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I just want to know when html page is loaded. OnPageFinished is called before whole page is loaded. I got blank view when I set Image View by bitmap created from WebView
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.setAlwaysDrawnWithCacheEnabled(true);
mWebView.setWebViewClient(new WebViewClient(){
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon){
super.onPageStarted(view, url, favicon);
}
@Override
public void onPageFinished(WebView view,String url){
Bitmap b = Bitmap.createBitmap( 480, 240, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b);
view.layout(view.getLeft(), view.getTop(), view.getRight(), view.getBottom());
view.draw(c);
mImageView.setImageBitmap(b);
//b.recycle();
}
});
EDIT :
I tried to implement JavaScriptInterface for now only with making Toast message, but it still doesn't work. I've pasted html code and Java :
EDIT :
I finally got it working. I used JavaScriptInterface with proper . When loadUrl is launch html file is being loaded. When whole page is available on screen, onload function from html file call captureImage function from JavaScriptInterface class. Now I have sure that page is fully loaded and I can grab picture of it. Thanks for all help.
CODE:
JAVA :
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.setDrawingCacheEnabled(true);
mWebView.addJavascriptInterface(new JavaScriptInterface(this), "Android");
mWebView.setWebViewClient(new WebViewClient(){});
mButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mWebView.loadUrl("file:///android_asset/html_sample.html");
//mWebView.loadUrl("https://www.onet.pl");
}
});
public class JavaScriptInterface {
private Context mContext;;
public JavaScriptInterface(Context context) {
mContext = context;
}
@JavascriptInterface
public void captureImage(){
Bitmap b = mWebView.getDrawingCache(true);
mImageView.setImageBitmap(b);
}
@JavascriptInterface
public void showToast(String toast) {
Toast.makeText(mContext, toast, Toast.LENGTH_SHORT).show();
}
}
HTML :
<html>
<head>
<title>My first styled page</title>
<link rel="stylesheet" href="sample_css.css">
</head>
<body onload="function(){ Android.captureImage() }">
...
</body>
</html>
657
Found simple technique to load page even after onPageFinished is called-- Recursively call loadUrl method until page is not loaded successfully.. @Override public void onPageFinished(WebView view, String url) { // progressDialog.hide();
Log.e("onPageFinished","onPageFinished");
if (view.getContentHeight() == 0){
pbar.setVisibility(View.VISIBLE);
webView.loadUrl("https://drive.google.com/viewerng/viewer?embedded=true&url="+pdf);
}
else {
pbar.setVisibility(View.GONE);
}
}
This is because onPageFinished means "the page has finished loading", not "the page is on screen". Unfortunately the WebView doesn't have a 'the page you wanted is now on screen' API. Folks usually resort to a combination of PictureListener (which was deprecated since it's unreliable) and random timeouts (which are either super long or don't work on some devices).
You could try by rendering to a small bitmap and checking if it's all white on every PictureListener callback (and remember to stop doing this when you're done waiting, otherwise you'll burn tons of CPU if the page has animations/gifs/etc..). Rendering to a small bitmap will still be very CPU-intensive if the page has big images, so this is definitely not a great solution.
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