无法解析类中的符号 findViewById 扩展 RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder>答案

【问题标题】：cannot resolve symbol findViewById in class with extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder>无法解析类中的符号 findViewById 扩展 RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder>
【发布时间】：2018-09-25 22:47:16
【问题描述】：

这是我的课

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {

我尝试在方法@Override public void onBindViewHolder(ViewHolder Viewholder, int position) { 中声明foto = (ImageView) findViewById(R.id.Foto);

我尝试使用protected void onCreate(Bundle savedInstanceState) {，但它仍然是错误

适配器类

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {

    Context context;
    private static final String TAG = RecyclerViewAdapter.class.getSimpleName();

    List<GetDataAdapter> getDataAdapter;

    ImageLoader imageLoader1;
    private ImageView foto;
    String getFoto;
    String FIXURL = "http://192.168.0.103/AndroidFileUpload/";
    String url = FIXURL + "uploads/";


    public RecyclerViewAdapter(List<GetDataAdapter> getDataAdapter, Context context) {

        super();
        this.getDataAdapter = getDataAdapter;
        this.context = context;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.recyclerview_items, parent, false);

        ViewHolder viewHolder = new ViewHolder(v);

        return viewHolder;
    }

    @Override
    public void onBindViewHolder(ViewHolder Viewholder, int position) {

        final GetDataAdapter getDataAdapter1 = getDataAdapter.get(position);

        imageLoader1 = ServerImageParseAdapter.getInstance(context).getImageLoader();

//        imageLoader1.get(getDataAdapter1.getFoto(),
//                ImageLoader.getImageListener(
//                        Viewholder.networkImageView,//Server Image
//                        R.mipmap.ic_launcher,//Before loading server image the default showing image.
//                        android.R.drawable.ic_dialog_alert //Error image if requested image dose not found on server.
//                )
//        );
//        getFoto = getDataAdapter1.getIdJalan();;
//        String FullURL = url+getFoto;
        foto = (ImageView) findViewById(R.id.Foto);
//        Picasso.with(getApplicationContext()).load(url + getDataAdapter1.getFoto()).into(foto);

        Viewholder.networkImageView.setImageUrl(getDataAdapter1.getFoto(), imageLoader1);

        Viewholder.ImageTitleNameView.setText(getDataAdapter1.getIdJalan());

        Viewholder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.d(TAG, "coba nih5 : "+getDataAdapter1.getIdJalan());
//
//                Intent intent = new Intent(v.getContext(), SeconActivity.class);
//                intent.putExtra("key",getDataAdapter1.getImageTitleName());// getDataAdapter1 in your case
//                context.startActivity(intent);
            }
        });

    }

    @Override
    public int getItemCount() {

        return getDataAdapter.size();
    }

    class ViewHolder extends RecyclerView.ViewHolder{

        public TextView ImageTitleNameView;
        public NetworkImageView networkImageView;

        public ViewHolder(View itemView) {

            super(itemView);

            ImageTitleNameView = (TextView) itemView.findViewById(R.id.textView_item);

            networkImageView = (NetworkImageView) itemView.findViewById(R.id.VollyNetworkImageView1);
        }


    }
}

这是布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:id="@+id/cardview1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    card_view:cardElevation="3dp"
    card_view:contentPadding="3dp"
    card_view:cardCornerRadius="3dp"
    card_view:cardMaxElevation="3dp"
    >


    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">

        <de.hdodenhof.circleimageview.CircleImageView
            android:id="@+id/Foto"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:src="@mipmap/ic_launcher"/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:text="Image Name"
            android:id="@+id/textView_item"
            android:layout_centerVertical="true"
            android:layout_toRightOf="@+id/VollyNetworkImageView1"
            android:layout_toEndOf="@+id/VollyNetworkImageView1"
            android:layout_marginLeft="20dp"/>

    </RelativeLayout>

    </android.support.v7.widget.CardView>

【问题讨论】：

分享你的适配器类和与适配器相关的布局
@MithunSarkerShuvro 我已经分享了
您的 VollyNetworkImageView1 在布局文件中的什么位置？
@MithunSarkerShuvro 嗯抱歉没有使用.. 这是评论
这个错误意味着你使用了错误的对象来调用findViewById()。您必须使用Activity 或View 来调用此方法。

标签： android

【解决方案1】：

这个错误意味着你使用了错误的对象来调用findViewById()。您必须使用Activity 或View 来调用此方法。您很可能需要从传递给onBindViewHolder() 方法的ViewHolder 获取视图。像这样的

View v = viewholder.itemView;
foto = (ImageView) v.findViewById(R.id.Foto);

附言声明 ViewHolder Viewholder 令人难以置信的混乱。通常变量名以小写字母开头。更好的是，使用一个明显不同的词，例如ViewHolder holder。这样就可以清楚地知道类型和名称是什么，而无需仔细查看确切的字母和大小写。

【讨论】：