有时我们开发中需要将js 注入到我们本地，有可能你会说，放在Web不就可以了吗，的确，但是需求就是这样的
通过流的形式注入
@SuppressLint("ObsoleteSdkInt")
public void onJsLocal() {
StringBuilder builder = new StringBuilder(getJS(this, "qqq.js"));
if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.KITKAT) {
agentWeb.getWebCreator().getWebView() .loadUrl("javascript:" + builder.toString());
} else {
agentWeb.getWebCreator().getWebView().evaluateJavascript(builder.toString(), new ValueCallback<String>() {
@Override
public void onReceiveValue(String value) {
Log.i("onReceiveValue", value);
}
});
}
}第二种 通过文件加载
view.loadUrl("javascript:(function() { "
+ " " //turns to red the background color
+ " var script=document.createElement('script'); "
+ " script.setAttribute('type','text/javascript'); "
+ " script.setAttribute('src', 'http://192.168.12.2/assets/mathjax/jsBridge.js'); "
+ " script.onload = function(){ "
+ " console.log('aaaaaaaa' ) ; "
+ " }; "
+ " document.getElementsByTagName('head')[0].appendChild(script); "
+ "})()");第三种，第二种有可能存在加载不成功的情况，我们可以拦截
Map<String, String> map = new HashMap<>();
map.put("Access-Control-Allow-Origin", "*");
map.put("Access-Control-Allow-Headers", "Content-Type");
WebResourceResponse resourceResponse = new WebResourceResponse("application/javascript",
"UTF-8", 200, "OK", map,
getApplication().getAssets().open(JS_FILENAME));注意由于注入是一个异步的操作，所以和js交互的过程有可能存在不顺畅的问题
可以采用
view.postDelay ...