Storing bitmaps on an SD card reduces image quality… here is a solution to the problem.
Storing bitmaps on an SD card reduces image quality
I’m storing bitmaps in an SD card while retrieving the quality that lost them. How do I fix this. Below is the code I store the bitmap in an SD card.
public void saveExternalPrivateStorage(File folderDir, String fname,
Bitmap bitmap) {
File file = new File(folderDir, fname);
if (file.exists()) {
file.delete();
}
if ((folderDir.mkdirs() || folderDir.isDirectory())) {
try {
FileOutputStream out = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 0, out);
out.flush();
out.close();
System.out.println("Stored");
System.out.println(file.getAbsolutePath());
System.out.println("Stored");
} catch (Exception e) {
e.printStackTrace();
}
}
}
Call this method:
File folderDir= new File(getActivity().getExternalFilesDir("myfolder"),"/images");
storeImagesIndevices.saveExternalPrivateStorage(folderDir,filename,imgBitmapUrls.get(i));
Retrieve from SD card:
Bitmap bitmap2 = BitmapFactory.decodeFile(folderDir+"/"+data.getTid());
dbimgBitmapUrls.put(data.get_tid()-1, bitmap2);
Thank you very much….
Solution
bitmap.compress(Bitmap.CompressFormat.JPEG, 0, out);
JPEG is a lossy compression format, and you have set the quality parameter to 0%. Around 70% is usually a good compromise between file size and image quality:
bitmap.compress(Bitmap.CompressFormat.JPEG, 70, out);
Or use a lossless format where quality parameters don’t matter, such as PNG:
bitmap.compress(Bitmap.CompressFormat.PNG, 0, out);
Can store the bitmap in SQLite? is it good approach. In my case number of images not that much
You can, but you shouldn’t. A better approach is to store the image as a file and the path in a database.