Develop Reference

Load Image from URL in Android

I'm trying to load an image from the following url:
https://fangkarte.de:8080/fangfisch/file/files/592036af55dfffca0155e01fe10002f7
In Chrome/IE the image will be displayed without problems. When I try to load the image on Android I am not able to store the image as an PNG file. Everytime the image will be saved as a textfile which contains the image as base64 String.
Also I tried the following code but the decodedByte is null:
byte[] decodedString = Base64.decode(encodedImage, Base64.DEFAULT);
Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
Does anyone have an idea how I can show my image from the url as an bitmap or which I prefer to store the image on the device as an png?

Use Universal Image Loder to upload image from Url
Download universal image loder and add to your lib folder and
Implement the below code where you want to load image
ImageLoader imageLoader = ImageLoader.getInstance();
imageLoader.init(ImageLoaderConfiguration.createDefault(context));
DisplayImageOptions options = new DisplayImageOptions.Builder().cacheInMemory(true)
.cacheOnDisc(true).resetViewBeforeLoading(true)
.showImageForEmptyUri(R.drawable.noimage)
.showImageOnFail(R.drawable.icon3)
.showImageOnLoading(R.drawable.loading).build();
imageLoader.displayImage(url, imageview, options);

For handling images, Use Picasso , Glide , Universal image loader, Volley or Fresco
Eg, in picasso, you will be able to load images, store them in memory cache and handle cancellations in listviews/recyclerviews etc...
Picasso.with(context).load("https://fangkarte.de:8080/fangfisch/file/files/592036af55dfffca0155e01fe10002f7").placeholder("someimagetillyourimagedownloads).into(R.id.yourimageview);
Picasso: https://github.com/square/picasso
Glide: https://github.com/bumptech/glide
Fresco: https://github.com/facebook/fresco ( I use this after extensively testing all 3 except volley )
UIL: https://github.com/nostra13/Android-Universal-Image-Loader
Similar things can be done using all the above libraries.
I highly recommend not trying to handle images on your own. It can turn into quite a mess if you are a novice android dev.

The image you download is much to big ((860.000 bytes)) to make a Bitmap out of it. So BitmapFactory will return null.
Scale image down before use.

How to load a bitmap into an image-view with Picasso

Yes, I am using Picasso to load a bitmap. The reason is I am decoding URIs in one part of my adapter, and loading bitmaps in another, and I read here that
You should always call Picasso, even if your URL is null. This way it knows that the image view was recycled.
So I tried this....
Bitmap bitMap;
...
Picasso.with(getContext())
.load(bitMap)
.into(imageView);
But I got this error
cannot resolve method 'load(android.graphics.Bitmap)'

You cant put Bitmap for load method of Picasso. You can use only uri , file , url path and int resource id.
If You are downloading image from url then you can do like as below code:
String url = "your_url";
Picasso.with(context).load(url)
.placeholder(R.drawable.any_drawable)
.error(R.drawable.anydrawable).into(your_imageView);
For other resource its same, only load method parameter would gets changed depending on the resource you are using.

Using android square's picasso only for caching and decoding

I would like to use Picasso (https://github.com/square/picasso) for caching and bitmap decoding, the problem i'm having is that my request is for a url like for example : server.com/component/1 which gives me a proto file that i parse that contains some other information and a bytestring of the image that i decode to a bitmap.
Is there a way to use picasso for this even thought the request url is not just for an image or just use it for caching and decoding my bitmaps, I've tried using the class Target but it works only with a url of an image alone.
Thanks.

I think it's not possible, what can you do is just caching, load method has only 4 overrides for Uri, String, Bitmap, int. So when you will use Bitmap as a parameter, you will be able to cache your bitmap. Picasso was created only as an image loader, so I don't think that it has method that received all data from the server.

How to just download a image by picasso library?

I'm using picasso library to download images from URL.What I need is just download the stream not a bitmap, but there is no such method in it.Is it true?
There is :
Picasso.with(this).load(URL_LONG).get(); // return bitmap
Sometimes there are some large images from URL.I need to handle them before displaying for avoiding out of memory.So I cannot load them into bitmap immediately.This is the reason i need the stream.

There is already a feature to provide what you need in Picasso Library. You can actually scale the image when you stream it. Check out this SOF Question.

Save image to sdcard from imageview

I have listview having customized some textview and one imageview. When I long click on item I have store that item information to the database but the question is how to store image in sdcard and store the relevant path to the database. The image alread download as cache now I don't want to re-download that image.
Is there way to store that Image to the sdcard.
I am using this example to download the images for listview https://github.com/thest1/LazyList
Edit
I got solution
no need to extra process when using this example. Just store the web path of image into the database and pass that imageview into the ImageLoader object with path it'll use the cache images if the image was exist for same URL

No Need to extra process, Using this example it'll will care for future usage also for same URL of image. This will get from the cache directory if the image found that use that image otherwise download it and then use it.

If you use Prime the caching will be transparent, when you request the image again it will grab it from a memory cache if available or a disk cache automatically. It also is really easy to get images with.

You can save your bitmap which you get via Bitmap bitmap=memoryCache.get(url); using save-file-to-sd-card.
You can also get the bitmap from the ImageView(if you want) like:
//say your ImageView object is i;
i = (ImageView) findViewById(R.id.img);
Drawable d = i.getBackground();
Bitmap bitmap = ((BitmapDrawable)d).getBitmap();