Question

我通过在webview中加载的java脚本调用本机android函数但是不起作用这是我用WebView做的事情

paintView = (WebView) findViewById(R.id.webView1);
WebSettings Websettings = paintView.getSettings();
Websettings.setBuiltInZoomControls(true);
Websettings.setSupportZoom(true);
Websettings.setJavaScriptEnabled(true);
Websettings.setBuiltInZoomControls(true);
Websettings.setRenderPriority(RenderPriority.HIGH);
paintView.getSettings().setPluginState(PluginState.ON);
paintView.setWebChromeClient(new WebChromeClient());
final MyJavaScriptInterface myJavaScriptInterface = new MyJavaScriptInterface(this);
paintView.loadUrl("file:///android_asset/index_jQueryMobile.html");

这是android方法

@JavascriptInterface
public void byteToImage(String base64img, String ImageName) throws IOException
{
    byte[] pdfAsBytes = Base64.decode(base64img.toString(), 0);
    File file = new File(Environment.getExternalStorageDirectory()+"/AndroPaint");
    if(!file.exists()) {
        file.mkdirs();
    }
    File filePath = new File(Environment.getExternalStorageDirectory()+"/AndroPaint/"+ImageName+".png");
    FileOutputStream os = new FileOutputStream(filePath, true);
    os.write(pdfAsBytes);
    os.flush();
    os.close();
}

这是JS函数

function getImageBytes()
{
    var canvas = document.getElementById('canvas');
    var imageName = document.getElementById('imgName');
    var imgData= canvas.toDataURL();
    activity.byteToImage(imgData,imageName);
}

这是例外

01-04 10:48:50.409: E/Web Console(15681): Uncaught ReferenceError: activity is not defined:72

Answer 1

您创建了一个连接界面MyJavaScriptInterface，但您忘记将其附加到WebView：

paintView.addJavascriptInterface(new MyJavaScriptInterface(this), "activity");

这就是您收到activity is not defined错误的原因。 activity引擎无法找到JS个对象。

Here是一个关于

的小教程

Android Web Console未捕获的ReferenceError

1 个答案: