Android RecyclerView选择器动态数据
创始人
2024-08-15 07:00:37
0

要实现Android RecyclerView选择器动态数据,可以按照以下步骤进行:

  1. 首先,在布局文件中添加一个RecyclerView,例如:

  1. 创建一个数据模型类,表示RecyclerView中的每个项。例如,创建一个Item类:
public class Item {
    private String name;
    private boolean isSelected;

    public Item(String name) {
        this.name = name;
        this.isSelected = false;
    }

    public String getName() {
        return name;
    }

    public boolean isSelected() {
        return isSelected;
    }

    public void setSelected(boolean selected) {
        isSelected = selected;
    }
}
  1. 创建一个适配器类,继承自RecyclerView.Adapter,并实现相关方法。例如,创建一个ItemAdapter类:
public class ItemAdapter extends RecyclerView.Adapter {
    private List itemList;

    public ItemAdapter(List itemList) {
        this.itemList = itemList;
    }

    @NonNull
    @Override
    public ItemViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_layout, parent, false);
        return new ItemViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ItemViewHolder holder, int position) {
        Item item = itemList.get(position);
        holder.textView.setText(item.getName());
        holder.itemView.setSelected(item.isSelected());
    }

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

    public class ItemViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        private TextView textView;

        public ItemViewHolder(@NonNull View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.textView);
            itemView.setOnClickListener(this);
        }

        @Override
        public void onClick(View v) {
            int position = getAdapterPosition();
            if (position != RecyclerView.NO_POSITION) {
                Item item = itemList.get(position);
                item.setSelected(!item.isSelected());
                notifyItemChanged(position);
            }
        }
    }
}
  1. 创建一个布局文件,用于显示RecyclerView中的每个项。例如,创建一个item_layout.xml文件:


    


  1. 在Activity或Fragment中,初始化RecyclerView和适配器,并设置RecyclerView的布局管理器和适配器。例如,在MainActivity中:
public class MainActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private ItemAdapter itemAdapter;

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

        recyclerView = findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        List itemList = new ArrayList<>();
        itemList.add(new Item("Item 1"));
        itemList.add(new Item("Item 2"));
        itemList.add(new Item("Item 3"));

        itemAdapter = new ItemAdapter(itemList);
        recyclerView.setAdapter(itemAdapter);
    }
}

这样,当用户点击RecyclerView中的项时,项的isSelected属性会切换,并刷新项的显示状态。

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