如何调试此运行时错误？

Question

这是一个包含函数loadMenu的java文件，当相应的intent打开时，应用程序意外关闭。

private void loadMenu() {
    FirebaseRecyclerAdapter<Category,MenuViewHolder> adapter = new                                     FirebaseRecyclerAdapter<Category, MenuViewHolder>    (Category.class,R.layout.item_menu,MenuViewHolder.class,category) {
            @Override
            protected void populateViewHolder(MenuViewHolder viewHolder, Category model, int position) {

                viewHolder.txtMenuname.setText(model.getName());
                Picasso.with(getBaseContext()).load(model.getImage())
                        .into(viewHolder.imageView);
                final Category clickItem = model;
                viewHolder.setItemClickListener(new ItemClickListener() {
                    @Override
                    public void OnClick(View view, int position, boolean isLongClick) {
                        Toast.makeText(navi.this,""+clickItem.getName(),Toast.LENGTH_SHORT).show();
                }

                    @Override
                    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                    }
                });

            }
        };
          recycle_menu.setAdapter(adapter);
    }

这是我的MenuviewHolder类：我刚刚为firebase中的图像创建了一个数据库并将其链接到我的应用程序，但它不显示图像只是背景。

public class MenuViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

public TextView txtMenuname;
public ImageView imageView;
private ItemClickListener itemClickListener;
public MenuViewHolder(View itemView) {
    super(itemView);

    txtMenuname = (TextView)itemView.findViewById(R.id.menu_name);
    itemView = (ImageView)itemView.findViewById(R.id.menu_image);
    itemView.setOnClickListener(this);
}

public void setItemClickListener(ItemClickListener itemClickListener){
    this.itemClickListener = itemClickListener;
}

@Override
public void onClick(View view) {
    itemClickListener.OnClick(view,getAdapterPosition(),false);

}

}

适配器代码使用firebaseUI将图像和名称链接到应用程序

public class Category {

    private String Name;
    private String Image;

       public Category(){
        }
        public Category(String name, String image){
            Name = name;
            Image = image;
        }

    public String getName() {
       return Name;
    }

    public void setName(String name) {
        Name = name;
    }


    public String getImage() {
        return Image;
    }

    public void setImage(String image) {
        Image = image;
    }
}

Answer 1

private void loadMenu() {
FirebaseRecyclerAdapter<Category,MenuViewHolder>
                          adapter = new                                     
FirebaseRecyclerAdapter <Category, MenuViewHolder>    

 (Category.class,R.layout.item_menu, 
 MenuViewHolder.class,category) {
        @Override
        protected void      


 populateViewHolder(MenuViewHolder   viewHolder,     

 Category model, int position) {


  viewHolder.txtMenuname.setText(model.getName());
  If (model.getimage() != null){          

 Picasso.with(getapplicationcontext()). 
 load (model.getImage())
                    .into(viewHolder.imageView);}
  else {//Toast here}
            final Category clickItem = model;
            viewHolder.setItemClickListener(new      

ItemClickListener() {
                @Override
                public void OnClick(View view, int position,     

boolean isLongClick) {


Toast.makeText(navi.this,""+clickItem.getName(), 
Toast.LEN
 GTH_SHORT).show();
            }

                @Override
                public void onItemClick(AdapterView<?> parent,       

 View view, int position, long id) {

                }
            });

        }
     };
      recycle_menu.setAdapter(adapter);
   }