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This example demonstrates how do I add footer in Android ListView.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. Step 3 – Create a layout file.xml and name it as listView_footer.xml and add the following code − Step 4 − Add the following code to src/MainActivity.javaimport java.util.ArrayList; import java.util.Arrays; import java.util.List; import android.app.Activity; import android.os.Bundle; import android.view.LayoutInflater; import android.view.ViewGroup; import android.widget.ArrayAdapter; import ... Read More
This example demonstrates how do I send emails using gmail from my Android application.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.javaimport android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; public class MainActivity extends AppCompatActivity{ EditText editTextMail, editTextSubject, ... Read More
When you are writing a script and if you want to provide the user to select one option among multiple values and based on it to execute the command, we can generally use the Switch command and for it, we will ask the user choice in the below script.There is another .Net method to create a user menu, we will see it after the example from the description mentioned above.a. Switch command methodFor the Switch command-based user selection, we will first display the message for the user and then give him a choice for the selection through Read-Host command as ... Read More
This example demonstrates how do I turn on Flash light programatically in android.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.javaimport android.content.Context; import android.content.DialogInterface; import android.content.pm.PackageManager; import android.hardware.camera2.CameraAccessException; import android.hardware.camera2.CameraManager; import android.os.Bundle; import android.support.v7.app.AlertDialog; import android.support.v7.app.AppCompatActivity; import android.widget.CompoundButton; import android.widget.ToggleButton; public class MainActivity extends AppCompatActivity { private CameraManager mCameraManager; private String mCameraId; private ToggleButton toggleButton; ... Read More
A Java class file has a ".class" extension and contains the Java bytecode. This class file can be executed by the Java Virtual Machine (JVM). A ".class" file is created as a result of successful compilation by the Java compiler from the ".java" file. Each class in the .java file is compiled into a separate class file if the ".java " file has more than one class.Exampleclass A { A() { System.out.println("This is class A"); } } class B { B() { System.out.println("This is class B"); } } class C { ... Read More
SSL certificates are a very crucial part of the website. They play a key role in securing the exchange of information on both client and server sides by activating an HTTPS secure connection. In the below article with the PowerShell, we will get the certificate validity date (starting and expiry date) for the certificate using PowerShell.To achieve this, we need to make httpwebrequest but before that, we will ignore SSL warning by the below command.[Net.ServicePointManager]::ServerCertificateValidationCallback = { $true }And then we wil make the HTTP web request by calling a .Net class.$url = "https://www.microsoft.com/" $req = [Net.HttpWebRequest]::Create($url)When we check the ... Read More
Whenever you need to create an object which cannot be changed after initialization you can define an immutable object. There are no specific rules to create immutable objects, the idea is to restrict the access of the fields of a class after initialization.A Set is an interface in collection framework, which does not allow duplicate values.Method to convert a set to immutableYes, Java provides a method named unmodifiableSet() in the Collections class. This method accepts a collection object as a parameter and returns an unmodifiable i.ie immutable form of it.ExampleIn the following Java program, we have created a HashSet object ... Read More
When a value is assigned to a variable that is less than the minimum allowed value for that variable, then an underflow occurs. There is no exception thrown by the JVM if an underflow occurs in Java and it is the responsibility of a programmer to handle the underflow conditions.Examplepublic class UnderlowTest { public static void main(String[] args) { int num1 = -2147483648; int num2 = -1; System.out.println("Number 1: " + num1); System.out.println("Number 2: " + num2); long sum = (long)num1 + (long)num2; ... Read More
TreeSet provides an implementation of the Set interface that uses a tree for storage. Objects are stored in a sorted and ascending order.Access and retrieval times are quite fast, which makes TreeSet an excellent choice when storing large amounts of sorted information that must be found quickly.The reason is, if you look at the internal implementation of the TreeSet, it uses natural ordering, that means TreeSet uses Comparable interface by default to sort its value by comparing other value.Examplepublic class TreeSetDemo { public static void main(String args[]) { TreeSet treeSet = new TreeSet(); ... Read More
Array is a container which can hold a fix number of entities, which are of the same type. Each entity of an array is known as element and, the position of each element is indicated by an integer (starting from 0) value known as index.Exampleimport java.util.Arrays; public class ArrayExample { public static void main(String args[]) { Number integerArray[] = new Integer[3]; integerArray[0] = 25; integerArray[1] = 32; integerArray[2] = 56; System.out.println(Arrays.toString(integerArray)); } }Output[25, 32, 56]Whereas a Set object is a collection (object) stores ... Read More