Android binding adapter passing multiple arguments cause error

Question

I am quite new in Android Data Binding. I am following this tutorial: Data Binding Library. I am trying to do an adapter that receive multiple parameters. This is my code:

XML

   <ImageView
            android:layout_width="@dimen/place_holder_size"
            android:layout_height="@dimen/place_holder_size"
            android:layout_alignParentRight="true"
            android:layout_alignParentTop="true"
            android:layout_centerVertical="true"
            app:url="@{image.imageUrl}"
            app:size="@{@dimen/place_holder_size}"
            />

BINDING ADAPTER CLASS

public class ViewBindingAdapters extends BaseObservable {

@BindingAdapter({"bind:url", "bind:size"})
public static void loadImage(ImageView imageView, String url, int size) {
    if (!Strings.isNullOrEmpty(url)) {
        Picasso.with(imageView.getContext()).load(url).resize(size, size).centerCrop().into(imageView);
    }
}
....


}

But I am getting this error:

java.lang.RuntimeException: Found data binding errors. ****/ data binding error ****msg:Cannot find the setter for attribute 'app:url' with parameter type java.lang.String on android.widget.ImageView. file:... li_image_item.xml loc:30:27 - 30:40 ****\ data binding error ****

Does anybody know why??

Thanks in advance!

Answer 1

Problem is @dimen/place_holder_size, it returns float while you are catching it as int

change you BindingAdapter method to this

@BindingAdapter({"bind:url", "bind:size"})
public static void loadImage(ImageView imageView, String url, float size) {

}

you can refer this

Answer 2

What I did wrong is the order of the arguments in the function. You can add multiple attributes in Binding Adapter, but they should match the arguments with the same sequence defined in the method.

Here is my code snippet for Kotlin

@BindingAdapter(value = ["bind:brand", "bind:model", "bind:age"], requireAll = false)
@JvmStatic
fun bindProductDetails(linearLayout: LinearLayout, brand: String?, model: String?, age: String?) {
    if (brand != null && !brand.isEmpty()) {
        //code
        //code

    }
}

Answer 3

try this

 @BindingAdapter(value={"url", "size"}, requireAll=false)
 public static void loadImage(ImageView imageView, String url, int size) {
        if (!Strings.isNullOrEmpty(url)) {
            Picasso.with(imageView.getContext()).load(url).resize(size, size).centerCrop().into(imageView);
        }
    }

Answer 4

Update

You don't need to create prefix bind:, just use this.

@BindingAdapter({"url", "size"})
public static void loadImage(ImageView imageView, String url, float size) {

}

In xml use any prefix like app:

app:url="@{image.imageUrl}"

Answer 5

Apart from the example provided above by @Kishan Solanki, And with changes happening in the Data Binding library, all you need is to declare them with comma separated values. Example

@BindingAdapter("loadImageFrom", "widthDp")
fun loadImages(imageView: ImageView, url: String?, widthDp: Int) {
    url?.let {

        val height = (widthDp / 3) * 4
        val fullUrl = getImagePosterUrl(url)
        Picasso.get().load(fullUrl).resize(widthDp.px, height.px).into(imageView)
    }

}

Bu the most important thing to remember is that you provide the data to the adapter attributes, in the DataBinding format.

example to provide Int as parameter in XML you have to write

app:widthDp="@{120}"

which is

app:your_attribute="@{your_data}"

P. S. - Oh and one more thing, widthDp**.px** is an extension function which converts Int of a dp value to relevant pixels value based on screen density. So don't get confused.

Answer 6

See https://developer.android.com/topic/libraries/data-binding/binding-adapters.

@BindingAdapter("imageUrl", "placeholder", requireAll = false)
fun ImageView.setImageUrl(url: String?, placeHolder: Drawable?) {
    if (url == null) {
        setImageDrawable(placeholder)
    } else {
        MyImageLoader.loadInto(this, url, placeholder)
    }
}

Note that BindingAdapter attributes and setImageUrl parameters may have different names. But they should go in the same order. If some of these attributes are defined in XML (in this example it is ImageView), this method will be called.

<ImageView 
    app:imageUrl="@{venue.imageUrl}"
    app:placeholder="@{@drawable/venueError}" />

Attributes should have the same types as defined in the method. You can also use listeners. Instead of Kotlin lambdas use interfaces.

This class should be put in the same module with XML. Otherwise you will get an error like AAPT: error: attribute imageUrl (aka com.example.imageUrl) not found..