Develop Reference

Webview sometimes shows webpage not available

On all of my apps I am getting a "webpage not available" error. This has just been happening recently, even on apps that have not been updated in awhile. At first I thought it was my server or domain name. However, everything loads on a mobile browser or desktop browser. The strangest part is that I can click on the link for the website given by the error and it works. Also, this isn't every time I get into the app. It sometimes load without any problems at all.
This is my main activity:
public class MainActivity extends Activity {
private WebView mWebView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Allow third party cookies for Android Lollipop
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
mWebView = (WebView) findViewById(R.id.activity_main_webview);
CookieManager cookieManager = CookieManager.getInstance();
cookieManager.setAcceptThirdPartyCookies(mWebView,true);
}
mWebView = (WebView) findViewById(R.id.activity_main_webview);
mWebView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
mWebView.getSettings().setAppCacheEnabled(true);
mWebView.getSettings().setDatabaseEnabled(true);
mWebView.getSettings().setDomStorageEnabled(true);
mWebView.loadUrl("http://www.google.com");
}
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && this.mWebView.canGoBack()) {
this.mWebView.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
}

You instantiated WebView twice that could be the reason.
cookieManager.setAcceptThirdPartyCookies(mWebView,true);
You don't need this one below, you've done it already.
mWebView = (WebView)findViewById(R.id.activity_main_webview);

Android Webview doesn't show contents clearly

In recents, i had a problem with android webview i wanted to play youtube embed video center of the screen but webview had showed me black blank area in right side of video. Now i need to open documents by using Google docs but i have same problem in documents like:
Here is my webview codes:
WebView mWebView = (WebView)findViewById(R.id.webView1);
if (Build.VERSION.SDK_INT < 8) {
mWebView.getSettings().setPluginsEnabled(true);
} else {
mWebView.getSettings().setPluginState(PluginState.ON);
}
mWebView.getSettings().setUseWideViewPort(true);
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.getSettings().setLayoutAlgorithm(LayoutAlgorithm.NORMAL);
mWebView.setHorizontalScrollBarEnabled(false);
mWebView.setVerticalScrollBarEnabled(false);
mWebView.getSettings().setDefaultZoom(ZoomDensity.CLOSE);
mWebView.setInitialScale(-20);
mWebView.setWebChromeClient(new WebChromeClient());
mWebView.setWebViewClient(new WebViewClient() {
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return false;
}
});
//mWebView.loadUrl(" http://docs.google.com/viewer?url=http%3A%2F%2Fresearch.google.com%2Farchive%2Fbigtable-osdi06.pdf");
String pdf = "http://www.projectcounter.org/SSPJune_2007.ppt";
mWebView.loadUrl("http://docs.google.com/gview?embedded=true&url=" + pdf);

Android - when exiting a WebView, the audio still keeps playing

I have this code which works and the only problem with it is that if I leave the WebView and even close the app, and even press power on the phone, the audio from the podcasts keeps playing.
Would anyone know how to stop that?
Here is the code:
public class PodcastsActivity extends BaseActivity //implements ActionBar.OnNavigationListener
{
WebView webview = null;
#Override
public void onCreate(Bundle savedInstanceState)
{
//setTheme(R.style.Theme_Sherlock_Light);
super.onCreate(savedInstanceState);
//setContentView(R.layout.podcasts);
webview = new WebView(this);
webview.getSettings().setAppCacheEnabled(false);
webview.getSettings().setJavaScriptEnabled(true);
webview.setInitialScale(1);
webview.getSettings().setPluginState(PluginState.ON);
webview.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
});
//webSettings.setBuiltInZoomControls(true);
WebSettings webSettings = webview.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setBuiltInZoomControls(true);
//webSettings.getMediaPlaybackRequiresUserGesture();
webSettings.setAllowContentAccess(true);
webSettings.setEnableSmoothTransition(true);
webSettings.setLoadsImagesAutomatically(true);
webSettings.setLoadWithOverviewMode(true);
webSettings.setSupportZoom(true);
webSettings.setUseWideViewPort(true);
setContentView(webview);
webview.loadUrl("http://www.stitcher.com/podcast/entrepreneuronfirecom/entrepreneur-on-fire-tim-ferriss-other-incredible-entrepreneurs");
}
// public void onBackPressed ( )
// {
// Class.forName("com.***.HTML5WebView").getMethod("onPause", (Class[]) null).
// invoke(html5WebView, (Object[]) null);
// }
#Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
if ((keyCode == KeyEvent.KEYCODE_BACK) && webview.canGoBack())
{
webview.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
#Override
public void onStop()
{
super.onStop();
// your code
webview.clearView();
}

You should call through to the WebView's onPause() and onResume() from your Activity's onPause() and onResume(), respectively.
Pauses any extra processing associated with this WebView and its
associated DOM, plugins, JavaScript etc. For example, if this WebView
is taken offscreen, this could be called to reduce unnecessary CPU or
network traffic. When this WebView is again "active", call onResume().
There's also pauseTimers(), which affects all of the WebViews within your application:
Pauses all layout, parsing, and JavaScript timers for all WebViews.
This is a global requests, not restricted to just this WebView. This
can be useful if the application has been paused.

