Question

我正在关注ListView的教程。在教程中有一个TextView，它包含固定的单词'description'，然后是前面的字符串'country'的子集。

我一直在尝试用另一个TextView替换它; '货币'而不是'描述'与每个相应的货币，但我无法弄清楚如何。

感谢任何帮助

以下是教程的列表视图代码：

MainActivity.java

public class MainActivity extends Activity{

ListView list;
String[] country={
        "France",
        "India",
        "Germany",
        "The US",
        "Japan",
        "Korea",
        "China",
        "Canada"
    };

Integer[] countryid={
        R.drawable.pic1,
        R.drawable.pic2,
        R.drawable.pic3,
        R.drawable.pic4,
        R.drawable.pic5,
        R.drawable.pic6,
        R.drawable.pic7,
        R.drawable.pic8,
};
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    CustomListAdapter adapter=new CustomListAdapter(this, country, countryid);
    list=(ListView)findViewById(R.id.list);
    list.setAdapter(adapter);

    list.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
            // TODO Auto-generated method stub
            String Slectedcountry= country[+position];
            Toast.makeText(getApplicationContext(), Slectedcountry, Toast.LENGTH_SHORT).show();

        }
    });
}
}

CustomListAdapter.java

public class CustomListAdapter extends ArrayAdapter<String> {

private final Activity context;
private final String[] country;
private final Integer[] countryid;

public CustomListAdapter(Activity context, String[] country, Integer[] countryid) {
    super(context, R.layout.mylist, country);

    this.context=context;
    this.country=country;
    this.countryid=countryid;
}

public View getView(int position,View view,ViewGroup parent) {
    LayoutInflater inflater=context.getLayoutInflater();
    View rowView=inflater.inflate(R.layout.mylist, null,true);

    TextView txtTitle = (TextView) rowView.findViewById(R.id.item);
    ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);
    TextView extratxt = (TextView) rowView.findViewById(R.id.textView1);

    txtTitle.setText(country[position]);
    imageView.setImageResource(countryid[position]);
    extratxt.setText("Description "+country[position]); //I want to replace this

    return rowView;

};
}

Answer 1

你需要

在 mylist.xml 中添加视图。（查看货币）
（ CustomListAdapter.java ）添加一行来查找/获取视图（以便能够设置视图项）。与TextView txtTitle = (TextView) rowView.findViewById(R.id.item);
使用新数组值向适配器添加另一行（ CustomListAdapter.java ）以设置找到的视图。与txtTitle.setText(country[position]);

修改main（ MainActivity.java ）以设置新的数组值。类似的东西： -

String[] currency={
    "Franc",
    "Rupee",
    "pfenning",
    "Greenback",
    "yen",
    "something",
    "something else",
    "Pound"
};

Answer 2

首先创建一个对象类，它存储国家，图像和货币等数据。

public class CountryObject{

public String country_Name;
public String country_Currency;
public int country_Image;

}

然后是ModelObject的创建arraylist。 List<CountryObject> countryList= new ArrayList<CountryObject>();

CountryObject object1= new CountryObject;

    object.country_Name="India";

    object.country_currency="Rupee";

    cobject.country_Image=R.drawable.pic1;

    countryList.add(object1);

创建类似的CountryObject添加到arraylits。将它传递给适配器类以使用listview进行出价。

 CustomListAdapter adapter=new CustomListAdapter(this, countryList);

您的适配器类。请使用Viewholder模式减少getview方法中的调用，建议使用。

    public class CustomListAdapter extends BaseAdapter {

    private final Activity context;
     List<CountryObject> countrylist

    public CustomListAdapter(Activity context, List<CountryObject> list) {


        this.context=context;
        this.countrylist=list;
    }
    @Override
        public long getItemId(int position) {

            return position;
        }

        @Override
        public CountryObject getItem(int position) {

            return countrylist.get(position);
        }
     @Override
        public int getCount() {
            return countrylist!= null ? countrylist.size() : 0;
        }
    public View getView(int position,View convertView,ViewGroup parent) {


     final ViewHolder holder;
            if (convertView == null) {
                LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                convertView = inflater.inflate(R.layout.mylist, parent, false);
                holder = new ViewHolder();
                holder.tvName = (TextView) convertView.findViewById(R.id.item);
                holder.ivCountryImage = (ImageView) convertView.findViewById(R.id.icon);
                holder.tvCurrency = (TextView) convertView.findViewById(R.id.textView1);


                convertView.setTag(holder);

            } else {
                holder = (ViewHolder) convertView.getTag();
            }

       holder.tvName.setText(countrylist.get(position).country_Name);
       holder.ivCountryImage.setImageResource(countrylist.get(position).country_Image);

    //holder.tvCurrency.setText("currency "+countrylist.get(position).country_Currency);
       holder.tvCurrency.setText(countrylist.get(position).country_Currency); 

        return convertView;

    }

 public class ViewHolder {

        TextView tvName, tvCurrency;
        ImageView ivCountryImage;

    }

}

或者你可以使用ArrayAdapter而不是String。

将参数添加到ListView

2 个答案: