Simple example of how to post a message using the Facebook SDK. I'm assuming that the user is already logged in.

gistfile1.java

Context context = this.getApplicationContext();
Facebook facebook = new Facebook(YOUR_FACEBOOK_ID);
AsyncFacebookRunner facebookAsync = new AsyncFacebookRunner(facebook);
Handler facebookHandler = new Handler();
SessionStore.restore(facebook, context);

Bundle params = new Bundle();
params.putString("message", "This is my message.");

facebookAsync.request("me/feed", params, "POST", new RequestListener() {
	public void onMalformedURLException(MalformedURLException e) {}
	public void onIOException(IOException e) {}
	public void onFileNotFoundException(FileNotFoundException e) {}
	public void onFacebookError(FacebookError e) {
		facebookHandler.post(new Runnable() {
			public void run() {
				Toast.makeText(context, "Error when posting the message.", Toast.LENGTH_LONG).show();
			}
		});
	}
	public void onComplete(String response) {
		facebookHandler.post(new Runnable() {
			public void run() {
				Toast.makeText(context, "Message published!", Toast.LENGTH_LONG).show();
			}
		});
	}
});