如何从另一个列表视图活动在列表视图活动中多次添加项

Question

这是我的原始ListView类，我从列表中选择一个项目，但我想选择相同的项目4次，然后在另一个活动中，它应该添加该项目4次。我可以在另一个活动中添加一次。我使用共享首选项进行添加。谁能帮我如何将值存储 4 次？任何提示将不胜感激:(（（ 谢谢

这是我选择项目的类

public class Alcohol extends Activity {
private List<Alcohols> alcohol = new ArrayList<Alcohols>();
String wine;
    String beer;
SharedPreferences someData;
public static String filename = "MySharedString";
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_alcohol);
    someData = getSharedPreferences(filename, 0);
    AlcoholList();
    AlcohollistView();
    registerClickCallBack();
}
private void registerClickCallBack() {
    // TODO Auto-generated method stub
    ListView list = (ListView) findViewById(R.id.AlcoholListView);
    list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View viewClicked,
                int position, long id) {
            switch (position) {
            case 0:
                wine = "wine";
                SharedPreferences.Editor editor0 = someData.edit();
                editor0.putString("sharedString4", wine);
                editor0.commit();
                                    otherActivity("list");
                break;
            case 1:
                    beer = "beer";
                SharedPreferences.Editor editor1 = someData.edit();
                editor1.putString("sharedString5", beer);
                editor1.commit();
                                    otherActivity("list");
                break;
            }
});
}
private void AlcohollistView() {
    // TODO Auto-generated method stub
    ArrayAdapter<Alcohol> adapter = new MyListAdapter();
    ListView list = (ListView) findViewById(R.id.AlcoholListView);
    list.setAdapter(adapter);
}
private class MyListAdapter extends ArrayAdapter<Pilstyper> {
    public MyListAdapter() {
        super(Alcohol.this, R.layout.list_item_view, alcohol);
    }
    public View getView(int position, View convertView, ViewGroup parent) {
        View itemView = convertView;
        if (itemView == null) {
            itemView = getLayoutInflater().inflate(
                    R.layout.activity_item_view, parent, false);
        }
        Alcohol alcohol = alcohol.get(position);
        ImageView imageView = (ImageView) itemView
                .findViewById(R.id.wine);
        imageView.setImageResource(alcohol.getIkonId());
        // Text
        TextView text = (TextView) itemView.findViewById(R.id.text_wine);
        text.setText(alcohol.getText());
        return itemView;
    }
}
private void AlcoholList() {
    // TODO Auto-generated method stub
    alcohol.add(new Alcohol("Wine", R.drawable.wine));
    alcohol.add(new Alcohol("Beer", R.drawable.beer));
}
public void otherActivity(String a) {
    Intent i = new Intent();
    if (a.equals("list")) {
        i.setClass(getApplicationContext(), list.class);
    }
    startActivity(i);
    finish();
}
}

这是另一个列表视图类，如果我在上一个类中选择了四次项目，我想在其中添加 4 次项目。我只能添加一次：//

 public class list extends Activity {
private List<Alcohol> alcohol = new ArrayList<Alcohol>();
ArrayAdapter<Alcohol> adapter;
SharedPreferences someData;
public static String filename = "MySharedString";
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_item);
     someData = getSharedPreferences(filename, 0);
      String wine = someData.getString("sharedString4", "ooo");
               String beer = someData.getString("sharedString5", "ooo");
      if(wine.equals("wine")){
          alcohol.add(new Alcohol("Wine", R.drawable.wine));
      }else if(wine.equals("wine")){
          alcohol.add(new Alcohol("Beer", R.drawable.beer));
      } 
}

Answer 1

在侧面 onItemClick（） 中只存储要传递给数组列表中的其他活动的值。像list.add（）一样，然后使用一种提交类型的通用按钮移动到其他活动。五月可以放在你的列表视图之后。并有意地传递该列表。

Answer 2

如果这就像添加到购物车类型，则将每个选择保存到表或对象中，该对象可由您以前的活动访问，并将其加载到Resume或onStart上。