kotlin项目中从一个Activity跳转到另一个Activity，并传递数据

一、从MainActivity中跳转到AnotherActivity

        val btnSubmit = findViewById(R.id.button)
        btnSubmit.setOnClickListener {
            val intent =  Intent(this, AnotherActivity::class.java)
            startActivity(intent)
        }

二、从MainActivity跳转到AnotherActivity，并传递 数据

方式一：

val btnSubmit = findViewById(R.id.button)
        btnSubmit.setOnClickListener {
            val intent =  Intent(this, AnotherActivity::class.java)
            intent.putExtra("key1","Value1")
            startActivity(intent)
        }

方式二：

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val btnSubmit = findViewById(R.id.button)
        btnSubmit.setOnClickListener {
            val intent =  Intent(this, AnotherActivity::class.java).apply {
                    putExtra("key1","Value1")
                    putExtra("key2",1.337)
            }
            startActivity(intent)
        }

    }
}

三、在AnotherActivity中接受数据

class AnotherActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_another)

        val keyValue1 = intent.getStringExtra("key1")
        val keyValue2 = intent.getDoubleExtra("key2",0.0)

        Log.i("AnotherActivity", "keyValue1 is "+keyValue1)
        Log.i("AnotherActivity", "keyValue2 is "+keyValue2)
    }
}

运行结果：