Develop Reference

Checking if imageView is empty with Picasso

I have database table, there is a column "image_link", so when I open activity, class Picasso get this image_link and show me image. But now I also may have path to image in my column instead of imageLink, but I need show image in any case, I think that it will work if I will do something like that:
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
Picasso.get().load(favouriteTemplates.get(position).getImageLink()).into(holder.icon);
if(holder.icon.getDrawable() == null){
Picasso.get().load(new File(favouriteTemplates.get(position).getImageLink())).into(holder.icon);
}
}
But I know, that it takes some time to download image into imageview with Picasso, so my "if" always is true. How can I solve it?

Picasso.get()
.load(favouriteTemplates.get(position).getImageLink())
.into(holder.icon),
new Callback() {
#Override
public void onSuccess() {
//Do Nothing
}
#Override
public void onError(Exception e) {
Picasso
.get()
.load(newmFile(favouriteTemplates.get(position).getImageLink()))
.into(holder.icon);
}
}
);

Picasso Not Loading Images From Server

My problem statement is to load the images from the server.
Now I have used picasso inside the custom adapter.
The image which I am downloading its size is approximately 100kb
not more than that.But instead of displaying the image white background is
been displayed.
To check error I have used callback but somehow the callback is not working
I mean the callback is never getting called.
Below is my code
#Override
public void onBindViewHolder(FolderListAdapter.Viewholder holder, int position) {
userDetails=userList.get(position);
//Context context=);
if(userDetails.getLogo()!=null && !userDetails.getLogo().isEmpty()) {
Context context=holder.cardProfilePic.getContext();
Picasso.with(context)
.load(userDetails.getLogo())
.fit()
.into(holder.cardProfilePic, new Callback() {
#Override
public void onSuccess() {
Log.d("succes","success");
}
#Override
public void onError() {
Log.d("failure","failure");
}
});
}
if(userDetails.getBanner()!=null && !userDetails.getBanner().isEmpty()) {
Picasso.with(context)
.load(userDetails.getBanner())
.resize(300,300)
.into(holder.cardBackgroundPic);
}
if(userDetails.getPersonName()!=null && !userDetails.getPersonName().isEmpty()) {
holder.username.setText(userDetails.getPersonName());
}
if(userDetails.getDesignation()!=null && !userDetails.getDesignation().isEmpty()) {
holder.userRole.setText(userDetails.getDesignation());
}
}

How to clear images loaded by Picasso on Android?

I have a BackgroundImageActivity that load background image using Picasso. But when I go back to home (onStop() called in BackgroundImageActivity) and go into another instance of this activity, which is supposed to load another background image, but at first 2 seconds, it still shows the image from previous BackgroundImageActivity. Is this some kind of cache?
How I can clear this image so that whenever I go into a new instance of BackgroundImageActivity, i don't see the image from previous one?
public class BackgroundImageActivity extends Activity {
#Override
public void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
initBackground();
}
#Override
protected void onStop() {
super.onStop();
Picasso.invalidate(imageUrl, getApplicationContext());
}
private void initBackground() {
...
}
private void setBg(final String imageUrl, final int bg) {
this.imageUrl = imageUrl;
final RequestCreator picassoRequest = Picasso.load(imageUrl, bg).memoryPolicy(MemoryPolicy.NO_CACHE);
targetReference = new Target() {
#Override
public void onBitmapLoaded(final Bitmap bitmap, final Picasso.LoadedFrom from) {
...
}
#Override
public void onBitmapFailed(final Drawable errorDrawable) {
...
}
#Override
public void onPrepareLoad(final Drawable placeHolderDrawable) {
...
}
};
picassoRequest.placeholder(bg).error(bg).into(targetReference);
}
}
Thanks!!!

Use this piece of code while loading the image.
Picasso.with(getContext())
.load(data.get(pos)
.getFeed_thumb_image())
.memoryPolicy(MemoryPolicy.NO_CACHE)
.into(image);
Picasso set the image to ImageView directly without caching in the background. This makes the app lightweight also.

