How to set Image resource to ImageView using DataB

问题:

This question already has answers here:

Set drawable resource ID in android:src for ImageView using data binding in Android (14 answers)

Closed 2 years ago.

How can we use data binding in android to put image resource in an ImageView?

  <ImageView
            android:id="@+id/is_synced"
            android:src="@{model.pending ? @mipmap/pending: @mipmap/synced}"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

I want an image if pending is true and another image if pending is false. But it's showing error.How can I achieve this functionality?

回答1:

set image like this,

  <ImageView
        android:layout_width="28dp"
        android:layout_height="28dp"
        android:src="@{model.isActive ? @drawable/white_activated_icon :@drawable/activated_icon}"
        tools:src="@mipmap/white_activated_icon" />

回答2:

The answer:

define:

@BindingAdapter({"android:src"})
public static void setImageViewResource(ImageView imageView, int resource) {
    imageView.setImageResource(resource);
}

use:

<ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true"
    android:scaleType="center"
    android:src="@{viewModel.imageRes, default=@drawable/guide_1}"/>

回答3:

I tried this, and it works for me (buildToolsVersion: 24.0.1):

<ImageView
    android:layout_width="50dp"
    android:layout_height="50dp"
    android:layout_margin="8dp"
    android:scaleType="centerInside"
    app:imageResource="@{item.avatarResId}"/>

just use app:imageResource to replace android:src, android:src="@{item.avatarResId}" doesn't works else define a custom @BindAdapter("android:src") for it.

but use app:imageResource doesn't need define a @BindAdapter additionally, because the ImageView has a method called setImageResource(), when you use app:imageResource, it will call setImageResource() automatically.

回答4:

You can do this without doing anything programmatically if your data model contains the resource ID of the image.

Example:

<layout>

<data>
<import type="android.support.v4.content.ContextCompat" />            
<variable
name="roomInfoItem"
type="com.example......model.RoomInfoModel" /> </data>

<RelativeLayout> 

 <ImageView
    android:id="@+id/iv_room_info_item"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
 />

</RelativeLayout>

</layout>

Just add the following line to your imageView (I wasn't able to format the code when I was adding it there):

android:src="@{ContextCompat.getDrawable(context,roomInfoItem.resId)}"

where resId contains R.drawable.your_image_name

回答5:

If you would like to pass an argument into the method like an @IdRes you can use

XML:

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools">

    <data>

        <import type="<package_name>.R" />
    </data>

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        app:load_image="@{R.drawable.image}" />
</layout>

Code

@BindingAdapter("load_image")
public static void loadImage(ImageView view, @IdRes int imageId) {
    //Logic
}

回答6:

Accorrding to this great article: Loading images with Data Binding and Picasso

there are two ways to do it:

1. Using @BindingAdapter
2. ObservableField & custom Picasso Target

In Android Developers reference Data Binding Guide, you would find only the first one.

Please read both articles.

More informations:

• http://www.mutualmobile.com/posts/using-data-binding-api-in-recyclerview
• https://blog.stylingandroid.com/data-binding-part-3/

Hope it help.

回答7:

More details Refer here Details Loading images with data binding and Picasso

public class ProfileViewModel {
// The URL will usually come from a model (i.e Profile)
static final String IMAGE_URL = "http://cdn.meme.am/instances/60677654.jpg";
public ObservableField<Drawable> profileImage;
private BindableFieldTarget bindableFieldTarget;

public ProfileViewModel(Context context) {
    profileImage = new ObservableField<>();
    // Picasso keeps a weak reference to the target so it needs to be stored in a field
    bindableFieldTarget = new BindableFieldTarget(profileImage, context.getResources());
    Picasso.with(context)
            .load(IMAGE_URL)
            .placeholder(R.drawable.placeholder)
            .into(bindableFieldTarget);
}

public class BindableFieldTarget implements Target {

    private ObservableField<Drawable> observableField;
    private Resources resources;

    public BindableFieldTarget(ObservableField<Drawable> observableField, Resources resources) {
        this.observableField = observableField;
        this.resources = resources;
    }

    @Override
    public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
        observableField.set(new BitmapDrawable(resources, bitmap));
    }

    @Override
    public void onBitmapFailed(Drawable errorDrawable) {
        observableField.set(errorDrawable);
    }

    @Override
    public void onPrepareLoad(Drawable placeHolderDrawable) {
        observableField.set(placeHolderDrawable);
    }
}
}

回答8:

The problem is with all the attributes which do on have setters with same name. e.g. android:x wont work if setX() method is not there in that view likewise if we had setSrc() method on ImageView your code would have worked without custom binding adapter

回答9:

<ImageView ...
        app:svg="@{@drawable/ic_car_placeholder}" />

then

@BindingAdapter({"app:svg"})
public static void setImageViewResource(ImageView imageView, Drawable resource) {
    imageView.setBackgroundDrawable(resource);
}