android kotlin cannot @+id in MainActivity

To use @+id in Kotlin for Android, you need to follow these steps:

1. Open the layout XML file associated with your MainActivity. This file is usually located in the res/layout directory and has a name like activity_main.xml.

2. Inside the layout XML file, locate the view for which you want to assign an ID. This can be any view element such as a TextView, Button, or ImageView.

3. Add the android:id attribute to the view element and assign it a unique ID value. The syntax for assigning an ID is @+id/your_id_name. For example, if you want to assign an ID "myTextView" to a TextView, you would use android:id="@+id/myTextView".

Example:xml <TextView android:id="@+id/myTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!" />

1. Save the layout XML file.

2. Now, go to your MainActivity Kotlin file (usually named MainActivity.kt) and open it.

3. Inside the onCreate() method of your MainActivity, after the setContentView() method, you can access the view with the assigned ID using the findViewById() method.

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

   val myTextView = findViewById<TextView>(R.id.myTextView)
   // Now you can use myTextView to manipulate the TextView in your code

} ```

By following these steps, you can use @+id in MainActivity to assign IDs to views and access them in your Kotlin code.