Android：在 RecyclerView 中获取用户输入和显示

Posted 2023-05-07

【中文标题】Android：在 RecyclerView 中获取用户输入和显示

【英文标题】：Android : Getting User input and Display in RecyclerView

【发布时间】：2020-12-12 04:22:48

【问题描述】：

如何获取用户输入并显示到 Recycler 视图中

在我以前的活动中，我得到用户输入的项目名称和用户在 Gridview 中选择图像和 想要将这些图像和项目名称传递到列表视图中

从 Activity 1 传递用户输入

 done.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View v) 


                String itemname = listname.getText().toString();
                if (!TextUtils.isEmpty(listname.getText().toString())) 

                    startActivity(new Intent(getContext(), CheckHome.class).putExtra("data", itemname).putExtra("image", imageRes));
                    dismiss();
                 else 
                    Toast.makeText(getContext(), "List Name not Empty ", Toast.LENGTH_SHORT).show();
                

            

        );

想要在回收站视图中将用户输入和所选图像显示到 ListView 中

public class CheckHome extends AppCompatActivity 

    ArrayList listimages;
    ArrayList listname;



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

        // get the reference of RecyclerView
        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        // set a LinearLayoutManager with default vertical orientation
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getApplicationContext());
        recyclerView.setLayoutManager(linearLayoutManager);
        // call the constructor of CustomAdapter to send the reference and data to Adapter
        CustomAdapter customAdapter = new CustomAdapter(this, listname,listimages);
        recyclerView.setAdapter(customAdapter); // set the Adapter to RecyclerView
    

    private class CustomAdapter extends RecyclerView.Adapter 


        ArrayList listimages;
        ArrayList listname;
        Context context;

        public CustomAdapter(Context context,ArrayList listimages, ArrayList listname ) 
            this.listimages = listimages;
            this.listname = listname;
            this.context = context;
        

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

            // infalte the item Layout
            View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.rowlayout, parent, false);

            MyViewHolder vh = new MyViewHolder(v); // pass the view to View Holder
            return vh;

        

        @Override
        public void onBindViewHolder( RecyclerView.ViewHolder holder, int position) 

                   //what to Display Here 
        

        @Override
        public int getItemCount() 
            return 0;
        
    

    private class MyViewHolder extends RecyclerView.ViewHolder 
        // init the item view's
        TextView name;
        ImageView image;
        TextView listcount;

        public MyViewHolder(View itemView) 
            super(itemView);
            // get the reference of item view's
            name = (TextView) itemView.findViewById(R.id.list_name);
            image = (ImageView) itemView.findViewById(R.id.image_list);
            listcount=itemView.findViewById(R.id.list_count);


        
    

【参考方案1】：

在您的 Activity OnCreate() 方法中，您可以访问通过 Intent 传递的数据，如下所示：

Bundle bundle = getIntent().getExtras();
if (bundle != null) 
String itemName= bundle.getString("data");

这里我得到的是字符串，但你也可以传递字符串数组。您可以将此值传递给您的 RecyclerAdapter 类：

 CustomAdapter customAdapter = new CustomAdapter(this, listname,listimages);

但不要通过意图传递大量数据。

【讨论】：

想要在 Oncreate() 中传递 Intent 值那么我们需要在 onBindViewHolder 上传递什么

你必须先创建一个数据模型类。请参阅此处的示例：journaldev.com/10024/…

【参考方案2】：

getItemCount() 也不应该为 0。你必须传递一些大小给它。 喜欢，modelList.size()