Tag Archives: java

java

Setting button actions programatically in Java, Python, JavaScript, SWIFT and Kotlin

By | January 9, 2024

Button action calls for an action when user tap on a button. This may be for making a service call, for doing some calculation or simply just to dismiss a view. Here are the different ways of setting button action in different languages. Java Python (TKinter) JavaScript: Swift Kotlin These examples demonstrate how to set… Read More »

Three common errors in Python programming along with examples

By | January 5, 2024

1. Syntax ErrorExample: 2. IndentationErrorExample: Explanation: Python relies on indentation to define block structures. The print statement is not properly indented under the if statement, leading to an indentation error. 3.NameErrorExample: Explanation: The variable y is not defined before trying to print it, resulting in a NameError. It’s worth noting that the examples provided are… Read More »

Convert a date from Central Standard Time (CST) to Indian Standard Time (IST)

By | January 2, 2024

To convert a date from Central Standard Time (CST) to Indian Standard Time (IST), you need to consider the time zone difference between these two zones. Below are examples in Swift : Swift: Java: Python: JavaScript: These examples assume a specific date and time format. You should adjust the date format and time zone identifiers… Read More »

Problem: There are N prisoners standing in a circle, waiting to be executed…

By | June 27, 2023

There are N prisoners standing in a circle, waiting to be executed. The executions are carried out starting with the kth person, and removing every successive kth person going clockwise until there is no one left. Given N and k, write an algorithm to determine where a prisoner should stand in order to be the… Read More »

Given a sorted array, find the smallest positive integer that is not the sum of a subset of the array.

By | June 27, 2023

Java public class SmallestPositiveInteger {    public static int findSmallestPositiveInteger(int[] nums) {        int smallest = 1;        for (int num : nums) {            if (num <= smallest) {                smallest += num;            } else… Read More »

Class has not initialiser error in Swift – Solved.

By | August 14, 2017

Apart from other languages, when you write a class in Swift, It should have a initialiser. To solve this we have to write init() function in that particular class. Just like below. For example, look at the below class. Here we have 5 variables. The above error usually comes when you don’t initialize all variables… Read More »

Uploading Image to Server – Android Eclipse Version.

By | February 18, 2016

Hi all, In today’s tutorial I will show you how to send an image to server using POST method in ANDROID. If you are working in Android studio, then checkout the article here. Uploading an image to server is a basic requirement in many of our application. Sending data to server which is using a… Read More »

How to draw Arcs in Android using canvas?

By | January 10, 2013

This is a simple example showing how to draw Arcs in android, You can use this to create piecharts or someother similar thing you want. Here we have 3 classes. 1. GraphicsActivity.java 2. MainActivity.java 3. PictureLayout.java GraphicsActivity.java PictureLayout.java MainActivity.java Download the complete source code from here.

How to crop an Image in Android?

By | December 15, 2012

This is a sample program that launches the camera and crop the captured image. Check this link to another crop image example. http://www.coderzheaven.com/2011/03/15/crop-an-image-in-android/ This is the layout xml. activity_main.xml Now this is the Main Java File that implements the crop functionality. Here we are using the “com.android.camera.action.CROP” Intent to crop the Image passing the captured… Read More »

How to load a spinner with values from SQlite Database in android?

By | November 18, 2012

Here is a simple example showing how to load a database values in a spinner in android. OK we will start. This is the layout for the spinner row. spinner_row.xml This is the layout for the interface. activity_main.xml Now this is the MainActivity.java file that uses the spinner and the database. Join the Forum discussion… Read More »

How to create a Slide from Left animation while deleting a row from a ListView in Android?

By | September 12, 2012

Hello all…… I have written a lost of posts on Listviews. You can see that by just searching Listviews in my site. Today I will show you how to create a slide out animation while we delete a row from a ListView. So this is the xml that contains the ListView. Let it be in… Read More »

Using Tabbars in ANDROID, A Simple Example……….

By | April 22, 2012

This is a simple example showing how to use tabbars in ANDROID. First create a new project and copy this code to it. Now create three another java files by right clicking the src folder and name it FirstTab.java, SecondTab.java, ThirdTab.java. Now copy the following code to FirstTab.java. SecondTab.java Now ThirdTab.java. Main.xml file AndroidManifest.xml You… Read More »

Java Applet MouseEvents

By | April 22, 2012

A simple event based applet applications is described below First importing the necessary header files // Demonstrate the mouse event handlers. import java.awt.*; import java.awt.event.*; import java.applet.*; /* <applet code=”MouseEvents” width=300 height=100> </applet> */ Next step is to create a class which implements the “MouseListener” and “MouseMotionListener “ public class MouseEvents extends Applet implements MouseListener, MouseMotionListener {… Read More »

Simulate a Balloon in Box2D, iPhone or ANDROID

By | April 12, 2012

Hello……… Sometimes you may want your body to act against the gravity of the world. One method to do this is described below. First what you have to do is to make a body in the shape of a circle and give it the image of a balloon as the userdata. Then in the tick… Read More »

Date and TimePicker in ANDROID.

By | April 12, 2012

The following code simply allows you to select a date and time using the datepicker and timepicker in ANDROID.

Saving Key-Value pair in Windows Phone using IsolatedStorageSettings

By | April 12, 2012

This sample code helps you to save a key and a corresponding value in windows Phone inside your application sandbox with the help of isolatedStorageSettings. PLease check this post before working around this post. How to save a text file in Windows Phone 7 or How to use isolated storage settings in Windows Phone 7?… Read More »

Switch Images in ANDROID.

By | April 7, 2012

Hi all …….. Ofter we have trouble with loading continous images in ANDROID from our application directory. The reason is that all resources have a unique resource ID which we need to get to load these resources. The following example shows how to get these unique identifier from the “path” of the resource. For example… Read More »

CustomAlert without any custom Layout in android.

By | February 6, 2012

We can create a dialog with custom alert dialog with our xml in android. But for making simple alerts we can make custom alerts through code itself. Here is a simple function for this. Here I am having a Listview and an edittext with two buttons in the alertBox. Please leave your valuable comments on… Read More »

How to Upload Multiple files in one request along with other string parameters in android?

By | August 16, 2011

Hello everyone, I have shown two methods to upload files in android. In today’s tutorial I will show another simple method to upload files. With this method you can upload multiple files in one request + you can send your own string parameters with them. Here is another method on working with uploading of images.… Read More »