Question 127137 in Android Studio Question posted in
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Android Studio – How to save number from EditView in another integer in kotlin

I’m pretty new to android so I will try to explain this the best way I can,

so I have a EditView in an activity I created like this:

<EditText
        android:id="@+id/num"
        android:layout_width="230dp"
        android:layout_height="61dp"
        android:inputType="number"
        android:background="@drawable/border"
        android:layout_marginTop="25dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.502"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView"
        app:layout_constraintVertical_bias="0.129" />

and in my MainActivity.kt I save the number user input’s like this:

val number = findViewById<EditText>(R.id.num)

but when I try to sum the number user input’s with a number I declared in my code like this:

var summ = 1

summ += number

When I launch program I says this:

None of the following functions can be called with the arguments supplied: public final operator fun plus(other: Byte): Int defined in kotlin.Int public final operator fun plus(other: Double): Double defined in kotlin.Int public final operator fun plus(other: Float): Float defined in kotlin.Int public final operator fun plus(other: Int): Int defined in kotlin.Ints public final operator fun plus(other: Long): Long defined in kotlin.Int public final operator fun plus(other: Short): Int defined in kotlin.Int

If anyone knows how I could save the number user input’s with a number I save in my MainActivity.kt please let me know!

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3

Answers


  1. 0

    Try this:

    val number = findViewById<EditText>(R.id.num).text.toString().toInt()
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  2. 0

    Using this should work:

    val number = findViewById<EditText>(R.id.num).text.toString().toInt()

    Since findViewById<EditText>(R.id.num) returns a View not an Int.

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  3. 0

    summ is an Int object, which represents an integer. number is an EditText object, which is a UI widget that (among other things) displays text and allows the user to change the contents of that text. I know that might sound pedantic, but the point is those are two completely different things and you can’t just "add" them to each other, it’s like saying 2 + 🍌.

    The other answers tell you how to get the String contents of the EditText (which you also can’t add to a number), and how to convert a String to an Integer (now you can add them – if the conversion worked!) but this is a general concept you need to understand – it won’t always be as obvious that two different types can’t just be combined, and you’ll have to find a way to get what you need. someTextView.text for example is not a String, and you need to call toString() on it if you want the basic text contents

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