Spinner не отображается

Question

Это функция, я пытаюсь использовать счетчик, данные, полученные из API, но проблема в том, что прядильщик не отображается. Я новичок в android.I приложил код ниже. меня решение. В коде нет никакой ошибки. Я печатаю массив, я получаю данные. Единственная проблема заключается в том, что выпадающее меню не отображается. Когда я нажимаю кнопку ответа на кнопку.

 @Override 
       public void onClick(View v) 
       { 
        String access=op.getUrl(getApplicationContext(),"ticket","update_properties",""); 
        JSONArray access_denied = null; 
        try 
        { 
         access_denied = new editProperties(access).execute().get(); 

        String access_result =access_denied.toString(); 
        if(access_result.equals("[\"Accessdenied\"]")) 
        { 
         Operation.showToast(getApplicationContext(), R.string.access); 
        } 
        else 
        { 
         //Log.d("In the else Condition : ","Success");  
         String DEPT_URL=op.getUrl(getApplicationContext(),"ticket","get_department","&vis_all_department=1"); 

         final String dept=tv_dept.getText().toString(); 
         filter_dept_id=tv_dept_id.getText().toString(); 

         if(v.getId()==R.id.td_tv_dept) 
         {  
          ArrayAdapter<String> dept_Adapter=op.get_dept_adapter(DEPT_URL,DEPARTMENT,Ticket_properties.this,domain_id); 

          final ArrayAdapter<String> dept_id_Adapter=op.get_dept_adapter(DEPT_URL,DEPARTMENT_ID,Ticket_properties.this,domain_id); 

          spin.setAdapter(dept_Adapter); 

          final int dept_Position = dept_Adapter.getPosition(dept); 



          spin.setSelection(dept_Position);//THIS ONE 
          spin.performClick();   

          spin.setOnItemSelectedListener(new OnItemSelectedListener() { 
           @Override 
           public void onItemSelected(AdapterView<?> parent, View view, 
            int pos, long id) { 
            // TODO Auto-generated method stub 
            String selected_item=parent.getItemAtPosition(pos).toString(); 
            String selected_item_id=dept_id_Adapter.getItem(pos).toString(); 

            String filter="&vis_ticket_id="+Ticket_id+"&vis_action=department&vis_update_id="+selected_item_id; 
            String UPDATE_DEPT_URL=op.getUrl(getApplicationContext(),"ticket","update_properties",filter); 

            JSONArray dept_array; 
            try 
            { 
             dept_array = new editProperties(UPDATE_DEPT_URL).execute().get(); 
             String result =dept_array.toString();      

             if(result.equals("[\"success\"]")) 
             {  
              tv_dept.setText(selected_item); 
              tv_dept_id.setText(selected_item_id);   
             } 
             else {Operation.showToast(getApplicationContext(), R.string.error);} 
            } catch (InterruptedException e) { 
             // TODO Auto-generated catch block 
             e.printStackTrace(); 


            } catch (ExecutionException e) { 
             // TODO Auto-generated catch block 
             e.printStackTrace(); 

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

           } 
          });  
         } 
         else if 
         { 
          //NEXT CODE 
         } 

// ***************************************** *****************************

  public ArrayAdapter<String> get_dept_adapter(String URL, String ITEM, Activity context,String domain_id) 
       { 
        // TODO Auto-generated method stub      
        JSONArray array ; 
        List<String> item_list = new ArrayList<String>(); 
        try { 
         array=new adapter(URL+"&vis_encode=json",context).execute().get(); 

         for (int i = 0; i <array.length(); i++) 
         {   
          JSONObject object; 
          try { 
           object = array.getJSONObject(i);    
           String new_domain_id=object.getString("domain_id"); 
           if(domain_id.equals(new_domain_id)) 
           { 
            String item=object.getString(ITEM); 
            item_list.add(item);  
           } 
          } catch (JSONException e1) { 
           // TODO Auto-generated catch block 
           e1.printStackTrace(); 
          } 
         } 

        } catch (InterruptedException e) { 
         // TODO Auto-generated catch block 
         e.printStackTrace(); 

        } catch (ExecutionException e) { 
         // TODO Auto-generated catch block 
         e.printStackTrace(); 

        } 

        ArrayAdapter<String> item_Adapter = new ArrayAdapter<String>(context, android.R.layout.simple_spinner_item,item_list); 
        item_Adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 

        return item_Adapter; 
       } 

// ************ ***********************************************

  Hello i just added the android:spinnerMode="dialog" 
      style="@android:style/Widget.Spinner.DropDown" these two lines and working fine. 

