ResourcesNotFoundException when binding Int to a TextView

Question

Binding an Int value to a TextView causes a Resources$NotFoundException with message "String resource ID #0x2a" (where 0x2a is the value of the Int). Why does this happen, and how can it be fixed?

Sample code: * layout/activity_main.xml:

    <?xml version="1.0" encoding="utf-8"?>
    <layout xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:tools="http://schemas.android.com/tools">

        <data>
            <variable name="data" type="com.example.Thing" />
        </data>

        <LinearLayout tools:context=".MainActivity">
            <TextView android:text="@{data.x}"/>
        </LinearLayout>
    </layout>

Thing.kt:

package com.example

data class Thing(
    var x:Int = 42
)

MainActivity.kt:

package com.example

import android.databinding.DataBindingUtil
import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import com.example.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        var activityMain:ActivityMainBinding = DataBindingUtil.setContentView(this, R.layout.activity_main)
        activityMain.data = Thing()
    }
}

You cannot call `setText()` with an arbitrary integer value. That `setText()` overload expects the `int` to be a string resource ID. You would need to convert your value to a `String` first. — Mike M., Jan 12 '19 at 03:38
Another match for an original question: '[Data Binding : Resources$NotFoundException when attribute of object is int](https://stackoverflow.com/q/32837455/90527)". It's that `Resources$NotFoundException` that makes searching difficult. This duplicate will hopefully make finding the originals easier. — outis, Jan 12 '19 at 04:03

score 6 · Accepted Answer · answered Jan 12 '19 at 03:41

TextView.setText(int), which was created before data binding was added to Android, interprets its argument as a resource identifier. To bind an integer to a TextView, convert the value with Integer.toString(int) or String.valueOf(int) (Int.toString apparently isn't available, as the value is unboxed):

    <TextView android:text="@{Integer.toString(data.x)}"/>

If TextView.setText(int) didn't exist, you could also write a binding adapter to automatically convert between the bound value type and the type the View displays.

ResourcesNotFoundException when binding Int to a TextView

1 Answers1