Android Kotlin-开始活动并从意图中获取数据

问题描述

我只想开始一个活动并将一些数据发送到第二个活动，这是我的代码:

I want to simply start an activity and send some data to my second activity , this is my code :

主要活动:

 val intent = Intent(this@MainActivity, Cards::class.java)
            intent.putExtra("title", catItem.name)
            intent.putExtra("catId", catItem.id)
            startActivity(intent)

catItem不为null，并且其中的每个项目都具有值，我已经调试了，并且对此很确定.

catItem is not null and every item in it has value , i've debugged and I'm sure about it .

我需要获取数据的第二个活动:

the second activity that I need to get data :

 val bl:Bundle=intent.extras
    catId=bl.getString("catId")
    title=bl.getString("title")

它在第二行崩溃:

 bl.getString("catId") must not be null

我调试了，捆绑包完全是空的.

I debugged and the bundle is completely empty .

此代码有什么问题?

推荐答案

要检索第二个活动的数据，您只需要直接访问intent的额外数据，如下所示:

To retrieve data on second activity you just need to access directly intent's extra data as follows:

val catId = intent.getStringExtra("catId")

此外，请确保"catId"类型为String(ID通常为Integer或Long)，因为如果它不是String，则会出现相同的错误.

Also, be sure that "catId" type is String (an ID usually is an Integer or Long), because if it is not an String, you will get the same error.

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