A simpler, extendable bidirectional communication Frame between Android WebView and Javascript
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README.md

English | 简体中文

JsBridge

A simpler, extendable bidirectional communication Frame between Android WebView and Javascript

Features

  • supports parsing and callback for JS primitive types
  • Modular management
  • support System WebView and Custom WebView
  • permission authentication is implemented by Native, JS do not need to depend other file
  • support Android API 8+, avoid addJavascriptInterface Vulnerability
  • compatible with iOS WebViewJavascriptBridge

Getting Started

Download the latest JAR or Gradle:

compile 'com.apkfuns.jsbridge:jsbridge:2.1.1'

The library dependen on support-annotations, if your project already exists, please exclude

compile('com.apkfuns.jsbridge:jsbridge:2.1.1') {
    exclude module: 'support-annotations'
}

Examples

We use JS to call the original module to achieve ajax cross-domain request to briefly introduce the use of the library

1.Create Module

Create a module that needs to inherit JsModule and implement thegetModuleNamemethod, the module naming request is the same as the java variable naming, must not be empty, only allow underline(_) LettersNumber, if is static Module (not contain module name),need to inherit JsStaticModule, the following creates a Native module

public class NativeModule extends JsModule {
    @Override
    public String getModuleName() {
        return "native";
    }
}

2.Create Native Method

Module inside the creation method requires the use of annotations @ JSBridgeMethod, by default Java method name is JS call method name, also specify the name of the calling method by @JSBridgeMethod (methodName = "xx")。Method can not be static or abstract, method can contain the return type, if the return type is the object, default return string to JS, the method parameters for the following types, you can directly map to their corresponding JS type

Java Types Mapping the JS type
Boolean / boolean Bool
Integer/ int Number
Float / float Number
Double / double Number
Long / long Number
String String
JBCallback function
JBMap Object
JBArray Array

for more convenient to call, we define the method parameters as ajax, we look at the ajax request structure

$.ajax({
    type:'GET',
    url:'xxx.com',
    dataType:'text'
    data:{a:1, b:'xx'},
    success:function(data){
    },
    error:function(err){
    }
})

Ajax method parameter is a JS object, the object contains type, url, dataType three string parameters, data parameter is an object, success and error is JS callback method, let's define the Java method.

@JSBridgeMethod
public void ajax(JBMap dataMap) {
        String type = dataMap.getString("type");
        String url = dataMap.getString("url");
        JBMap data = dataMap.getJBMap("data");
        JBCallback successCallback = dataMap.getCallback("success");
        JBCallback errorCallback = dataMap.getCallback("error");
        // Omit the request code
        if (request success) {
              successCallback.apply("success");
        } else {
              errorCallback.apply("failure");
        }
}

must add annotations @JSBridgeMethod,the parameter is JBMap

JBCallback.apply callback JS callback method,variable parameter,support for Java basic types,Array (WritableJBArray),and Object(WritableJBMap), if for other objects, the default converted to string

3.Register Module

There are two ways to register a Module, Default registration, Dynamic registration

JsBridgeConfig.getSetting().registerDefaultModule(NativeModule.class);

// or

JsBridge.loadModule(NativeModule.class)

JsBridgeConfig parameter:

Method Type Description Default
setProtocol string The name of the object that JS calls JsBridge
setLoadReadyMethod string Load the completion of the callback function onJsBridgeReady
registerDefaultModule JsModule Common module, default load None
debugMode bool In debug mode, the output TAG is the JsBridgeDebug log false

4.WebView inject method & listen callback

public class WebViewActivity extends BaseActivity {
   private JsBridge jsBridge;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
         ...
       jsBridge = JsBridge.loadModule();
       ...
       webView.setWebChromeClient(new WebChromeClient() {
           @Override
           public boolean onJsPrompt(WebView view, String url, String message, String defaultValue, JsPromptResult result) {
               // listen callback
               jsBridge.callJsPrompt(message, result);
               return true;
           }
       });

       webView.setWebViewClient(new WebViewClient() {
           @Override
           public void onPageFinished(WebView view, String url) {
               super.onPageFinished(view, url);
               // inject JS
               jsBridge.injectJs(view);
           }
       });
   }

   @Override
   protected void onDestroy() {
       // Avoid memory leaks
       jsBridge.release();
       super.onDestroy();
   }
}

Now, in JS code can call this method:

JsBridge.native.ajax({
    type:'GET',
    url:'xxx.com',
    dataType:'text'
    data:{a:1, b:'xx'},
    success:function(data){
    },
    error:function(err){
    }
})

If it is like calling JsBridge.ajax({...}), change the parent class from JsModule to JsStaticModule

There are some important information, because JS execution is asynchronous, in order to ensure that injection JS has been completed, please implement the method in the callback, or judge JsBridge object exists

window.onJsBridgeReady = function () {
    JsBridge.native.ajax({...});
}

// or
document.addEventListener('onJsBridgeReady', function(){
    JsBridge.native.ajax({...});
})

// or
if (JsBridge) {
    JsBridge.native.ajax({...});
}

For documentation and additional information see wiki and sample

Proguard

-keep class com.apkfuns.jsbridge.**{*;}
-keep class * extends com.apkfuns.jsbridge.module.JsModule{*;}

License

Copyright pengwei1024

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.