Accepted answer didnt work for me - just using onPause in a fragment was not enough to stop music on Android 9. I had to also do:
override fun onDestroyView() {
webview?.destroy()
super.onDestroyView()
}

Same issue for the Jetpack Compose can be solved by capturing the WebView (https://google.github.io/accompanist/webview/) in "onCreated" and then use it to call "destroy()"
val webViewState = rememberWebViewState(webViewUrl.value)
val webView = remember { mutableStateOf<android.webkit.WebView?>(null) }
//..inside Composable..
WebView(state = webViewState,
captureBackPresses = true,
onCreated = { wv ->
webView.value = wv
}
)
//..on Back Press/Close Button..
webView.value?.destroy()

In my case WebView onPause() and onResume() is not working for me.
Solution:
onPause I load the below URL to stop the audio:
webView.loadUrl("javascript:document.location=document.location");

Get the WebView navigation event

I am working in an android application that can post tweets to twitter and I am doing it with the Web View widget. If the user is not logged in it will go to the login screen and if it a logged-in user in it will go to the tweet page. My requirement is after twetting from my application it should return to my application. How can I handle this situation by WebView. How will I get the redirect url from my WebView.
Please help me.
Please look into my code:
public class TestTwittershareActivity extends Activity {
WebView webview;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
webview = (WebView) findViewById(R.id.webview);
webview.getSettings().setJavaScriptEnabled(true);
webview.loadUrl("http://www.twitter.com?status=");
webview.setWebViewClient(new HelloWebViewClient());
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && webview.canGoBack()) {
webview.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
private class HelloWebViewClient extends WebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
}

If I understand your problem correctly, you need a way to check whether the user is done with sending his tweets. Your best bet is to check the url that is being loaded in your webview. Hopefully, this url has some kind of indication that the tweet is done (maybe something in the status part?). To check the url you can use the HelloWebViewClient class you've already created and override it's onPageFinished method. e.g. something like this:
#Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
if (url.contains("status=DONE")) {
// start your activity here
}
}
If you cannot detect based on the url that the user is finished, then things are much more complicated. In that case you can try to add a javascript that allows you to extract the html of the loaded page and you'll have to parse the html to look for clues if the user is done or not.

Youtube video cant start playing in webView Android

I need to display in webView in custom dialog.
Anyway, I can load youtube site, and navigate trought videos, but when I want to play some video and when I click play nothing happens. Video just get orange flash like it is selected, but doesnt start loading and playing. Whats the problem?
I found tutorial on net, and trying to modify it. Here is the code:
dialog = new Dialog(this);
dialog.setContentView(R.layout.dialog);
pd = (ProgressBar) dialog.findViewById(R.id.web_view_progress_bar);
webview = (WebView) dialog.findViewById(R.id.web_view);
webview.getSettings().setPluginState(PluginState.ON);
webview.getSettings().setJavaScriptEnabled(true);
webview.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress) {
if (progress < 100 && pd.getVisibility() == ProgressBar.GONE) {
pd.setVisibility(ProgressBar.VISIBLE);
}
pd.setProgress(progress);
if (progress == 100) {
pd.setVisibility(ProgressBar.GONE);
}
}
});
webview.setWebViewClient(new YoutubeWebViewClient());
//shouldOverrideUrlLoading(webview, this.getUrl());
webview.loadUrl(this.getUrl());
dialog.show();
}
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && webview.canGoBack()) {
webview.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
private class YoutubeWebViewClient extends WebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
Help?
UPDATE:
I've tried this to do in other way, but again problems...
Im trying to embed youtube html5 player in webView. I only get back field without a youtube video. In right corner of webView is the youtube sign, and thats all of it. Dont have android phone, testing app on android x86 platform. is that a problem?
help :) dont care about a way of implementation, i just need this to work ^^

i dont know why but webviewclient class causes the problem , we can run it in default browser remove the webviewclient class and simly load the url of youtube you will be able to run it on 2.2 for 2.1 just use intent and through parse method open it through youtube application
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(String.format("http://www.youtube.com/v/%s")))); }

this is a kind of bug in android webview as far as i found till now,for me what worked is simply added Hardware Accleration permission in manifest.after that video embedded in my webview started playing .