NullPointerException with android.support.v7.widget.Toolbar

Question

I am currently trying to implement a navigation drawer in my app. I am having an issue with the Toolbar being null. I have done many searches online and tried many different

Answer 1

I solved the issue with the toolbar. I realized after hours of searching the web and trying different things, I realized that my code wasn't wrong, it was using layouts from the layout-21 not the layout folder since the emulation for Android 5.0. All modification I had made were in the layout folder. I made the changes to the xml files in the layout-21 folder and the problem was solved. Sorry for the wasted time and post.

Answer 2

I read another time your code...and I saw that you haven't defined the ID of your toolbar in your MainActivity XML...see your include in it :

<include layout="@layout/app_bar" />

<!-- But where's ID attribute here ? -->

<!-- add android:id="@+id/app_bar" -->

<!-- to finally have below : -->

<include layout="@layout/app_bar" android:id="@+id/app_bar" />

After that...you won't get this error 'cause your toolbar is finally found and isn't set to 'null'.

Answer 3

Answer is a little late but I just ran into this problem.

I had a similar issue and spent 7 hrs messing with it. It worked on 3 of 4 activities just fine but one would crash.

The only thing that worked for me, and I am not sure why, was to put the:

    mToolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(mToolbar);
    getSupportActionBar().setDisplayShowHomeEnabled(true); 

as the last code in my onCreate. It works perfectly now.

Answer 4

I had an issue with Toolbar that wasn't of support.v7 I mean that you must add android.support.v7.widget. before the cast you realize when finding Toolbar with ID...

Answer 5

In my own case, i had used

@Bind(R.id.toolbar)
protected Toolbar toolbar;

at the top of my code but forgot to do

ButterKnife.bind(this);

inside onCreate() method

I hope that helps someone

Remember to add

 compile 'com.jakewharton:butterknife:7.0.1'

to your build.gradle dependencies and import

import butterknife.Bind;
import butterknife.ButterKnife;

in your java code and rebuild your app.

Answer 6

check both line call is ok or not

    setContentView(R.layout.layout_file)
    toolbar = (Toolbar) findViewById(R.id.toolbar_top)