eclipse shortcut commands

Click to view shortcut command for eclipse IDE

What is thread in Java.

Thread is a program in execution. All Java programs have at least one thread, known as the main thread, which is created by the JVM at the program’s start, when the main() method is invoked with the main thread. In Java, creating a thread is accomplished by implementing an interface and extending a class. Every Java thread is created and controlled by the java.lang.Thread class.

When a thread is created, it is assigned a priority. The thread with higher priority is executed first, followed by lower-priority threads. The JVM stops executing threads under either of the following conditions:

• If the exit method has been invoked and authorized by the security manager


• All the daemon threads of the program have died

Explanation of oops concepts

Object means a real word entity such as pen, chair, table etc.Object-Oriented Programming is a methodology or paradigm to design a program using classes and objects. It simplifies the software development and maintenance by providing some concepts:

• Object
• Class
• Inheritance
• Polymorphism
• Abstraction
• Encapsulation

Object

Any entity that has state and behavior is known as an object. For example: chair, pen, table, keyboard, bike etc. It can be physical and logical.

Class

Collection of objects is called class. It is a logical entity.

Inheritance

When one object acquires all the properties and behaviours of parent object i.e. known as inheritance. It provides code reusability. It is used to achieve runtime polymorphism.

Polymorphism

When one task is performed by different ways i.e. known as polymorphism. For example: to convense the customer differently, to draw something e.g. shape or rectangle etc.

In java, we use method overloading and method overriding to achieve polymorphism.

Another example can be to speak something e.g. cat speaks meaw, dog barks woof etc.

Abstraction

Hiding internal details and showing functionality is known as abstraction. For example: phone call, we don't know the internal processing.

In java, we use abstract class and interface to achieve abstraction.

Encapsulation

Binding (or wrapping) code and data together into a single unit is known as encapsulation. For example: capsule, it is wrapped with different medicines.

A java class is the example of encapsulation. Java bean is the fully encapsulated class because all the data members are private here.

How to implement share via option in android

Intent i=new Intent(android.content.Intent.ACTION_SEND);
i.setType("text/plain");
i.putExtra(android.content.Intent.EXTRA_SUBJECT,"Subject test");
i.putExtra(android.content.Intent.EXTRA_TEXT, "extra text that you want to put");
startActivity(Intent.createChooser(i,"Share via"));

Android Tab Layout with swipe views

Click here to view code

Make phone call using intent in android

1. Add below permission in manifest file :

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

2. Use below code for phone call.

 String mobileno = "9999999999";

 String uri = "tel:" + mobileno.trim() ;
 Intent intent = new Intent(Intent.ACTION_CALL);
 intent.setData(Uri.parse(uri));
 startActivity(intent);

What is jQuery ?

jQuery is JavaScript library which contains predefined methods like show(), hide() etc.

In Javascript we are required so many lined of code for hide and display particular section, but in jQuery we are required only single line of code.

for using jQuery we required js file which contains all the predefined methods.

Download jquery js file

Prevent from android.os.NetworkOnMainThreadException

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();

StrictMode.setThreadPolicy(policy); 

How to load pdf file in your android application

WebView webview = (WebView) findViewById(R.id.webview);

webview.getSettings().setJavaScriptEnabled(true);

webview.getSettings().setBuiltInZoomControls(true);

webview.loadUrl("https://docs.google.com/gview?embedded=true&url=<PDF_COMPLETE_URL>");

webview.setWebViewClient(new WebViewClient() {
           @Override
           public void onPageFinished(WebView view, String url) {
                            
            }
});

Webview in android

WebView is a view that display web pages inside your application. You can also specify HTML string and can show it inside your application using WebView. WebView makes turns your application to a web application.

<WebView  xmlns:android="http://schemas.android.com/apk/res/android"
   android:id="@+id/webview"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
/>

WebView webview = (WebView) findViewById(R.id.webview);

webview.loadUrl("http://www.google.com");

If you click on any link inside the webpage of the webview, that page will not be loaded inside your webview so in that case we need to extend our class from WebViewClient and override its method.

private class MyBrowser extends WebViewClient {
   @Override
   public boolean shouldOverrideUrlLoading(WebView view, String url) {
      view.loadUrl(url);
      return true;
   }
}

How to call another activity in android?

