kotlin - 如何在 Kotlin 的一行中声明 startActivityforResult()？

Question

我想调用startActivityforResult在 Kotlin 的一行语句中。像这样的东西:

startActivityForResult(Intent(this@MainActivity2,MainActivity::class.java),1))

Answer 1

这是对 startActivityForResult 进行单行调用的一种简洁方法。在结果事件中，您必须创建一个伴随对象来设置启动意图。

事件

class MyActivity {
    companion object {
        const val CONTACT_REQUEST = 1
    }

    fun activityCall() {
        startActivityForResult(MyActivity.getLaunchIntent(this), CONTACT_REQUEST)
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        // Check which request we're responding to
        if (requestCode == MyActivity.CARD_CONTACT_REQUEST) {
            // Make sure the request was successful
            if (resultCode == Activity.RESULT_OK) {
                // The user picked a contact.
                // The Intent's data Uri identifies which contact was selected.

                // Do something with the contact here (bigger example below)
            }
        }
    }
}

结果类

class MyResultActivity {
    companion object {
        fun getLaunchIntent(context: Context): Intent {
            val intent = Intent(context, MyActivity::class.java)
            return intent
        }
    }
}