Spinner select android 工作室中的项目 [使用解析]

Question

我在 android studio 中使用 Spinner 时遇到问题我从 Parse.com 中检索我的数据，然后我获取列表数组并将其用作微调器，它正在工作但是当我尝试获取用户将 select 的值时出现问题我尝试了很多代码当我按下微调器中的项目时使用 [onItemSelectedListner 方法] 它不会 selected 并且不会显示为 selected

所以最后我使用了这段代码来查看 Query.findInTheBackground 中的微调器 ITEM，但是问题是我想获得用户 selected 的值但我不能！我应该怎么办？

还有一个问题，当显示微调器时，列表是白色的，我该如何更改颜色？！

这是我的代码

public class AppointmentDetailSelection extends Activity {

protected Spinner aSpinner;
protected  ArrayList<String> nameList =new ArrayList<>();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_appointment_detail_selection);

    aSpinner = (Spinner)findViewById(R.id.spinner);

    getDepartmentList();

}

public void getDepartmentList (){
    ParseQuery<ParseObject> query = ParseQuery.getQuery("Doctors");
    query.selectKeys(Arrays.asList("Department"));
    query.findInBackground(new FindCallback<ParseObject>() {
        @Override
        public void done(List<ParseObject> list, com.parse.ParseException e) {
            if (list == null) {
                Log.d("request failed.");
            } else {
                for (ParseObject comment : list) {
                    nameList.add(comment.getString("Department"));
                    Log.d("appointDate", "retrieved a related post");
                }
                ArrayAdapter adap = new ArrayAdapter(getApplicationContext(),android.R.layout.simple_list_item_1,nameList);
                aSpinner.setAdapter(adap);
            }
        }
    });
}

}

Answer 1

我建议查看 ParseQueryAdapter。我要做的是：

AppointmentDetailSelection:

public class AppointmentDetailSelection extends Activity {

protected Spinner aSpinner;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_appointment_detail_selection);
    aSpinner = (Spinner)findViewById(R.id.spinner);
    DoctorsAdapter adapter = new DoctorsAdapter(this);
    aSpinner.setAdapter(adapter);
    aSpinner.setSelection(0);

}

private class DoctorsAdapter extends ParseQueryAdapter {

        public DoctorsAdapter(final Context context) {
            super(context, new ParseQueryAdapter.QueryFactory<ParseObject>() {

                public ParseQuery create() {
                    ParseQuery query = new ParseQuery("Doctors");
                    query.selectKeys(Arrays.asList("Department"));
                    return query;
                }
            });
        }

        public class ViewHolder {
            TextView textView1;
            TextView textView2;
        }

        @Override
        public View getItemView(ParseObject object, View v, ViewGroup parent) {
            ViewHolder holder;
            if (v == null) {
                v = View.inflate(getContext(), R.layout.your_custom_layout, null);
                holder = new ViewHolder();
                holder.textView1 = (TextView)v.findViewById(R.id.textView1);
                holder.textView2 = (TextView)v.findViewById(R.id.textView2);
                v.setTag(holder);
            }
            else
                holder = (ViewHolder)v.getTag();

            holder.textView1.setText(object.getString("field_from_db1"));
            holder.textView2.setText(object.getString("field_from_db2"));

            return v;
        }
    }
}

your_custom_layout.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:background="@color/black"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="0dip"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textColor="@color/white"
        android:textStyle="bold"
        android:gravity="center"
        android:layout_gravity="center"
        android:textSize="18sp"
        android:id="@+id/textView1" />

    <TextView
        android:layout_width="0dip"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textColor="@color/white"
        android:textStyle="bold"
        android:gravity="center"
        android:layout_gravity="center"
        android:textSize="18sp"
        android:id="@+id/textView2" />

</LinearLayout>

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