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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to add custom adapter for my listView on Android?
This example demonstrates how do I add custom adapter for my listView 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.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.widget.ListView; import java.util.ArrayList; public class MainActivity extends AppCompatActivity { ListView listView; ArrayList arrayList = new ArrayList(); MyAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ...
Read MoreHow to find Serial number of Android device?
This example demonstrates how do I find serial number of android device.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.Manifest; import android.app.AlertDialog; import android.content.pm.PackageManager; import android.support.v4.content.ContextCompat; import android.os.Build; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.telephony.TelephonyManager; import android.view.View; import android.widget.Toast; public class MainActivity extends AppCompatActivity { public static final int REQUEST_CODE_PHONE_STATE_READ = 100; private int checkedPermission = PackageManager.PERMISSION_DENIED; TelephonyManager ...
Read MoreHow to draw text on Image in Android?
This example demonstrates how do I draw text on imagein 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.graphics.Color; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.TextView; public class MainActivity extends AppCompatActivity { TextView textView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView = findViewById(R.id.text); textView.setText("This ...
Read MoreHow to run an Android service always in background?
This example demonstrates how do I run an android service always in background.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 – Right click on the project, Select New >> Service >> Service and add the following to MyServices.javapackage app.com.sample; import android.app.Service; import android.content.Intent; import android.os.IBinder; import android.widget.Toast; public class MyService extends Service { public MyService() { } @Override public int onStartCommand(Intent intent, int flags, int ...
Read MoreHow to show soft Keyboard based on Android EditText is focused?
This example demonstrates how do I show soft keyboard based on Android EditText is focused.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.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.view.inputmethod.InputMethodManager; import android.widget.EditText; public class MainActivity extends AppCompatActivity { EditText editText; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); editText ...
Read MoreHow to implement a rollover effect for a JButton in Java?
A JButton is a subclass of AbstractButton and it can be used for adding platform-independent buttons to a GUI application. A JButon can generate an ActionListener interface when the button is pressed or clicked, it can also generate the MouseListener and KeyListener interfaces. We can implement the rollover effect when the mouse moves over a JButton by overriding the mouseEntered() method of the MouseListener interface.Syntaxvoid mouseEntered(MouseEvent e)Exampleimport java.awt.*; import java.awt.event.*; import javax.swing.*; public class RollOverButtonTest extends JFrame { private JButton button; public RollOverButtonTest() { setTitle("RollOverButton Test"); ...
Read MoreWhat is Byzantine Fault Tolerance?
Satoshi Nakamoto created Bitcoin in 2008, and he made the network very strong as a distributed, peer to peer model which is maintained without any intermediaries. Since then many digital currencies are created, which follow the same system where all nodes are sharing same information (same copy of Block chain) and any node can communicate with any other node safely across the network, knowing that they are displaying same data.Byzantine Fault Tolerance (BFT) is one of the most difficult challenges faced by the Block chain technology. All the participants of the cryptocurrency network need to agree, or give consensus regularly ...
Read MoreIs there any alternative for CONCAT() in MySQL?
Yes, an alternative is CONCAT_WS(). Let us first create a table −mysql> create table DemoTable ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(100) ); Query OK, 0 rows affected (0.74 sec)ExampleInsert some records in the table using insert command −mysql> insert into DemoTable(StudentName) values('Chris'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(StudentName) values('Robert'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(StudentName) values('Bob'); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+-----------+-------------+ | StudentId | StudentName | +-----------+-------------+ | ...
Read MoreSelect query to display duplicate values with max date
For this, use GROUP BY and HAVING. Let us first create a table −mysql> create table DemoTable ( StudentName varchar(100), DueDate date ); Query OK, 0 rows affected (0.72 sec)ExampleInsert some records in the table using insert command −mysql> insert into DemoTable values('John', '2019-01-11'); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable values('Chris', '2019-02-11'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('Chris', '2019-03-11'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('John', '2019-04-11'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('Bob', '2019-05-11'); ...
Read MoreImplementing incremental search and display the values with a specific number in MySQL?
For this, you can use SUBSTRING_INDEX(). Let us first create a table −mysql> create table DemoTable (Number varchar(100)); Query OK, 0 rows affected (0.60 sec)ExampleInsert some records in the table using insert command −mysql> insert into DemoTable values('235678'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('1634990'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values('678590'); Query OK, 1 row affected (0.46 sec) mysql> insert into DemoTable values('908765432'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('222343388773'); Query OK, 1 row affected (0.35 sec) mysql> insert into DemoTable values('09028215'); Query OK, ...
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