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Simple implementation of AndroidPromise(Run android async work from javascript using ES6 Promise/async/await)
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| var AndroidPromise = { | |
| callbacks: {}, | |
| requestId: 0, | |
| request: function (work, params={}) { | |
| return new Promise((resolve, reject) => { | |
| let requestId = this.requestId++ | |
| this.callbacks[requestId] = { | |
| 'resolve': resolve, | |
| 'reject': reject | |
| } | |
| AndroidAsyncRequest.request(work, JSON.stringify(params), | |
| 'AndroidPromise.onResolve('+requestId+')', | |
| 'AndroidPromise.onReject('+requestId+')' | |
| ) | |
| }) | |
| }, | |
| onResolve: function (requestId) { | |
| let callback = this.callbacks[requestId].resolve | |
| delete this.callbacks[requestId] | |
| return callback | |
| }, | |
| onReject: function (requestId) { | |
| let callback = this.callbacks[requestId].reject | |
| delete this.callbacks[requestId] | |
| return callback | |
| } | |
| } |
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| fun interface AsyncRequest { | |
| fun request(workId: String, params: String, successCallback: Callback, failCallback: Callback) | |
| fun interface Callback { | |
| fun onResult(result: String) | |
| } | |
| } |
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| class AsyncRequestJavascriptInterface(private val delegate: Delegate) { | |
| @JavascriptInterface | |
| fun request(workId: String, params: String, successJsCallback: String, failJsCallback: String) { | |
| return delegate.request(workId, params, successJsCallback, failJsCallback) | |
| } | |
| companion object { | |
| const val JAVASCRIPT_INTERFACE_NAME = "AndroidAsyncRequest" | |
| } | |
| fun interface Delegate { | |
| fun request(workId: String, params: String, successJsCallback: String, failJsCallback: String) | |
| } | |
| } |
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| @SuppressLint("SetJavaScriptEnabled") | |
| class AsyncWebView @JvmOverloads constructor( | |
| context: Context, | |
| attrs: AttributeSet? = null, | |
| ): WebView(context, attrs) { | |
| init { | |
| settings.javaScriptEnabled = true | |
| } | |
| fun setWorkRequestProvider(asyncRequest: AsyncRequest) { | |
| addJavascriptInterface(createAsyncRequestJavascriptInterface(asyncRequest), | |
| AsyncRequestJavascriptInterface.JAVASCRIPT_INTERFACE_NAME) | |
| } | |
| private fun createAsyncRequestJavascriptInterface(asyncRequest: AsyncRequest) = | |
| AsyncRequestJavascriptInterface { workId, params, successJsCallback, failJsCallback -> | |
| val successCallback = AsyncRequest.Callback { | |
| evaluateJavascript("$successJsCallback('$it')", null) | |
| } | |
| val failCallback = AsyncRequest.Callback { | |
| evaluateJavascript("$failJsCallback('$it')", null) | |
| } | |
| post { | |
| asyncRequest.request(workId, params, successCallback, failCallback) | |
| } | |
| } | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script src="file:///android_asset/AndroidPromise.js"></script> | |
| </head> | |
| <body> | |
| <script> | |
| function printStatus(s) { | |
| let d = new Date() | |
| let line = "<br>" + d.getHours()+":"+d.getMinutes()+":"+d.getSeconds() + " " + s | |
| document.getElementById('status').innerHTML += line | |
| } | |
| async function test1(work, params) { | |
| printStatus(work + " start ("+params+")") | |
| let response = await AndroidPromise.request(work, params) | |
| printStatus(work + " end ("+response+")") | |
| } | |
| </script> | |
| <div onclick="test1('work1', 3000).then(function(){console.log('after test1')})"> | |
| <p>work1</p> | |
| </div> | |
| <div onclick="test1('work2', 5000)"> | |
| <p>work2</p> | |
| </div> | |
| <div id="status"> | |
| <hr> | |
| </div> | |
| </body> | |
| </html> |
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Hello :-)
I also had some trouble to implement a javascript interface with the android SDK. Based on the idea in the gist you referenced in your comment I created a SimpleAndroidBridge which allows you to build an easy interface between android(kotlin) and webview(java) with a full promise support.
Just check it out and let me now what you think about it :-)