Post message to facebook wall from android fb sdk always error

问题

I have problem with fb sdk for Android (downloaded from http://github.com/facebook/facebook-android-sdk). Tried to post wall but always get error (permission already set and logged in to fb)

here is the code snippet onClick function, i made small modifications on their sample code:

Bundle params = new Bundle();

params.putString("message", "Test");
params.putString("name", "American Virgin");
params.putString("link", "http://bit.ly/12345");
params.putString("description", "A Freshman College Girl on a scholarship from an ...");
params.putString("picture", "http://xxx/MOV1026.jpg");

mAsyncRunner.request("me/feed", params, "POST", new TestRequestListener());

From DDMS i get the following error:

    09-16 18:55:28.372: WARN/Bundle(14392): Key picture expected byte[] but value was a java.lang.String.  The default value <null> was returned.
09-16 18:55:28.414: WARN/Bundle(14392): Attempt to cast generated internal exception:
09-16 18:55:28.414: WARN/Bundle(14392): java.lang.ClassCastException: java.lang.String
09-16 18:55:28.414: WARN/Bundle(14392):     at android.os.Bundle.getByteArray(Bundle.java:1220)
09-16 18:55:28.414: WARN/Bundle(14392):     at com.facebook.android.Util.openUrl(Util.java:153)
09-16 18:55:28.414: WARN/Bundle(14392):     at com.facebook.android.Facebook.request(Facebook.java:295)
09-16 18:55:28.414: WARN/Bundle(14392):     at com.facebook.android.AsyncFacebookRunner$2.run(AsyncFacebookRunner.java:209)
09-16 18:55:28.422: WARN/Bundle(14392): Key message expected byte[] but value was a java.lang.String.  The default value <null> was returned.
09-16 18:55:28.432: WARN/Bundle(14392): Attempt to cast generated internal exception:
09-16 18:55:28.432: WARN/Bundle(14392): java.lang.ClassCastException: java.lang.String
09-16 18:55:28.432: WARN/Bundle(14392):     at android.os.Bundle.getByteArray(Bundle.java:1220)
09-16 18:55:28.432: WARN/Bundle(14392):     at com.facebook.android.Util.openUrl(Util.java:153)
09-16 18:55:28.432: WARN/Bundle(14392):     at com.facebook.android.Facebook.request(Facebook.java:295)
09-16 18:55:28.432: WARN/Bundle(14392):     at com.facebook.android.AsyncFacebookRunner$2.run(AsyncFacebookRunner.java:209)
09-16 18:55:28.452: WARN/Bundle(14392): Key format expected byte[] but value was a java.lang.String.  The default value <null> was returned.
09-16 18:55:28.472: WARN/Bundle(14392): Attempt to cast generated internal exception:
09-16 18:55:28.472: WARN/Bundle(14392): java.lang.ClassCastException: java.lang.String
09-16 18:55:28.472: WARN/Bundle(14392):     at android.os.Bundle.getByteArray(Bundle.java:1220)
09-16 18:55:28.472: WARN/Bundle(14392):     at com.facebook.android.Util.openUrl(Util.java:153)
09-16 18:55:28.472: WARN/Bundle(14392):     at com.facebook.android.Facebook.request(Facebook.java:295)
09-16 18:55:28.472: WARN/Bundle(14392):     at com.facebook.android.AsyncFacebookRunner$2.run(AsyncFacebookRunner.java:209)

回答1:

That's really weird... I have an app which uses the same syntax but it works really well. I just check the source code of the FB SDK and it seems it has changed a lot... I found this on the SDK src:

    for (String key : params.keySet()) {
        if (params.getByteArray(key) != null) {
                dataparams.putByteArray(key, params.getByteArray(key));
        }
    }

So, you try to do this:

Bundle params = new Bundle();

params.putByteArray("message", "Test".getBytes());
params.putByteArray("name", "American Virgin".getBytes());
params.putByteArray("link", "http://bit.ly/12345".getBytes());
params.putByteArray("description", "A Freshman College Girl on a scholarship from an ...".getBytes());
params.putByteArray("picture", "http://xxx/MOV1026.jpg".getBytes());

mAsyncRunner.request("me/feed", params, "POST", new TestRequestListener());

回答2:

The fix is:

if (parameters.get(key) instanceof byte[]) {

instead of

if (parameters.getByteArray(key) != null) {

on line 63 of Util.java.

And

if (params.get(key) instanceof byte[]) {

instead of

if (params.getByteArray(key) != null) {

on line 155 of Util.java.

For some strange reason, on Samsung Nexus S (perhaps other devices too) it returns a String, not a byte[].

回答3:

I think the error message is quite clear... "Key picture expected byte[] but value was a java.lang.String."

The value for the key "picture" in your Bundle params should be a byte array, not a String.

edit: Didn't read Cristian's answer. I'm pretty sure you should pass along the actual image data, not the filename in bytes. But I could be wrong.

another edit: Yeah, so I'd downvote my own answer if I could, but it seems I didn't even read the question properly. The error happens not just for picture, so I have no idea what's wrong...

来源：https://stackoverflow.com/questions/3726429/post-message-to-facebook-wall-from-android-fb-sdk-always-error

标签

android

facebook

facebook-wall