Question

我是android的新手并尝试创建一个简单的Android应用程序。我在Visual Studio 2017和Xamarin中创建了这个Android应用程序。

在该应用程序中，我添加了一个列表视图，在点击列表视图的项目时，它会打开一个新活动。当我清理并构建应用程序时，它成功了。

我存档了该应用程序，并尝试在我的手机上进行测试。它会立即打开并关闭。

以下是参考代码： -

activity_main.axml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:minWidth="25px"
    android:minHeight="25px">
    <ImageView
        android:background="@drawable/done"
        android:layout_width="match_parent"
        android:layout_height="150px"
        android:id="@+id/imageView1"
        android:layout_alignParentTop="true" />
    <ListView
        android:minWidth="25px"
        android:minHeight="25px"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/listView1"
        android:layout_below="@id/imageView1" />
</RelativeLayout>

MainActivity.cs

using Android.App;
using Android.Widget;
using Android.OS;
using Android.Support.V7.App;
using Android.Content;
using System;

namespace IH_Main
{
    [Activity(Label = "MyApplication", Theme = "@android:style/Theme", MainLauncher = true)]
    public class MainActivity : AppCompatActivity
    {
        string[] tool_array = {"Name1","Name2","Name3" };
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.activity_main);

            //Adding items in the list view using Array adapter
            //Created an ArrayAdapter to store the list into Adapter so that we can set list string onto the list view.
            ArrayAdapter<string>tools_list = new ArrayAdapter<string>(this,Android.Resource.Layout.SimpleListItem1,Android.Resource.Id.Text1,tool_array);

            //Creating listview instance.
            ListView listView = (ListView)FindViewById(Resource.Id.listView1);

            //Setting adapter values to the listview.
            listView.SetAdapter(tools_list);

            listView.ItemClick += listView_ItemClick;
        }

        private void listView_ItemClick(object sender, AdapterView.ItemClickEventArgs e)
        {
            Toast.MakeText(this, e.ToString(), ToastLength.Long).Show();
            Intent i = new Intent(this,typeof(info_display));
            i.PutExtra("Tool_Name", e.ToString());
            StartActivity(i);
        }
    }
}

Layout1.axml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:minWidth="25px"
    android:minHeight="25px">
    <ImageView
        android:background="@drawable/done"
        android:layout_width="match_parent"
        android:layout_height="150px"
        android:id="@+id/imageView1"
        android:layout_alignParentTop="true" />
    <TextView
        android:minWidth="25px"
        android:minHeight="25px"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/tool_title"
        android:layout_below="@id/imageView1" />
</RelativeLayout>

Info_display.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;

namespace IH_Main
{
    [Activity(Label = "info_display")]
    public class info_display : Activity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            // Create your application here
            SetContentView(Resource.Layout.layout1);
            TextView t1 = FindViewById<TextView>(Resource.Id.tool_title);
            string tool_name = Intent.GetStringExtra("Tool_Name");
            t1.Text = tool_name;

        }
    }
}

在执行＆＃34; Build＆＃34;时，我收到以下警告。

＆＃39; AbsListView.SetAdapter（IListAdapter）＆＃39;已经过时了：＆＃39;请使用适配器属性设置器＆＃39;

在MainActivity.cs的以下行

listView.SetAdapter（tools_list）;

这种行为的可能原因是什么？任何帮助都会很明显：）

Answer 1

我可以通过更改以下行的语法来解决此问题：

listView.SetAdapter(tools_list);

至：

listView.Adapter = tools_list;

在Xamarin C＃中打开后，Android应用程序立即关闭

1 个答案: