微調框setOnItemClickListener崩潰了嗎？

Question

holder.spinner_teacher_name=(Spinner) rowView.findViewById(R.id.spinner_teacher_name); 

    holder.spinner_teacher_name=(Spinner) rowView.findViewById(R.id.spinner_teacher_name); 

    arrayAdapter=new ArrayAdapter<String>(rowView.getContext(), android.R.layout.simple_spinner_item,teacher_name); 
    arrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
    holder.spinner_teacher_name.setAdapter(arrayAdapter); 
    holder.spinner.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 

    Toast.makeText(rowView.getContext(), "You Clicked "+class_room[position], Toast.LENGTH_SHORT).show(); 
     } 
    }); 

Answer 1

你應該選擇使用監聽器，而不是當用戶selects從drop-down項目時，Spinner對象收到on-item-selected事件點擊收聽

spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() 
     { 
      public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) 
      { 
      String selected_item = parent.getItemAtPosition(pos).toString(); 
      Log.d("TAG", "_log : item_selected : " + selected_item); 
      } 

      public void onNothingSelected(AdapterView<?> parent) 
      { 

      } 
     }); 

Answer 2

。

要定義spinner的selection事件處理程序，請實現AdapterView.OnItemSelectedListener接口和相應的onItemSelected()回調方法。

請參閱documentation。

用途：

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

     Toast.makeText(rowView.getContext(), "You Clicked " + class_room[position], Toast.LENGTH_SHORT).show(); 
    } 

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

    } 
}); 

相反的：

holder.spinner.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
    @Override 
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 

     Toast.makeText(rowView.getContext(), "You Clicked "+class_room[position], Toast.LENGTH_SHORT).show(); 
    } 
});