如何将数据从RecyclerView传递到activity

// 1. 创建接口
public interface OnItemClickListener {
    void onItemClick(String data);
}

// 2. 在适配器中设置接口
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private OnItemClickListener onItemClickListener;

    public void setOnItemClickListener(OnItemClickListener listener) {
        this.onItemClickListener = listener;
    }

    // ...

    // 3. ViewHolder中绑定点击事件，并调用接口方法传递数据
    public class ViewHolder extends RecyclerView.ViewHolder {
        private TextView textView;

        public ViewHolder(View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.text_view);

            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    String data = textView.getText().toString();
                    if (onItemClickListener != null) {
                        onItemClickListener.onItemClick(data);
                    }
                }
            });
        }
    }
}

// 4. 在Activity中实现接口方法，获取传递的数据
public class MainActivity extends AppCompatActivity implements OnItemClickListener {
    // ...

    @Override
    public void onItemClick(String data) {
        // 处理传递的数据
    }
}

// 1. 创建自定义广播
public class DataBroadcast extends BroadcastReceiver {
    public static final String ACTION_DATA = "com.example.data_broadcast.ACTION_DATA";

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(ACTION_DATA)) {
            String data = intent.getStringExtra("data");
            // 处理传递的数据
        }
    }
}

// 2. 在适配器中发送广播
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private Context context;

    public MyAdapter(Context context) {
        this.context = context;
    }

    // ...

    // 3. 在点击事件中发送广播
    public class ViewHolder extends RecyclerView.ViewHolder {
        private TextView textView;

        public ViewHolder(View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.text_view);

            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    String data = textView.getText().toString();

                    Intent intent = new Intent(DataBroadcast.ACTION_DATA);
                    intent.putExtra("data", data);
                    context.sendBroadcast(intent);
                }
            });
        }
    }
}

// 4. 在Activity中注册广播接收器，并处理传递的数据
public class MainActivity extends AppCompatActivity {
    private DataBroadcast dataBroadcast;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // ...

        // 注册广播接收器
        dataBroadcast = new DataBroadcast();
        IntentFilter filter = new IntentFilter(DataBroadcast.ACTION_DATA);
        registerReceiver(dataBroadcast, filter);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        // 取消注册广播接收器
        unregisterReceiver(dataBroadcast);
    }

    // 在广播接收器中处理传递的数据
    private class DataBroadcast extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            String data = intent.getStringExtra("data");
            // 处理传递的数据
        }
    }
}