I have an Int which contains a decimal number in units of tenths, so for example my int holds 308 to represent the decimal number 30.8. I want to use data binding to display this number in a TextView along with some other text. My TextView has the following text entry:
android:text="@{String.format("my value: %.1f", @{viewModel.myValue}.toFloat()/10.0f)}"
This fails to build with the following error:
[databinding] {"msg":"cannot find method toFloat() in class java.lang.Integer","file":"app/src/main/res/layout/fragment_you.xml","pos":[{"line0":163,"col0":54,"line1":163,"col1":84}]}
The value in question is defined like so:
private val _myValue = MutableLiveData<Int>()
val myValue: LiveData<Int> = _myValue
I thought this meant it was a Kotlin integer and i could call Kotlin functions on it, but apparently it's a java integer and I can't?
Why can't I call toFloat() there? How can I display this Int as a decimal number?
This might help you.
DataBindingConverter.kt
class DataBindingConverters {
companion object {
@JvmStatic
fun convertIntegerToFloat(value: Int?): Float {
return value/10.0f
}
}
}
XML import
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<import type="com.package.DataBindingConverter" />
</data>
.....
Bind to View
<EditText
...
android:text="@={DataBindingConverter.convertIntegerToFloat(viewModel.myValue)}" />
In xml if you want to use casting you will have to do it the way you do in JAVA
Here to convert it to float try using ->
android:text="@{String.format("my value: %.1f", Float.valueOf(@{viewModel.myValue})/10.0f)}"
.toFloat is to be done in kotlin classes. In xml still you have to use JAVA
I think, it will work.
android:text="@{String.format("my value: %.1f", @{(Float)(viewModel.myValue)}/10.0f)}"