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POAndroid addJavascriptInterace, calling native function gives me a typeError
 

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  1. POAndroid addJavascriptInterace, calling native function gives me a typeError
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    <p>Ok guys. What I'm trying to do: I've got some backend code written in javascript (the project was originally supposed to be a web-app) and I've added a javascript interface to my android web view, and when I press a button in my ui, the javascript code does some stuff, then calls a function in my javascript interface when it is done... The code from my javascript interface:</p> <pre><code>public void onReady() { backend.loadUrl("javascript:dokus.backend.onLoginStatusChange(Bridge.onLoginStatusChange);"); backend.loadUrl("javascript:dokus.backend.onProjectsChange(Bridge.onProjectsChange);"); backend.loadUrl("javascript:dokus.backend.onLatestEntriesChange(Bridge.onLatestEntriesChange);"); } public void onLoginStatusChange (boolean loggedIn, String error) { Toast.makeText(mainActivity, "LoginStatusChange", Toast.LENGTH_SHORT).show(); } ... </code></pre> <p>I've already verified that the onReady function is called, so that's not the problem. The javascript function which calls onLoginStatusChange is this following:</p> <pre><code>function _login_callback(loggedIn, msg) { if (loggedIn) { _get_projects(); _get_latest_entries(); } console.log(_login_status_changed_callback); if (_login_status_changed_callback !== undefined) _login_status_changed_callback (loggedIn, msg); } </code></pre> <p>The error i get is this: "Line: 180, type error". That's all i get from my WebChromeView function, that prints everything from console.log() to a toast message.</p> <p>the console.log(_login_status_changed_callback) prints out the following:</p> <pre><code>function onLoginStatusChange () { [native code] } </code></pre> <p>I've verified that the correct arguments are called to the function (a bool and a string), so that shouldn't be the error either... I'm at a loss, what do i do?</p> <p>setup code for the web view:</p> <pre><code>private void setupBackend () { final DokusActivity that = this; backend = new WebView(this); BackendBridge.getInstance().initInstance(this, backend); backend.getSettings().setJavaScriptEnabled(true); backend.getSettings().setDomStorageEnabled(true); backend.addJavascriptInterface(BackendBridge.getInstance(), "Bridge"); backend.setWebViewClient(new WebViewClient() { public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) { Toast.makeText(that, "Oh no! " + description, Toast.LENGTH_SHORT).show(); } }); backend.setWebChromeClient(new WebChromeClient() { public boolean onConsoleMessage (ConsoleMessage consoleMessage) { Toast.makeText(that, "Oh no! " + consoleMessage.lineNumber() + ": " + consoleMessage.message(), Toast.LENGTH_SHORT).show(); return false; } }); backend.loadUrl("file:///android_asset/index.html"); } </code></pre>
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    1. PO
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    1. PTQuestion
    1. USRobin Heggelund Hansen
    1. USRobin Heggelund Hansen
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    1. COTo see if I'm following, yo add the Bridge javascript interface to the webview, then make a few javascript calls to tell the javascript to redirect calls to the Bridge. Then you log in, which causes you _login_callback method to be executed and, consequently, your _login_status_chagned_callback to be called. That a summary?
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      1. POAndroid addJavascriptInterace, calling native function gives me a typeError
      1. USNick Campion
    2. COYou are following nicely, thats entirely correct.
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      1. POAndroid addJavascriptInterace, calling native function gives me a typeError
      1. USRobin Heggelund Hansen
    3. COTo debug further, could you try not passing any params back to the callback? Also make sure the callback is not returning a value (which could be another source of this issue.)
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      1. POAndroid addJavascriptInterace, calling native function gives me a typeError
      1. USNick Campion
 

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