Develop Reference

WebRTC Android Share Screen the second time give black screen

I'm having trouble solving this bug and hope someone can guide me. I created the share screen function in android with WebRTC (EglBase). it works perfectly fine until the user stops sharing and then shares again, the participant's screen will be a black screen, and can't see the content.
I have already check the SurfaceViewRenderer is assigned correctly. I believe the problem may be on how I implemented the init() and release() functions.
In this function, I init the screen share video
EglBase root = EglBase.create();
screenShare.init(root.getEglBaseContext(), null);
screenShare.setZOrderMediaOverlay(true);
remoteParticipant.setView(screenShareVideoView);
In this function, I release the screen share
screenShare.clearImage();
screenShare.release();
screenShare.setVisibility(View.INVISIBLE);
Maybe I re-init the view after release() incorrectly.

Pause WebView video instead of whole WebView

I have a WebView with youtube video and 3 tabs. YouTube video is available in 1st Tab while in other 2 tabs there is a content.
Now i want to pause a video when user moves to other tabs. I have tried with
webView.onPause();
and
Class.forName("android.webkit.WebView")
.getMethod("onPause", (Class[]) null)
.invoke(webView, (Object[]) null);
but it is pausing whole WebView and my other 2 tabs are also not responding. How to stop just a video instead of whole WebView process

You can evaluate Javascript from android and stop video playing.
webView.evaluateJavascript(javascript, callBack);
or older versions.
webView.loadUrl(javascript);
check this
https://developer.android.com/reference/android/webkit/WebView.html#evaluateJavascript(java.lang.String,android.webkit.ValueCallback
What type video do you have? iframe or video tag?

On older devices (api <=21) I don't think this is actually possible, but an easy way to retrieve the given idea of a webview's inner controls are to:
Navigate to ../Android/android-sdk/tools/androiduiautomator.bat and open it up.
Make sure your device is connected via an ADB bridge (which it most likely will be)
Take a device screenshot of your screen and hover over the webkit control you want to call onPause which should bring up some information to the right hand side of your screen.
Substitute the id for
Class.ForName("yourId")
and just call a generic click event which should cause an inner effect of pausing. It could also be
Field.getDeclaredField("Id")
but I'm not positive. One of those two should procure a desired result.

You write you have A WebView and 3 tab, do you use from that WebView in All tab?
My Solution is that you use from Another WebView in other tab and if it tabs be selected some data that maybe be needed,be send to them.
In fact this don't solve your question, but i hope that can solve your problem.

I had similar issues with WebViews malfunctioning across my app. I decided to use the complementary function of onPause() (i.e. onResume()) in the same way:
Class.forName("android.webkit.WebView")
.getMethod("onResume", (Class[]) null)
.invoke(webView, (Object[]) null);

Best practice on enable/disable webview in Android

Would like to ask for some advice on what's best way to implement on enabling and disabling the web view on Android?
I have this app wherein it can open urls within (by using web views) which then popups up and covers 80% of the UI, when the user navigates to another page of the app it should hide/close the web view but can be re-opened again when needed.
Here's a snippet of the code
private WebViewInterface webViewInterface = new WebViewInterface() {
#Override
public void onOpenURL(String url) {
navBrowserWV.setVisibility(View.VISIBLE);
navBrowserWV.getSettings().setJavaScriptEnabled(true);
navBrowserWV.setWebViewClient(new WebViewClient() {
#Override
public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error){
handler.proceed();
}
});
navBrowserWV.loadUrl(url);
}
};
then this is how I close it
private void closeWebView() {
Log.d(LOGTAG, "closing webview...");
// Destroy WebView if it exists
if (this.navBrowserWV != null) {
this.navBrowserWV.stopLoading();
this.navBrowserWV.loadUrl("about:blank");
this.navBrowserWV.clearHistory();
this.navBrowserWV.clearCache(true);
this.navBrowserWV.pauseTimers();
this.navBrowserWV.setVisibility(View.GONE);
}
}
The problem with this implementation is that it displays the page properly at first but when I close it and then open the web view again with a url, it does not load the page anymore just a white background (no errors on the logger btw).
Would like to ask for help on how to resolve this one. Thanks

