如何从 Javascript 调用原生 Iphone/Android 功能?
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How to Call Native Iphone/Android function from Javascript?
提问by user960567
I am using Web View both in Iphone and Android. In Android, I use create a variableto call native Andriod functions/methods. But I have not able to find something similar in Iphone. So, how to call a native Iphone function from JavaScript.
我在 Iphone 和 Android 中都使用 Web View。在 Android 中,我使用创建一个变量来调用原生 Andriod 函数/方法。但我无法在 Iphone 中找到类似的东西。那么,如何从 JavaScript 调用原生的 Iphone 函数。
回答by asgoth
iOS
IOS
In iOS you could use a custom url scheme by implementing shouldStartLoadWithRequest
. If I would by example want to change the toolbar's tint color:
在 iOS 中,您可以通过实现shouldStartLoadWithRequest
. 例如,如果我想更改工具栏的色调:
ViewController.h
视图控制器.h
@property (strong, nonatomic) IBOutlet UIToolbar *toolbar;
ViewController.m
视图控制器.m
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
NSURL *url = request.URL;
NSString *scheme = [url scheme];
if ([scheme isEqualToString:@"color"]) {
self.toolbar.tintColor = [self colorWithHexString:url.host];
}
return YES;
}
Javascript
Javascript
In javascript you just change window.location
, which will launch a fire and forget:
在 javascript 中,您只需更改window.location
,这将引发火灾并忘记:
window.location = 'color://' + color;
Just chain your parameters like:
只需链接您的参数,例如:
window.location = 'myscheme://param1/' + value1 + '/param2/' + value2;
Just make sure you use encodeURIComponentto encode your parameters (to create a valid url).
只需确保使用encodeURIComponent对参数进行编码(以创建有效的 url)。
Android
安卓
In Android you add a javascript interface:
在 Android 中,您添加一个 javascript 接口:
WebView webView = getWebView();
webView.loadUrl("http://localhost:8080");
// must be after loadUrl on lower apis
webView.addJavascriptInterface(new AndroidBridge(this), "AndroidBridge");
...
...
public class AndroidBridge {
private MainActivity activity;
public AndroidBridge(MainActivity activity) {
this.activity = activity;
}
@JavascriptInterface
public void changeNavbarBackground(String color) throws NoSuchFieldException, IllegalArgumentException, IllegalAccessException {
Log.i(getClass().getSimpleName(), "changeNavbarBackground " + color);
Field f = R.color.class.getField(color);
final int col = (Integer) f.get(null);
activity.changeNavbarBackground(col);
}
}
Javascript
Javascript
In javascript you use the javascript interface:
在 javascript 中,您使用 javascript 接口:
if (window.AndroidBridge) {
window.AndroidBridge.changeNavbarBackground(color);
}