How do I fix the FATAL EXCEPTION error on mDrawerLayout.setDrawerShadow(...)

Question

0.00/5 (No votes)

See more:

, +

I'm trying to add signin/signup functionality in my NavigationDrawer app but I'm running into this problem when I compile the project.

Java

"FATAL EXCEPTION Caused by: java.lang.NullPointerException at MainActivity.onCreate(MainActivity.java:111)"

Here's that line

Java

mDrawerLayout.setDrawerShadow(drawable.drawer_shadow,GravityCompat.START);

Here's a snippet of the code

Java

...
dataList = new ArrayList<>();
mTitle = mDrawerTitle = getTitle();
mDrawerList = (ListView) findViewById(id.left_drawer);
mDrawerLayout = (DrawerLayout) findViewById(id.drawer_layout);
mDrawerLayout.setDrawerShadow(drawable.drawer_shadow,GravityCompat.START);
...

I'm not sure how a NullPointerException is being thrown on that line since the drawer_shadow image exists in my drawable folder.

Posted 31-May-15 17:44pm

pyler

Updated 31-May-15 17:45pm

v2

Add a Solution

Comments

Richard MacCutchan 1-Jun-15 7:04am

Step through the code with the debugger to identify which reference is null.

pyler 2-Jun-15 0:22am

for some reason the debugger hangs whenever I run this project so I can't really findout what's going wrong with my code. Any other suggestions?

Richard MacCutchan 2-Jun-15 3:51am

Well you know where the exception happens so you just need to track back through the code checking that each method call returns valid results. Add some debug code to verify the value of each reference as it runs through the code. You also need to investigate what is causing the debugger to hang.

pyler 2-Jun-15 23:14pm

Solved it, thanks!

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)