android 活动间进行数据传递

Main ->Next

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val intent = Intent(this,NextActivity::class.java)
        intent.putExtra("data","123")
        startActivity(intent)
    }
}

class NextActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_next)
        val data = intent.getStringExtra("data")
    }
}