Activity Basic

Activity传递参数

Activity参数传递

button1.setOnClickListener {
    val content = "Frequency of failures"
    val intent = Intent(this, SecondActivity::class.java)
    intent.putExtra("extra_data", content)
    startActivity(intent)
}

Activity接收参数

val extraData = intent.getStringExtra("extra_data")

返回数据给上一个Activity

button2.setOnClickListener {    
    val intent = Intent()
    intent.putExtra("data_return", "My brother is afraid of dogs")
    setResult(RESULT_OK, intent)
    finish()
}