java - will Camera.Parameters:: setRotation rotate the image taken by samsung s2 camera? -

galaxy s2 takes portrait photos , add them oritentation_rotation_90 exif tag.

thus when upload photo server presented in landscape.

i'm using min api 8.

i'm confused, , i'll appreciate if explain.

1) have tried:

     exifinterface exif;         try {           exif = new exifinterface(imagefilename);           int orientation =               exif.getattributeint(exifinterface.tag_orientation, exifinterface.orientation_normal);           exif.setattribute(exifinterface.tag_orientation,               string.valueof(exifinterface.orientation_rotate_270)); //also tried exifinterface.orientation_rotate_undefined)           exif.saveattributes();           orientation =               exif.getattributeint(exifinterface.tag_orientation, exifinterface.orientation_normal);           boolean b = orientation == configuration.orientation_landscape;          } catch (ioexception e) {           // todo auto-generated catch block           e.printstacktrace();         } 

but didn't help. attributes changed, image still in landscape.

2) current solution:

create new rotated bitmap in client side.

but might costly.

3) suggested solution:

camera.parameters:: setrotation

... camera driver may rotate picture , exif thumbnail. if jpeg picture rotated, orientation in exif header missing or 1 (row #0 top , column #0 left side).

and saw code:

public void onorientationchanged(int orientation) {    if (orientation == orientation_unknown) return;     int rotation = activity.getwindowmanager().getdefaultdisplay()          .getrotation();    int degrees = 0;    switch (rotation) {      case surface.rotation_0: degrees = 0; break;      case surface.rotation_90: degrees = 90; break;      case surface.rotation_180: degrees = 180; break;      case surface.rotation_270: degrees = 270; break;    }     parameters.setrotation(degrees );    mcamera.setparameters(parameters); } 

will (3) work needs?

another friend in stackoverflow said (2) work me

but couldn't understand why.