1.通过WebView的loadUrl()

2.通过WebView的evaluateJavascript()

public static void runJsFunc(WebView webView,String funcName,@Nullable ValueCallback callback, Object... params){

if(TextUtils.isEmpty(funcName)){

return;

}

if(webView == null){

return;

}

StringBuilder builder = new StringBuilder(funcName);

builder.append("(");

if(params != null && params.length >0){

int len = params.length;

for (int i = 0; i

Object param = params[i];

String str = "";

if(param != null){

if(param instanceof String){

str = "\""+param.toString()+"\"";

}else {

str = param.toString();

}

}

builder.append(str);

if(i != len-1){

builder.append(",");

}

}

}

builder.append(")");

String jsFunc = builder.toString();

XLogUtil.d("jsFunc:"+jsFunc);

webView.post(() -> {

if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT){

//4.4版本以上，调用带返回值js方法

webView.evaluateJavascript(jsFunc, new ValueCallback() {

@Override

public void onReceiveValue(String value) {

XLogUtil.d("jsFunc :"+jsFunc +",onReceiveValue:"+value);

if(callback != null){

callback.onReceiveValue(value);

}

}

});

}else {

webView.loadUrl("javascript:" + jsFunc);

}

});

}

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JS调用 Android 代码的方法有3种：一般用第一种

1.通过WebView的addJavascriptInterface()进行对象映射

2.通过 WebViewClient 的shouldOverrideUrlLoading ()方法回调拦截 url

3.通过 WebChromeClient 的onJsAlert()、onJsConfirm()、onJsPrompt()方法回调拦截JS对话框alert()、confirm()、prompt() 消息

注意: js调用android时的安全性(addJavascriptInterface):

public static void keepsafe(WebView webView,boolean debugable){

if (Build.VERSION.SDK_INT > 10 &&Build.VERSION.SDK_INT < 17) {

webView.removeJavascriptInterface("searchBoxJavaBridge_");

}

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {

WebView.setWebContentsDebuggingEnabled(debugable);

}

}

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