“/media/image/123”代表H5要调用Native查看id为123的图片；
“/webapp/close/webview”表示H5需要Native关闭当前页面；
“/webapp/patient_card/？patient_id=345”表示H5要调用Native显示用户345的详情页

protected WebViewClient mWebClient = new WebViewClient() {
 @Override 
 public boolean shouldOverrideUrlLoading(WebView view, String url) {  
  // 添加tel链接响应
  if (url.startsWith("tel:")) { 
   Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse(url)); 
   startActivity(intent); 
   return true;
  }

  // 添加mp4播放相应
  if (url.endsWith(".mp4")) { 
   viewVideo(url); 
   return true;
  }

  // 添加图片链接响应
  if (Pattern.compile("/media/image").matcher(url).find()) { 
   viewImage(url); 
   return true;
  }
  // 关闭webview
  if (Pattern.compile("/webapp/close/webview").matcher(url).find()) {   
   onBackPressed(); 
   return true;
  }

  // 添加某个特殊url的响应
  if(Pattern.compile("/webapp/patient_card/").matcher(url).find()) { 
   Uri uri = Uri.parse(url); 
   String patientId = uri.getQueryParameter("patient_id");
   viewPatientInfo(patientId);

   return true;
  }

  return super.shouldOverrideUrlLoading(view, url);   
};

WebSettings settings = mWebView.getSettings();
settings.setJavaScriptEnabled(true);

public class WebAppInterface {
 @JavascriptInterface
 public boolean method1(String param1, String param2) {
   // do something
 }

 @JavascriptInterface
 public boolean method2(String param1, String param2) {
   // do something
 }
}

WebView webView = (WebView) findViewById(R.id.webview);
webView.addJavascriptInterface(new WebAppInterface(), "InterfaceName");

<script type="text/javascript"> 
 function method1(param1, param2) {  
  InterfaceName.method1(param1, param2); 
 }
</script>

// 无参数调用
contentWebView.loadUrl("javascript:javacalljs()");

// 有参数调用
mWebView.loadUrl("javascript:test('" + param+ "')"); // param是js的函数test()的参数