Question

我已将数据传递给Spinner。这是我的JSON数据，

我有一个微调器，我在JSON下面传递这个。这是post方法的数据。

我的计划是在Spinner中获取以下数据。选择批处理后，我将单击下面的按钮，这将向下一个活动发送“Batch_Id”，它将从微调器中选择的“批处理”中获取“Batch_Id”。因为下一个活动希望Batch_Id从URL获取数据。

我已完成“批处理”的解析。但我陷入第二部分，我想根据批次选择发送Batch_Id。

[
{
  "Batch_Id": "1",
  "Batch": "2016-21"
},
{
  "Batch_Id": "2",
  "Batch": "2015-20"
},
{
  "Batch_Id": "3",
  "Batch": "2014-19"
},
{
  "Batch_Id": "4",
  "Batch": "2013-18"
},
{
  "Batch_Id": "5",
  "Batch": "2012-17"
},
{
  "Batch_Id": "6",
  "Batch": "2014-17"
},
{
  "Batch_Id": "7",
  "Batch": "2015-18"
},
{
  "Batch_Id": "8",
  "Batch": "2016-19"
}
]

我在Spinner中解析了“批处理”，现在我希望明确获得Batch_Id，就像我选择2016-19，然后我将得到“batch_id”等于8。

我试过了，

          final JSONArray jsonArraybatch = jsonArray.getJSONArray(1);
            JSONArray jsonArraysection = jsonArray.getJSONArray(2);
            JSONArray jsonArraysubject = jsonArray.getJSONArray(3);
            JSONObject jsonResponse = jsonArrayTeacherName.getJSONObject(0);
            teachername = jsonResponse.optString("teacher_name");
            teacherid = jsonResponse.optString("teacher_id");

            for (int i = 0; i < jsonArraybatch.length(); i++)

            {
                final JSONObject jsonObject = jsonArraybatch.getJSONObject(i);
                final Spinner mySpinner = (Spinner) findViewById(R.id.batch_spinner);

                String batch = jsonObject.optString("Batch");


                batchlist.add(batch);
                mySpinner
                        .setAdapter(new ArrayAdapter<String>(PutCredentials.this,
                                android.R.layout.simple_spinner_dropdown_item,
                                batchlist));

                mySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                    @Override
                    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                        selectedBatch = mySpinner.getItemAtPosition(position).toString();
                        batchid = jsonObject.optString("Batch_Id");


                    }

Answer 1

创建模型类：

c2

batchlist变量必须是BatchModel类型

class BatchModel{

 String batchId;

 String batchName;

}

SpinnerAdapter类

 ex: List<BatchModel> list= new ArrayList<>();


 String batch = jsonObject.optString("Batch");
 String batchid = jsonObject.optString("Batch_Id");

 BatchModel bm= new BatchModel();
 bm.batchId=batchid;
 bm.batch=batch;
 list.add(bm);

Answer 2

首先将此方法保留在外：

mySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                    @Override
                    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                        selectedBatch = mySpinner.getItemAtPosition(position).toString();
                        batchid = jsonObject.optString("Batch_Id");


                    }

现在您可以使用这个来查找您的batchid：

@Override


public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                        selectedBatch = mySpinner.getItemAtPosition(position).toString();
                        for(int i = 0;jsonArraybatch.length(); i++){
        JSONObject jsonObject = jsonArraybatch.getJSONObject(i);
       if (selectedBatch.equals(jsonObject.optString("Batch"))){
           batchid = jsonObject.optString("Batch_Id");
   }
}


                    }

Answer 3

您有两个选择

使用两个成员变量 Batch和batchName创建一个batchId骨架并为通过Array<Batch>
使用地图作为参考。

为微调器使用自定义适配器

<强>适配器

   public class SchoolSpinnerAdapter extends BaseAdapter {
   private ArrayList<School> mSchools;
   private Context mContext;

   public SchoolSpinnerAdapter(Context ctx, ArrayList<School> schools) {
       mContext = ctx;
       mSchools = schools;
   }

   @Override
   public int getCount() {
       return mSchools.size();
   }

   @Override
   public Object getItem(int position) {
       return mSchools.get(position);
   }

   @Override
   public long getItemId(int position) {
       return 0;
   }

   @Override
   public View getView(int position, View convertView, ViewGroup parent) {
       if (convertView == null) {
           LayoutInflater inf = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
           convertView = inf.inflate(R.layout.spinner_text, null);
       }
       ((TextView) convertView).setText(mSchools.get(position).getName());
       return convertView;
   }
}

布局膨胀

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android" 
style="?android:attr/dropDownItemStyle"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#000000"
android:background="#cccccc"
android:singleLine="true"
android:layout_width="match_parent"
android:layout_height="40dp"
android:ellipsize="marquee" />

将此适配器设置为微调器

spinner.setAdapter(new SchoolAdapter(this,schoollist));

使用地图作为参考

为微调器准备值

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

获取数据，来自微调器的项目选定项目。并通过onClick发送按钮

3 个答案: