Picasso image load callback
The .into
method provides a second argument which is a callback to success and failure. You can use this to keep track of when all three have been called and act on their visibility all at once.
Javadoc: https://square.github.io/picasso/2.x/picasso/com/squareup/picasso/RequestCreator.html#into-android.widget.ImageView-com.squareup.picasso.Callback-
This is loading a image url into an imageview with simple picasso callbacks
Picasso.with(this)
.load(Picurl)
.into(Imageview, new Callback() {
@Override
public void onSuccess() {
}
@Override
public void onError() {
}
}
);
And this is picasso image loading with more callbacks
private void loadImage() {
Picasso.with(this)
.load(PicURL)
.into(mContentTarget);
}
private Target mContentTarget = new Target() {
@Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
Imageview.setImageBitmap(bitmap);
}
@Override
public void onBitmapFailed(Drawable errorDrawable) {
}
@Override
public void onPrepareLoad(Drawable placeHolderDrawable) {
}
};
Here is a simple example how to impement Picasso picture loading callback:
Picasso.with(MainActivity.this)
.load(imageUrl)
.into(imageView, new com.squareup.picasso.Callback() {
@Override
public void onSuccess() {
//do smth when picture is loaded successfully
}
@Override
public void onError() {
//do smth when there is picture loading error
}
});
On the latest Picasso's version, onError recives an Exception as parameter and uses get() instead of with()
Picasso.get()
.load(imageUrl)
.into(imageView, new com.squareup.picasso.Callback() {
@Override
public void onSuccess() {
//do smth when picture is loaded successfully
}
@Override
public void onError(Exception ex) {
//do smth when there is picture loading error
}
});
You can implement a callback with Picasso like shown below:
ImageHandler.getSharedInstance(getApplicationContext()).load(imString).skipMemoryCache().resize(width, height).into(image, new Callback() {
@Override
public void onSuccess() {
layout.setVisibility(View.VISIBLE);
}
@Override
public void onError() {
}
});
}
The implementation of my ImageHandler class is shown below:
public class ImageHandler {
private static Picasso instance;
public static Picasso getSharedInstance(Context context)
{
if(instance == null)
{
instance = new Picasso.Builder(context).executor(Executors.newSingleThreadExecutor()).memoryCache(Cache.NONE).indicatorsEnabled(true).build();
}
return instance;
}
}