如何使用 Java 在 Android 中生成 Spinner？

Question

我想從我的 Java 代碼向我的 android 應用程序添加一個微調器，而無需觸摸 xml 文件，所以我進行了一些搜索並找到了一些可以執行其中一些操作的代碼，但它仍然使用“findViewById”來從中獲取微調器xml，我將其替換為： Spinner spinner = new Spinner(context);

然而在代碼中它有“R.layout.spinner_item”，在我的情況下如何繞過它？ 代碼如下所示：

final Spinner spinner = new Spinner(context);
String[] plants = new String[]{"Laceflower", "California sycamore", "Mountain mahogany", "Butterfly weed", "Carrot weed"};
final List<String> plantsList = new ArrayList<>(Arrays.asList(plants));
final ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(this, R.layout.spinner_item, plantsList)     <--- ?
{
  @Override
  public View getDropDownView(int position, View convertView, ViewGroup parent)
  {
    View view = super.getDropDownView(position, convertView, parent);
    TextView tv = (TextView) super.getDropDownView(position, convertView, parent);
    if (position % 2 == 1)
    {
      tv.setTextColor(Color.parseColor("#FF7C7967"));
      tv.setBackgroundColor(Color.parseColor("#FFC3C0AA"));
    }
    else
    {
      tv.setTextColor(Color.parseColor("#FF657A86"));
      tv.setBackgroundColor(Color.parseColor("#FFB5DCE8"));
    }
    return view;
  }
};

spinnerArrayAdapter.setDropDownViewResource(R.layout.spinner_item);     <--- ?
spinner.setAdapter(spinnerArrayAdapter);

Answer 1

更新您的代碼，如下所示，在運行時創建Spinner ，無需layout文件

//Create spinner dynamically
Spinner spinner = new Spinner(context);

//Ready your data for spinner
String[] plants = new String[]{"Laceflower", "California sycamore", 
        "Mountain mahogany", "Butterfly weed", "Carrot weed"};

//Create ArrayAdapter for spinner with system default layout for views
ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(
        this, 
        android.R.layout.simple_spinner_item, 
        plants
);

//Attach adapter to spinner
spinner.setAdapter(spinnerArrayAdapter);