java - 餐厅计划教程

我正在继续我的老师给我的Android教程的工作。该程序的想法是输入餐厅名称，地址和餐厅类型，并创建一个显示该界面。

我相信我完全复制了代码。但是，我得到一个错误：

"The method getType() is undefined for the type Restaurant".

我不知道这意味着什么以及如何解决它。

Eclipse给我的建议是“在类型餐厅中创建方法getType（）”，但是当我这样做时，在运行程序，输入餐厅的详细信息并保存它们时，我会得到一个空指针异常。

所以我的问题是：


错误是什么意思？
我如何解决它？


以下是我的主要课程Lunchlist.java：

@SuppressLint({ "ParserError", "ParserError" })
public class LunchList extends Activity {
    List<Restaurant> model=new ArrayList<Restaurant>();
    ArrayAdapter<Restaurant> adapter=null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_lunch_list);

        Button save=(Button)findViewById(R.id.btnSave);

        save.setOnClickListener(onSave);

        ListView list=(ListView)findViewById(R.id.restaurants);

        adapter=new RestaurantAdapter();
        list.setAdapter(adapter);
    }

   private View.OnClickListener onSave=new View.OnClickListener() {
        public void onClick(View v){
            Restaurant r=new Restaurant();
            EditText name=(EditText) findViewById(R.id.name);
            EditText address=(EditText) findViewById(R.id.address);


            r.setName(name.getText().toString());
            r.setAddress(address.getText().toString());

            RadioGroup types=(RadioGroup)findViewById(R.id.types);

            switch (types.getCheckedRadioButtonId()){
            case R.id.sit_down:
                r.setType("sit_down");
                break;
            case R.id.take_out:
                r.setType("take_out");
                break;
            case R.id.delivery:
                r.setType("delivery");
                break;

            }
            adapter.add(r);
        }
        };

        class RestaurantAdapter extends ArrayAdapter<Restaurant> {
            RestaurantAdapter(){
                super(LunchList.this,R.layout.row,model);
            }
        public View getView(int position, View convertView, ViewGroup parent){
            View row=convertView;
            RestaurantHolder holder=null;

            if (row==null){
                LayoutInflater inflater=getLayoutInflater();

                row=inflater.inflate(R.layout.row, parent, false);
                holder=new RestaurantHolder(row);
                row.setTag(holder);
            }
            else{
                holder=(RestaurantHolder)row.getTag();
            }
            holder.populateFrom(model.get(position));
            return(row);
        }
        }

        static class RestaurantHolder {
            private TextView name=null;
            private TextView address=null;
            private ImageView icon=null;
            private View row=null;

            RestaurantHolder(View row){
                this.row=row;

                name=(TextView)row.findViewById(R.id.title);
                address=(TextView)row.findViewById(R.id.address);
                icon=(ImageView)row.findViewById(R.id.icon);
            }

            void populateFrom(Restaurant r){
                name.setText(r.getName());
                address.setText(r.getAddress());

            if (r.getType().equals("sit_down")){
                icon.setImageResource(R.drawable.sitdown);
            }
            else if (r.getType().equals("takeout")){
                icon.setImageResource(R.drawable.takeout);
            }
            else{
                icon.setImageResource(R.drawable.delivery);
            }

        }
}
}

此类是Restaurant.java：

public class Restaurant {
private String name="";
private String address="";
private Object type;

public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public String getAddress() {
    return address;
}
public void setAddress(String address) {
    this.address = address;
}
public void setType(String string) {
    // TODO Auto-generated method stub

}
public String toString(){
    return(getName());
}






}

最佳答案

将此添加到您的餐厅课程

public String getType() {
    return type;
}