Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Android Android Lists and Adapters (2015) Using Parcelable Data Retrieving Parcelable Data

Linton Mackereth
Linton Mackereth
4,764 Points
Posted by Linton Mackereth
Linton Mackereth
4,764 Points

NullPointerException

Hi, I have received a Null Pointer Exception, when I click the 7 day button after implementing the Parcelable methods. The Log hints this relates to 

Parcelable[] parcelables = intent.getParcelableArrayExtra(MainActivity.DAILY_FORECAST);
        mDays = Arrays.copyOf(parcelables, parcelables.length, Day[].class);

However I think the issue relates to my onClickListener. I haven't been able to get ButterKnife to work so have tried to find alternatives to some of the videos...

Here is my onclicklistener:

dailyButton.setOnClickListener(new View.OnClickListener(){
            public void onClick(View v){
                startActivity(new Intent(MainActivity.this, DailyForecastsActivity.class));
                getIntent().putExtra(DAILY_FORECAST, mForecast .getDailyForecast());
            }
        });

Any ideas?? This has really stumped me!

Thanks,

Linton

1 Answer

Seth Kroger
Seth Kroger
56,414 Points
Seth Kroger
Seth Kroger
56,414 Points

When you want to pass data to the next Activity you need to create the Intent and add the data to it first before calling startActivity. Otherwise you are starting a new Activity without any extra data.