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

Set the id attribute in the Toolbar xml like this:

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/app_bar"
    app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:minHeight="?attr/actionBarSize"
    android:background="?attr/colorPrimary"
    app:popupTheme="@style/ThemeOverlay.AppCompat.Dark" >
</android.support.v7.widget.Toolbar>

Then remove it from the include block so it looks like this:

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

And to simplify further you could just remove the include block completely and simply insert the Toolbar directly into the xml where the include was.

Answer 2

In my case , i was trying to access the Toolbar inside onAttach() method of a fragment instead of onActivityCreated() , resulting in NullPointerException.

Answer 3

i was struck with the same issue and none of the answer's worked for me, i had actually forgotten to include the toolbar layout in the activity.

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

Answer 4

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

android.support.v7.widget.Toolbar.getTitle() on a null object reference happens due to title clashes between ids of and that of the id in toolbar.xml definition . To overcome this issue remove the id in as below and latest Lollipop material design shall work fine with toolbar

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

Answer 5

Another possible cause is using a wrong layout in setContentView(R.layout.yourLayout)

Answer 6

When I had this problem, I configured the layout of the activity and of the toolbar with the same id's