Prevent webview from showing "web page not available"

Apply the below Code,

WebView.setWebViewClient(new WebViewClient() {
    public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
        WebView.loadUrl("file:///android_asset/myerrorpage.html");

    }
});

Android Internet Connection checking

private boolean isNetworkConnected() 

{

ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo ni = cm.getActiveNetworkInfo();
if (ni == null) 

{
       //There are no active networks.       return false;
} 

else
{

        return true;
}

}

The above function will return true only if the device has internet connection otherwise false.

manifest file permissions,

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

WebView Unicode Support

mWebView.loadDataWithBaseURL(null, "தமிழில் கணினி", "text/html", "utf-8", null);
OR
WebSettings settings = mWebView.getSettings();
settings.setDefaultTextEncodingName("utf-8");

Load Image from URL

Use the following code to display the picture in ImageView,
URL url = new URL("http://www.vijaynetwork.com/vijay_top_logo.jpg");
Bitmap bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
imageView.setImageBitmap(bmp);

How to open a new layout after button click in android

Use the below code,

 Button next = (Button) findViewById(R.id.mybutton1);

next.setOnClickListener(new View.OnClickListener()
{
            public void onClick(View view)
          {
                Intent myIntent = new Intent(view.getContext(), my_activity.class);
                startActivityForResult(myIntent, 0);
            }

   });

How to write static HTML code in WebView control

Apply the below code,

webView = (WebView) findViewById(R.id.webView1);

webViewSettings = webView.getSettings();

webViewSettings.setJavaScriptCanOpenWindowsAutomatically(true);

webViewSettings.setJavaScriptEnabled(true);

webViewSettings.setBuiltInZoomControls(true);

webViewSettings.setPluginState(PluginState.ON);

webView.getSettings().setJavaScriptEnabled(true);

String data="<h1>welcome to Android example..Write your own HTML code here..</h1><br>";

webView.loadData(data, "text/html","utf-8");

How to enable Java Script in WebView

       myWebView = (WebView) findViewById(R.id.WebView1);
       WebSettings webSettings = myWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);