Android data binding problem: "Cause: couldn't make a guess for"

Question

i'm enabling data binding with adding

dataBinding { enabled = true }

and

kapt 'com.android.databinding:compiler:3.1.4'

in app level build.gradle file.

apply plugin: 'kotlin-kapt'

is added top of that. project is based on kotlin .

here is my model:

    package ir.app.myapplication;



data class cisclass(val equRevId:String)

main Activity :

  val binding: ActivityMainBinding = DataBindingUtil.setContentView(this, R.layout.activity_main)

        val user = cisclass("123")
        binding.setVariable(BR.cis, user)
        binding.executePendingBindings()

here is my layout:

<?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="cis"
            type="ir.app.myapplication.cisclass" />
    </data>

    <androidx.core.widget.NestedScrollView


        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="5dp"
        android:orientation="vertical"
        android:scrollbars="vertical">


        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">



                    <TextView
                        android:text="@{cis.equRevId}"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:textStyle="bold"

                        />


        </LinearLayout>


    </androidx.core.widget.NestedScrollView>

</layout>

i will got this error:

java.lang.IllegalArgumentException: couldn't make a guess for ir.meedc.myapplication.cisclass
    at com.squareup.javapoet.Util.checkArgument(Util.java:64)
    at com.squareup.javapoet.ClassName.bestGuess(ClassName.java:171)
    at android.databinding.tool.ext.ExtKt.toTypeName(ext.kt:244)
    at android.databinding.tool.ext.ExtKt.toTypeName(ext.kt:192)
    at android.databinding.tool.ext.ExtKt.toTypeName(ext.kt:173)
    at android.databinding.tool.writer.BaseLayoutBinderWriter.createVariableFields(BaseLayoutBinderWriter.kt:229)
    at android.databinding.tool.writer.BaseLayoutBinderWriter.access$createVariableFields(BaseLayoutBinderWriter.kt:39)
    at android.databinding.tool.writer.BaseLayoutBinderWriter$createType$1.invoke(BaseLayoutBinderWriter.kt:67)
    at android.databinding.tool.writer.BaseLayoutBinderWriter$createType$1.invoke(BaseLayoutBinderWriter.kt:39)
    at android.databinding.tool.ext.Javapoet_extKt.classSpec(javapoet_ext.kt:39)
    at android.databinding.tool.writer.BaseLayoutBinderWriter.createType(BaseLayoutBinderWriter.kt:63)
    at android.databinding.tool.writer.BaseLayoutBinderWriter.write(BaseLayoutBinderWriter.kt:59)
    at android.databinding.tool.BaseDataBinder.generateAll(BaseDataBinder.kt:65)
    at com.android.build.gradle.internal.tasks.databinding.DataBindingGenBaseClassesTask$CodeGenerator.run(DataBindingGenBaseClassesTask.kt:212)
    at com.android.build.gradle.internal.tasks.databinding.DataBindingGenBaseClassesTask$writeBaseClasses$$inlined$recordTaskAction$1.invoke(AndroidVariantTask.kt:52)
    at com.android.build.gradle.internal.tasks.databinding.DataBindingGenBaseClassesTask$writeBaseClasses$$inlined$recordTaskAction$1.invoke(AndroidVariantTask.kt:31)
    at com.android.build.gradle.internal.tasks.Blocks.recordSpan(Blocks.java:91)

how can i fix that? whats the problem?

Maybe its due to the variable not being initialized and you set the variable after the activities layout is being drawn so android has to guess when inflating the textview on what text to render — lukger, Feb 23 '20 at 14:04
thanks for comment, how can i fix this? load model in another method of mainActivity? — javadroid, Feb 23 '20 at 15:59

score 7 · Accepted Answer · answered Feb 24 '20 at 03:51

7

as mentioned in https://stackoverflow.com/a/50115802/7407809 your model class must be start with uppercase letter.

answered Feb 24 '20 at 03:51

Neo Anderson

638
1
4
17

score 0 · Answer 2 · answered Feb 23 '20 at 13:54

0

Try to use instead binding.setVariable(BR.cis, user) this binding.setCis(user)

answered Feb 23 '20 at 13:54

i30mb1

3,894
3
18
34

i added this: ` val user = cisclass("123") binding.setVariable(BR.cis, user) binding.executePendingBindings()` but didnt work – javadroid Feb 23 '20 at 15:57

Android data binding problem: "Cause: couldn't make a guess for"

2 Answers2