自定义显示子项

在ViewHolder中定义recyclerView列表中每个显示子项的具体样式 布局文件

<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginBottom="@dimen/dp_10" android:id="@+id/clItemLayout" android:background="@drawable/new_broad_list_item_style"> <TextView android:id="@+id/tvDeviceName" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_marginStart="@dimen/dp_8" android:layout_marginLeft="@dimen/dp_8" android:layout_marginTop="@dimen/dp_8" android:layout_marginEnd="8dp" android:layout_marginRight="8dp" android:text="设备名称" android:textColor="@color/c_ffffff" android:textSize="@dimen/dp_18" /> ... </androidx.constraintlayout.widget.ConstraintLayout>

示例代码如下：

class ViewHolder extends RecyclerView.ViewHolder { ConstraintLayout clItemLayout; TextView tvDeviceState, tvDeviceName, tvDeviceMac, tvDeviceIP, tvDeviceArea, tvIssue, tvAmend, tvDelete, tvDeviceBroadState, tvDeviceTransfer; public ViewHolder(View itemView) { super(itemView); clItemLayout = itemView.findViewById(R.id.clItemLayout); tvDeviceName = itemView.findViewById(R.id.tvDeviceName); ... } }

重写方法

以下三个方法必须重写

public int getItemCount() // 返回显示子项的布局 public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) // 绑定view，注册点击事件 public void onBindViewHolder(@NonNull ViewHolder holder, int position)

示例代码如下：

public class DeviceListAdapter extends RecyclerView.Adapter<DeviceListAdapter.ViewHolder> { private List<DeviceEntity.ReturnDataBean> beanList; private Context context; public DeviceListAdapter() { beanList = new ArrayList<>(); } @NonNull @Override public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { context = parent.getContext(); return new ViewHolder(LayoutInflater.from(parent.getContext()).inflate( R.layout.fragment_device_item, parent, false)); } @Override public void onBindViewHolder(@NonNull ViewHolder holder, int position) { DeviceEntity.ReturnDataBean bean = beanList.get(position); holder.tvDeviceName.setText(bean.getName()); holder.tvDeviceMac.setText(bean.getMac()); holder.tvDeviceIP.setText(bean.getIp()); holder.tvDeviceArea.setText(bean.getLocation()); holder.tvDeviceState.setText(bean.getDeviceStatusPlay()); holder.clItemLayout.setOnClickListener(v -> { if (Utils.isFastClick()) return; new DeviceDetailsDialog(context, bean).setOnDismissListener(dialog -> { }); }); holder.tvDeviceTransfer.setOnClickListener(v -> { new DeviceTransferDialog(context); }); ... } @Override public int getItemCount() { return beanList.size(); } class ViewHolder extends RecyclerView.ViewHolder { ConstraintLayout clItemLayout; TextView tvDeviceState, tvDeviceName, tvDeviceMac, tvDeviceIP, tvDeviceArea, tvIssue, tvAmend, tvDelete, tvDeviceBroadState, tvDeviceTransfer; public ViewHolder(View itemView) { super(itemView); clItemLayout = itemView.findViewById(R.id.clItemLayout); tvDeviceName = itemView.findViewById(R.id.tvDeviceName); ... } } private int getColor(int colorId) { return context.getResources().getColor(colorId); } }

在界面中的调用

public class DeviceFragment extends BaseFragment { private RecyclerView rvDeviceAllList; private DeviceListAdapter allAdapter; @Override public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); initListView(); } } private void initListView() { rvDeviceAllList = View.findViewById(R.id.rvDeviceAllList); allAdapter = new DeviceListAdapter(); rvDeviceAllList.setAdapter(allAdapter); } // 每次adapter中的list数据改变时，调用以下方法 allAdapter.notifyDataSetChanged();