How to load a Bitmap with Picasso without using an ImageView?

问题

With ImageView, I can use the following code to download image with callback

Picasso.with(activity).load(url).into(imageView, new Callback()
{
    @Override
    public void onSuccess() 
    {
        // do something
    }

    @Override
    public void onError() { }
);

Or simply get the Bitmap from this Picasso.with(activity).load(url).get();. Is there anyway to add callback for just download the image? If possible please provide sample code, Cheers!

回答1:

You can create a Target and then modify the Bitmap inside the Targets callback method onBitmapLoaded(...). Here is how:

// make sure to set Target as strong reference
private Target loadtarget;

public void loadBitmap(String url) {

    if (loadtarget == null) loadtarget = new Target() {
        @Override
        public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
            // do something with the Bitmap
            handleLoadedBitmap(bitmap);
        }

        @Override
        public void onBitmapFailed() {

        }
    };

    Picasso.with(this).load(url).into(loadtarget);
}

public void handleLoadedBitmap(Bitmap b) {
    // do something here
}

来源：https://stackoverflow.com/questions/24302431/how-to-load-a-bitmap-with-picasso-without-using-an-imageview