CODEWITHSUNDEEP
javaandroidwebview
Jackson Vandy
Jackson Vandy

Reputation: 15

WebView is not working

In my simple android application I have a webview filling up half of the screen. All I want it to do currently is load a webpage. The problem is whenever I run my application it says webpage not available. Then if I click on the link (https://www.google.com/), where it says the webpage at https://www.google.com/ might be temporarily down or it may have moved permanently to a new address it will open the browser and go strait to the website without any problems. Here are some pieces of code:

MainActivity.java:

package com.example.tscschools;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.Window;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends Activity {

    private WebView webView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        webView = (WebView) findViewById(R.id.webView);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.setWebChromeClient(new WebChromeClient());
        webView.loadUrl("https://www.google.com/");

    }

}

activity_main.xml:

   <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <WebView 
        android:id="@+id/webView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="210dp" />

</RelativeLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.android.jackson"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />
    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.android.jackson.MainActivity"
            android:label="@string/app_name" 
            android:hardwareAccelerated="true" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

I heard somewhere when running android 4.0+ or 4.4(Im running 4.4.2), it may cause some problems with the webview? I'm not sure if thats what is causing the problem or not, but I thought I might throw it out there. I really hope whoever reads this can fix it! Thanks!

Upvotes: 1

Views: 1754

Answers (5)

vss
vss

Reputation: 1153

You should implement a WebViewClient and setContentView for your browser like this web.setWebViewClient(new myWebClient()); web.setWebChromeClient(new WebChromeClient()); setContentView(web);

package com.example.yourappname;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.webkit.ValueCallback;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.webkit.WebChromeClient;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {

WebView web;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    web = (WebView) findViewById(R.id.webView1);
    web = new WebView(this);  
    web.getSettings().setJavaScriptEnabled(true);
    web.loadUrl("http://www.yoururlhere.com");
    web.setWebViewClient(new myWebClient());
    web.setWebChromeClient(new WebChromeClient());
    setContentView(web);
}



public class myWebClient extends WebViewClient
{
    @Override
    public void onPageStarted(WebView view, String url, Bitmap favicon) {
        // TODO Auto-generated method stub
        super.onPageStarted(view, url, favicon);
    }

    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        // TODO Auto-generated method stub

        view.loadUrl(url);
        return true;

    }
    
    @Override
    public void onPageFinished(WebView view, String url) {
        // TODO Auto-generated method stub
        super.onPageFinished(view, url);

        
    }
}

//flip screen not loading again
@Override
public void onConfigurationChanged(Configuration newConfig){        
  super.onConfigurationChanged(newConfig);
}





@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if(event.getAction() == KeyEvent.ACTION_DOWN){
        switch(keyCode)
        {
        case KeyEvent.KEYCODE_BACK:
            if(web.canGoBack()){
             	web.goBack();
             }
            else
            {
            	backButtonHandler();
            }
            return true;
        }

     }
     return super.onKeyDown(keyCode, event);
 }
public void backButtonHandler() {
		AlertDialog.Builder alertDialog = new AlertDialog.Builder(
				MainActivity.this);
		
	
		// Setting Dialog Title
	   // Setting Dialog Message
		
		alertDialog.setTitle("Alert Dialog Title Here");
		alertDialog.setIcon(R.drawable.dialog_icon);
		alertDialog.setMessage("Exit Now?");
		
	     // Setting Icon to Dialog
		// Setting Positive "Yes" Button
		
		alertDialog.setPositiveButton("Exit",
				new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog, int which) {
						finish();
					}
		});
		
	// Setting Negative "NO" Button
		
		alertDialog.setNegativeButton("No",
				new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog, int which) {
						// Write your code here to invoke NO event
						dialog.cancel();
					}
				});
	// Showing Alert Message
		alertDialog.show();
}

}

Upvotes: 0

vss
vss

Reputation: 1153

You should implement a "WebViewClient" and "setContentView" inside your onCreate(Bundle savedInstanceState) above or below "webView.loadUrl", like this:

web.setWebViewClient(new myWebClient());
web.setWebChromeClient(new WebChromeClient());
setContentView(web);

and you are done. All the best..

Upvotes: 0

M D
M D

Reputation: 47807

You need to implement WebViewClient like:

 webView.loadUrl("https://www.google.com/"); 
 webView.setWebViewClient(new WebViewClient() {

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);  
            return true;
        }

        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            // TODO Auto-generated method stub
            super.onPageStarted(view, url, favicon);

        }

        @Override
        public void onPageFinished(WebView view, String url) {
            // TODO Auto-generated method stub
            super.onPageFinished(view, url);
        }

    });

In your case you have to implement WebChromeClient and WebChromeClient is used to handle a JavaScript events in Android App which are produced by WebView. The examples of such events are : 

onCloseWindow
onProgressChanged
onJsAlert
onJsConfirm
onJsPrompt
onJsTimeout

Upvotes: 1

AnswerBot
AnswerBot

Reputation: 447

From your code I can see you have not defined WebViewClient for your webview. You have just added WebChromeClient.

Add this line in your oncreate()

webView.setWebViewClient(new WebViewClient());

Upvotes: 0

scottt
scottt

Reputation: 8371

Try changing your webView.setWebChromeClient(new WebChromeClient()); line with the following to make sure that you aren't getting an SSL error:

webView.setWebChromeClient(new WebChromeClient() {
    @Override
    public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
        Log.w("webView", "Encountered an SSL error");
        // handler.proceed();
    }
});

You can ignore SSL errors by uncommenting the handler.proceed(); line, but it would be better to actually resolve the SSL issue.

Upvotes: 0

Related Questions