Android：如何从下拉框中获取所选项目的ID？

Question

在我的情况下，我想从Spinner中获取所选项的Id。我的模型类中有两个字段，即id和name。我列出了所有数据并将其设置为适配器的列表。我尝试使用getSelectedItem()方法获取所选项的Id，但是我只能得到项目清单中的第一个id。

这是我的代码。

public class ModifyEventFragment extends DialogFragment{
Context context;
CalEvent eve;
Project proj;
Spinner eventType,stage;
public static String eid,pid,type;
public static List<EventType> event_type;
public static List<ProjectStatus> cust_stage;
EditText where,when,who,notes;
String eve_type,stage_val,when_val,who_val,notes_val;
String modified_where,modified_who,modified_when,modified_notes;
public ModifyEventFragment(Project proj)
{
    this.proj=proj;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.modify_project_event, container,
            false);
    context = rootView.getContext();
    eventType = (Spinner) rootView.findViewById(R.id.modifyEventType);
    stage =(Spinner) rootView.findViewById(R.id.modifyStage);
    where = (EditText)rootView.findViewById(R.id.modifyWhere);
    who = (EditText)rootView.findViewById(R.id.modifyWho);
    when = (EditText)rootView.findViewById(R.id.modifyWhen);
    notes =(EditText) rootView.findViewById(R.id.modifyNotes);
    eve = CalEvent.getCalEvent(ProjectEventFragment.calevent.eve_id);
    event_type = EventType.listAll();
    CustomEventTypeAdapter adapter = new CustomEventTypeAdapter(context, event_type);
    eventType.setAdapter(adapter);
    type=((EventType)eventType.getSelectedItem()).et_id;
    cust_stage = ProjectStatus.listAll();
    CustomStatusAdapter adapter1 = new CustomStatusAdapter(context, cust_stage);
    stage.setAdapter(adapter1);
    where.setText(eve.followup_location.toString());
    where.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            // TODO Auto-generated method stub

        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable s) {
            // TODO Auto-generated method stub
            modified_where = s.toString();
        }
    });
    who.setText(eve.person_met.toString());
    who.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            // TODO Auto-generated method stub

        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable s) {
            // TODO Auto-generated method stub
            modified_who = s.toString();
        }
    });
    when.setText(eve.event_start.toString());
    when.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            // TODO Auto-generated method stub

        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable s) {
            // TODO Auto-generated method stub
            modified_when = s.toString();
        }
    });
    notes.setText(eve.notes.toString());
    notes.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            // TODO Auto-generated method stub

        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable s) {
            // TODO Auto-generated method stub
            modified_notes = s.toString();
        }
    });
    Button save = (Button) rootView.findViewById(R.id.modifyeventsave);

    save.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            eve.followup_location = modified_where;
            eve.event_start = modified_when;
            eve.person_met = modified_who;
            eve.notes = modified_notes;
            System.out.println("print type"+type);
            eve.save();
            ProjectEventFragment.adapter.notifyDataSetChanged();
        }
    });

    return rootView;
}

这是CustomEventType适配器代码。

public class CustomEventTypeAdapter extends BaseAdapter{
Context ctx;
List<EventType> ps;
LayoutInflater inflater;
public CustomEventTypeAdapter(Context ctx,List<EventType> ps)
{
    this.ctx=ctx;
    this.ps=ps;
    inflater = (LayoutInflater) ctx
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
}
@Override
public int getCount() {
    // TODO Auto-generated method stub
    return ps.size();
}

@Override
public EventType getItem(int position) {
    // TODO Auto-generated method stub
    return ps.get(position);
}

@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return ps.get(position).getId();
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View rowView = convertView;
    if (convertView == null)
        rowView = inflater.inflate(R.layout.spinner_item_local, parent,
                false);
    TextView textView = (TextView) rowView.findViewById(R.id.spinner_item_text);

    EventType proj = getItem(position);
    try {
        textView.setText(proj.name);

    } catch (Exception e) {

    }

    return rowView;
}

有人可以帮我解决这个问题吗？

这个问题与IT技术有关。

- user3764346

Answer 1

我会分享我的课堂示例代码，用于获取选定项的ID -

spinner1 .setOnItemSelectedListener(new OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                // TODO Auto-generated method stub
                spinner1 = parent.getItemAtPosition(position).toString();
                count = position; //this would give you the id of the selected item
            }

            @Override
            public void onNothingSelected(AdapterView<?> arg0) {
                // TODO Auto-generated method stub
            }
        });

干杯:)

- Ashish Tamrakar

Answer 2

使用位置从适配器列表持有者获取所选项目数据：

eventType.setOnItemSelectedListener(new OnItemSelectedListener() {
     @Override
     public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
         String id = event_type.get(position).getId();
     }

     @Override
     public void onNothingSelected(AdapterView<?> arg0) {

     }
});

- Haresh Chhelana

Answer 3

使用view.OnItemSelectedListener在您的Spinner上，您将获得一个int类型的位置，您可以将其用作所选项目的ID。

- Pankaj Nimgade

Answer 4

你有一个名为 ProjectStatus 的 Java Bean。现在在其中重写 String toString() 方法。

public class ProjectStatus {

    private Integer id; // Long, String any type

    private String name;

    // more properties if you need

    @Override  // Mandatory
    public String toString() {
        return name; // name + " ("+id+")"; //  can also be returned
    }

    // Getter & Setter
}

然后创建一个 ArrayAdapter<ProjectStatus>，并将其设置到 Spinner 中，以加载状态选项。

//Task 1.
List<ProjectStatus> cust_stages = ProjectStatus.listAll(); // Or using any JSON Data OR API call;

//Task 2.
ArrayAdapter<ProjectStatus> statusAdapter = new ArrayAdapter<ProjectStatus>(
        this, android.R.layout.simple_spinner_item, cust_stages
    );
statusAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

//Task 3.
Spinner stage =(Spinner) rootView.findViewById(R.id.modifyStage);
stage.setAdapter(statusAdapter);

现在可以像下面这样，在任何点击/更改事件中获取所选ProjectStatus及其属性。

// In any OnClick / OnSelect event
ProjectStatus selectedStatus = (ProjectStatus) stage.getSelectedItem();
Integer statusId = selectedStatus.getId();
String statusName = selectedStatus.getName();
// and if you have more properties

- Mr. Mak