Android, java code for opening facebook profile of a user in the facebook application, if the user has it installed, or open the profile in the web browser.

FacebookIntent.java

/*
* Go to https://graph.facebook.com/<user_name_here>
* Copy your id
* This will open up facebook app if the user has it installed
* Otherwise it will open facebook in the browser
*/

public Intent getOpenFacebookIntent(Context context) {
  try {
    context.getPackageManager().getPackageInfo("com.facebook.katana", 0);
    return new Intent(Intent.ACTION_VIEW, Uri.parse("fb://profile/<id_here>"));
  }
  catch (Exception e) {
    return new Intent(Intent.ACTION_VIEW, Uri.parse("https://www.facebook.com/<user_name>"));
  }
}