1. Intent i = new Intent(getApplicationContext(), ActivityTwo.class);
2. startActivity(i);  

What is intent?

It is a kind of message or information that is passed to the components. It is used to launch an activity, display a web page, send sms, send email etc. There are two types of intents in android:

1. Implicit Intent : It is used to invoke the system components.
2. Explicit Intent : It is used to invoke the activity class.

What are the life cycle methods of android activity?

There are 7 life-cycle methods of activity. They are as follows:

1. onCreate()
2. onStart()
3. onResume()
4. onPause()
5. onStop()
6. onRestart()
7. onDestroy()

What is Android?

Android is an open-source, linux-based operating system that is used in mobiles, tablets, televisions etc.

Are JVM's platform independent?

JVM's are not platform independent. JVM's are platform specific run time implementation provided by the vendor.

What is a JVM?

JVM is Java Virtual Machine which is a run time environment for the compiled java class files.

How to create PATH and JAVA_HOME environment variables from command prompt (cmd)

>setx JAVA_HOME "C:\Program Files\Java\jdk1.8.0"

>setx PATH "%PATH%;%JAVA_HOME%\bin";

Java 7 Features

1. Strings in Switch:

public void testStringInSwitch(String param){
       final String JAVA5 = "Java 5";
       final String JAVA6 = "Java 6";
       final String JAVA7 = "Java 7";
       switch (param) {
           case JAVA5:
               System.out.println(JAVA5);
               break;
           case JAVA6:
               System.out.println(JAVA6);
               break;
           case JAVA7:
               System.out.println(JAVA7);
               break;
       }
   }
 
2. Binary Literals:

public void testBinaryIntegralLiterals(){
        int binary = 0b1000; //2^3 = 8
        if (binary == 8){
            System.out.println(true);
        } else{
            System.out.println(false);
        }
}

3. Underscore Between Literals:

public void testUnderscoresNumericLiterals() {
    int oneMillion_ = 1_000_000; //new
    int oneMillion = 1000000;
    if (oneMillion_ == oneMillion){
        System.out.println(true);
    } else{
        System.out.println(false);
    }
}

4. Diamond Syntax:

public void testDinamond(){
    List list = new ArrayList<>();
    Map> map = new HashMap<>();
}


5. Multi-Catch Similar Exceptions:

public void testMultiCatch(){
    try {
        throw new FileNotFoundException("FileNotFoundException");
    } catch (FileNotFoundException | IOException fnfo) {
        fnfo.printStackTrace();
    }
}


6. Try with Resources:

public void testTryWithResourcesStatement() throws FileNotFoundException, IOException{
    try (FileInputStream in = new FileInputStream("java7.txt")) {
        System.out.println(in.read());
    }
}  

Difference between path band classpath in Java

1).Path is an environment variable which is used by the operating system to find the executables.

Classpath is an environment variable which is used by the Java compiler to find the path, of classes.ie in J2EE we give the path of jar files.


2).PATH is nothing but setting up an environment for operating system. Operating System will look in this PATH for executables.

Classpath is nothing but setting up the environment for Java. Java will use to find compiled classes

3).Path refers to the system while classpath refers to the Developing Envornment.

In path we set the path of executables while in
classpath we set path of jars for compiling classes.

Random String Generation in Java

import java.util.Random;

public class RandomStringGen {


private static final String CHAR_LIST =
       "1234567890";
   private static final int RANDOM_STRING_LENGTH = 4;
   
   /**
    * This method generates random string
    * @return
    */
   public String generateRandomString(){
       
       StringBuffer randStr = new StringBuffer();
       for(int i=0; i<RANDOM_STRING_LENGTH; i++){
           int number = getRandomNumber();
           char ch = CHAR_LIST.charAt(number);
           randStr.append(ch);
       }
       return randStr.toString();
   }
   
   /**
    * This method generates random numbers
    * @return int
    */
   private int getRandomNumber() {
       int randomInt = 0;
       Random randomGenerator = new Random();
       randomInt = randomGenerator.nextInt(CHAR_LIST.length());
       if (randomInt - 1 == -1) {
           return randomInt;
       } else {
           return randomInt - 1;
       }
   }
   

}

Run task periodically in Java

Schedular Task :

For this functionality,

You should create a class extending TimerTask(available in java.util package). TimerTask is a abstract class.
Write your code in public void run() method that you want to execute periodically.
Insert below code in your Main class.

import java.util.TimerTask;
import java.util.Date;
/**
 * 
 * @author Dhinakaran P.
 */
// Create a class extends with TimerTask
public class ScheduledTask extends TimerTask {

Date now; // to display current time

// Add your task here
public void run() {
now = new Date(); // initialize date
System.out.println("Time is :" + now); // Display current time
}
}

Run Scheduler Task :

A class to run above scheduler task.

