WebViewJavascriptBridge for Android is Cross-platform WebViewJavascriptBridge for Android Extension,the JavaScript interface compatible with WebViewJavascriptBridge 。

1) Add following to the build.gradle of your project.

    dependencies {
        compile 'com.gzsll.jsbridge:library:1.1.0'
    }

2) Add com.gzsll.jsbridge.WVJBWebView to your layout, it is inherited from WebView.

       webView.registerHandler("testJavaCallback", new WVJBWebView.WVJBHandler() {

            @Override
            public void request(Object data, WVJBWebView.WVJBResponseCallback callback) {
                Toast.makeText(MainActivity.this, "testJavaCallback called:" + data, Toast.LENGTH_LONG).show();
                callback.callback("Response from testJavaCallback!");
            }
        });

        webView.callHandler("testJavascriptHandler", "{\"foo\":\"before ready\" }", new WVJBWebView.WVJBResponseCallback() {

            @Override
            public void callback(Object data) {
                Toast.makeText(MainActivity.this, "Java call testJavascriptHandler got response! :" + data, Toast.LENGTH_LONG).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';
    WVJBIframe.src = 'wvjbscheme://__BRIDGE_LOADED__';
    document.documentElement.appendChild(WVJBIframe);
    setTimeout(function() { document.documentElement.removeChild(WVJBIframe) }, 0)
}

4) Finally, call setupWebViewJavascriptBridge and then use the bridge to register handlers and call Java handlers:

 setupWebViewJavascriptBridge(function(bridge) {
        bridge.registerHandler('testJavascriptHandler', function(data, responseCallback) {
            var responseData = { 'Javascript Says':'Right back atcha!' }
            responseCallback(responseData)
        })

        var callbackButton = document.getElementById('buttons').appendChild(document.createElement('button'))
        callbackButton.innerHTML = 'Fire testJavaCallback'
        callbackButton.onclick = function(e) {
            bridge.callHandler('testJavaCallback', {'foo': 'bar'}, function(response) {
                log('JS got response', response)
            })
        }
    })

5) If you want to use WebViewClient,you must use like this

    public class CustomWebViewClient extends WVJBWebViewClient {

        public CustomWebViewClient(WVJBWebView webView) {
            super(webView);
        }

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            //  do your work here
            // ...
            return super.shouldOverrideUrlLoading(view, url);
        }
    }

6) Read Demo for more detail.

API Reference

Java API

public void registerHandler(String handlerName, WVJBHandler handler)

Register a handler called handlerName. The javascript can then call this handler with WebViewJavascriptBridge.callHandler("handlerName").

public void callHandler(String handlerName)

public void callHandler(String handlerName, Object data)

public void callHandler(String handlerName, Object data,WVJBResponseCallback callback)

Call the javascript handler called handlerName. If a WVJBResponseCallback callback is given the javascript handler can respond.

Javascript API

bridge.registerHandler("handlerName", function(responseData) { ... })

Register a handler called handlerName. The Java can then call this handler with public void callHandler(String handlerName, Object data) and public void callHandler(String handlerName, Object data,WVJBResponseCallback callback)

Example:

bridge.registerHandler("showAlert", function(data) { alert(data) })
bridge.registerHandler("getCurrentPageUrl", function(data, responseCallback) {
    responseCallback(document.location.toString())
})

bridge.callHandler("handlerName", data)

bridge.callHandler("handlerName", data, function responseCallback(responseData) { ... })

Call an Java handler called handlerName. If a responseCallback function is given the Java handler can respond.

Example:

bridge.callHandler("Log", "Foo")
bridge.callHandler("getScreenHeight", null, function(response) {
    alert('Screen height:' + response)
})