Android Async Task Progress Bar onProgressUpdate

Question

I am a new programmer. I have seen lots of tutorials but can\'t understand what is wrong. I am trying to create a ProgressBar from an Async Task. However it always crashes m

Answer 1

Intervals.getApp().progressBar.setProgress(values[0]);

There are two possibilities for the NullPointerException in this line of code:

1. getApp() returns null
2. progressBar is null

In order to determine which is the cause, you need to split this into two separate lines:

Intervals intervals = Intervales.getApp();
intervals.progressBar.setProgress(values[0]);

Now set a breakpoint at the first line, step over it, and determine if intervals is null or not.