WebViewLoadUrl() in background with asyntask -

Question

I am trying to load a webview in the background using asyntask, while displaying a splashscreen, when the webview is done loading, i would like the splashscreen to disappear and show the webview. For some reason i am getting a lot of errors in LogCat, when i try to compile and run the code in the emulator.

MainActivity.java

package dk.zerone.vuc;

import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.util.Log;
import android.view.Menu;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends Activity {

public final boolean networkCheck() {
    ConnectivityManager connec =  (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);

    if ( connec.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED ||
    connec.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTING ||
    connec.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTING ||
    connec.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTED ) {
        return true;
    } else if (connec.getNetworkInfo(0).getState() == NetworkInfo.State.DISCONNECTED || connec.getNetworkInfo(1).getState() == NetworkInfo.State.DISCONNECTED  ) {
        return false;
    }
    return false;
}

// The definition of our task class
   private class LoadWebView extends AsyncTask<String, Integer, String> {
   @Override
   protected void onPreExecute() {
      super.onPreExecute();
   }

   protected String doInBackground(String... params) {
      String url = params[0];
       WebView webview = new WebView(MainActivity.this);
       webview.loadUrl(url);
       Log.i("WebView", "doInBackground: Done loading url.");
      return "";
   }

   protected void onPostExecute(String result) {
      super.onPostExecute(result);

      }
   }

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    /* Splash screen */
    setContentView(R.layout.splash);

    if(networkCheck()) {

        //Instantiating the webview, occupies the whole screen.
        //WebView webview = new WebView(this);
        //webview.loadUrl("http://mobil.vucfyn.dk/mobil");

        new LoadWebView().execute("http://mobil.vucfyn.dk/mobil");
        setContentView(R.layout.webview);
        Log.i("WebView", "Execute asyntask");

        /*webview.setWebViewClient(new WebViewClient() {
              @Override
              public void onPageFinished(WebView view, String url) {
                //super.onPageFinished(view, url);
                  Log.i("WebView", "Finished loading.");
                setContentView(R.layout.webview);
              }
            });*/

    } else {
        AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create();
        alertDialog.setTitle("Fejl");
        alertDialog.setMessage("Ingen forbindelse til internettet");

        alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {

            }
        });
        alertDialog.show();
    }
  }

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
} 
}

Error messages from LogCat:

08-25 11:32:11.544: D/dalvikvm(549): GC_FOR_ALLOC freed 67K, 3% free 10191K/10503K, paused 60ms
08-25 11:32:11.563: I/dalvikvm-heap(549): Grow heap (frag case) to 11.036MB for 1048592-byte allocation
08-25 11:32:11.633: D/dalvikvm(549): GC_CONCURRENT freed 1K, 4% free 11214K/11591K, paused 6ms+3ms
08-25 11:32:11.713: I/WebView(549): SetContentView webview
08-25 11:32:11.733: I/WebView(549): Execute asyntask
08-25 11:32:11.923: D/gralloc_goldfish(549): Emulator without GPU emulation detected.
08-25 11:32:12.593: W/dalvikvm(549): threadid=11: thread exiting with uncaught exception (group=0x409961f8)
08-25 11:32:12.646: E/AndroidRuntime(549): FATAL EXCEPTION: AsyncTask #1
08-25 11:32:12.646: E/AndroidRuntime(549): java.lang.RuntimeException: An error occured while executing doInBackground()
08-25 11:32:12.646: E/AndroidRuntime(549):  at android.os.AsyncTask$3.done(AsyncTask.java:278)
08-25 11:32:12.646: E/AndroidRuntime(549):  at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
08-25 11:32:12.646: E/AndroidRuntime(549):  at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
08-25 11:32:12.646: E/AndroidRuntime(549):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
08-25 11:32:12.646: E/AndroidRuntime(549):  at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-25 11:32:12.646: E/AndroidRuntime(549):  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
08-25 11:32:12.646: E/AndroidRuntime(549):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
08-25 11:32:12.646: E/AndroidRuntime(549):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
08-25 11:32:12.646: E/AndroidRuntime(549):  at java.lang.Thread.run(Thread.java:856)
08-25 11:32:12.646: E/AndroidRuntime(549): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
08-25 11:32:12.646: E/AndroidRuntime(549):  at android.os.Handler.<init>(Handler.java:121)
08-25 11:32:12.646: E/AndroidRuntime(549):  at android.webkit.WebView$PrivateHandler.<init>(WebView.java:8211)
08-25 11:32:12.646: E/AndroidRuntime(549):  at android.webkit.WebView.<init>(WebView.java:437)
08-25 11:32:12.646: E/AndroidRuntime(549):  at android.webkit.WebView.<init>(WebView.java:1040)
08-25 11:32:12.646: E/AndroidRuntime(549):  at android.webkit.WebView.<init>(WebView.java:1029)
08-25 11:32:12.646: E/AndroidRuntime(549):  at android.webkit.WebView.<init>(WebView.java:1019)
08-25 11:32:12.646: E/AndroidRuntime(549):  at android.webkit.WebView.<init>(WebView.java:1010)
08-25 11:32:12.646: E/AndroidRuntime(549):  at dk.zerone.vuc.MainActivity$LoadWebView.doInBackground(MainActivity.java:42)
08-25 11:32:12.646: E/AndroidRuntime(549):  at dk.zerone.vuc.MainActivity$LoadWebView.doInBackground(MainActivity.java:1)
08-25 11:32:12.646: E/AndroidRuntime(549):  at android.os.AsyncTask$2.call(AsyncTask.java:264)
08-25 11:32:12.646: E/AndroidRuntime(549):  at java.util.concurrent.FutureTask$Sync.innerRun  (FutureTask.java:305)
08-25 11:32:12.646: E/AndroidRuntime(549):  ... 5 more
08-25 11:32:16.363: I/Process(549): Sending signal. PID: 549 SIG: 9

