data binding - safeUnbox warning

Question

after i upgrade AS gradle version to 2.3.0, data binding encounter a warning :

Warning:selectMap[index] is a boxed field but needs to be un-boxed to execute selectMap[index] ? @android:color/white : @android:color/transparent. This may cause NPE so Data Binding will safely unbox it. You can change the expression and explicitly wrap selectMap[index] with safeUnbox() to prevent the warning

selectMap is an ObservableMap, then i search this warning but got just few discussions and did not fix it

Android Studio 2.3.0-alpha1: Databinding + int unboxing causes compile errors

Databinding - data object is null on API 15-18

I follow the way in the links, modify selectMap[index] to safeUnbox(selectMap[index]) but got syntax error.

So anyone know how to fix this warning?

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Edit : Here is the xml file code

<?xml version="1.0" encoding="utf-8"?> 

<data class="SupportCountryViewHolderBinding">      <variable         name="viewModel"         type="com.goodarc.care_about.activity.account.support_country.SupportCountryHolderViewModel" />      <variable         name="dataSource"         type="com.goodarc.care_about.module.assets_file.SupportCountry" />      <variable         name="selectMap"         type="android.databinding.ObservableMap&lt;Integer, Boolean&gt;" />      <variable         name="index"         type="int" /> </data>  <LinearLayout     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:background="@{selectMap[index] ? @android:color/white : @android:color/transparent}"     android:onClick="@{(v) -> viewModel.onItemSelectListener(selectMap, index)}"     android:orientation="vertical"     android:padding="20dp">      <TextView         style="@style/TitleLabel2"         android:layout_gravity="center_vertical|start"         android:text="@{dataSource.display}"         android:textColor="@{selectMap[index] ? @android:color/black : @android:color/white}"         tools:text="Taiwan (+886)" /> </LinearLayout> 

Build is succeed, but warning come out(i past above).

Answer 1

I had the same warning, in my case changing the variable declaration from Boolean type to boolean type solve the problem:

From:

<variable         name="readOnly"         type="Boolean" /> 

To:

<variable         name="readOnly"         type="boolean" /> 

So, maybe you can try with:

<variable     name="selectMap"     type="android.databinding.ObservableMap&lt;Integer, boolean&gt;" />