package com.email.view;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;

import android.content.Intent;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class HelloWebViewClient extends WebViewClient {

    @Override
     public boolean shouldOverrideUrlLoading(WebView view, String url) {         
         if (url.startsWith("mailto:")) {                    
            url = url.replaceFirst("mailto:", "");
                url = url.trim();
                try {
                url = URLDecoder.decode(url,"UTF-8");
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
        int subjectStart = url.indexOf("subject=");
                int subjectStop = url.indexOf("&body=");
                String subject = url.substring(subjectStart,subjectStop);
                subject = subject.replace("subject=", "");
                String bod = url.substring(subjectStop);
                bod = bod.replace("&body=", "");
                Intent i = new Intent(Intent.ACTION_SEND);
                i.setType("test/plain");
                i.putExtra(Intent.EXTRA_SUBJECT,subject);               
                i.putExtra(Intent.EXTRA_TEXT, bod);
                startActivity(i);
                return true;

     } else { 
         view.loadUrl(url);
         return true;
         }
     }

    private void startActivity(Intent i) {
        // TODO Auto-generated method stub
        
    }


}

package com.email.view;

import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebView;

public class WebViewExample extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        WebView webView = (WebView) findViewById(R.id.webview);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.loadUrl("http://xxxxxxxxxxxxxxxx/test.html");

        webView.setWebViewClient(new HelloWebViewClient());

    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.email.view"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".WebViewExample"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
    <uses-sdk android:minSdkVersion="5" />

<uses-permission android:name="android.permission.INTERNET"></uses-permission>
</manifest>

I/ActivityManager(   71): Starting: Intent { act=android.intent.action.MAIN cat=
[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.email.view/.We
bViewExample } from pid 372
W/WindowManager(   71): Failure taking screenshot for (230x143) to layer 21000
I/ActivityManager(   71): Start proc com.email.view for activity com.ema
il.view/.WebViewExample: pid=380 uid=10037 gids={3003}
D/AndroidRuntime(  372): Shutting down VM
I/AndroidRuntime(  372): NOTE: attach of thread 'Binder Thread #3' failed
D/dalvikvm(  372): GC_CONCURRENT freed 98K, 83% free 358K/2048K, paused 1ms+0ms
D/jdwp    (  372): adbd disconnected
D/TabletStatusBar(  122): lights on
D/dalvikvm(  380): GC_FOR_ALLOC freed 36K, 4% free 6311K/6531K, paused 74ms
I/dalvikvm-heap(  380): Grow heap (frag case) to 6.698MB for 513744-byte allocat
ion
D/dalvikvm(  380): GC_FOR_ALLOC freed <1K, 4% free 6812K/7047K, paused 61ms
D/dalvikvm(  380): GC_CONCURRENT freed <1K, 4% free 6812K/7047K, paused 7ms+6ms
V/TLINE   (  380): new: android.text.TextLine@406c91b8
W/webcore (  380): Not supported in this case.
I/ActivityManager(   71): Displayed com.email.view/.WebViewExample: +2s5
71ms (total +36s889ms)
I/ActivityManager(   71): Displayed com.android.launcher/com.android.launcher2.L
auncher: +36s891ms
D/dalvikvm(  145): GC_EXPLICIT freed 1105K, 8% free 14972K/16135K, paused 4ms+11
ms
W/asset   (  145): Asset path /data/app/com.email.view-2.apk is neither
a directory nor file (type=1).
W/PackageManager(  145): Failure retrieving resources forcom.email.view
W/asset   (  145): Asset path /data/app/com.email.view-2.apk is neither
a directory nor file (type=1).
W/PackageManager(  145): Failure retrieving resources forcom.email.view
W/asset   (  145): Asset path /data/app/com.email.view-2.apk is neither
a directory nor file (type=1).

V/TLINE   (  636): new: android.text.TextLine@406ddef8
W/webcore (  636): Not supported in this case.
D/dalvikvm(  145): GC_EXPLICIT freed 5K, 17% free 14160K/17031K, paused 4ms+1096
ms
I/ActivityManager(   71): Displayed com.email.view/.WebViewExample: +2s8
71ms
D/dalvikvm(  145): GC_EXPLICIT freed <1K, 17% free 14162K/17031K, paused 4ms+4ms

D/AndroidRuntime(  636): Shutting down VM
W/dalvikvm(  636): threadid=1: thread exiting with uncaught exception (group=0x4
0014760)
E/AndroidRuntime(  636): FATAL EXCEPTION: main
E/AndroidRuntime(  636): java.lang.StringIndexOutOfBoundsException: start=-1 end
=-1 length=12
E/AndroidRuntime(  636):        at java.lang.String.startEndAndLength(String.jav
a:598)
E/AndroidRuntime(  636):        at java.lang.String.substring(String.java:1561)
E/AndroidRuntime(  636):        at com.email.view.HelloWebViewClient.sho
uldOverrideUrlLoading(HelloWebViewClient.java:24)
E/AndroidRuntime(  636):        at android.webkit.CallbackProxy.uiOverrideUrlLoa
ding(CallbackProxy.java:222)
E/AndroidRuntime(  636):        at android.webkit.CallbackProxy.handleMessage(Ca
llbackProxy.java:322)
E/AndroidRuntime(  636):        at android.os.Handler.dispatchMessage(Handler.ja
va:99)
E/AndroidRuntime(  636):        at android.os.Looper.loop(Looper.java:132)
E/AndroidRuntime(  636):        at android.app.ActivityThread.main(ActivityThrea
d.java:4025)
E/AndroidRuntime(  636):        at java.lang.reflect.Method.invokeNative(Native
Method)
E/AndroidRuntime(  636):        at java.lang.reflect.Method.invoke(Method.java:4
91)
E/AndroidRuntime(  636):        at com.android.internal.os.ZygoteInit$MethodAndA
rgsCaller.run(ZygoteInit.java:841)
E/AndroidRuntime(  636):        at com.android.internal.os.ZygoteInit.main(Zygot
eInit.java:599)
E/AndroidRuntime(  636):        at dalvik.system.NativeStart.main(Native Method)

W/ActivityManager(   71):   Force finishing activity com.email.view/.Web
ViewExample