使用edit text和recyclerview实现一个搜索功能

好的，下面是一个简单的使用EditText和RecyclerView实现搜索功能的示例：

1. 首先，在你的布局文件中添加一个EditText和一个RecyclerView，例如：

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <EditText
        android:id="@+id/search_box"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Search"/>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

2. 在你的Activity或Fragment中，初始化EditText和RecyclerView，并为EditText添加文本改变监听器：

public class MyActivity extends AppCompatActivity {

    private EditText searchBox;
    private RecyclerView recyclerView;
    private MyAdapter adapter;
    private List<String> dataList;

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

        searchBox = findViewById(R.id.search_box);
        recyclerView = findViewById(R.id.recycler_view);

        // 初始化数据
        dataList = new ArrayList<>();
        for (int i = 0; i < 50; i++) {
            dataList.add("Item " + i);
        }

        // 初始化适配器和RecyclerView
        adapter = new MyAdapter(dataList);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setAdapter(adapter);

        // 添加文本改变监听器
        searchBox.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                adapter.getFilter().filter(s);
            }

            @Override
            public void afterTextChanged(Editable s) {}
        });
    }
}

3. 创建一个自定义Adapter，并实现Filterable接口，用于过滤数据：

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> implements Filterable {

    private List<String> dataList;
    private List<String> filteredDataList;

    public MyAdapter(List<String> dataList) {
        this.dataList = dataList;
        this.filteredDataList = new ArrayList<>(dataList);
    }

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

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        holder.textView.setText(filteredDataList.get(position));
    }

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

    @Override
    public Filter getFilter() {
        return new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                String searchText = constraint.toString().toLowerCase(Locale.getDefault());
                List<String> tempList = new ArrayList<>();
                if (searchText.isEmpty()) {
                    tempList.addAll(dataList);
                } else {
                    for (String item : dataList) {
                        if (item.toLowerCase(Locale.getDefault()).contains(searchText)) {
                            tempList.add(item);
                        }
                    }
                }
                FilterResults filterResults = new FilterResults();
                filterResults.values = tempList;
                return filterResults;
            }

            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) {
                filteredDataList.clear();
                filteredDataList.addAll((List<String>) results.values);
                notifyDataSetChanged();
            }
        };
    }

    static class MyViewHolder extends RecyclerView.ViewHolder {
        TextView textView;

        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.text_view);
        }
    }
}

以上就是使用EditText和RecyclerView实现搜索功能的一个简单示例，你可以根据自己的需求进行修改和扩展。