Question

我正在尝试创建自定义导航抽屉。我使用的是mikepenz抽屉，但是有很多错误。我无法使用Android提供的导航抽屉，因为我要在运行时添加菜单项。菜单项作为对象添加，并且成功登录后从XML文件创建这些对象。还有其他方法可以做到这一点吗？

Mikepenz物料抽屉在API 28中崩溃

Answer 1

检查以下示例。

创建activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/container_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v4.widget.DrawerLayout
        android:id="@+id/drawer"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <RelativeLayout
            android:id="@+id/layout_drawer"
            android:layout_width="250dp"
            android:layout_height="match_parent"
            android:layout_gravity="start"
            android:background="#000">

            <android.support.v7.widget.RecyclerView
                android:id="@+id/rv_drawer"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:overScrollMode="never" />
        </RelativeLayout>
    </android.support.v4.widget.DrawerLayout>
</RelativeLayout>`

之后创建MainActivity.java

`public class MainActivity extends AppCompatActivity {

    private RecyclerView rvDrawer;
    private DrawerAdapter adDrawer;

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

        ArrayList<DrawerModel> alDrawerData = new ArrayList<>();
        alDrawerData.add("add runtime data her")// added runtime data in this arraylist.
        rvDrawer = findViewById(R.id.rv_drawer);
        rvDrawer.setLayoutManager(new LinearLayoutManager(this));

        adDrawer = new DrawerAdapter();
        rvDrawer.setAdapter(adDrawer);

        adDrawer.addDrawerData(alDrawerData);

    }

}

像这样DrawerModel.java创建模型类。

    public class DrawerItem {
        private String label;
        private int imageId;

        public DrawerItem(String label, int imageId) {
            this.label = label;
            this.imageId = imageId;
        }

        public String getLabel() {
            return label;
        }

        public void setLabel(String label) {
            this.label = label;
        }

        public int getImageId() {
            return imageId;
        }

        public void setImageId(int imageId) {
            this.imageId = imageId;
        }
    }

现在，您的适配器类为DrawerAdapter.java

public class DrawerAdapter extends RecyclerView.Adapter<DrawerAdapter.VHDrawer> {

    private Context mContext;
    private ArrayList<DrawerItem> alDrawerData;
    private DrawerAdapter.OnItemClickListener onItemClickListener;
    private String userName;

    public DrawerAdapter(Context context) {
        this.mContext = context;
        alDrawerData = new ArrayList<>();
        this.onItemClickListener = onItemClickListener;
    }


    public String getItem(int position) {
        return alDrawerData.get(position).getLabel();
    }

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

    @Override
    public void onBindViewHolder(DrawerAdapter.VHDrawer holder, int position) {
        DrawerItem drawerItem = alDrawerData.get(position);
        holder.imgDrawer.setImageResource(drawerItem.getImageId());
        holder.tvDrawer.setText(drawerItem.getLabel());
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

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


    public void addDrawerData(ArrayList<DrawerItem> alDrawerData) {
        this.alDrawerData = alDrawerData;
        this.notifyDataSetChanged();
    }

    public interface OnItemClickListener {
        void onItemClick(int position);
    }

    class VHDrawer extends RecyclerView.ViewHolder {
        @BindView(R.id.imgDrawer)
        ImageView imgDrawer;
        @BindView(R.id.txtDrawer)
        TextView tvDrawer;

        public VHDrawer(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
            itemView.setOnClickListener(v -> {
                if (onItemClickListener != null) {
                    onItemClickListener.onItemClick(getAdapterPosition());
                }
            });
        }
    }

}

现在创建您的抽屉项目布局文件lay_drawer_item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="5dp"

        android:orientation="horizontal">

        <ImageView
            android:id="@+id/imgDrawer"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="5dp"
            android:contentDescription="@string/app_name"
            android:src="@drawable/dashboard" />

        <TextView
            android:id="@+id/txtDrawer"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_margin="5dp"
            android:textColor="@android:color/white"
            android:textSize="15sp" />

    </LinearLayout>

</RelativeLayout>

如果有任何问题，请告诉我。

Answer 2

您可以在运行时将项目添加到导航抽屉中。

NavigationView navView = (NavigationView) findViewById(R.id.nav_view);

Menu menu = navView.getMenu();
Menu submenu = menu.addSubMenu("New Super SubMenu");

submenu.add("Super Item1");
submenu.add("Super Item2");
submenu.add("Super Item3");

navView.invalidate();

使用运行时添加的项创建自定义导航抽屉的最佳方法是哪种？

2 个答案: