Develop Reference

WebView: How to load .php file in the 8.0 WebView

i am trying load a .php file in WebView. it was working properly before API level 28 after i updated to API level 28 its not working its showing white screen. nothing is showing i tried all the options.
Here is the code
I am added the safe browsing false in the manifest file also.
I tried searching in the google nothing is helped me if any one done please help in this case to resolve.
String url="https://xxx/xxx/abc.php";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
handleSSLHandshake();
WebView mWebView = (WebView) findViewById(R.id.webView);
// PackageInfo webViewPackageInfo = null;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
// webViewPackageInfo = WebView.getCurrentWebViewPackage();
mWebView.getSettings().setSafeBrowsingEnabled(false);
// Log.d("MY_APP_TAG", "WebView version: " + webViewPackageInfo.versionName);
}
WebViewClientImpl webViewClient = new WebViewClientImpl(this);
mWebView.setWebViewClient(webViewClient);
mWebView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
mWebView.getSettings().setBuiltInZoomControls(false);
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.loadUrl(url);
if (18 < Build.VERSION.SDK_INT ){
//18 = JellyBean MR2, KITKAT=19
mWebView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
}
}
public class WebViewClientImpl extends WebViewClient {
private Activity activity = null;
public WebViewClientImpl(Activity activity) {
this.activity = activity;
}
#Override
public boolean shouldOverrideUrlLoading(WebView webView, String url) {
webView.loadUrl(url);
// Log.i(TAG,url);
return true;
}
#Override
public void onLoadResource(WebView view, String url) {
super.onLoadResource(view, url);
}
#Override
public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
super.onReceivedError(view, request, error);
}
#Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
super.onReceivedError(view, errorCode, description, failingUrl);
}
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
}
#Override
public void onPageFinished(WebView view, String url) {
}
}

I solved my problem. it was the certificates issues, i just added the following code, its working fine now
#TargetApi(Build.VERSION_CODES.N)
#Override
public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
view.loadUrl(request.getUrl().toString());
return true;
}
#Override
public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
handler.proceed();
}

fail to open link in webview

Fail to open link in webview in android. I tried it in webview but it only shows blank page. It seems that some of urls are loaded but some not how is it.
String strUrl = "https://app.mygtechguy.com/5862bd814bf7f";
webView.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
#Override
public void onPageFinished(WebView view, String url) {
progressBar.setVisibility(View.GONE);
}
#Override
public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
Toast.makeText(getActivity(), "Oh no! ", Toast.LENGTH_SHORT).show();
alertDialog.setTitle("Error");
alertDialog.setMessage("Make sure internet is working well");
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
return;
}
});
alertDialog.show();
}
});
webView.getSettings().setLoadsImagesAutomatically(true);
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().getAllowContentAccess();
webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
webView.loadUrl(strUrl);

I would suggest try to remove the url loading from shouldOverrideUrlLoading like this:
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
//view.loadUrl(url);
return false;
}
And also in the AndroidManifest.xml set Internet permission:
<uses-permission android:name="android.permission.INTERNET" />

WebView shows white screen on Samsung S4 android 4.2.2 for AT&T in onResume()

This is the code to my WebView. It works great on every device I have tested so far, even a Samsung S4. However, a certain Samsung S4, which the client insists it doesn't have a modified software, displays a white screen every time the app is resumed from background. Any ideas?
private void setupWebView() {
// hide the no connection imageview
// show the webview
noConnectionImageView.setVisibility(View.GONE);
webView.setVisibility(View.VISIBLE);
WebSettings settings = webView.getSettings();
settings.setJavaScriptEnabled(true);
webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
webView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
webView.setWebViewClient(new WebViewClient() {
#Override
public void onReceivedSslError(WebView view,
SslErrorHandler handler, SslError error) {
handler.proceed();
}
#Override
public void onReceivedError(WebView view, int errorCode,
String description, String failingUrl) {
showNoConnectionImage();
}
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
// page has started loading
if (mustShowSplashScreen) {
showSplashScreen();
}
}
#Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
// page has finished loading
if (mustShowSplashScreen) {
hideSplashScreen();
mustShowSplashScreen = false;
}
}
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// check for Internet connection
if (ConnectionDetector.isConnected(Main.this)) {
// check if link is external
if (isExternalUrl(url) {
// external link
new OpenLink(Main.this, url);
} else {
// internal link
view.loadUrl(url);
}
} else {
showNoConnectionImage();
Main.this.url = url;
}
return true;
}
});
}

Android WebView not render of web page

I have some web page which open in WebView.
<body onload="window.location.href='htcmd:loaded';">
After load we open back url "htcmd:loaded" and intercept in code.
Like this:
getWebView().getSettings().setJavaScriptEnabled(true);
getWebView().setWebViewClient(new WebViewClient() {
#Override
public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
handler.proceed();
}
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if ("htcmd:loaded".equals(url)) {
Toast.makeText(getActivity(), "htcmd:loaded", Toast.LENGTH_SHORT).show();
}
return true;
}
});
getWebView().loadUrl("https://some.url");
On android 4.4.2 in first start all is well. But if I kill app and open after first run, web page not render. But if I tap on screen or change orientation web page appears. Where is problem?
SOLUTION: I have two hacks)))
First: add a java script to web page:
<body onload="setTimeout(function(){window.location.href='htcmd:loaded';},3000);">
Second: add code to web client:
#Override
public void onPageFinished(WebView view, String url) {
if (android.os.Build.VERSION.SDK_INT >= 19) {
view.requestFocus();
}
}

try this
w.getSettings().setLoadWithOverviewMode(true);
w.getSettings().setUseWideViewPort(true);
getWebView().getSettings().setJavaScriptEnabled(true);
getWebView().setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
return (false);
});
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
Toast.makeText(activity, "Oh no! " + description, Toast.LENGTH_SHORT).show();
}
getWebView().loadUrl("https://www.google.com");

How to check if webview failed to load page (android)?

I have a webview in my app, however sometimes due to connectivity the webview fails to load and I get the default webpage unavailable page. I want to show an alertdialog if the webview failed to load. Is there anyway I can check (maybe in the shouldOverridePageLoad function) that a webview loaded successfully? Thanks again

Use a WebClient on your web view as follow :
webView.setWebViewClient(new WebViewClient(){
#Override public void onReceivedError(WebView view, WebResourceRequest request,
WebResourceError error) {
super.onReceivedError(view, request, error);
// Do something
}
});

Extending on Damien's answer on using WebViewClient, there are four listeners available on WebViewClient to check for the success and failure of loading web pages.
webView.setWebViewClient(new WebViewClient() {
#Override
public void onPageFinished(WebView view, String url) {
}
#Override
public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
}
#Override
public void onReceivedHttpError(
WebView view, WebResourceRequest request, WebResourceResponse errorResponse) {
}
#Override
public void onReceivedSslError(WebView view, SslErrorHandler handler,
SslError error) {
}
});
There is also:
#Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
}
});
which is deprecated in favor of its overload mentioned in the above code.