TextView文本会更改，但不会在布局中更新（Kotlin-Android）

Question

TextView文本会更改，但不会在布局中更新。我尝试了所有可以找到的方法，但是没有任何效果。我有一个非常简单的应用程序，具有一个活动和3种布局*。^{*这是我制作的第一个应用程序，所以我想这样会更简单}我面临的主要问题是两个：几乎所有的信息都是旧的，并且都在Java中，并且我的textView文本没有更改。.该应用程序是我尝试作为练习的一个简单的Rock-Paper-Scissor游戏。

textViews.text值得到更新，但布局始终显示相同的文本...我不知道可能是什么问题。我也正在努力确切地了解所有这些工作原理，例如InflateLayout，Context和Android。我对android的参考了解不多。

[[没有INFLATE（），POSTINFLATE（），FORCELAYOUT（），可见性切换，因为它们都不起作用：（

代码摘录

class MainActivity : AppCompatActivity() {

lateinit var TITLE:TextView
lateinit var PARAGRAPH:TextView

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

    val InflaterInitializer = LayoutInflater.from(applicationContext) as LayoutInflater
    val inflater = InflaterInitializer.inflate(R.layout.activity_2, null, false)

    TITLE= inflater.findViewById(R.id.title) as TextView
    PARAGRAPH= inflater.findViewById(R.id.paragraph) as TextView

}

共有三个功能：

fun FUNCTION(v :View) {
    val userChoice = "XXX"
    val computerChoice = getComputerChoice()
    if (userChoice == computerChoice) {
        FUNCTION_2(computerChoice)
    } else {
        runOnUiThread {
            TITLE.text =
                if (computerChoice == "YYY") getString(R.string.YOU_WON) else getString(R.string.YOU_LOSE);
            PARAGRAPH.text = getString(R.string.STRING, computerChoice)
        }
    }; resultScreen()
}

Function_2 ...

private fun FUNCTION_2(cc :String) {
    runOnUiThread {
        TITLE.text = getString(R.string.STRING)
        PARAGRAPH.text = getString(R.string.STRING, cc)
    }; resultScreen()
}

resultScreen（）只是对setContentView（LAYOUT）的调用
代码在这里完成：https://github.com/noiwyr/MorraCinese
以下是该应用和更新问题的视频：https://imgur.com/a/iWCRMkq

Answer 1

您不需要任何东西，您可以通过代码创建，我建议您没有问题

val InflaterInitializer = LayoutInflater.from（applicationContext）as LayoutInflater val inflater = InflaterInitializer.inflate（R.layout.activity_outcome，null，false）

注释上面的代码，无需在Kotlin中进行

motivRisultato.text = getString（R.string.scelta_pc，computerChoice）

简单地编写这种类型的代码

Answer 2

通过调用InflaterInitializer.inflate(R.layout.activity_2, null, false)，您从指定的xml资源中填充了一个新的视图层次结构，该资源未附加到您的任何视图中（这些新视图未显示在屏幕上）。然后，您从该

new视图层次结构中找到了文本视图，并更改了它们的标题。

因此，您的onCreate方法必须看起来像这样：

override fun onCreate(savedInstanceState :Bundle?) {
   super.onCreate(savedInstanceState)
   setContentView(R.layout.activity_2)

   TITLE = findViewById(R.id.title)
   PARAGRAPH = findViewById(R.id.paragraph)
}

[另外，使用方法runOnUiThread()（您的代码已经在Ui线程上运行）和resultScreen()是多余的。

Answer 3

您的代码中有很多错误，因此我将用您的代码来分解答案。是否找到内嵌的注释

class MainActivity : AppCompatActivity() {

    /**
    * First, Follow conventions for naming variables, they are usually in camelcase for variables and functions, Capitalized for Constants.
    * Second, lateinit is used to defer the initialization of a variable, for views, such as 
    * TextView's, you could use the Kotlin Synthentic library which automatically references the Views of your layout. 
    */
    lateinit var TITLE:TextView
    lateinit var PARAGRAPH:TextView

    override fun onCreate(savedInstanceState :Bundle?) {
        super.onCreate(savedInstanceState)
        /** 
        * Set content view, internally set's the layout file after inflation using the Activity context. Which means, that you do not 
        * need to specifically inflate the view. 
        */
        setContentView(R.layout.activity_main)

        /**
        * This is the reason why your layout doesn't know refresh, what you're doing here is inflating another layout, but not setting it to your activity. 
        * This is not required as explained above
        */
        val InflaterInitializer = LayoutInflater.from(applicationContext) as LayoutInflater
        /**
        * Inflater inflates a View Object. one would use this approach if they were programatically adding Views 
        */
        val inflater = InflaterInitializer.inflate(R.layout.activity_2, null, false)

        /**
        * the below views are pointing to a reference of TextView for the non visible inflated view. Which is the reason why the text is not updated. 
        */
        TITLE= inflater.findViewById(R.id.title) as TextView
        PARAGRAPH= inflater.findViewById(R.id.paragraph) as TextView

    }
}

这是使事情正常运行的代码
class MainActivity : AppCompatActivity() {

    private var title:TextView? = null
    private var paragraph:TextView? = null

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

        title= inflater.findViewById(R.id.title) as TextView
        paragraph= inflater.findViewById(R.id.paragraph) as TextView

    }

    fun function(v :View) {
        val userChoice = "XXX"
        val computerChoice = getComputerChoice()
        if (userChoice == computerChoice) {
            function2(computerChoice)
        } else {
            title.text = if (computerChoice == "YYY") getString(R.string.YOU_WON) else getString(R.string.YOU_LOSE);
            paragraph.text = getString(R.string.STRING, computerChoice)

        } 
        resultScreen()
    }

    private fun function2(cc :String) { 
       title.text = getString(R.string.STRING)
       paragraph.text = getString(R.string.STRING, cc)
       resultScreen()
    }
}

如果您的用例是显示不同的屏幕，请考虑启动多个活动并使用Intents在它们之间进行转换>