Question

I use below method to view image in gridview.
Reference

String[] projection = {MediaStore.Images.Thumbnails._ID};  
Cursor cursor = managedQuery( MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, projection, null, null, null);

It show the image which had thumbnail in sdcard.
But I want to show all the images in sdcard, not only the thumbnail exist one.
Is there any method to make the Android System to create the thumbnail for MediaStore.Images.Thumbnails._ID use?

Answer 1

first, the url MediaStore.Images.Media.EXTERNAL_CONTENT_URI can return all images,
and then MediaStore.Images.Thumbnails has method:

public static Bitmap getThumbnail (ContentResolver cr, long origId, long groupId, int kind, BitmapFactory.Options options)
// origid  is the Images.ImageColumns._ID
//groupid is the Images.ImageColumns.BUCKET_ID 

can return the thumbnails.