Develop Reference

Apply android Picasso library to Sqlite decodeByteArray image

I'm using Sqlite to save images and this is the code I use to bring they back to a simple imageView:
byte[] bookImage = books.getImage();
Bitmap bitmap = BitmapFactory.decodeByteArray(bookImage, 0, bookImage.length);
holder.imageView.setImageBitmap(bitmap);
Now I'm trying to use the Picasso library to prevent a 'Out Of Memory' crash.
This is the code:
Picasso.with(holder.imageView.getContext()).load(bitmap).into(holder.imageView);
Unfortunately i cannot use load(bitmap). How can i use the Picasso library correctly for this?

You could use Glide for this:
Glide.with(holder.imageView.getContext()).load(bookImage).asBitmap().into(holder.imageView);

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.

what is the best way to work with Images in SqLite android?

I am working with a customizable database with pictures. Right now I am taking pictures as it is from the sdcard and encoding it in base64 String and then putting it in the database. but whenever I am trying decoding it and showing it in my view, I am getting Out of memory error. Can any one one tell me what is the best procedure to do it? Shall I change the size of the pictures before encoding it?
I want to re-size all of the pictures into 512*512.

Image to Base64 is very heavy operation in android. Consider saving the images on the external/internal memory and save the file path in the sqlite database.

You can convert your image to byte array then store values in sql by using BLOB type and vice versa.

As you mentioned you want to resize the images to 512*512, you can scale the image using below code,
Create bitmap from captured image and then use below line
Bitmap resizedBitmap = Bitmap.createScaledBitmap(myBitmap, 512, 512, false);
It will give you a smaller image, you can also consider compressing the image to reduce in size,
OutputStream imagefile = new FileOutputStream("/your/file/name.jpg");
// Write 'bitmap' to file using JPEG and 50% quality hint for JPEG:
bitmap.compress(CompressFormat.JPEG, 50, imagefile);
Now, you have two options,
Save the scaled and compressed image into a file and save the path of that file in db. (Better way)
Convert the scaled and compressed image to base64 string and save in db.

Althought base64 is , as many answers said, a heavy operation for android, if done properly, it should not be a problem.
There are many reasons a bitmap could be required to be saved to a DB , (photo of a invoice ticket, for example?), and this is the way i do it.
first, create a new , smaller bitmap like #Swapnil commented.
and second, correctly use the bitmap transformation methods, i've been using these (look below) two so far and haven't had any memory issue on many different devices.
link to my BitmapUtils transformation methods

Creating Image instance from drawable images in android

i am creating digital signature app using iTextG jar, to add water mark on the signature field, iText's
appearance.setImage(Image.getInstance(signedImagePath));
Requires a path of the watermark image, i want to use image from drawable folder of android, kindly suggest me i am not getting how to create Image instance from drawable, suggest if any other option is there?

You use ImageInstance something like this.
Bitmap bitmap = BitmapFactory.decodeResource(getBaseContext().getResources(),R.drawable.yourimage);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100 , stream);
Image myImg = Image.getInstance(stream.toByteArray());
Hope this helped.

http://developer.android.com/reference/android/graphics/BitmapFactory.html#decodeResource(android.content.res.Resources, int, android.graphics.BitmapFactory.Options)

Android: I created a bitmap from canvas and save it to "sdcard/folder/subfolder" but I couldn't decode it to a image view

I've created a bitmap from canvas. Save it to my "/sdcard/folder/subfolder/file.png"
I want to get this png file into imageview after saving it. I tried this by using BitmapFactory.decodeFile("/sdcard/folder/subfolder/file.png"); method. But it returned nothing. There is no image on imageview.
Do you have any idea?

Try using
String filePath = Environment.getExternalStorageDirectory()+"/folder/subfolder/file.png";//or "folder/subfolder.."