在Xamarin中动态创建android Spinner [英] Create android spinner dynamically in Xamarin

问题描述

我是Xamarin的新手，我想创建一个简单的应用程序来熟悉Xamarin.我想创建并填充微调器，并动态显示其选项.我已经在此处中看到了文档，但是该文档不是通过编程方式创建的.任何帮助都会被告知

I'm a newbie to Xamarin and I want to create a simple application to get familiar with Xamarin. I want to create and populate the spinner and display it's options dynamically. I have seen the documentation here but it is not created programmatically. Any help will be apreaciated

var levels = new List<String>() { "Easy", "Medium", "Hard", "Multiplayer" };
var adapter = new ArrayAdapter<String>(this, Android.Resource.Layout.SimpleSpinnerItem, levels);
                    adapter.SetDropDownViewResource(Android.Resource.Layout.SimpleSpinnerDropDownItem);
var spinner = FindViewById<Spinner>(Resource.Id.spnrGameLevel);
spinner.Adapter = adapter;

spinner.ItemSelected += (sender, e) =>
{
    var s = sender as Spinner;
    Toast.MakeText(this, "My favorite is " + s.GetItemAtPosition(e.Position), ToastLength.Short).Show();
};

我的axml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Choose your game level" />
    <Spinner
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/spnrGameLevel" />
</LinearLayout>

推荐答案

要为Spinner动态创建项目，您需要具有

To dynamically create items for Spinner, you need to have an adapter.

最简单的适配器是 ArrayAdapter<T> .

The simplest adapter would be ArrayAdapter<T>.

这里是例子.

var items = new List<string>() {"one", "two", "three"};
var adapter = new ArrayAdapter<string>(this, Android.Resource.Layout.SimpleSpinnerItem, items);

设置adapter后，在视图中找到Spinner并将其设置为adapter.

After setting up the adapter, find the Spinner in your view and set adapter to it.

var spinner = FindViewById<Spinner>(Resource.Id.spinner);
spinner.Adapter = adapter;

这篇关于在Xamarin中动态创建android Spinner的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！