在Android片段中设置标题工具栏，使空指​​针

Question

i want to set toolbar title in android fragment. but my code giving null pointer exception in below code:

((AppCompatActivity)getActivity()).getSupportActionBar().setTitle("PROFIL");

this is my full code

package id.prasetyo.appsgaul.Layout;

import android.os.Bundle;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import id.prasetyo.appsgaul.R;

public class Profil2Activity extends android.support.v4.app.Fragment implements SwipeRefreshLayout.OnRefreshListener  {

    private Toolbar toolbar;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.activity_profil2, container, false);

        toolbar = (Toolbar) rootView.findViewById(R.id.toolbar);

       ((AppCompatActivity)getActivity()).setSupportActionBar(toolbar

     ((AppCompatActivity)getActivity()).getSupportActionBar().setTitle( "PROFIL");


        return rootView;
    }


    @Override
    public void onRefresh() {
    }
}

any suggestion would be appreciated. thank you

Answer 1

Move the below code from onCreateView() method to onActivityCreated() method.

    toolbar = (Toolbar) rootView.findViewById(R.id.toolbar);
    ((AppCompatActivity)getActivity()).setSupportActionBar(toolbar);
    ((AppCompatActivity)getActivity()).getSupportActionBar().setTitle("PROFIL");

Only after the onActivityCreated() you can be sure that there is an Activity returned from getActivity() .

And use getView() instead of rootView inside onActivityCreated() .