如何将值从活动传递到Kotlin中的另一个活动 [英] How to pass the values from activity to another activity in kotlin

问题描述

在学习Kotlin进行Android开发时，我现在正在尝试诸如hello world之类的基本程序，以及如何从一个活动导航到另一个活动，这没有问题.

As I'm learning Kotlin for Android development, I'm now trying the basic programs like hello world and how to navigate from one activity to another activity , there is no issue in this.

我担心的是，当我从一个活动转移到另一个活动时，它工作正常，但是我不知道如何在活动之间传递值.

My concern is when I move from one activity to another activity it works fine but I do not know how to pass the values between the activities.

我很累在一个活动中设置值，而在另一个活动中却无法使用.

I tired to set the values in one activity and retrieved in another activity it does not work.

请参见下面的代码段

这是我的主要活动，我从编辑文本中获取用户名和密码并将其设置为意图:

This is my main activity where I take the username and password from edit text and setting to the intent:

class MainActivity : AppCompatActivity() {
    val userName = null
    val password = null
    override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    button.setOnClickListener {
        val intent = Intent(this@MainActivity,SecondActivity::class.java);
        var userName = username.textø
        var password = password_field.text
        intent.putExtra("Username", userName)
        intent.putExtra("Password", password)
        startActivity(intent);
    }
}

}

这是我的第二项活动，我必须从主要活动中接收值

This is my second activity where I have to receive values from the main activity

class SecondActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_second)
        var strUser: String = intent.getStringExtra("Username")
        var strPassword: String = intent.getStringExtra("Password")
        user_name.setText("Seelan")
        passwor_print.setText("Seelan")

    }
}

如果我不是故意的话，请问我是否有其他方法可以在Kotlin中做到这一点.

Please guide me how to do this, whether if I have some other way to do this in Kotlin if not by intent.

推荐答案

从HomeActivity发送值

Send value from HomeActivity

val intent = Intent(this@HomeActivity,ProfileActivity::class.java)
intent.putExtra("Username","John Doe")
startActivity(intent)

在ProfileActivity中获取值

Get values in ProfileActivity

val profileName=intent.getStringExtra("Username")

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