大叔也说Xamarin~Android篇~调用远程API接口，发POST请求

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Xamarin我们在上节已经教大家如何去部署它的环境了，今天来说一个实际的例子，使用android客户调用.net web api的一个接口，并发送POST请求，当服务端回到请求后做出响应，客户端android将响应的内容输出，并跳换到别一个Activity页面，在新视图上加载网页内容到webView控件上，整个流程结束！

一 在主页面上添加几个表单元素，账号，密码，登陆按钮，并在Activity类的OnCreate方法中为它们赋值，并添加按钮的click事件

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

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

            // Get our button from the layout resource,
            // and attach an event to it
            Button button = FindViewById<Button> (Resource.Id.myButton);

            button.Click += delegate {
                button.Text = string.Format ("{0} clicks!", count++);
            };
            Android.Util.Log.Info ("normal", "日志zzl");
            var loginBtn = FindViewById<Button> (Resource.Id.loginBtn);
            var username = FindViewById<TextView> (Resource.Id.username);
            var password = FindViewById<TextView> (Resource.Id.password);
            var result = FindViewById<TextView> (Resource.Id.result);
            loginBtn.Click += delegate {

                string url = "http://api.xuexiba.com/v1/User/Login";
                //创建HttpClient（注意传入HttpClientHandler）
                using (var http = new HttpClient ()) {
                    var content = new FormUrlEncodedContent (new Dictionary<string, string> () {
                        { "username",username.Text },
                        { "password",password.Text }

                    });

                    var response = http.PostAsync (url, content);
                    result.Text = response.Result.Content.ReadAsStringAsync ().Result;
                 Intent intent = new Intent(this, typeof(ViewPageActivity));
                 StartActivity(intent);

                }
            };
        }

二 在ViewPageActivity里添加一个webView用来显示网页的内容，如下代码

    protected override void OnCreate (Bundle savedInstanceState)
        {
            base.OnCreate (savedInstanceState);
            SetContentView (Resource.Layout.ViewPage);
            var webView = FindViewById<WebView> (Resource.Id.webView);
            //启用Javascript Enable
            webView.Settings.JavaScriptEnabled = true;
            //载入网址
            webView.LoadUrl ("http://www.sina.com");
            //直接在当前webView上打开
             webView.SetWebViewClient (new CustWebViewClient ());

        }

注意，代码webView.SetWebViewClient (new CustWebViewClient ())表示使用现有的webView加载网页内容，而如果不加这行，那么网页将使用系统自带的浏览器进行加载，

下载看一下CustWebViewClient 这个类的内容

public class CustWebViewClient : WebViewClient
    {
        public override bool ShouldOverrideUrlLoading (WebView view, string url)
        {
            view.LoadUrl (url);
            return true;
        }

    }

OK，在我们设计页面时，可以直接从工具箱上进行拖动，最后布局向这样

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" 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最后进行APK的生成，我们的程序包就算完成了！

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