根据IOS marcuswestin/WebViewJavascriptBridge 编写而来的JavascriptBridge。
相比同类库的优点：
规定JS和Java之间用标准JSON格式字符串交互，JS传给Java的数据会封装成 org.json.JSONObject。
(An Android bridge for sending messages between Java and JavaScript in WebViews. Based on IOS marcuswestin/WebViewJavascriptBridge.)
repositories {
jcenter()
}
compile 'com.luffyjet:webviewjavascriptbridge:1.0'See the app/ folder.
1) Init WebViewJavaScriptBridge
WebSettings settings = webView.getSettings();
settings.setJavaScriptEnabled(true);//很关键
WebViewJavaScriptBridge mBridge = WebViewJavaScriptBridge.bridgeForWebView(this, webView);
mBridge.setWebViewDelegate(new MyWebViewClient());//设置WebViewClient
webView.setWebChromeClient(new MyChromeClient());//设置ChromeClient2) Register a handler in Java, and call a JS handler:
//注册一个 处理 js端发来消息的 handler
mBridge.registerHandler("abs", new WebViewJavaScriptBridgeBase.WVJBHandler() {
@Override
public void handle(JSONObject data, WebViewJavaScriptBridgeBase.WVJBResponseCallback responseCallback) {
Log.d(TAG, "from JS req: " + data.toString());
responseCallback.callback(new JSResult("i like milk from native").toJson());
}
});
mBridge.callHandler("NativeCallJS", model.toJSON(), new WebViewJavaScriptBridgeBase.WVJBResponseCallback() {
@Override
public void callback(String responseData) {
Log.d(TAG, "JS responded:" + responseData);
Toast.makeText(MainActivity.this, "JS responded:" + responseData , Toast.LENGTH_SHORT).show();
}
});
3) Copy and paste setupWebViewJavascriptBridge into your JS:
function setupWebViewJavascriptBridge(callback) {
if(window.WebViewJavascriptBridge) {
return callback(WebViewJavascriptBridge);
}
if(window.WVJBCallbacks) {
return window.WVJBCallbacks.push(callback);
}
window.WVJBCallbacks = [callback];
var WVJBIframe = document.createElement('iframe');
WVJBIframe.style.display = 'none';
//这里最新IOS版是 https的scheme，真实环境下 需要判断iOS和Android，做下区分。
WVJBIframe.src = 'wvjbscheme://__BRIDGE_LOADED__';
document.documentElement.appendChild(WVJBIframe);
setTimeout(function() {
document.documentElement.removeChild(WVJBIframe)
}, 0);
}5) Finally, call setupWebViewJavascriptBridge and then use the bridge to register handlers and call Java handlers:
setupWebViewJavascriptBridge(function(bridge) {
/* Initialize your app here */
bridge.registerHandler('NativeCallJS', function(data, responseCallback) {
var responseData = {
'Javascript Says': 'Right back atcha!'
};
log('Native call JS with ', data);
responseCallback(responseData);
});
var doc = document;
var readyEvent = doc.createEvent('Events');
readyEvent.initEvent('WebViewJavascriptBridgeReady');
readyEvent.bridge = WebViewJavascriptBridge;
doc.dispatchEvent(readyEvent);
});可以和Cordova一样进行模块管理，同一种类型的消息(handler name相同)都由一个模块处理。 模块类需要继承 RequestHandler ，包含WebView的Activity要实现 BridgeInterface 接口。插件类由XML文件进行配置,请在项目中新建 res/xml/wjbconfig.xml 文件。
<?xml version="1.0" encoding="utf-8"?>
<widget>
<feature name="chooseImage">
<param
name="android-package"
value="com.luffyjet.jsbridgeexample.handlers.ImageChooseHandler"/>
<param
name="onload"
value="true"/>
</feature>
<feature name="deviceInfo">
<param
name="android-package"
value="com.luffyjet.jsbridgeexample.handlers.DeviceInfoHandler"/>
<param
name="onload"
value="true"/>
</feature>
</widget>
//一个简单的选图模块示例
public class ImageChooseHandler extends RequestHandler {
private static final String TAG = "ImageChooseHandler";
private static final int REQUEST_CODE_IMAGES = 100;
private WebViewJavaScriptBridgeBase.WVJBResponseCallback mResponseCallback;
@Override
public void handle(JSONObject data, WebViewJavaScriptBridgeBase.WVJBResponseCallback responseCallback) {
mResponseCallback = responseCallback;
...
mBridgeInterface.startActivityForResult(this, Intent.createChooser(i, "选取图片"), REQUEST_CODE_IMAGES);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == Activity.RESULT_OK && requestCode == REQUEST_CODE_IMAGES) {
try {
...
mResponseCallback.callback(result.toJSON());
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
// 包含webview 的 WebActivity
public class WebActivity extends AppCompatActivity implements BridgeInterface{
RequestHandler mRequestHandler;
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (null != mRequestHandler) {
RequestHandler callback = mRequestHandler;
mRequestHandler = null;
callback.onActivityResult(requestCode, resultCode, data);
return;
}
//other code
}
@Override
public void startActivityForResult(RequestHandler command, Intent intent, int requestCode) {
setActivityResultCallback(command);
startActivityForResult(intent, requestCode);
}
@Override
public void setActivityResultCallback(RequestHandler plugin) {
mRequestHandler = plugin;
}
@Override
public Activity getActivity() {
return this;
}
@Override
public ExecutorService getThreadPool() {
return Executors.newCachedThreadPool(new ThreadFactory() {
@Override
public Thread newThread(final Runnable r) {
return new Thread(new Runnable() {
@Override
public void run() {
android.os.Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
r.run();
}
},"Test");
}
});
}
}
一个功能模块对应一个feature，feature name就是handle name。 onload属性为true代表模块(插件)会在webview初始化时一同初始化，false则是在需要该模块(插件)的时候通过反射加载。
具体使用方法请查看 app/ 目录下的示例代码。
marcuswestin/WebViewJavascriptBridge & lzyzsd/JsBridge & cordova-android
See the LICENSE file for license rights and limitations.