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To make it a unique identifier, the Package Name assigned is com. The Module Name entry is assigned automatically by default, it's the same as the application name.

#Simple android app program android

#Simple android app program install

#Simple android app program download

Assuming that the Java Development Kit (JDK) is installed on your machine, download Android Studio. Now let's create the same application in Android. After the user types a name and presses Enter, the welcome message is displayed with the entered name, as shown in Figure 1.įigure 1 Output of the Java program Creating an Android Project Similar to the Java Program When the program is run, it asks the user to enter a name. The entered name is then displayed on the screen by statement #8. Statements #5 and #6 ask the user to enter a name that is then assigned to the string name. Statement #4 defines a try.catch block to check for any errors that might have occurred while the reader entered the text. Statement #3 uses the istream reader to convert the data into string form. The entered text is stored in the form of Unicode characters. The reader will read from the standard input stream ( System.in) that is, from the keyboard. Statement #2 creates a reader called istream. In WelcomeMsg.java, statement #1 imports the packages required for input/output operations. InputStreamReader istream = new InputStreamReader(System.in) #2īufferedReader bufRead = new BufferedReader(istream) #3 For example, if the user enters the name "Kelly," the message, "Welcome Kelly!" appears on the screen. After entering the name, when the user presses Enter, a welcome message appears, including the name the user typed.

#Simple android app program code

The code shown in Listing 1 is a simple Java program called WelcomeMsg.java that asks the user to enter a name. Comments are added inside the code to understand the code in more detail.Learn More Buy Example: A Simple Java Program Below is the code for the MainActivity.java file. To display stored in sum we have to use setText() as follows: tText(final_sum.toString())įinal_sum stores the sum and it’s necessary to convert it to string(.toString()). store the added value in another variable. Now store the number in int form and apply addition. Here s11 stores the number entered in textbox 1.We have to do the same with another Textbox(e2).

Here we have used TextView because we only have to display text avoiding it being user-changeable. Now we have to input numbers in form of string using the getText() function. The input statement will be "String s11=e1.getText().toString() " Here num1 is id for textbox and we are just giving a variable name ‘e1’ to text box with id ‘num1’. Similarly, we have to use the same statement for the second textbox with the variable name ‘e2’. For the third text box, we have used "TextView t1=(TextView) findViewById(R.id.result) " Open the MainActivity.java file there within the class, make a method named doSum(View v). In this method, first of all, we have to link two EditText with variables so that we can use them for our input. So link those edit box with variables we have written "EditText e1=(EditText )findViewById(R.id.num1) "

Step 3: Working with the MainActivity.java file Split() String method in Java with examplesĪfter using this code the UI will be like:.Producer-Consumer solution using threads in Java.Method and Block Synchronization in Java.Naming a thread and fetching name of current thread in Java.What does start() function do in multithreading in Java?.Java Concurrency – yield(), sleep() and join() Methods.Lifecycle and States of a Thread in Java.Check if Email Address is Valid or not in Java.

#Simple android app program how to

How to open dialer in Android through Intent?.

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