I am using Data Binding in my project, when using <layout>
and <data>
in my xml binding class is not generated.
For example i have activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<data> </data>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
</RelativeLayout>
</layout>
Now if i am writing ActivityMainBinding
in my activity/fragment it shows error that class is not available. But after including <variable>
in my xml file, it is able to generate ActivityMainBinding
class.
Android Studio : 2.1.3
Classpath : com.android.tools.build:gradle:2.1.3
minSdkVersion 16
targetSdkVersion 24
buildToolsVersion 24.0.0
Best Answer
I did not get any satisfying answers. So here are the tips which are summary of my data binding knowledge.
Tips For Solving DataBinding Issues
Update
To get more accurate errors and suggestions, I strongly recommend to update Android Studio and Gradle plugin version to the latest. Because I am not facing many issues after AS 3.2 version.
See Latest Android Studio, and Latest Gradle Plugin.
Orignal Solution
Check these points one by one. Any of these can make your work done. Point 3 to last are really important, so don't miss them.
1. Check if data-binding enabled
You should have data binding enabled in
build.gradle
. If not then add this and Sync.2. Check layout is converted in binding layout
Now if you want data binding class to be generated then you should wrap
xml layout
with data binding (<layout
tag). Something like this.Along with this check whether the binding variable names are correct as in the view model class
3. Auto-generated Binding class name?
Your data binding class should be generated after creating binding layout.
4. Can't See Import Suggestion?
Sometimes when you type
ActivityMai...
, then it does not show suggestion, in that case import manually.5. Read Build Fail Logcat
Your binding class and new variables in layout will not be generated if your build fails. So first Make project by Ctrl + F9 (Build > Make project).
6. Close and open project from recent
I always do this because it takes much less time than
Rebuild
/Make
project.Note that I prefer Close and Open from Recent because it takes much less time than Rebuild / Restart IDE.
7. Rebuild Project
If still your class is not generated. (Some time when we paste layout file, then it happens). Then Rebuild Project from
Build> Rebuild
(Not Build or Make project). It will generate your data binding class. (Rebuild does Magic for me.)8. Have latest Android Studio
After updating AS to Android Studio 3.2, I felt many bugs fix in data binding auto generation. So you should also have the latest AS.
#Solution for
<variables
Usually, when we put a variable in layout, it creates a getter and setter of it. And we can use
binding.setItem(item);
andbinding.getItem();
, but if you can't see those methods then read the below information.1. Close and open project from recent
If you have created a data variable -
<variable
in your layout and it does not show up its setter and getter in data binding class, then Close and Open from Recent your project.2. Clean project after changing the type
If you changed the type of some
<variable
in your layout and getter setter type is not changing then Clean project (Build> Clean Project
)Final words
Finally if still your binding class is not generated, then we have our most powerful weapon. - Restart Android Studio
This is all that i do to solve my data binding errors. If you get any further issues, you can comment here.