问题
I want to download an image from facebook but my Bitmap is always null.
[
private void extractFacebookIcon(String id)
{
Bitmap bitmap = null;
InputStream in = null;
try
{
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy( policy );
URL imageURL = new URL("http://graph.facebook.com/"+id+"/picture?type=large");
in = ( InputStream) imageURL.getContent();
bitmap = BitmapFactory.decodeStream( in );
mFacebookIcon = bitmap;
}
catch(Throwable e)
{
}]
When I use http://graph.facebook.com/"+id+"/picture?type=large in browser, my Chrome redirects me on this link and the picture is opening and bitmap can read it.
("https://fbcdn-profile-a.akamaihd.net/hprofile-ak-frc3/t1.0-1/c0.0.1.00.1.00/p100x100/969878_592016040843290_1511913922_t.jpg)
How to solve this problem and read the first link then bitmap was not null?
回答1:
I think it's because Facebook send your application a redirect to another URl. Have a look at http://www.mkyong.com/java/java-httpurlconnection-follow-redirect-example/ to see how you can handle redirects (HttpRedirectExample code).
来源：https://stackoverflow.com/questions/23055669/how-to-download-image-from-facebook-graph-api