Develop Reference

Take screen shot from web view in android

I have a web view that I need to take a screenshot from a site. People suggested me use the function capturePicture(), this function is deprecated. So I create bitmap from current site like this and save it as byte[ ] to the database:
Bitmap bitmap = Bitmap.createBitmap(view.getWidth(), view.getWidth(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
view.draw(canvas);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 10, stream);
DatabaseHelper.updateData(id, stream.toByteArray());
bitmap.recycle();
And load it in another Activity with Glide:
Glide.with(context).load(items.get(position).getImage())
.placeholder(R.drawable.ic_defualt)
.into(holder.ivShot);
Now, If the number of screenshots increases, The speed of the app decreases and Memory size increases. I know that the issue of bitmaps is very complicated, But there must be a way to take a picture of the web view without any memory leaks or slowdowns.
I try to use threads to get bitmap but it doesn't help. Anyone know How I can do it?

View.draw(canvas) poor quality of child views

I am trying to solve problem when I get bitmap from view (with bad quality of childviews) and store it as PNG. There are some taken pictures using this code:
Bitmap b = Bitmap.createBitmap(
Math.round(General.getDisplayWidthPx()), Math.round(General.getDisplayHeightPx()), Bitmap.Config.ARGB_8888);
final Canvas canvas = new Canvas( b );
wallFrame.invalidate();
wallFrame.draw( canvas );
FileOutputStream out = new FileOutputStream(file);
b.compress(Bitmap.CompressFormat.PNG, 100, out);
out.flush();
out.close();
When the childview is small the quality of childview is terrible.
But when it's larger the quality is better.
As you can see the smaller the picture, the lower the quality. I also tried deprecated methods:
wallFrame.setDrawingCacheEnabled(true);
Bitmap b = wallFrame.getDrawingCache();
wallFrame is ZoomLayout which extends RelativeLayout. Child views in wallFrame are SubScalingImageView which extends View. I think it's not caused by SubScalingImageView I've tried standard ImageView and result was the same. When I take screenshot of app, the result is better.
Pictures are loaded from user storage using Uri (so not from drawable). SubscalingImageView has own decoders. In app the quality of pictures is perfect.
I think problem is somewhere in view.draw(canvas). But I have no idea how to edit it to make it work.
I appreciate every idea. Thank you!

Android - store image on a temp file cross-activity

In the app I am developing, I have an activity in which I show two ImageViews made of two bitmaps, ca.bm and ca.tempBm respectively. It works fine on my device but produces OutOfMemoryError on some devices when trying to copy the original bitmap to the bitmap I will modify later:
ca.tempBm = Bitmap.createBitmap(ca.bm); // out of memory error
I would like to create a temp file instead to hold the original image and work with a single bitmap, but the temp file must be preserved when changing from the Camera Activity to the next activity and should be destroyed only when the second activity does.
How can I achieve this?

You can write a Bitmap to the cache directory with:
FileOutputStream outStream = new FileOutputStream(new File(getCacheDir(), "tempBMP"));
myBitmap.compress(Bitmap.CompressFormat.JPEG, 75, outStream);
outStream.close();
And read back in with:
Bitmap myBitmap = BitmapFactory.decodeFile(bitmapPath.getAbsolutePath());
But you might be better off just saving memory by creating a smaller Bitmap, drawing the larger Bitmap to the smaller Bitmap's canvas, then passing around the smaller Bitmap between Activities.

Decreasing File Size of Image From ImageView

I use the following code to obtain a bitmap from an ImageView. This image is not saved anywhere else on my device. I want to upload this image into an online mysqli database. However, to do so I need to decrease the size of the file first. I found a lot of links about this, however they all require the file to be saved on the device and then use FileOutputStream. I am looking for a way to reduce the file size so that it can be comfortably transferred using the Volley API ( i am currently receiving either run out of memory exceptions or broken pipe errors). Hence I am looking for a way to modify this code to be able to significantly decrease the file size, whilst still maintaining a quality which can be comfortably shown on a mobile device. The original image is taken straight from the camera hence the size is quite large. Here is my code:
ImageView pic_holder = (ImageView) findViewById(R.id.picturedisplay);
Bitmap bitmap = ((BitmapDrawable)pic_holder.getDrawable()).getBitmap();
ByteArrayOutputStream stream=new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 90, stream);
byte[] image=stream.toByteArray();
String img_str = Base64.encodeToString(image, 0);
I would like to decrease the size of the img_str which is passed to my Volley method.

Android - Load and save bitmap without increase destination file size

I have a problem in saving images in my app.
The process is simple:
1 - I read the image into a bitmap for display
2 - Save the bitmap as a new file
At this point, I do not understand why the final file has a size much larger than the original image. For example, a 170 kb image is saved in a new file 1 mb.
I know the difference in the management of compression between PNG and JPG, but I expect that if I read a PNG file, and save it in the same format, the size remains the same.
Thank you all for the help.
Edit
This is my code for saving method:
Bitmap resized = Bitmap.createScaledBitmap(original, generateWidth, generateHeight, false);
FileOutputStream out = new FileOutputStream(tempResizedFile.getPath());
resized.compress(generateType.CompressFormat(),
qualityBar.getProgress(), out);
out.close();