Android: imageview and bitmap

Imageview. setimagebitmap (Bitmap)

Obtain bitmap from Res:

Bitmap bitmap = bitmapfactory. decoderesource (getresources (), R. drawable. XXX );

Obtain bitmap from bytearray:

Bitmap bitmap = bitmapfactory. decodebytearray (data, 0, Data. Length );

Obtain bitmap from a file:

Bitmap bitmap = bitmapfactory. decodefile (file_path );

Bitmapregiondecoder:

Parcelfiledescriptor filedescriptor = parcelfiledescriptor. Open (
File, parcelfiledescriptor. mode_read_only );

Bitmapregiondecoder decoder = bitmapregiondecoder. newinstance (filedescriptor. getfiledescriptor (), false );
Bitmap bitmap = decoder. decoderegion (New rect (0, 0, decoder. getwidth (), decoder. getheight (), null );

The problem of distortion in the Image view when the image is converted to bitmap:

Add options attributes

Options opts = new options ();

Opts. indensity = displaymetrics. density_default;

Bitmap bitmap = bitmapfactory. decodefile (file_path, opts );

Bitmap bitmap = bitmapfactory. decodebytearray (data, 0, Data. length, opts );