如何在Android中从RecyclerView适配器获取项目

Question

在旧代码中，当我使用ListView与自定义适配器时，我可以使用此代码获取项目。

Message msg = (Message) adapter.getItem(poistion);

现在我正在实现RecyclerView。如何从<代码>回收视图中获取项目。适配器？

Answer 1

我的听众做到了

public class MainActivity extends AppCompatActivity {

    Context context;
    RecyclerView recyclerView;
    RelativeLayout relativeLayout;
    RecyclerView.Adapter recyclerviewAdapter;
    RecyclerView.LayoutManager recyclerViewLayoutManager;
    String[] numbers = { "ANDROID",
            "PHP",
            "BLOGGER",
            "WORDPRESS",
            "JOOMLA",
            "ASP.NET",
            "JAVA",
            "C++",
            "MATHS",
            "HINDI",
            "ENGLISH"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        context = getApplicationContext();
        relativeLayout = (RelativeLayout)findViewById(R.id.relativelayout1);
        recyclerView = (RecyclerView)findViewById(R.id.recyclerview1);
        recyclerViewLayoutManager = new LinearLayoutManager(context);
        recyclerView.setLayoutManager(recyclerViewLayoutManager);

        recyclerviewAdapter = new RecyclerViewAdapter(context,numbers);
        recyclerView.setAdapter(recyclerviewAdapter);



    }


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

        String[] numvalues;
        Context context;
        View view1;
        ViewHolder viewHolder1;
        TextView textView;



        public RecyclerViewAdapter(Context context1,String[] numvalues1){
            numvalues = numvalues1;
            context = context1;


        }

        public  class ViewHolder extends RecyclerView.ViewHolder{

            public TextView textView;

            public ViewHolder(View v){
                super(v);
                textView = (TextView)v.findViewById(R.id.number_textview);
            }
        }
        @Override
        public RecyclerViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

            view1 = LayoutInflater.from(context).inflate(R.layout.recyclerview_items,parent,false);
       //     view1.setOnClickListener(new MyOnClickListener());
            view1.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    int itemPosition = recyclerView.indexOfChild(v);
                    //    Toast.makeText(MainActivity.this,"Selected item position is---"+ itemPosition,Toast.LENGTH_SHORT).show();
                    textView = (TextView)v.findViewById(R.id.number_textview);
                    Toast.makeText(MainActivity.this,"Selected val of clicked position is---"+ textView.getText().toString(),Toast.LENGTH_SHORT).show();
                }
            });

            viewHolder1 = new ViewHolder(view1);



            return viewHolder1;
        }

        @Override
        public void onBindViewHolder(ViewHolder holder, int position) {
            holder.textView.setText(numvalues[position]);
        }

        @Override
        public int getItemCount() {
            return numvalues.length;
        }
    }
}

Answer 2

我认为getItem（）的正确方法是通过RecyclerView LayoutManager。

View v = recyclerView.getLayoutManager().findViewByPosition(position);

Answer 3

你必须自己实现它。

在自定义适配器中添加一个新方法，就完成了。

public Message getItem(int position) {
  return messageList.get(position);
}