为什么我的适配器一直认为我有一个空引用？

Question

我正在尝试使用适配器将RecyclerView中的项目填满；但是，它一直以为我有一个空引用。

运行错误

   java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference

这是我用来填充适配器的片段的代码

MembersFragmentGaeilge

public class MembersFragmentGaeilge extends Fragment {

View v;
RecyclerView rvCarlowKilkenny;

    public MembersFragmentGaeilge() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        v = inflater.inflate(R.layout.fragment_members_gaeilge, container, false);

        rvCarlowKilkenny = v.findViewById(R.id.rv_Carlow_Kilkenny_Gaeilge);


        GridLayoutManager gridLayoutManager = new GridLayoutManager(getContext(), 1);
        rvCarlowKilkenny.setLayoutManager(gridLayoutManager);



      List<MemberData> mCarlowKilkenny;
      MemberData mMemberList;

      mCarlowKilkenny = new ArrayList<>();

      mMemberList = new MemberData("Micheal","Independent","Kerry", "SandymCo. Kerry", "michael.healy-raoireachtas.ie",
               "dfdfd","defewfwe",R.drawable.constituency_laois_offaly);
        mCarlowKilkenny.add(mMemberList);



        MembersAdapter carlowKilkennyAdapter = new MembersAdapter(getContext(),mCarlowKilkenny);
        rvCarlowKilkenny.setAdapter(carlowKilkennyAdapter);


        return v;
    }

}

这是我使用的适配器的代码

该项layout_members只是我希望在其中显示代码的地方，因此导致其在MemberFragmentGaeilge的整个页面上都处于网格布局中

MembersAdapter.java

public class MembersAdapter extends  RecyclerView.Adapter<MemberHolder> {

    private Context mContext;
    private List<MemberData> mMemberList;

    public MembersAdapter(Context mContext, List<MemberData> mMemberList){
        this.mContext = mContext;
        this.mMemberList = mMemberList;

    }
    @Override
    public MemberHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {

        View mView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.layout_members,viewGroup,false);

        return new MemberHolder(mView);
    }

 @Override
    public void onBindViewHolder(@NonNull MemberHolder memberHolder, int i) {

        memberHolder.mName.setText(mMemberList.get(i).getMemberName());
        memberHolder.mParty.setText(mMemberList.get(i).getMemberParty());
        memberHolder.mConstituency.setText(mMemberList.get(i).getMemberConstituency());
        memberHolder.mAddress.setText(mMemberList.get(i).getMemberAddress());
        memberHolder.mEmail.setText(mMemberList.get(i).getMemberEmail());
        memberHolder.mPhone.setText(mMemberList.get(i).getMemberPhone());
        memberHolder.mContributions.setText(mMemberList.get(i).getMemberContributions());
        memberHolder.imgMember.setImageResource(mMemberList.get(i).getMemberImage());


     memberHolder.mCardView.setOnClickListener(new View.OnClickListener() {


            //Passing the values over to the next class

            @Override
            public void onClick(View v) {
            /* Intent intent = new Intent(mContext,MembersFragmentGaeilge.class);
                intent.putExtra("memberName",mMemberList.get(memberHolder.getAdapterPosition()).getMemberName());
                intent.putExtra("memberParty",mMemberList.get(memberHolder.getAdapterPosition()).getMemberParty());
                intent.putExtra("memberConstituency",mMemberList.get(memberHolder.getAdapterPosition()).getMemberConstituency());
                intent.putExtra("memberAddress",mMemberList.get(memberHolder.getAdapterPosition()).getMemberAddress());
                intent.putExtra("memberEmail",mMemberList.get(memberHolder.getAdapterPosition()).getMemberEmail());
                intent.putExtra("memberPhone",mMemberList.get(memberHolder.getAdapterPosition()).getMemberPhone());
                intent.putExtra("memberContributions",mMemberList.get(memberHolder.getAdapterPosition()).getMemberContributions());

                mContext.startActivity(intent);*/
            }
        });

    }

    @Override
    public int getItemCount() {
        return mMemberList.size();
    }
}

class MemberHolder extends RecyclerView.ViewHolder {

    ImageView imgMember;
    TextView mName, mParty, mConstituency, mAddress, mEmail, mPhone, mContributions;
    CardView mCardView;

    public MemberHolder (View itemView){
        super(itemView);



        mName = itemView.findViewById(R.id.tvMemberName);
        mParty = itemView.findViewById(R.id.tvMemberParty);
        mConstituency = itemView.findViewById(R.id.tvMemberConstituency);
        mAddress = itemView.findViewById(R.id.tvMemberPhone);
        mEmail = itemView.findViewById(R.id.tvMemberEmail);
        mPhone = itemView.findViewById(R.id.tvMemberPhone);
        mContributions = itemView.findViewById(R.id.tvMemberContributions);
        imgMember = itemView.findViewById(R.id.imgMemberOireachtas);


       mCardView = itemView.findViewById(R.id.cvMemberOireachtas);
    }
}

Answer 1

检查您的mAdress id and mPhone id these two have same id thats the reason it show the error