別のSpinnerアイテムを選択したときのSpinnerのテキストカラーの変更

Question

アイテムが別のスピナーから選択されたときに、AppCompatSpinnerのテキストの色を変更する必要があります。カテゴリアダプタの

enter image description here

AppCompatSpinner（categorySpinner）

AppCompatSpinner（fromSpinner）

categorySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
     @Override 
     public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 
      switch (position) { 
       case 0: 
        //Setting the upper adapter according to the category. 
        lengthAdapter = new SpinnerAdapter(getApplicationContext(), lengthList); 
        lengthAdapter.setDropDownViewResource(R.layout.item_dd_r); 
        fromSpinner.setAdapter(lengthAdapter); 

     //Need to add code to change the Text Color of fromSpinner. 
     ... 
} 
CategorySpinnerAdapter adapter = new CategorySpinnerAdapter(this, categoriesList); 
adapter.setDropDownViewResource(R.layout.cat_dd_r); 
categorySpinner.setAdapter(adapter); 

コード -

パブリッククラスCategorySpinnerAdapterはArrayAdapter {

private Context context; 
private List<String> categoryItemList; 

public CategorySpinnerAdapter(Context context, List<String> categoryItemList) { 
    super(context, 0, categoryItemList); 
    this.context = context; 
    this.categoryItemList = categoryItemList; 
} 

@NonNull 
@Override 
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) { 
    String item = categoryItemList.get(position); 

    View view = convertView; 
    if (view == null) { 
     view = LayoutInflater.from(parent.getContext()).inflate(R.layout.spinner_item_convert_cat, parent, false); 
    } 

    TextView spinnerText = view.findViewById(R.id.textView_spinnerItem_cat); 
    spinnerText.setText(item); 

    return view; 
} 

@Override 
public View getDropDownView(int position, @Nullable View convertView, @NonNull ViewGroup parent) { 
    TextView dropDownText = (TextView) super.getDropDownView(position, convertView, parent); 
    return dropDownText; 
} 
} 

を拡張

Answer 1

ここfirstSpinner

boolean selected = false; 

firstSpinner.setOnItemSelectedListener(
     new AdapterView.OnItemSelectedListener() { 
      @Override 
      public void onItemSelected(AdapterView<?> adapterView, View view, 
        int position, long l) { 

       if (position != 0) { 
        if (!selected) selected = true; 
        secondSpinner.post(new Runnable() { 
         @Override 
         public void run() { 
          ((TextView) ((ViewGroup) secondSpinner.getSelectedView()).getChildAt(0)) 
            .setTextColor(Color.BLACK); 
         } 
        }); 
       } 
      } 

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

secondSpinner.setOnItemSelectedListener(
     new AdapterView.OnItemSelectedListener() { 
      @Override 
      public void onItemSelected(AdapterView<?> adapterView, View view, 
        int position, long l) { 

       if (selected) { 
        secondSpinner.post(new Runnable() { 
         @Override 
         public void run() { 
          ((TextView) ((ViewGroup) secondSpinner.getSelectedView()).getChildAt(0)) 
            .setTextColor(Color.BLACK); 
         } 
        }); 
       } 
      } 

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