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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to bring an activity to foreground i.e. top of stack in Android?
This example demonstrates how do I bring an activity to the foreground (top of stack) 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 androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.os.Bundle; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Intent i = new Intent(this, MyActivity.class); i.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT); ...
Read MoreHow to merge two JSON strings in an order using JsonParserSequence in Java?
The JsonParserSequence is a helper class that can be used to create a parser containing two sub-parsers placed in a particular sequence. We can create a sequence using the static method createFlattened() of the JsonParserSequence class.Syntaxpublic static JsonParserSequence createFlattened(JsonParser first, JsonParser second)Exampleimport java.io.*; import com.fasterxml.jackson.core.*; import com.fasterxml.jackson.core.util.*; public class JsonParserSequenceTest { public static void main(String[] args) throws JsonParseException, IOException { String jsonString1 = "{\"id\":\"101\", \"name\":\"Ravi Chandra\", \"address\":\"Pune\"}"; String jsonString2 = "{\"id\":\"102\", \"name\":\"Raja Ramesh\", \"address\":\"Hyderabad\", \"contacts\":[{\"mobile\":\"9959984805\", \"home\":\"7702144400\"}]}"; JsonFactory jsonFactory = new JsonFactory(); JsonParser jsonParser1 = jsonFactory.createParser(jsonString1); JsonParser jsonParser2 = jsonFactory.createParser(jsonString2); ...
Read MoreHow to check whether a headset is plugged into an Android device?
This example demonstrates how do I check whether a headset is plugged into an 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 androidx.appcompat.app.AppCompatActivity; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.os.Bundle; import android.widget.Toast; public class MainActivity extends AppCompatActivity { BroadcastReceiver broadcastReceiver; boolean Microphone_Plugged_in = false; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ...
Read MoreHow to map the JSON data with Jackson Object Model in Java?
The ObjectMapper class provides functionality for converting between Java objects and matching JSON constructs. We can achieve mapping of JSON data represented by an Object Model to a particular Java object using a tree-like data structure that reads and stores the entire JSON content in memory. In the first step, read the JSON data into the JsonNode object then mapped it to another instance by calling the treeToValue() method of ObjectMapper class.Syntaxpublic T treeToValue(TreeNode n, Class valueType) throws JsonProcessingExceptionExampleimport java.io.*; import com.fasterxml.jackson.core.*; import com.fasterxml.jackson.databind.*; public class JsonTreeModelDemo { public static void main(String[] args) throws JsonProcessingException, IOException { String jsonString ...
Read MoreHow to create directory programmatically in Android?
This example demonstrates how to create directory programmatically in AndroidStep 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.app.sample; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import java.io.File; import android.os.Bundle; import android.os.Environment; import android.app.Activity; import android.view.Menu; import android.widget.Toast; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); File file = new ...
Read MoreThe simplest way to get the user's current location on Android
This example demonstrates how do I get the user’s current location on android in the simplest way.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 dependency in Gradleimplementation 'com.google.android.gms:play-services-location:17.0.0'Step 4 − Add the following code to src/MainActivity.javaimport androidx.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity; import androidx.core.app.ActivityCompat; import androidx.core.content.ContextCompat; import android.Manifest; import android.content.Intent; import android.content.pm.PackageManager; import android.location.Geocoder; import android.location.Location; import android.os.Bundle; import android.os.Handler; import android.os.ResultReceiver; import android.util.Log; import android.widget.TextView; import android.widget.Toast; ...
Read MoreHow to use SpeechRecognizer API in Android App?
This example demonstrates how do I SpeechRecognizer API 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 app.com.sample; import androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.os.Bundle; import android.speech.RecognizerIntent; import android.widget.TextView; import java.util.List; public class MainActivity extends AppCompatActivity { private final int REQUEST_SPEECH_RECOGNIZER = 3000; private TextView textView; private final String mQuestion = "Which company is the largest online retailer on the planet?"; ...
Read MoreHow to work with Picasso in Android
This example demonstrates how to work with PicassoStep 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 app.com.sample; import androidx.appcompat.app.AppCompatActivity; import android.graphics.Bitmap; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.Toast; import com.squareup.picasso.Callback; import com.squareup.picasso.Picasso; import com.squareup.picasso.Target; public class MainActivity extends AppCompatActivity implements View.OnClickListener { ImageView imageView; int i ...
Read MoreHow to work with Glide in Android
This example demonstrates how to work with GlideStep 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 app.com.sample; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.ImageView; import com.bumptech.glide.Glide; import com.bumptech.glide.request.RequestOptions; public class MainActivity extends AppCompatActivity implements View.OnClickListener { ImageView imageView; Button btnDrawableImage, btnUrlImage, btnErrorImage, btnPlaceholderImage, btnResizeImage, btnRotateImage; @Override protected void onCreate(Bundle savedInstanceState) { ...
Read MoreHow to add table rows Dynamically in Android Layout?
This example demonstrates how to add table rows Dynamically in Android Layout.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.app.sample; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.app.ProgressDialog; import android.graphics.Color; import android.os.AsyncTask; import android.os.Bundle; import android.util.TypedValue; import android.view.Gravity; import android.view.View; import android.widget.FrameLayout; import android.widget.LinearLayout; import android.widget.TableLayout; import android.widget.TableRow; import android.widget.TextView; import java.math.BigDecimal; import java.text.DecimalFormat; import java.text.SimpleDateFormat; public class MainActivity extends AppCompatActivity { ...
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