startActivity(it3)

接受信息

	val stu = it.getSerializableExtra("stu") as Student?