Instantiate Timer Object Timer time = new Timer();
Instantiate Scheduled Task class Object ScheduledTask st = new ScheduledTask();
Assign scheduled task through Timer.shedule() method.
import java.util.Timer;

/**
 * 
 * @author Dhinakaran P.
 */

//Main class
public class SchedulerMain {
public static void main(String args[]) throws InterruptedException {

Timer time = new Timer(); // Instantiate Timer Object
ScheduledTask st = new ScheduledTask(); // Instantiate SheduledTask class
time.schedule(st, 0, 1000); // Create Repetitively task for every 1 secs

//for demo only.
for (int i = 0; i <= 5; i++) {
System.out.println("Execution in Main Thread...." + i);
Thread.sleep(2000);
if (i == 5) {
System.out.println("Application Terminates");
System.exit(0);
}
}
}
}
Output:

Execution in Main Thread....0
Time is :Tue Jun 19 14:21:42 IST 2012
Time is :Tue Jun 19 14:21:43 IST 2012
Execution in Main Thread....1
Time is :Tue Jun 19 14:21:44 IST 2012
Time is :Tue Jun 19 14:21:45 IST 2012
Execution in Main Thread....2
Time is :Tue Jun 19 14:21:46 IST 2012
Time is :Tue Jun 19 14:21:47 IST 2012
Execution in Main Thread....3
Time is :Tue Jun 19 14:21:48 IST 2012
Time is :Tue Jun 19 14:21:49 IST 2012
Execution in Main Thread....4
Time is :Tue Jun 19 14:21:50 IST 2012
Time is :Tue Jun 19 14:21:51 IST 2012
Application Terminates
Time is :Tue Jun 19 14:21:52 IST 2012

Concurrency API in Java

The Concurrency API introduces the concept of an ExecutorService as a higher level replacement for working with threads directly. Executors are capable of running asynchronous tasks and typically manage a pool of threads, so we don't have to create new threads manually. All threads of the internal pool will be reused under the hood for revenant tasks, so we can run as many concurrent tasks as we want throughout the life-cycle of our application with a single executor service.

This is how the first thread-example looks like using executors:

ExecutorService executor = Executors.newSingleThreadExecutor();
executor.submit(() -> {
    String threadName = Thread.currentThread().getName();
    System.out.println("Hello " + threadName);
});

// => Hello pool-1-thread-1

The class Executors provides convenient factory methods for creating different kinds of executor services. In this sample we use an executor with a thread pool of size one.

The result looks similar to the above sample but when running the code you'll notice an important difference: the java process never stops! Executors have to be stopped explicitly - otherwise they keep listening for new tasks.

An ExecutorService provides two methods for that purpose: shutdown() waits for currently running tasks to finish while shutdownNow() interrupts all running tasks and shut the executor down immediately.

This is the preferred way how I typically shutdown executors:

try {
    System.out.println("attempt to shutdown executor");
    executor.shutdown();
    executor.awaitTermination(5, TimeUnit.SECONDS);
}
catch (InterruptedException e) {
    System.err.println("tasks interrupted");
}
finally {
    if (!executor.isTerminated()) {
        System.err.println("cancel non-finished tasks");
    }
    executor.shutdownNow();
    System.out.println("shutdown finished");
}

Implement google search in your android code

Use below link to view sample code :

Download Link

Implement horizontal scrolling of listview in android

Use below link to view sample code :

Download Link

Android Camera API

Use below link to download a code for implementing android camera api in your code :

Download Link

Android Permission with detailed description

A basic Android application has no permissions associated with it by default, meaning it cannot do anything that would adversely impact the user experience or any data on the device. To make use of protected features of the device, you must include one or more <uses-permission> tags in your app manifest.

