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double accX = -x/SensorManager.GRAVITY_EARTH;
double accY = -y/SensorManager.GRAVITY_EARTH;
double accZ = z/SensorManager.GRAVITY_EARTH;
double totAcc = Math.sqrt((accX*accX)+(accY*accY)+(accZ*accZ));
double tiltX = Math.asin(accX/totAcc);
double tiltY = Math.asin(accY/totAcc);
double tiltZ = Math.asin(accZ/totAcc);

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/* Way one */ 
android.os.Process.killProcess(android.os.Process.myPid()) 
   
/* Way Two */ 
System.exit(0);

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WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE); 
wifi.setWifiEnabled(enabled);

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*@return boolean return true if the application can access the internet
*/ 
private boolean haveInternet(){ 
     NetworkInfo info=(ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE).getActiveNetworkInfo(); 
     if(info==null || !info.isConnected()){ 
         return false; 
     } 
     if(info.isRoaming()){ 
         //here is the roaming option you can change it if you want to disable internet while roaming, just return false 
         return true; 

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//Present you with the dialler

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    Uri telUri = Uri.parse("tel:100861"); 
    returnIt = new Intent(Intent.ACTION_DIAL, telUri);  



// Start the call

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private String getMyNumber(){ 
     TelephonyManager mTelephonyMgr; 
     mTelephonyMgr = (TelephonyManager) 
         getSystemService(Context.TELEPHONY_SERVICE);   
     return mTelephonyMgr.getLine1Number(); 
}

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    private double gps2m(float lat_a, float lng_a, float lat_b, float lng_b) { 
         float pk = (float) (180/3.14169); 
       
         float a1 = lat_a / pk; 
         float a2 = lng_a / pk; 
         float b1 = lat_b / pk; 
         float b2 = lng_b / pk; 
       
         float t1 = FloatMath.cos(a1)*FloatMath.cos(a2)*FloatMath.cos(b1)*FloatMath.cos(b2); 
         float t2 = FloatMath.cos(a1)*FloatMath.sin(a2)*FloatMath.cos(b1)*FloatMath.sin(b2); 

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//Basic contact information stored in Contacts table with detailed information stored in individual //tables for normalization. In Android 2.0 to query the base contact records the URI to query is stored //in ContactsContract.Contacts.CONTENT_URI. 

   ContentResolver cr = getContentResolver();

    Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI,
    null, null, null, null);

    if (cur.getCount() > 0) {
    while (cur.moveToNext()) {
    String id = cur.getString(

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//retrieving phone numbers
//Phone numbers are stored in their own table and need to be queried separately. To query the phone //number table use the URI stored in the SDK variable ContactsContract.CommonDataKinds.Phone.CONTENT_URI. //Use a WHERE conditional to get the phone numbers for the specified contact.

    if (Integer.parseInt(cur.getString(
    cur.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {
    Cursor pCur = cr.query(
    ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
    null,ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = ?",
    new String[]{id}, null);

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//Querying email addresses is similar to phone numbers. A query must be performed to get email addresses //from the database. Query the URI stored in ContactsContract.CommonDataKinds.Email.CONTENT_URI to query the //email address table.

    Cursor emailCur = cr.query(
    ContactsContract.CommonDataKinds.Email.CONTENT_URI,
    null,ContactsContract.CommonDataKinds.Email.CONTACT_ID + " = ?",
    new String[]{id}, null);

    while (emailCur.moveToNext()) {
    // This would allow you get several email addresses
    // if the email addresses were stored in an array