http://stackoverflow.com/questions/10165302/dialog-to-pick-image-from-gallery-or-from-camera

7 down vote accepted below code can be use for takeing oand picking photo and for selection of eiher pick photo or take photo just show a dialog with two option and upon selection use the appropriate code …

to take picture from camera.

Intent takePicture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(takePicture, 0);//zero can be replced with any action code

to pick photo from gallery

  Intent pickPhoto = new Intent(Intent.ACTION_PICK,
           android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
  startActivityForResult(pickPhoto , 1);//one can be replced with any action code

onactivity result code::

        protected void onActivityResult(int requestCode, int resultCode,
			Intent imageReturnedIntent) {
		super.onActivityResult(requestCode, resultCode, imageReturnedIntent);
		switch (requestCode) {
		case 0:
			if (resultCode == RESULT_OK) {
				Uri selectedImage = imageReturnedIntent.getData();
				imageview.setImageURI(selectedImage);
			}
			break;
		case 1:
			if (resultCode == RESULT_OK) {
				Uri selectedImage = imageReturnedIntent.getData();
				imageview.setImageURI(selectedImage);
			}
			break;
		}
	}

И необходимые права в файле манифеста

 <uses-permission android:name="android.permission.CAMERA" />
 <uses-feature android:name="android.hardware.camera" />
 <uses-feature android:name="android.hardware.camera.autofocus" />
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />