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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to make an android spinner with initial default text?
This example demonstrates how do I make an android spinner with initial default text 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.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.Toast; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity { Spinner spinner; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ...
Read MoreHow to parse JSON on Android?
This example demonstrates how to parse JSON 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.javapackage com.example.myapplication; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.TextView; import org.json.JSONException; import org.json.JSONObject; public class MainActivity extends AppCompatActivity { String JSON_STRING="{"employee":{"name":"adolf hitler", "salary":65000}}"; String name, salary; TextView employeeName, employeeSalary; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ...
Read MoreHow to make an ImageView with rounded corners on Android App?
This example demonstrates how to make an ImageView with rounded corners on Android App.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.javapackage com.example.sample; import android.graphics.Bitmap; import android.graphics.BitmapShader; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.RectF; import android.graphics.Shader; import android.graphics.drawable.BitmapDrawable; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.widget.ImageView; import android.widget.TextView; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) ...
Read MoreHow to parse JSON Objects on Android?
This example demonstrates how to parse JSON Objects on 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 dependency to Gradle Scripts ⇒ build.gradle and do syncapply plugin: 'com.android.application' android { compileSdkVersion 28 defaultConfig { applicationId "com.example.sample" minSdkVersion 21 targetSdkVersion 28 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } buildTypes { release { ...
Read MoreHow to get the difference between two dates in Android?
This example demonstrates how do I get the difference between two dates 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.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.TextView; import android.widget.Toast; import java.text.SimpleDateFormat; import java.util.Date; public class MainActivity extends AppCompatActivity{ TextView textView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView = findViewById(R.id.textView); ...
Read MoreHow to set OnclickListener on a radio button in android?
This example demonstrates how do I set OnclickListener on a radio button 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.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Toast; public class MainActivity extends AppCompatActivity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } ...
Read MoreHow to convert ISO 8601 string to Date/time object in Android?
This example demonstrates how do I convert ISO 8601 string to date/time object 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.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.TextView; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; public class MainActivity extends AppCompatActivity { TextView textView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView = findViewById(R.id.textView); ...
Read MoreHow can we disable the leaf of JTree in Java?
A JTree is a component that presents a hierarchical view of data. The user has the ability to expand or collapse individual sub-trees. A TreeNode interface defines the methods that must be implemented nodes of a JTree object. The DefaulMutableTreeNode class provides a default implementation of a TreeNode interface. We can disable the leaf of JTree by overriding the getTreeCellRendererComponent() method of DefaultTreeCellRenderer class.Syntaxpublic Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus)Exampleimport java.awt.*; import javax.swing.tree.*; import javax.swing.*; public class JTreeLeafNodeDisableTest extends JFrame { private TreeNode treeNode; private JTree tree; public JTreeLeafNodeDisableTest() { setTitle("JTreeLeafNodeDisable Test"); ...
Read MoreAndroid How to draw a smooth line following my finger?
This example demonstrates how do I draw a smooth line following my finger 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.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.Display; import android.view.MotionEvent; import android.view.View; import android.widget.ImageView; public class MainActivity extends AppCompatActivity implements View.OnTouchListener { ImageView imageView; Bitmap bitmap; Canvas canvas; Paint paint; float downX = ...
Read MoreHow to control the height and width of the default alert dialog in android?
This example demonstrates how do I control the height and width of the default alert dialog 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.app.Activity; import android.app.AlertDialog; import android.content.Context; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.view.WindowManager; import android.widget.Button; import android.widget.RelativeLayout; public class MainActivity extends AppCompatActivity{ Button button; RelativeLayout relativeLayout; Context ...
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