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Display All Contacts from Contacts application in ListView Above output checked in Real Device. xml files under values folder: strings.xml: <?xml version="1.0" encoding="utf-8"?> <resources>     <string name="app_name">Display All Contacts</string>     <string name="action_settings">Settings</string>     <string name="hello_world">Hello world!</string>     <string name="btitle">Load Contacts</string> </resources>   xml files under layout folder: activity_main.xml: <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/LinearLayout1"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical" >     <Button         android:id="@+id

Working with Multiple Button Android Example Multiple Button Example activity_main.xml <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:paddingBottom="@dimen/activity_vertical_margin"     android:paddingLeft="@dimen/activity_horizontal_margin"     android:paddingRight="@dimen/activity_horizontal_margin"     android:paddingTop="@dimen/activity_vertical_margin"     tools:context="com.example.desktop.buttonexample.MainActivity">     <Button         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="button 1"         android:id="@+id/button1"         android:

Android Button Example MainActivity.java package com.example.desktop.buttonexample; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.Toast; public class MainActivity extends AppCompatActivity { protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout. activity_main ); Button btn =(Button)findViewById(R.id. button ); btn.setOnClickListener( new View.OnClickListener() { public void onClick(View v) { Toast. makeText (MainActivity. this , "Button clicked" ,Toast. LENGTH_SHORT ).show(); } }); } } activity_maain.xml <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.andr

JSON Example JSON :- JavaScript Object Notation It contains key/value pairs Key-> Strings Values:->JSON {}   :-> JSON Object []    :-> JSON array Syntax : { "employees" :[     { "firstName" : "John" ,  "lastName" : "Doe" },     { "firstName" : "Anna" ,  "lastName" : "Smith" },     { "firstName" : "Peter" ,  "lastName" : "Jones" } ]} package  csdevbin.json; import  android.support.v7.app.AppCompatActivity; import  android.os.Bundle; import  android.widget.TextView; import  org.json.JSONObject; public class  MainActivity  extends  AppCompatActivity {      public static final  String  JSON_STRING  =  "{ \" employee \" :{ \" name \" : \" John \" , \" salary \" :6000}}" ;      @Override      public void  onCreate(Bundle savedInstanceState) {          super .onCreate(savedInstanc

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