VS2015(Xamarin)开发安卓WebApp笔记

manifest节点下
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.FLASHLIGHT" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />

SetContentView(Resource.Layout.Main);
webView = (WebView)FindViewById(Resource.Id.webView);
try
{
var dbPath = "/sdcard/zExpress/";
var dbFileName = "express.db";
//初始化sqlite本地库，将来升级加表
Common.InitDBAndUpdate(dbPath, dbFileName);
//html通过js访问后台C#
webView.AddJavascriptInterface(new WebInterface(this, dbPath, dbFileName, webView) as Java.Lang.Object, "CSharp");
//避免html
webView.SetWebViewClient(new CommonWebViewClient());
//js权限
WebSettings settings = webView.Settings;
settings.JavaScriptEnabled = true;
settings.JavaScriptCanOpenWindowsAutomatically = true; webView.LoadData("", "text/html", "utf-8");
webView.LoadUrl("file:///android_asset/index.html");
}
catch (Exception e)
{
Common.Log("OnCreate", e.Message + "\n" + e.StackTrace);
}

//webView返回 ，首页点返回 不做 webView返回处理，应该是退出
if (e.Action == KeyEventActions.Down && keyCode == Keycode.Back && webView.CanGoBack() && !webView.Url.ToLower().EndsWith("index.html"))
{
webView.GoBack(); //后退
return true; //已处理
} //再按一次退出程序
if (keyCode == Keycode.Back && e.Action == KeyEventActions.Down)
{
if (!lastBackKeyDownTime.HasValue || DateTime.Now - lastBackKeyDownTime.Value > new TimeSpan(, , ))
{
Toast.MakeText(this.ApplicationContext, "再按一次退出程序", ToastLength.Short).Show();
lastBackKeyDownTime = DateTime.Now;
}
else
{
Finish();
}
return true;
}
return base.OnKeyDown(keyCode, e);