Picasso java.lang.IllegalStateException: Method call should not happen from the main thread

Question

I am attempting to use Picasso to get three Bitmap images from a URL

public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState);
  setContentView(R.layout.tab2);
  Drawable d1 = new BitmapDrawable(Picasso.with(Tab2.this).load(zestimateImg1).get());
}

I am getting FATAL EXCEPTION with this code. I suspect it has to do with the fact that this should be done within AsyncTask, but I can't get it to work. If using that is avoidable, I would like to do this without using AsyncTask.

How can I get this code to run without crashing?

If the best way to do this is with AsyncTask, then that solution is ok.

Answer 1

You cannot make synchronous requests in the main thread. If you dont want to use an AsyncThread then just use Picasso together with a Target.

Picasso.with(Tab2.this).load(zestimateImg1).into(new Target(...);

I recommend you save a reference to your target like so:

Target mTarget =new Target (...); 

This is because Picasso uses weak references to them and they might be garbage collected before the process is finished.

Answer 2

None of above worked for me instead this

Handler uiHandler = new Handler(Looper.getMainLooper());
    uiHandler.post(new Runnable(){
        @Override
        public void run() {
            Picasso.with(Context)
                    .load(imageUrl)
                    .into(imageView);
        }
    });

Hope it may be useful for someone

Answer 3

Just for the record:

Picasso.with(context).load(url).into(new Target() {
    @Override
    public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
        Log.i(TAG, "The image was obtained correctly");
    }

    @Override
    public void onBitmapFailed(Drawable errorDrawable) {
        Log.e(TAG, "The image was not obtained");
    }

    @Override
    public void onPrepareLoad(Drawable placeHolderDrawable) {
        Log.(TAG, "Getting ready to get the image");
        //Here you should place a loading gif in the ImageView
        //while image is being obtained.
    }
});

Source: http://square.github.io/picasso/

onPrepareLoad() is called always after starting the request. from can be "DISK", "MEMORY" or "NETWORK" to indicate where was the image obtained from.