67.5 Reading the Content of a File

The exact steps required to read the content of a file hosted by a document provider will depend to a large extent on the type of the file. The steps to read lines from a text file, for example, differ from those for image or audio files.

An image file can be assigned to a Bitmap object by extracting the file descriptor from the Uri object and then decoding the image into a BitmapFactory instance. For example:

ParcelFileDescriptor pFileDescriptor =

            getContentResolver().openFileDescriptor(uri, "r");

 

FileDescriptor fileDescriptor =

            pFileDescriptor.getFileDescriptor();

 

Bitmap image = BitmapFactory.decodeFileDescriptor(fileDescriptor);

 

pFileDescriptor.close();

 

myImageView.setImageBitmap(image);

Note that the file descriptor is opened...