Check if extras are set or not

Question

Is there any way to check if an extra has been passed when starting an Activity?

I would like to do something like (on the onCreate() in the Activity):

    Bundle extras = getIntent().getExtras();     String extraStr = extras.getString("extra");      if (extraStr == null) {         extraStr = "extra not set";     } 

But this is throwing a java.lang.NullPointerException.

Thank you.

Answer 1

Use the Intent.hasExtra(String name) to check if an extra with name was passed in the intent.

Example:

Intent intent = getIntent();  if (intent.hasExtra("bookUrl")) {     bookUrl = b.getString("bookUrl"); } else {    // Do something else } 

Also, use Intent.getStringExtra(String name) directly on the intent to handle the NullPointerException if no extras were passed.

Answer 2

Well, I had similiar problem. in my case the null point exception was happen when I checked if my bundle.getString() was equall to null.

here is how IN MY CASE I solved it:

Intent intent = getIntent();             if(intent.hasExtra("nomeUsuario")){         bd = getIntent().getExtras();         if(!bd.getString("nomeUsuario").equals(null)){             nomeUsuario = bd.getString("nomeUsuario");         }     }