李小柯,襄阳市中考成绩查询,滚擂台
url_launcher是用于在移动平台中启动url的flutter插件，适用于ios和android平台。他可以打开网页，发送邮件，还可以拨打电话。
github地址：
最近项目需求就是打开一个连接跳转到安卓或苹果默认的浏览器。虽然开始一个简单的要求，其中的一个细节就是执行打开网页这一操作后，不能看上去像在应用内部打开，看上去要在应用外部打开。提供了加载网页的插件；所谓的插件也是用安卓和苹果原生代码实现的，对插件的代码进行解压可以看到。
加载网页的方式：
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_launchurl() async {
const url = '要加载的网页地址';
if (await canlaunch(url)) {
await launch(url);
}
}
简单查看一下插件的源码：
future<bool> launch(
string urlstring, {
bool forcesafarivc,
bool forcewebview,
bool enablejavascript,
bool enabledomstorage,
bool universallinksonly,
map<string, string> headers,
brightness statusbarbrightness,
}) async {
assert(urlstring != null);
........................................
属性：forcesafarivc
/// [forcesafarivc] is only used in ios with ios version >= 9.0. by default (when unset), the launcher /// opens web urls in the safari view controller, anything else is opened /// using the default handler on the platform. if set to true, it opens the /// url in the safari view controller. if false, the url is opened in the /// default browser of the phone. note that to work with universal links on ios, /// this must be set to false to let the platform's system handle the url. /// set this to false if you want to use the cookies/context of the main browser /// of the app (such as sso flows). this setting will nullify [universallinksonly] /// and will always launch a web content in the built-in safari view controller regardless /// if the url is a universal link or not.
forcesafarivc 仅被用于ios版本为0.9和0.9以上的系统。默认情况下不设置，如果设置加载网页连接在safari视图控制器打开，其他操作系统打开使用默认设置。如果设置为true，在safari视图控制器打开url。如果设置为false，在手机默认浏览器中打开。注意网页连接在ios 平台操作系统上打开必须设置为false。如果你想去用cookies在app网页端实现登录需要设置为false。
如果加载在内置safari视图控制器的网页内容是universal link或不是，设置universallinksonly无效。
universal link：（点击连接打开应用）、参考
属性：forcewebview
/// [forcewebview] is an android only setting. if null or false, the url is /// always launched with the default browser on device. if set to true, the url /// is launched in a webview. unlike ios, browser context is shared across /// webviews.
该属性只在安卓平台设置。如果设置为false或不设置，网络地址被加载在设备默认浏览器。如果设置为true，网络地址被加载在自定义webview。ios系统的浏览器可以共享数据。
属性：enablejavascript
/// [enablejavascript] is an android only setting. if true, webview enable /// javascript.
该属性只在安卓平台设置。如果为true，webview可加载脚步。
属性：enabledomstorage
/// [enabledomstorage] is an android only setting. if true, webview enable /// dom storage.
该属性只在安卓平台设置。如果为true，webview加载本地网页缓存。
属性：universallinksonly
/// [universallinksonly] is only used in ios with ios version >= 10.0. this setting is only validated /// when [forcesafarivc] is set to false. the default value of this setting is false. /// by default (when unset), the launcher will either launch the url in a browser (when the /// url is not a universal link), or launch the respective native app content (when /// the url is a universal link). when set to true, the launcher will only launch /// the content if the url is a universal link and the respective app for the universal /// link is installed on the user's device; otherwise throw a [platformexception].
该属性只在ios平台使用并且ios版本为10.0或10.0以上。当前该属性设置成false生效。默认值是false。默认情况下，通过手机手机浏览器加载网页（当这个链接不是一个universal link）或 加载各自app（当这个链接是一个universal link，点击进行下载应用包）。如果设置属性值为true，如果这个连接是一个universal link并且各自的应用通过这个universal link安装在用户的设备上，那么改网页会被加载。否则抛出platformexception。
属性：statusbarbrightness
/// [statusbarbrightness] sets the status bar brightness of the application /// after opening a link on ios. does nothing if no value is passed. this does /// not handle resetting the previous status bar style.
