Question

I’m trying to pass 2 variables through a couple of Android Activities. One of them keeps turning up as null on the last page:

The first Activity:

Intent intent= new Intent(RoundOptionActivity.this, MoveOptionActivity.class);
intent.putExtra("numRounds", "5");
startActivity(intent);

The second Activity:

Bundle extras = getIntent().getExtras(); 
if(extras !=null) {
    numRounds = Integer.parseInt(extras.getString("numRounds"));
}

.........

Intent intent = new Intent(MoveOptionActivity.this, MoveActivity.class);
intent.putExtra("numRounds", numRounds);
intent.putExtra("playerChoice", playerChoice);
startActivity(intent);

(Note that at this point I printed numRounds in LogCat and it was set to the right number, and not null)

The Third Activity:

Bundle extras = getIntent().getExtras(); 
if(extras !=null) {
    playerChoice = Integer.parseInt(extras.getString("playerChoice"));
    numRounds = Integer.parseInt(extras.getString("numRounds"));
}

At this point, the application crashes at the line where I try to parse numRounds to an integer, with a NumberFormatException complaining that it can’t parse a null value. There’s never a problem with playerChoice, only numRounds. I’ve tried handling numRounds the exact same way as playerChoice, but nothing seems to work. What’s going on? D:

Answer 1

You have to use extras.getInt("numRounds");

because in second Activity you added to putExtra int value:

numRounds = Integer.parseInt(extras.getString("numRounds"));