Android Butterknife null object reference error

Question

I have an error in Android ButterKnife, using androidx instead of android

java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.recyclerview.widget.RecyclerView.setLayoutManager(androidx.recyclerview.widget.RecyclerView$LayoutManager)' on a null object reference build.gradle(project)

classpath 'com.android.tools.build:gradle:3.2.1'

build.gradle(app)

implementation 'com.jakewharton:butterknife:8.8.1'
annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'

and error in fragment

@BindView(R.id.recyclerViewProduct)
RecyclerView recyclerViewProduct;
private Unbinder unbinder;

inflating view

View view = inflater.inflate(R.layout.fragment_product, container, false);
 unbinder = ButterKnife.bind(this, view);

I got an error here

recyclerViewProduct.setLayoutManager(mLayoutManager);

and i unbind

 @Override
public void onDetach() {
    unbinder.unbind();
    super.onDetach();
}

score 2 · Answer 1 · answered Nov 24 '18 at 06:23

2

Double check if R.id.recyclerViewProduct is defined int the layout file fragment_product.xml.

answered Nov 24 '18 at 06:23

AJAY PRAKASH

1,110
7
8

Yep,i have added all view ids inside fragment with ButterKnifeZelezny – Ashik Azeez Nov 25 '18 at 18:12

score 0 · Answer 2 · answered Dec 04 '18 at 08:20

0

replace butterknife libs by this

implementation 'com.jakewharton:butterknife:9.0.0-rc1'
annotationProcessor 'com.jakewharton:butterknife-compiler:9.0.0-rc1'
kapt 'com.jakewharton:butterknife-compiler:9.0.0-rc1'

answered Dec 04 '18 at 08:20

mmfarzaneh

381
1
11

Android Butterknife null object reference error

2 Answers2