DataBinding: How to get resource by dynamic id?

Question

I know that it is possible to reference resources in layout by their resource id:

android:text=\"@{@string/resourceName}\"

However, I would

Answer 1

Another solution if you already have Context defined in your xml then you will not need to import String class.

android:text="@{@string/myFormatString(context.getString(pojo.res))}"

will work for

<string name="myFormatString">Value is: %s</string>

If you don't have context in your xml. then follow this

<data>    
     <variable
         name="context"
         type="abc.UserActivity"/>

     <variable
         name="pojo"
         type="abc.MyPOJO"/>
 </data>

and in your Activity

ActivityUserBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_user);
binding.setPojo(new MyPOJO());
binding.setContext(this);

Answer 2

Kotlin version:

@BindingAdapter("template", "resId")
fun TextView.setFormattedText(template: String, resId: Int) {
    if (template.isEmpty() || resId == 0) return
    text = template.format(resources.getString(resId))
}

in xml

<TextView
    app:template="@{@string/myFormatString}"
    app:resId="@{viewModel.resourceId}"/>

Answer 3

I ended up creating my own method:

public class BindingUtils {

    public static String string(int resourceId) {
        return MyApplication
                .getApplication()
                .getResources()
                .getString(resourceId);
    }

}

Declaring an import for it:

<data>

    <import type="com.example.BindingUtils" />

    ...

</data>

And just calling it during binding:

android:text="@{@string/myFormatString(BindingUtils.string(myPojo.resourceId))}"

Would be nice to have out-of-the-box method for that. DataBinding is sitll in Beta - so maybe it will come in future.

Answer 4

As of June 2016 this is possible in XML:

android:text= "@{String.format(@string/my_format_string, myPojo.resourceId)}"

Answer 5

You can use:

android:text='@{(id > 0) ? context.getString(id) : ""}'

Answer 6

Another solution is to create a custom @BindingAdapter for it.

@BindingAdapter({"format", "argId"})
public static void setFormattedText(TextView textView, String format, int argId){
    if(argId == 0) return;
    textView.setText(String.format(format, textView.getResources().getString(argId)));
}

And then just provide the variables separately.

<TextView
    app:format="@{@string/myFormatString}"
    app:argId="@{myPojo.resourceId}"

You could use an array if you need multiple arguments, but in my case, one was sufficient.