Question

我正在使用Xamarin，我通过XML布局文件加载了TextView，其代码如下：

SetContentView (Resource.Layout.TextView);

在屏幕上加载TextView后，如何更改TextView的文本？如何通过代码引用TextView，因为我还没有将其声明为变量？

我试过没有结果：

TextView PhoneNumber = (TextView)FindViewById(Resource.Layout.TextView);
PhoneNumber.Text = "This is a phone number: 0800 64 64 64";

TextView根本不会显示在屏幕上。

我可以请一些帮助吗？

提前致谢。

Answer 1

替换它：

SetContentView (Resource.Layout.TextView);

和

TextView PhoneNumber = (TextView)FindViewById(Resource.Layout.TextView);
PhoneNumber.Text = "This is a phone number: 0800 64 64 64";

用这个：

SetContentView (Resource.Layout.Your_Layout_Name);

和

TextView PhoneNumber = (TextView)FindViewById(Resource.id.TextView);
PhoneNumber.setText("This is a phone number: 0800 64 64 64");

Answer 2

在xml中声明TextView。使用java中的id和setText进行重复

PhoneNumber.setText("This is a phone number: 0800 64 64 64");

Answer 3

同样的问题不会出现指定的值。

public class MainActivity : Activity
{
    public string mess;

    protected override void OnCreate (Bundle bundle)
    {
        base.OnCreate (bundle);

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


        Button bt = FindViewById<Button>(Resource.Id.button1);
        bt.Click += delegate { start();};
        // Get our button from the layout resource,
        // and attach an event to it
        }
    public void start()
    {
        TextView text = FindViewById<TextView> (Resource.Id.textView1);


        StartListening();
        text.Text = mess;
        //text.SetText (mess);
    }
    private readonly UdpClient udp = new UdpClient(45000);

    public void StartListening()
    {
        this.udp.BeginReceive(Receive, new object());




    }
    public void Receive(IAsyncResult ar)
    {
        IPEndPoint ip = new IPEndPoint(IPAddress.Any, 45000);
        byte[] bytes = udp.EndReceive(ar, ref ip);


        mess = Encoding.ASCII.GetString(bytes);
        StartListening();

    }
}
    }

更改TextView的文本

3 个答案: