Develop Reference

Android App not connecting to internet on emulator

The app does not connect to the internet. I have
<uses-permission android:name="android.permission.INTERNET" />
in my manifest and I checked the other applications on the emulator for example youtube and google search works but the application isn't able to load the page. This is my main java file.
import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebView;
public class MainActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
WebView myWebview ;
myWebview = (WebView) this.findViewById(R.id.webz);
myWebview.loadUrl("https://en.wikipedia.org/");
}
}
and this is my main activity
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.hoda.myapplication.MainActivity">
<WebView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/webz"></WebView>
</android.support.constraint.ConstraintLayout>
this is the error i get
[ERROR:gl_surface_egl.cc(289)] eglChooseConfig failed with error EGL_SUCCESS

Try enabling javascript and override the webviewclient to avoid redirection:
WebView myWebview ;
myWebview = (WebView) this.findViewById(R.id.webz);
myWebview.getSettings().setJavaScriptEnabled(true);
myWebview.setWebViewClient(new WebViewClient());
myWebview.loadUrl("https://en.wikipedia.org/");
and update the constraints of your WebView:
<WebView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:id="#+id/webz"></WebView>

The problem was with the emulator's graphics I believe as trying #diegoveloper 's solution on the emulator still did not load the page but trying it on an actual android device was successful.

Do this
Restart the emulator (as suggested in another post and in the comments of this post)
If that doesn't work, restart your device.
Worked for me.

Add activity in your AndroidManifest.xml
android:name="com.(your browser activity)"
android:screenOrientation="portrait">

Xamarin.Android can't create Facebook login button

As I searched for the answer to my question I saw some solutions which didn't helped me.. So the problem is that in my xamarin android app I'm trying to create facebook authentication, so first move is to create facebook login button
FacebookLoginView.axml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:minWidth="25px"
android:minHeight="25px"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/relativeLayout1">
<com.facebook.login.widget.LoginButton
android:id="#+id/login_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true" />
</RelativeLayout>
It looks like this
FacebookLoginView.cs
[Activity(Label = "Facebook login")]
class FacebookLoginView : MvxActivity
{
private LoginButton loginButton;
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
RequestWindowFeature(WindowFeatures.NoTitle);
//FacebookSdk.SdkInitialize(ApplicationContext);
SetContentView(Resource.Layout.FacebookLoginView);
}
}
When I run the code I'm getting this exception:
When I uncomment FacebookSdk.SdkInitialize(ApplicationContext); and run the app I'm getting this error:
So there are no info about the second error and I don't know how can I fix this... Could someone please explain me what I'm doing wrong?
UPDATE 1
I managed to update Xamarin.Facebook.Android from 4.16.1 to the latest version 4.24.0, but the errors are the same....

play Youtube with webview carshes

I'm trying to play YouTube video in my application using WebView.
But when I click "Play" the application crashes.
This is my code:
public class Youtube extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.a_video_item);
WebView videoView = (WebView)findViewById(R.id.videoView);
TextView tvTitle = (TextView) findViewById(R.id.VideoTitle);
WebSettings videoViewSettings = videoView.getSettings();
videoViewSettings.setJavaScriptEnabled(true);
videoViewSettings.setPluginState(WebSettings.PluginState.ON);
videoView.setWebChromeClient(new WebChromeClient());
String youtubeID ="XSzE2LLFluE";
tvTitle.setText(youtubeID);
videoView.loadUrl("http://www.youtube.com/embed/" + youtubeID +"?autoplay=1&vq=small");
}
}
And this is my XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<WebView
android:id="#+id/videoView"
android:layout_width="fill_parent"
android:layout_height="200dp"
android:layout_below="#+id/VideoTitle"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"/>
<TextView
android:id="#+id/VideoTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="#string/imgdesc"
android:layout_marginRight="10dp"/>
</RelativeLayout>
I'm testing the project with Nexus 5 on Android Studio emulator.

You have to add the two lines of code:
webView.getSettings().setPluginsEnabled(true); webView.getSettings().setJavaScriptEnabled(true);
this will solve the problem. Try it and tell.

I found the issuse.
Beacuse I did the tests on Emulator without Youtube app its crashes.
On a device with Youtube app its working fine.
Now its crasheswhen i click on 'Full screen' button

Automatically Generating java code for xml layout in Eclipse

I have got an idea to get rid of some coding when we do initializion of views.
When we create an xml layout in android. At that movement same name class is created with UpperCase Letters with a dialogue with permission. And as i created views with ids. It should create Views and initialize them automatically.
for e.g
close.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="#+id/closeBtn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/close_img" />
<TextView
android:id="#+id/closeText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Testing Text" />
</LinearLayout>
And automatically generated java code should be.
public class Close extends Activity
{
TextView CloseText;
Button CloseBtn;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
CloseText = (TextView)findViewById(R.id.closeText);
CloseBtn = (Button)findViewById(R.id.closeBtn);
}
}
I can read xml and do the other stuff as I explained. But how could i add this module to eclipse and How could i create a service which work in Background all the time in eclipse.
Suggest me how to add this module(Plugin) to eclipse and i am going to use JAXB to generate Java Objects from XML document. Is there any better option.

Here in this website i find that just paste the xml and you will get your java code ready for activity class.
i had attached the link

Why does Android WebView display a black screen?

I've been banging my head against a wall this afternoon trying to get a WebView to work. Below is the code in the main class:
public class fkyougoogle extends Activity {
/** Called when the activity is first created. */
WebView webview;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
webview = (WebView) findViewById(R.id.webview);
webview.getSettings().setJavaScriptEnabled(true);
// WORKS
//webview.loadUrl("http://www.google.com");
// DOESN'T WORK
//webview.loadUrl("http://www.theregister.co.uk");
//webview.loadData("<html><body>hello</body></html>", "text/html", "utf-8");
//webview.loadDataWithBaseURL("fake://", "<html><body>hello</body></html>", "text/html", "utf-8", "http://www.theregister.co.uk/");
}
}
This is Google's "Hello, Webview" example. If I use a WebView and try to access www.google.com then it works fine. If I try to access any other site then it fails including loadData and it just displays a black screen in the emulator. In the end I would like to read from a local file.
is included under the manifest tag and the XML schema is the same as the Hello Webview example.
Am I missing something obvious here? :(

Try changing
android:layout_width="wrap_content"
android:layout_height="wrap_content"
to
android:layout_width="fill_parent"
android:layout_height="fill_parent"
in your main.xml top level LinearLayout
It should look like this:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<WebView
android:id="#+id/webview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>

Try UTF-8 instead of utf-8 for your latter two attempts. I have no problem loading http://www.theregister.co.uk using the same code -- try loading it in the built-in Browser app, and if that fails, you're perhaps encountering some sort of firewall/proxy issue.
Here are a few projects demonstrating simple uses of WebView, from one of my books.

I had similar problem of a WebView being completely blank, but it my case it was caused by a missing android.permission.INTERNET uses-permission.