List of android permission:

String	ACCESS_CHECKIN_PROPERTIES	Allows read/write access to the "properties" table in the checkin database, to change values that get uploaded.
String	ACCESS_COARSE_LOCATION	Allows an app to access approximate location.
String	ACCESS_FINE_LOCATION	Allows an app to access precise location.
String	ACCESS_LOCATION_EXTRA_COMMANDS	Allows an application to access extra location provider commands.
String	ACCESS_NETWORK_STATE	Allows applications to access information about networks.
String	ACCESS_NOTIFICATION_POLICY	Marker permission for applications that wish to access notification policy.
String	ACCESS_WIFI_STATE	Allows applications to access information about Wi-Fi networks.
String	ACCOUNT_MANAGER	Allows applications to call into AccountAuthenticators.
String	ADD_VOICEMAIL	Allows an application to add voicemails into the system.
String	BATTERY_STATS	Allows an application to collect battery statistics
String	BIND_ACCESSIBILITY_SERVICE	Must be required by an AccessibilityService, to ensure that only the system can bind to it.
String	BIND_APPWIDGET	Allows an application to tell the AppWidget service which application can access AppWidget's data.
String	BIND_CARRIER_MESSAGING_SERVICE	This constant was deprecated in API level 23. Use BIND_CARRIER_SERVICES instead
String	BIND_CARRIER_SERVICES	The system process that is allowed to bind to services in carrier apps will have this permission.
String	BIND_CHOOSER_TARGET_SERVICE	Must be required by a ChooserTargetService, to ensure that only the system can bind to it.
String	BIND_DEVICE_ADMIN	Must be required by device administration receiver, to ensure that only the system can interact with it.
String	BIND_DREAM_SERVICE	Must be required by an DreamService, to ensure that only the system can bind to it.
String	BIND_INCALL_SERVICE	Must be required by a InCallService, to ensure that only the system can bind to it.
String	BIND_INPUT_METHOD	Must be required by an InputMethodService, to ensure that only the system can bind to it.
String	BIND_MIDI_DEVICE_SERVICE	Must be required by an MidiDeviceService, to ensure that only the system can bind to it.
String	BIND_NFC_SERVICE	Must be required by a HostApduService or OffHostApduService to ensure that only the system can bind to it.
String	BIND_NOTIFICATION_LISTENER_SERVICE	Must be required by an NotificationListenerService, to ensure that only the system can bind to it.
String	BIND_PRINT_SERVICE	Must be required by a PrintService, to ensure that only the system can bind to it.
String	BIND_REMOTEVIEWS	Must be required by a RemoteViewsService, to ensure that only the system can bind to it.
String	BIND_TELECOM_CONNECTION_SERVICE	Must be required by a ConnectionService, to ensure that only the system can bind to it.
String	BIND_TEXT_SERVICE	Must be required by a TextService (eg SpellCheckerService) to ensure that only the system can bind to it.
String	BIND_TV_INPUT	Must be required by a TvInputService to ensure that only the system can bind to it.
String	BIND_VOICE_INTERACTION	Must be required by a VoiceInteractionService, to ensure that only the system can bind to it.
String	BIND_VPN_SERVICE	Must be required by a VpnService, to ensure that only the system can bind to it.
String	BIND_WALLPAPER	Must be required by a WallpaperService, to ensure that only the system can bind to it.
String	BLUETOOTH	Allows applications to connect to paired bluetooth devices.
String	BLUETOOTH_ADMIN	Allows applications to discover and pair bluetooth devices.
String	BLUETOOTH_PRIVILEGED	Allows applications to pair bluetooth devices without user interaction, and to allow or disallow phonebook access or message access.
String	BODY_SENSORS	Allows an application to access data from sensors that the user uses to measure what is happening inside his/her body, such as heart rate.
String	BROADCAST_PACKAGE_REMOVED	Allows an application to broadcast a notification that an application package has been removed.
String	BROADCAST_SMS	Allows an application to broadcast an SMS receipt notification.
String	BROADCAST_STICKY	Allows an application to broadcast sticky intents.
String	BROADCAST_WAP_PUSH	Allows an application to broadcast a WAP PUSH receipt notification.
String	CALL_PHONE	Allows an application to initiate a phone call without going through the Dialer user interface for the user to confirm the call.
