What data is returned when using ACTION_IMAGE_CAPT

问题:

I'm getting a bit confused from this description:

The caller may pass an extra EXTRA_OUTPUT to control where this image will be written. If the EXTRA_OUTPUT is not present, then a small sized image is returned as a Bitmap object in the extra field. This is useful for applications that only need a small image. If the EXTRA_OUTPUT is present, then the full-sized image will be written to the Uri value of EXTRA_OUTPUT.

With NO EXTRA_OUTPUT, it will return a "small sized image"?

With EXTRA_OUTPUT, it will return a full sized image?

"Is returned as a Bitmap object in the extra field"...

On my onActivityResult, I was just using Intent data as the actual data. Am I supposed to be using data.getExtra or something?

回答1:

In the case you provide an Uri:

Intent action = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
action.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, myUri); 
startActivityForResult(action, CAMERA_RESULT);

and then you retrieve it with (after the tests on requestCode and resultCode):

Bitmap bitmap = BitmapFactory.decodeFile(myUri, options); 

In the other case:

Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
startActivityForResult(intent, CAMERA_RESULT); 

and your retrieve it with:

Bundle bundle = intent.getExtras(); 
Bitmap bitmap = (Bitmap) extras.get("data"); 

回答2:

Here is an expansion of my comment. This snippet of code worked well for me in giving me the pixel data - getting grayscale data and imageview is in my post here

@Override
        public void onClick(View v) {



            Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);

            startActivityForResult(Intent.createChooser(intent, "Select Picture"), CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);

            }

    });

}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    //super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE && resultCode == RESULT_OK) {
            final ContentResolver cr = getContentResolver();
                    final String[] p1 = new String[] {
                            MediaStore.Images.ImageColumns._ID,
                            MediaStore.Images.ImageColumns.DATE_TAKEN
                    };
                    Cursor c1 = cr.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, p1, null, null, p1[1] + " DESC");
                    if ( c1.moveToFirst() ) {
                        String uristringpic = "content://media/external/images/media/" +c1.getInt(0);
                        Uri uri = Uri.parse(uristringpic);
                        try {
                            Bitmap bm = android.provider.MediaStore.Images.Media.getBitmap(cr, uri);

Hope this helps