设置的状态栏亮度在ios应用打开一个连接后可以看到。如果没有设置该属性不会有效果的。状态栏样式重复设置以第一次设置为准。
future<bool> launch(
string urlstring, {
bool forcesafarivc,
bool forcewebview,
bool enablejavascript,
bool enabledomstorage,
bool universallinksonly,
map<string, string> headers,
brightness statusbarbrightness,
}) async {
assert(urlstring != null);
final uri url = uri.parse(urlstring.trimleft());
final bool isweburl = url.scheme == 'http' || url.scheme == 'https';
if ((forcesafarivc == true || forcewebview == true) && !isweburl) {
throw platformexception(
code: 'not_a_web_scheme',
message: 'to use webview or safarivc, you need to pass'
'in a web url. this $urlstring is not a web url.');
}
bool previousautomaticsystemuiadjustment;
if (statusbarbrightness != null && defaulttargetplatform == targetplatform.ios) {
previousautomaticsystemuiadjustment =
widgetsbinding.instance.renderview.automaticsystemuiadjustment;
widgetsbinding.instance.renderview.automaticsystemuiadjustment = true;
systemchrome.setsystemuioverlaystyle(statusbarbrightness == brightness.light
? systemuioverlaystyle.dark
: systemuioverlaystyle.light);
}
final bool result = await urllauncherplatform.instance.launch(
urlstring,
usesafarivc: forcesafarivc ?? isweburl,
usewebview: forcewebview ?? false,
enablejavascript: enablejavascript ?? false,
enabledomstorage: enabledomstorage ?? false,
universallinksonly: universallinksonly ?? false,
headers: headers ?? <string, string>{},
);
if (statusbarbrightness != null) {
widgetsbinding.instance.renderview.automaticsystemuiadjustment =
previousautomaticsystemuiadjustment;
}
return result;
}
安卓或苹果平台加载：
实现让用户看到不少应用内部跳转打开网页加载，是跳转到手机默认浏览器加载。
if (platform.isios) {
launch(url, forcesafarivc: false, forcewebview: true);
return;
}
if (platform.isandroid) {
launch(url);
}
解压插件源码可以看到flutter就是调用安卓或者ios原生代码进行加载网页。
安卓中通过webview加载网页或者跳转默认浏览器加载网页：
launchstatus launch(
string url,
bundle headersbundle,
boolean usewebview,
boolean enablejavascript,
boolean enabledomstorage) {
if (activity == null) {
return launchstatus.no_activity;
}
intent launchintent;
if (usewebview) {
launchintent =
webviewactivity.createintent(
activity, url, enablejavascript, enabledomstorage, headersbundle);
} else {
launchintent =
new intent(intent.action_view)
.setdata(uri.parse(url))
.putextra(browser.extra_headers, headersbundle);
}
activity.startactivity(launchintent);
return launchstatus.ok;
}
在ios手机中默认浏览器打开
- (void)launchurlinvc:(nsstring *)urlstring result:(flutterresult)result api_available(ios(9.0)) {
nsurl *url = [nsurl urlwithstring:urlstring];
self.currentsession = [[flturllaunchsession alloc] initwithurl:url withflutterresult:result];
__weak typeof(self) weakself = self;
self.currentsession.didfinish = ^(void) {
weakself.currentsession = nil;
};
[self.topviewcontroller presentviewcontroller:self.currentsession.safari
animated:yes
completion:nil];
}
在ios中用内置浏览器打开：
- (void)launchurl:(nsstring *)urlstring
call:(fluttermethodcall *)call
result:(flutterresult)result {
nsurl *url = [nsurl urlwithstring:urlstring];
uiapplication *application = [uiapplication sharedapplication];
if (@available(ios 10.0, *)) {
nsnumber *universallinksonly = call.arguments[@"universallinksonly"] ?: @0;
nsdictionary *options = @{uiapplicationopenurloptionuniversallinksonly : universallinksonly};
[application openurl:url
options:options
completionhandler:^(bool success) {
result(@(success));
}];
} else {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-wdeprecated-declarations"
bool success = [application openurl:url];
#pragma clang diagnostic pop
result(@(success));
}
}
如果在安卓或者苹果加载http网页出现无法加载：
///安卓：在xml文件夹下创建network_security_config.xml ，然后在androidmanifest.xml 标签application引用
<?xml version="1.0" encoding="utf-8"?> <network-security-config> <base-config cleartexttrafficpermitted="true"> <trust-anchors> <certificates src="system" /> </trust-anchors> </base-config> </network-security-config> ///ios：
参考：
android webview：
safariservices：
总结
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