String	CALL_PRIVILEGED	Allows an application to call any phone number, including emergency numbers, without going through the Dialer user interface for the user to confirm the call being placed.
String	CAMERA	Required to be able to access the camera device.
String	CAPTURE_AUDIO_OUTPUT	Allows an application to capture audio output.
String	CAPTURE_SECURE_VIDEO_OUTPUT	Allows an application to capture secure video output.
String	CAPTURE_VIDEO_OUTPUT	Allows an application to capture video output.
String	CHANGE_COMPONENT_ENABLED_STATE	Allows an application to change whether an application component (other than its own) is enabled or not.
String	CHANGE_CONFIGURATION	Allows an application to modify the current configuration, such as locale.
String	CHANGE_NETWORK_STATE	Allows applications to change network connectivity state.
String	CHANGE_WIFI_MULTICAST_STATE	Allows applications to enter Wi-Fi Multicast mode.
String	CHANGE_WIFI_STATE	Allows applications to change Wi-Fi connectivity state.
String	CLEAR_APP_CACHE	Allows an application to clear the caches of all installed applications on the device.
String	CONTROL_LOCATION_UPDATES	Allows enabling/disabling location update notifications from the radio.
String	DELETE_CACHE_FILES	Allows an application to delete cache files.
String	DELETE_PACKAGES	Allows an application to delete packages.
String	DIAGNOSTIC	Allows applications to RW to diagnostic resources.
String	DISABLE_KEYGUARD	Allows applications to disable the keyguard if it is not secure.
String	DUMP	Allows an application to retrieve state dump information from system services.
String	EXPAND_STATUS_BAR	Allows an application to expand or collapse the status bar.
String	FACTORY_TEST	Run as a manufacturer test application, running as the root user.
String	FLASHLIGHT	Allows access to the flashlight.
String	GET_ACCOUNTS	Allows access to the list of accounts in the Accounts Service.
String	GET_ACCOUNTS_PRIVILEGED	Allows access to the list of accounts in the Accounts Service.
String	GET_PACKAGE_SIZE	Allows an application to find out the space used by any package.
String	GET_TASKS	This constant was deprecated in API level 21. No longer enforced.
String	GLOBAL_SEARCH	This permission can be used on content providers to allow the global search system to access their data.
String	INSTALL_LOCATION_PROVIDER	Allows an application to install a location provider into the Location Manager.
String	INSTALL_PACKAGES	Allows an application to install packages.
String	INSTALL_SHORTCUT	Allows an application to install a shortcut in Launcher.
String	INTERNET	Allows applications to open network sockets.
String	KILL_BACKGROUND_PROCESSES	Allows an application to call killBackgroundProcesses(String).
String	LOCATION_HARDWARE	Allows an application to use location features in hardware, such as the geofencing api.
String	MANAGE_DOCUMENTS	Allows an application to manage access to documents, usually as part of a document picker.
String	MASTER_CLEAR	Not for use by third-party applications.
String	MEDIA_CONTENT_CONTROL	Allows an application to know what content is playing and control its playback.
String	MODIFY_AUDIO_SETTINGS	Allows an application to modify global audio settings.
String	MODIFY_PHONE_STATE	Allows modification of the telephony state - power on, mmi, etc.
String	MOUNT_FORMAT_FILESYSTEMS	Allows formatting file systems for removable storage.
String	MOUNT_UNMOUNT_FILESYSTEMS	Allows mounting and unmounting file systems for removable storage.
String	NFC	Allows applications to perform I/O operations over NFC.
String	PACKAGE_USAGE_STATS	Allows an application to collect component usage statistics Declaring the permission implies intention to use the API and the user of the device can grant permission through the Settings application.
String	PERSISTENT_ACTIVITY	This constant was deprecated in API level 9. This functionality will be removed in the future; please do not use. Allow an application to make its activities persistent.
String	PROCESS_OUTGOING_CALLS	Allows an application to see the number being dialed during an outgoing call with the option to redirect the call to a different number or abort the call altogether.
String	READ_CALENDAR	Allows an application to read the user's calendar data.
String	READ_CALL_LOG	Allows an application to read the user's call log.
String	READ_CONTACTS	Allows an application to read the user's contacts data.
String	READ_EXTERNAL_STORAGE	Allows an application to read from external storage.
