Android Requestqueue Not Initialized

I am new to android and currently I want to develop an application that need to request network using volley. However, it returns error below: Caused by: java.lang.IllegalStateExce

Solution 1:

Register your application class name in manifest to avoid Request not initialized issue

<application
android:name=".StaggeredDemoApplication"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">