I don't know whats wrong, any help is greatly appreciated.

Update:

package dk.zerone.vuc;

import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Color;
import android.view.Menu;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends Activity {

public final boolean networkCheck() {
    ConnectivityManager connec =  (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);

    if ( connec.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED ||
    connec.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTING ||
    connec.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTING ||
    connec.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTED ) {
        return true;
    } else if (connec.getNetworkInfo(0).getState() == NetworkInfo.State.DISCONNECTED || connec.getNetworkInfo(1).getState() == NetworkInfo.State.DISCONNECTED  ) {
        return false;
    }
    return false;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    /* Splash screen */
    setContentView(R.layout.splash);

    if(networkCheck()) {

        String url = "http://mobil.vucfyn.dk/mobil";

        final WebView webview; 
        webview = new WebView(MainActivity.this);

        webview.loadUrl(url); 

        webview.setWebViewClient(new WebViewClient() { 
            @Override 
            public boolean shouldOverrideUrlLoading(WebView view, String url) {     
                //view.loadUrl(url);     
                return false;
            } 

            @Override 
            public void onPageFinished(WebView view, String url) { 
                super.onPageFinished(view, url); 
                setContentView(webview);
             } 
        });

    } else {
        AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create();
        alertDialog.setTitle("Fejl");
        alertDialog.setMessage("Ingen forbindelse til internettet");

        alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {

            }
        });
        alertDialog.show();
    }
  }

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
} 
}

Answer 1

Enabling JavaScript did the trick.

    webview.getSettings().setJavaScriptEnabled(true);

Answer 2

The problem is you are initializing even the webview in non ui thread. Move the initialization part outside doinbackground. Move below line to OnPreexcecute better still move it to Oncreate

WebView webview;

webview = new WebView(MainActivity.this);

Edit:

For the Edited code, the webview is not showing up because you are not setting the correct content

use

setContentView(webview);

inside onpagefinished

Answer 3

Why you are using AsyncTask This can be easily achieve by this...

Better to use this

WebView webview = new WebView(MainActivity.this);
webview.loadUrl(url);

webview.setWebViewClient(new WebViewClient() {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {    
        view.loadUrl(url);    
         return false;
    }

    @Override
    public void onPageFinished(WebView view, String url) {
    super.onPageFinished(view, url);

           //------>> EXIT YOUR SPLASH SCREEN HERE
     }
});