      Previous 
      ========== 
      <Spinner 
      android:id="@+id/td_spin" 
      android:layout_width="0dp" 
      android:layout_height="0dp" /> 

      After 
      ======= 
      <Spinner 
      android:id="@+id/td_spin" 
      android:layout_width="0dp" 
      android:layout_height="0dp" 
      android:spinnerMode="dialog" 
      style="@android:style/Widget.Spinner.DropDown" 
      /> 

Answer 1

Попробуйте этот код ...

XML файл

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:padding="10dip" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"> 

    <TextView 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:layout_marginTop="10dip" 
     android:text="Category:" 
     android:layout_marginBottom="5dp"/> 

    <Spinner 
     android:id="@+id/spinner" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:prompt="@string/spinner_title"/> 

</LinearLayout> 

Java файл

// Spinner element 
    Spinner spinner = (Spinner) findViewById(R.id.spinner); 

    // Spinner Drop down List (in your case set data from api) 
    List<String> categories = new ArrayList<String>(); 
    categories.add("Item 1"); 
    categories.add("Item 2"); 
    categories.add("Item 3"); 
    categories.add("Item 4"); 

    // Creating adapter for spinner 
    ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, categories); 

    // Drop down layout style - list view with radio button 
    dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 

    // attaching data adapter to spinner 
    spinner.setAdapter(dataAdapter); 

Answer 2

Добавьте это в макете

<RelativeLayout 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:layout_margin="16dp" 
       android:background="@drawable/spinner_border" 
       android:orientation="horizontal"> 

       <Spinner 
        android:id="@+id/select_model" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:layout_centerVertical="true" 
        android:layout_gravity="center" 
        android:background="@android:color/transparent" 
        android:gravity="center" 
        android:layout_marginLeft="5dp" 
        android:spinnerMode="dropdown" /> 

       <ImageView 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_alignParentRight="true" 
        android:layout_centerVertical="true" 
        android:layout_gravity="center" 
        android:src="@drawable/ic_arrow_drop_down_black_24dp" /> 

      </RelativeLayout> 

CREAT spinner_border.xml в вашей вытяжке папке

<shape xmlns:android="http://schemas.android.com/apk/res/android"> 
<solid android:color="@android:color/transparent" /> 
<corners android:radius="5dp" /> 
<stroke 
    android:width="1dp" 
    android:color="@android:color/darker_gray"/> 
</shape> 

установки блесну, как это в вашем activity.java

private void setUpSpinner(ArrayList<String> mModels){ 
    modelSpinnerAdapter = new SelectionListAdapter(this, mModels); 
    dropdown.setAdapter(modelSpinnerAdapter); 
    dropdown.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
     @Override 
     public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 
      // model = parent.getSelectedItem().toString(); 
     } 

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

     } 
    }); 


} 

и это SelectionListAdapter.java

public class SelectionListAdapter extends BaseAdapter { 
private Context context; 
private List<String> listItemTitles; 
public SelectionListAdapter(Context context, List<String> listItemTitles) { 
    this.context = context; 
    this.listItemTitles = listItemTitles; 
} 

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

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

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

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    if (convertView == null) { 
     LayoutInflater layoutInflater = (LayoutInflater)this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     convertView = layoutInflater.inflate(R.layout.selector_row_item, parent, false); 
    } 
    TextView listItemTitleView = (TextView)convertView.findViewById(R.id.selector_item_texiView); 
    listItemTitleView.setText(listItemTitles.get(position).toUpperCase()); 
    return convertView; 
} 

}

select_row_item.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android = 
"http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="35dp"> 
    <TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_centerInParent="true" 
    android:text="Title" 
    android:textColor="@color/md_black_1000" 
    android:textSize="14sp" 
    android:id="@+id/selector_item_texiView" /> 
</RelativeLayout>