Finally, after a long time of digging up answers on the internet I found this old post regarding killing Android webview [link].
There's no real way to kill the WebView (it will always run in your process and you can't do anything about it ATM). So you only have to tell the WebView to load a bogus page, for me I did:
this.navBrowserWV.loadUrl("about:blank");
And it works now!
Quote from the website
4.1 .getSettings().setJavaScriptEnabled() Inhalt
Well, you would think that disabling JavaScript in the WebView’s settings would have an instant effect, in short: it does not. Only after reloading the page would there be no javascript any more, and this is not nice by design, since the page is still more or less well rendered.
4.2 .stopLoading() Inhalt
Since XHR „loads“ something from another server, you might think that calling „webview.stopLoading()“ would have an effect. In short: it does not. Works only on ressources contained within the HTML-file. Pity, is it not… Well, maybe not, since there is no „startLoading()“ method to resume XHR after resuming the activity anyway.
4.3 .destroy() Inhalt
As a last resort one might think about „destroy()“ing that thing, and true enough, the WebView itself is not accessible after that. Its threads however continue to exist as zombies somewhere in the vast RAM space and also continue to send XHR requests…
4.4 .pauseTimers() / resumeTimers() Inhalt
In short: Nope, does not work. I even don’t know what these methods are good for if not for controlling JavaScript timers. There aren’t any in plain HTML, AFAIK.
Update: When it comes to timers only, these functions seem to work on 2.3.5 and upwards, however, when there is no timer active at the time of calling the function, all in vain. With my use case: When pausing the app while there is an XHR active (instead of the running timer that schedules the next XHR call), nothing happens and the next timer continues unhindered.
I hope this will help someone who has the same problem as mine.

Images randomly break in PhoneGap/WebView on Android 4.4

I am experiencing a strange bug in PhoneGap on Android 4.4, for which I couldn't find any solution online. In my app, I am loading a lot of different images from a remote server, and as the user navigates back and forth, new images are loaded on each page (4 at a time, to be specific, through jQuery-generated html). After having navigated back and forth for a little while, some images will randomly not show up and instead show the typical "broken image" icon.
Now, here comes the strange part: I have been following the instructions at jQuery/JavaScript to replace broken images and done a few tests of my own. In conclusion, the naturalWidth and naturalHeight parameters report the right sizes of the images, and complete reports true for all images. Therefore, the solutions mentioned in the above SO thread don't work at all. Changing the image src doesn't help, either with or without a setTimeout (I tried adding the current timestamp as a parameter to the image path as well).
Did anyone else encounter this issue at all, or am I going crazy here? :)
EDIT: By the way, no error is ever reported. Therefore, no error handler is called when loading the image, making it useless to solve the problem with the already suggested methods (see the link above).

This is how i handle error images,
<img src="images/imageName.jpg" onError="onErrorFunc(this);" alt=" " />
function onErrorFunc(elem){
var imgUrl = "https://alternative-image";
elem.onerror = function (){
elem.src='images/noimage.jpg';
}
elem.src=imgUrl;
}
Hope it helps!

RepeatingSpriteBackground on MenuScene

I have started using Andengine, and after following some tutorials I'm starting to develope for myself.
Right now I have a a BaseGameActivity where I call one splashScene(working fine) and after that my MenuScene.
If i set a simple background (just color) it loads fine (all menu text are displayed), but when i try to set a repeating sprite as background, a black screen appears (no error show in logcat)
I'm using the example code for the background
super(BaseActivity.getSharedInstance().mCamera);
activity = BaseActivity.getSharedInstance();
RepeatingSpriteBackground mGrassBackground = new RepeatingSpriteBackground(mCamera.getWidth(), mCamera.getHeight(), activity.getTextureManager(), AssetBitmapTextureAtlasSource.create(activity.getAssets(), "images/menu/background.png"), activity.getVertexBufferObjectManager());
this.setBackground(mGrassBackground);
I placed this code in the MenuScene constructor.
Thanks in advance and sorry for my English

I just discover my problem.
The code was right the problem was in the image format, it has to be a power of two (it says that clearly in the source code comments)
Next time I will try to read carefully before asking