CODEWITHSUNDEEP
android
Sourabh Bhardwaj
Sourabh Bhardwaj

Reputation: 59

Attempt to invoke virtual method 'void android.widget.Button.setVisibility(int)' on a null object reference

I have set the visibilty for button as "gone" but now when i want to set button visible , Getting following error while trying to set visibility for button

    @Bind(R.id.btn1)
    Button btn1;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        View view = inflater.inflate(R.layout.hifragment_main, container, false);

      if(1==1) 
        {
            btn1.setVisibility(View.VISIBLE);
        }
        return view;
    }

Upvotes: 1

Views: 25355

Answers (3)

Noa Nash
Noa Nash

Reputation: 1

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        View view = inflater.inflate(R.layout.hifragment_main, container, false);
        btn =view.findViewById(R.id.btn) // this line is important

        btn.setVisibility(View.VISIBLE);

        return view;
    }
//it's work for me .
`

Upvotes: 0

Tejas
Tejas

Reputation: 928

you didn't initialize you button, please initialize it as below,

View view = inflater.inflate(R.layout.hifragment_main, container, false);
btn1 = (Button) view.findViewById(R.id.btn1);

Upvotes: 6

Petrov Dmitrii
Petrov Dmitrii

Reputation: 228

You need to initialize your button object.

btn1 = (Button) findViewById(R.id.your_btn_id);

Then you can check if (btn1 != null)

Upvotes: 0

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