Android DataBinding error. Could not find accessor

Question

I'm getting the following error when I try to run my app:

Error:Execution failed for task ':app:compileDevelopmentDebugJavaWithJavac'.
> java.lang.RuntimeException: Found data binding errors.
****/ data binding error ****msg:Could not find accessor java.lang.String.giftRecipientName redacted.xml loc:182:63 - 182:93 ****\ data binding error ****

I have an Order object which looks like this:

public class Order {
    public Address address;
    // unrelated fields and methods
}

The nested Address object looks like this:

public class Address {
    public String addressLine1;
    public String addressLine2;
    public String giftRecipientName;
    public Boolean isGift;
}

In my .xml I am doing the following:

<layout xmlns:android="http://schemas.android.com/apk/res/android">

    <data>
        <variable name="order" type="example.redacted.models.Order"/>
    </data>
    // widgets and whatnot
    <TextView
        android:id="@+id/gift_recipientTV"
        android:layout_column="1"
        android:layout_weight="1"
        android:layout_width="0dp"
        android:textStyle="bold"
        android:gravity="right"
        android:text='@{order.address.isGift ?  order.address.giftRecipientName : "" }'/>

Lastly in my fragment:

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    RedactedBinding dataBinding = DataBindingUtil.inflate(inflater, R.layout.redacted, container, false);
    dataBinding.setOrder(_order);
    return dataBinding.getRoot();
}

Answer 1

After hours of trial and error it seems that Android data-binding looks for getters before it looks at public fields. My Order object had a helper method called getAddress

public class Order {
    public Address address;

    public String getAddress() {
        return address.addressLine1 + address.addressLine2;
    }
}

The binder was calling that method instead of accessing the public Address field. I put the getAddress method inside the Address object (where it probably should have been to begin with) and the app compiled.

Answer 2

Android DataBinding error. Could not find accessor

• As this error tells, binding needs accessor or getter to work and also setter if you use two way binding.
• So always put getter & setter in your model class.

Answer 3

In my case, My ViewModel has a variable name starting with m and it was creating a problem

public class MyViewModel extends ViewModel {
    private LiveData<SomeClass> mTask; //Chaning the variable name to task and it's getter name to getTask worked for me
    //...code left for brevity
    public LiveData<SomeClass> getmTask() {
        return mTask;
    }
}

I changed the variable name mTask to task and it's getter name getmTask to getTask and it worked for me.

public class MyViewModel extends ViewModel {
    private LiveData<SomeClass> task;
    //...code left for brevity
    public LiveData<SomeClass> getTask() {
        return task;
    }
}

And In my xml file I was able to access it

<TextView
    ...
    android:text="@{viewmodel.task.title}"