与 Spinner 确认

Question

下面的代码允许用户选择 A、B、C 或 D。我希望代码在选择 D 时弹出确认，确认要求是继续或否返回。

这可能吗？

Spinner dropdown = (Spinner)findViewById(R.id.spinner1);
String[] items = new String[]{"A","B", "C", "D"};
adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item, items);    

dropdown.setAdapter(adapter);

dropdown.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
{
    /**
    * Called when a new item is selected (in the Spinner)
    */
    public void onItemSelected(AdapterView<?> parent, View view,int pos, long id)
    {


    } 
}

Answer 1

正如乔 C 所说，是的。

public void onItemSelected(AdapterView<?> parent, View view,int pos, long id){
    String selected = items[id]
    if(selected.equals("D")){
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        builder.setTitle("Confirmation");
        builder.setPositiveButton("Yes", null);
        builder.setNegativeButton("No", null);
        builder.show();
    }
} 

你应该在“null”的地方添加一个监听器......

Answer 2

一旦选择了一个项目，您就可以创建一个 AlertDialog。这是代码。

public void onItemSelected(AdapterView<?> parent, View view,int pos, long id)
{
    String selected = items[id]
    if(selected.equals("D")){
        new AlertDialog.Builder(this)
      .setTitle("Are you sure?")
      .setMessage("If you go back you will loose any changes.")
      .setPositiveButton("Yes", (dialog, which) -> {
          // doSomething();
          dialog.dismiss();
      })
    .setNegativeButton("No", (dialog, which) -> dialog.dismiss())
    .show();
    }
}

按下是按钮时，使用您想要的代码更改 doSomething() 方法。谢谢。