Android Development

  TOAST   A Toast is short message display on the screen. Toast provide simple feedback message with a popup message. Toast automatically disappear after a timeout. Example :-   clicking  Send  on an email triggers a "Sending message..." toast. Context context = getApplicationContext (); CharSequence text = "Hello Shraddha Nand Pandey" ; int duration = Toast . LENGTH_SHORT ; Toast toast = Toast . makeText ( context , text , duration ); toast . show ();// in built function to show toast XML CODE:- <? xml version ="1.0" encoding ="utf-8" ?> < androidx.constraintlayout.widget.ConstraintLayout xmlns: android ="http://schemas.android.com/apk/res/android" xmlns: app ="http://schemas.android.com/apk/res-auto" xmlns: tools ="http://schemas.android.com/tools" android :layout_width ="match_parent" android :layout_height ="match_parent" tools :context =".MainActiv

 Dice Roller App using  Java In Android Studio <? xml version ="1.0" encoding ="utf-8" ?> < androidx.constraintlayout.widget.ConstraintLayout xmlns: android ="http://schemas.android.com/apk/res/android" xmlns: app ="http://schemas.android.com/apk/res-auto" xmlns: tools ="http://schemas.android.com/tools" android :layout_width ="match_parent" android :layout_height ="match_parent" android :background ="#29b6f6" tools :context =".MainActivity" > < ImageView android :id ="@+id/Image_view_dice" android :layout_width ="300dp" android :layout_height ="300dp" android :onClick ="play" android :src ="@drawable/one" app :layout_constraintBottom_toBottomOf ="parent" app :layout_constraintLeft_toLeftOf ="parent" app :layout_constraintR

 Music Player App in   Android Studio  Xml code:- <? xml version ="1.0" encoding ="utf-8" ?> < androidx.constraintlayout.widget.ConstraintLayout xmlns: android ="http://schemas.android.com/apk/res/android" xmlns: app ="http://schemas.android.com/apk/res-auto" xmlns: tools ="http://schemas.android.com/tools" android :layout_width ="match_parent" android :layout_height ="match_parent" tools :context =".MainActivity" > < TextView android :id ="@+id/textView" android :layout_width ="149dp" android :layout_height ="40dp" android :background ="#2196F3" android :gravity ="center" android :shadowColor ="#FFFFFF" android :text ="Music Player" android :textColor ="#FFFFFF" android :textSize ="24sp" android :text

 SWAPPING OF TWO NUMBER WITHOUT USING THIRD VARIABLE  (XOR Bitwise operator)  with the use of XOR bitwise operator we can swap two number without using third variable XOR(^) : help to inverse the binary or decimal number         ALGORITHM  Take two variable a and b assign value of a and b  (as we assign a=10 and b=15) then a = a^b ( value of a will change to 5 )           because   a  =10 =1 0 1 0  |    only one bit should be 1 so                           b =15 = 1 1 1 1  |    answer will be 1 or true                          a ^ b  =  0 1 0 1    .i.e. 5 now b = a^b (here a = 5 and b = 15) then, value of b =10           because    a  =5   =  0 1 0 1                               b =15 =  1 1 1 1                          a ^ b  =   1 0 1 0     a = a^b ( value of a will swap to 15)           because    a  =5   =  0 1 0 1                               b =10 =  1 0 1 0                         a ^ b  =   1 1 1 1   .i.e. 15   result a =15 and b=10 Java code    package com.company ; import

BITWISE OPERATOR package com.company ; public class Main { public static void main ( String [] args ) { //AND operator int x = 10 , y = 6 , z ; z = x & y ; //both bits should be 1 /* x y x&y 0 0 0 0 1 0 1 0 0 1 1 1 */ System . out . println ( "z=x&y : " + z ); //OR bitwise operator z = x | y ; //one of bits should be 1 /* x y x|y 0 0 0 0 1 1 1 0 1 1 1 1 */ System . out . println ( "z=x|y : " + z ); //XOR bitwise operator z = x ^ y ; //only one bits should be 1 /* x y x^y 0 0 0 0 1 0 1 0 0 1 1 0 */ System . out . println ( "z=x^y : " + z ); /*LEFT SHIFT operator * It will double the number by moving 1 place * Automati

 Queue     Demonstration of queue using linked list in JAVA    package com.company ; import java.util. Queue ; import java.util.LinkedList ; public class Main { public static void main ( String [] args ) { // write your code here Queue < Integer > q = new LinkedList <> (); q . add ( 10 ); q . add ( 1 ); q . add ( 8 ); q . add ( 4 ); q . add ( 7 ); q . add ( 89 ); System . out . println ( "The queue is: " + q ); } } The queue is: [10, 1, 8, 4, 7, 89] Process finished with exit code 0 Show peak of queue    package com.company ; import java.util. Queue ; import java.util.LinkedList ; public class Main { public static void main ( String [] args ) { // write your code here Queue < Integer > q = new LinkedList <> (); q . add ( 6 ); q . add ( 1 ); q . add ( 8 ); q . add ( 4 ); q . add ( 7 ); q . add ( 89 ); System