Fade in animation while loading image Using Picasso

I want to show a fade effect when image is loading on Imageview. I am using picasso to cache image and display in image view. I have searched alot for this but couldnt find any solution.
I have used earlier before and i know in some version they had .fade(int Duration) method to fade image while loading but i couldnt find this method anymore.
Here is what i am doing now
Picasso.with(context)
.load(viewHolder.data.imageList.get(0).url)
.networkPolicy(NetworkPolicy.OFFLINE)
.placeholder(R.drawable.a_place_holder_list_view)
.error(R.drawable.a_place_holder_list_view)
.into(viewHolder.ivUser, context.loadImage(viewHolder.ivUser, viewHolder.data.imageList.get(0).url));
public Callback loadImage(RoundedImageView ivUser, String url) {
return new callback(ivUser, url);
}
public class callback implements Callback {
RoundedImageView imageView;
String url;
public callback(RoundedImageView imageView, String url) {
this.imageView = imageView;
this.url = url;
}
#Override
public void onSuccess() {
}
#Override
public void onError() {
Picasso.with(BaseActivity.this)
.load(url)
.placeholder(R.drawable.a_place_holder_list_view)
.error(R.drawable.a_place_holder_list_view)
.into(imageView, new Callback() {
#Override
public void onSuccess() {
}
#Override
public void onError() {
Log.v("Picasso", "Could not fetch image");
}
});
}
}
Please help me i have been stuck in this for quite long time.
Thanks in advance.

Quoting Jake Wharton's answer here:
If the image comes from anywhere except the memory cache the fade
should be automatically applied.
If you check the PicassoDrawable class
boolean fade = loadedFrom != MEMORY && !noFade;
if (fade) {
this.placeholder = placeholder;
animating = true;
startTimeMillis = SystemClock.uptimeMillis();
}
.
.
.
#Override public void draw(Canvas canvas) {
if (!animating) {
super.draw(canvas);
} else {
.
.
.
fade effect is already applied for images loaded from n/w and not memory/cache
and FADE_DURATION = 200f; //ms
To force fade, again quoting jake wharton's answer here:
You can specify noFade() and then always play an animation in the
image loaded callback. You can also rely on the callback being called
synchronously to determine if an animation needs played.
final AtomicBoolean playAnimation = new AtomicBoolean(true);
Picasso.with(context).load(..).into(imageView, new Callback() {
#Override public void onLoad() {
if (playAnimation.get()) {
//play fade
Animation fadeOut = new AlphaAnimation(0, 1);
fadeOut.setInterpolator(new AccelerateInterpolator());
fadeOut.setDuration(1000);
imageView.startAnimation(fadeOut);
Animation fadeOutPlaceholder = new AlphaAnimation(1, 0);
fadeOutPlaceholder.setInterpolator(new AccelerateInterpolator());
fadeOutPlaceholder.setDuration(1000);
placeHolderImageView.startAnimation(fadeOutPlaceholder);
}
}
//..
});
playAnimation.set(false);

You can simply do
Picasso.with(context).load(url).fetch(new Callback(){
#Override
public void onSuccess() {
imageView.setAlpha(0f);
Picasso.with(context).load(url).into(imageView);
imageView.animate().setDuration(300).alpha(1f).start();
}
#Override
public void onError() {
}
});

I do this:
Picasso.get().load(url).fit().noFade().centerInside().into(imageView, new Callback() {
#Override
public void onSuccess() {
imageView.setAlpha(0f);
imageView.animate().setDuration(200).alpha(1f).start();
}
#Override
public void onError(Exception e) {
}
});

Slideshow with Picasso

I'm displaying multiple images from our server as a slideshow with a ImageSwitcher. Before the ImageSwitcher gets initialized I want to preload the images with Picasso library.
I want to say that I use Picasso with an interceptor, because our server requires Basic Authentication for the images.
My current preloading:
final int[] downloadedCounter = {0};
for (int i = 0; i < images.size(); i++) {
final SlideshowImage image = images.get(i);
PicassoUtils.getPicassoWithBasicAuthorizationFrom(user, getContext())
.load(image.getImageUrl())
.fetch(new Callback() {
#Override
public void onSuccess() {
downloadedCounter[0]++;
if (downloadedCounter[0] == images.size()) {
callback.downloadFinished();
}
}
#Override
public void onError() {
}
});
}
And that is my ImageSwitcher:
ImageView image = (ImageView) this.getNextView();
PicassoUtils.getPicassoWithBasicAuthorizationFrom(user, getContext())
.load(imageUrl)
.noFade()
.into(image, new Callback() {
#Override
public void onSuccess() {
showNext();
}
#Override
public void onError() {
}
});
But the problem is, that it won't get cached, because when I use .networkPolicy(NetworkPolicy.OFFLINE) on Picasso in my ImageSwitcher nothing gets loaded.
And everytime i call showNext() in my ViewSwitcher the used memory of the device rises a bit.