在微调器中设置键和值

时间:2014-07-12 11:37:25

标签: android hashmap spinner

我有一个spiner,我想设置一个键和一个值,我使用HashMap,这是工作,但显示一行,如下所示:

enter image description here

代码:

        final View rootView = inflater.inflate(R.layout.fragment_photos, container, false);

    Spinner spin=(Spinner)rootView.findViewById(R.id.spinner1);

    HashMap<Integer, String> P_Hash=new HashMap<Integer, String>();

    Update Get_Information=new Update(rootView.getContext());

    ArrayList<String> Province_NAME=new ArrayList<String>();
    Province_NAME=Get_Information.GET_Province();

    ArrayList<Integer> Province_ID=new ArrayList<Integer>();
    Province_ID=Get_Information.Get_Province_ID();

    for (int i = 0; i < Province_ID.size(); i++)
    {
        P_Hash.put(Province_ID.get(i), Province_NAME.get(i));
        Log.d("Province_ID.get(i)", Province_ID.get(i)+"");
        Log.d(" Province_NAME.get(i)",  Province_NAME.get(i)+"");
    }


    ArrayAdapter<HashMap<Integer, String>> adapter = new ArrayAdapter<HashMap<Integer,String>>(rootView.getContext(), android.R.layout.simple_spinner_item);
    adapter.add(P_Hash);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    spin.setAdapter(adapter);

3 个答案:

答案 0 :(得分:118)

使用键和值填充微调器的更好方法应该是:

第1步:创建POJO类,它将处理键和值

public class Country {

    private String id;
    private String name;

    public Country(String id, String name) {
        this.id = id;
        this.name = name;
    }


    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }


    //to display object as a string in spinner
    @Override
    public String toString() {
        return name;
    }

    @Override
    public boolean equals(Object obj) {
        if(obj instanceof Country){
            Country c = (Country )obj;
            if(c.getName().equals(name) && c.getId()==id ) return true;
        }

        return false;
    }

}



注意: toString()方法很重要,因为它负责在微调器中显示数据,你可以根据需要修改toString()

第2步:准备要在微调器中加载的数据

 private void setData() {

        ArrayList<Country> countryList = new ArrayList<>();
        //Add countries

        countryList.add(new Country("1", "India"));
        countryList.add(new Country("2", "USA"));
        countryList.add(new Country("3", "China"));
        countryList.add(new Country("4", "UK"));

        //fill data in spinner 
        ArrayAdapter<Country> adapter = new ArrayAdapter<Country>(context, android.R.layout.simple_spinner_dropdown_item, countryList);
        spinner_country.setAdapter(adapter);
        spinner_country.setSelection(adapter.getPosition(myItem));//Optional to set the selected item.    
    }


第3步:,最后在微调器的onitemselected侦听器方法中获取所选项目的键和值

spinner_country.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

                 Country country = (Country) parent.getSelectedItem();
                 Toast.makeText(context, "Country ID: "+country.getId()+",  Country Name : "+country.getName(), Toast.LENGTH_SHORT).show();    
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {    
            }
        });


一切顺利,快乐编码!

答案 1 :(得分:82)

尝试使用 HashMap 存储键值对数据,在您的情况下微调项目索引为键省_ID为值即可。请查看以下示例以获取更多详细信息。

为微调器准备值

String[] spinnerArray = new String[Province_ID.size()];
HashMap<Integer,String> spinnerMap = new HashMap<Integer, String>();
for (int i = 0; i < Province_ID.size(); i++)
{
   spinnerMap.put(i,Province_ID.get(i));
   spinnerArray[i] = Province_NAME.get(i);
}

将值设置为微调器

ArrayAdapter<String> adapter =new ArrayAdapter<String>(context,android.R.layout.simple_spinner_item, spinnerArray);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);

获取微调器的价值

String name = spinner.getSelectedItem().toString();
String id = spinnerMap.get(spinner.getSelectedItemPosition());

答案 2 :(得分:1)

使用LinkedHashMap并将“要在微调器中显示的字符串”存储为键,并根据微调器的选择将要检索的对象存储为value。例如。 ,由于某种原因,您具有与微调项相关联的Float数据类型,请使用:

LinkedHashMap<String , Float> aMap = new LinkedHashMap<>(10);

然后对于微调框,我们可以将值设置为:

    ArrayList<String> values = new ArrayList<>(aMap.keySet());
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(getContext(), android.R.layout.simple_spinner_item,values);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner.setAdapter(adapter);

最后,在OnItemSelectedListener中,将float值检索为:

 @Override
 public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                aMap.get(adapterView.getItemAtPosition(i));
                
            }