String	READ_FRAME_BUFFER	Allows an application to take screen shots and more generally get access to the frame buffer data.
String	READ_INPUT_STATE	This constant was deprecated in API level 16. The API that used this permission has been removed.
String	READ_LOGS	Allows an application to read the low-level system log files.
String	READ_PHONE_STATE	Allows read only access to phone state.
String	READ_SMS	Allows an application to read SMS messages.
String	READ_SYNC_SETTINGS	Allows applications to read the sync settings.
String	READ_SYNC_STATS	Allows applications to read the sync stats.
String	READ_VOICEMAIL	Allows an application to read voicemails in the system.
String	REBOOT	Required to be able to reboot the device.
String	RECEIVE_BOOT_COMPLETED	Allows an application to receive the ACTION_BOOT_COMPLETED that is broadcast after the system finishes booting.
String	RECEIVE_MMS	Allows an application to monitor incoming MMS messages.
String	RECEIVE_SMS	Allows an application to receive SMS messages.
String	RECEIVE_WAP_PUSH	Allows an application to receive WAP push messages.
String	RECORD_AUDIO	Allows an application to record audio.
String	REORDER_TASKS	Allows an application to change the Z-order of tasks.
String	REQUEST_IGNORE_BATTERY_OPTIMIZATIONS	Permission an application must hold in order to useACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS.
String	REQUEST_INSTALL_PACKAGES	Allows an application to request installing packages.
String	RESTART_PACKAGES	This constant was deprecated in API level 8. The restartPackage(String) API is no longer supported.
String	SEND_RESPOND_VIA_MESSAGE	Allows an application (Phone) to send a request to other applications to handle the respond-via-message action during incoming calls.
String	SEND_SMS	Allows an application to send SMS messages.
String	SET_ALARM	Allows an application to broadcast an Intent to set an alarm for the user.
String	SET_ALWAYS_FINISH	Allows an application to control whether activities are immediately finished when put in the background.
String	SET_ANIMATION_SCALE	Modify the global animation scaling factor.
String	SET_DEBUG_APP	Configure an application for debugging.
String	SET_PREFERRED_APPLICATIONS	This constant was deprecated in API level 7. No longer useful, seeaddPackageToPreferred(String) for details.
String	SET_PROCESS_LIMIT	Allows an application to set the maximum number of (not needed) application processes that can be running.
String	SET_TIME	Allows applications to set the system time.
String	SET_TIME_ZONE	Allows applications to set the system time zone.
String	SET_WALLPAPER	Allows applications to set the wallpaper.
String	SET_WALLPAPER_HINTS	Allows applications to set the wallpaper hints.
String	SIGNAL_PERSISTENT_PROCESSES	Allow an application to request that a signal be sent to all persistent processes.
String	STATUS_BAR	Allows an application to open, close, or disable the status bar and its icons.
String	SYSTEM_ALERT_WINDOW	Allows an app to create windows using the type TYPE_SYSTEM_ALERT, shown on top of all other apps.
String	TRANSMIT_IR	Allows using the device's IR transmitter, if available.
String	UNINSTALL_SHORTCUT	Allows an application to uninstall a shortcut in Launcher.
String	UPDATE_DEVICE_STATS	Allows an application to update device statistics.
String	USE_FINGERPRINT	Allows an app to use fingerprint hardware.
String	USE_SIP	Allows an application to use SIP service.
String	VIBRATE	Allows access to the vibrator.
String	WAKE_LOCK	Allows using PowerManager WakeLocks to keep processor from sleeping or screen from dimming.
String	WRITE_APN_SETTINGS	Allows applications to write the apn settings.
String	WRITE_CALENDAR	Allows an application to write the user's calendar data.
String	WRITE_CALL_LOG	Allows an application to write (but not read) the user's contacts data.
String	WRITE_CONTACTS	Allows an application to write the user's contacts data.
String	WRITE_EXTERNAL_STORAGE	Allows an application to write to external storage.
String	WRITE_GSERVICES	Allows an application to modify the Google service map.
String	WRITE_SECURE_SETTINGS	Allows an application to read or write the secure system settings.
String	WRITE_SETTINGS	Allows an application to read or write the system settings.
String	WRITE_SYNC_SETTINGS	Allows applications to write the sync settings.
String	WRITE_VOICEMAIL	Allows an application to modify and remove existing voicemails in the system.