facebook

package com.pedometer;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.widget.Toast;

import com.facebook.android.DialogError;
import com.facebook.android.Facebook;
import com.facebook.android.Facebook.DialogListener;
import com.facebook.android.FacebookError;

public class ShareOnFacebook extends Activity{

	private static final String APP_ID = "106320872838957"; //322797887779966
	private static final String[] PERMISSIONS = new String[] {"publish_stream"};

	private static final String TOKEN = "access_token";
	private static final String EXPIRES = "expires_in";
	private static final String KEY = "facebook-credentials";

	private Facebook facebook;
	private String messageToPost;

	public boolean saveCredentials(Facebook facebook) {
        	Editor editor = getApplicationContext().getSharedPreferences(KEY, Context.MODE_PRIVATE).edit();
        	editor.putString(TOKEN, facebook.getAccessToken());
        	editor.putLong(EXPIRES, facebook.getAccessExpires());
        	return editor.commit();
	}

	public boolean restoreCredentials(Facebook facebook) {
		SharedPreferences sharedPreferences = getApplicationContext().getSharedPreferences(KEY, Context.MODE_PRIVATE);
		facebook.setAccessToken(sharedPreferences.getString(TOKEN, null));
		facebook.setAccessExpires(sharedPreferences.getLong(EXPIRES, 0));
		return facebook.isSessionValid();
	}

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		facebook = new Facebook(APP_ID);
		restoreCredentials(facebook);

		requestWindowFeature(Window.FEATURE_NO_TITLE);

		setContentView(R.layout.facebook_dialog);

		String facebookMessage = getIntent().getStringExtra("facebookMessage");
		if (facebookMessage == null){
			facebookMessage = Pedometer.facebookText;
		}
		messageToPost = facebookMessage;
	}

	public void doNotShare(View button){
		finish();
	}

	public void share(View button){
		if (! facebook.isSessionValid()) {
			loginAndPostToWall();
		}
		else {
			postToWall(messageToPost);
		}
	}

	public void loginAndPostToWall(){
		 facebook.authorize(this, PERMISSIONS, Facebook.FORCE_DIALOG_AUTH, new LoginDialogListener());
	}

	public void postToWall(String message){
		Bundle parameters = new Bundle();
		parameters.putString("message", message);
		parameters.putString("description", "topic share");
		try {
			facebook.request("me");
			String response = facebook.request("me/feed", parameters, "POST");
			Log.d("Tests", "got response: " + response);
			if (response == null || response.equals("") ||
					response.equals("false")) {
					showToast("Blank response.");
			}
			else {
				showToast("Message posted to your facebook wall!");
			}
			finish();
		}
		catch (Exception e) {
			showToast("Failed to post to wall!");
			e.printStackTrace();
			finish();
		}
	}

	class LoginDialogListener implements DialogListener {
	    public void onComplete(Bundle values) {
	    	saveCredentials(facebook);
	    	if (messageToPost != null){
			postToWall(messageToPost);
	    	}
	    }
	    public void onFacebookError(FacebookError error) {
	    	showToast("Authentication with Facebook failed!");
	        finish();
	    }
	    public void onError(DialogError error) {
	    	showToast("Authentication with Facebook failed!");
	        finish();
	    }
	    public void onCancel() {
	    	showToast("Authentication with Facebook cancelled!");
	        finish();
	    }
	}

	private void showToast(String message){
		Toast.makeText(getApplicationContext(), message, Toast.LENGTH_SHORT).show();
	}
}