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Articles on Trending Technologies
Technical articles with clear explanations and examples
FieldNamingPolicy enum using Gson in Java?
Gson library provides the naming conventions as part of enum FieldNamingPolicy. We can set the field naming policy using the setFieldNamingPolicy() method of the GsonBuilder class.FieldNamingPolicy enum ConstantsIDENTITY − Using this naming policy, the field name is unchanged.LOWER_CASE_WITH_DASHES − Using this naming policy, modify the Java Field name from its camel-cased form to a lower case field name where each word is separated by a dash (-).LOWER_CASE_WITH_UNDERSCORES − Using this naming policy, modify the Java Field name from its camel-cased form to a lower case field name where each word is separated by an underscore (_).UPPER_CAMEL_CASE − Using this naming ...
Read MoreHow to get the values of a key using the JsonPointer interface in Java?
The JSONPointer is a standard that defines a string syntax that can be used to access a particular key value in the JSON document. An instance of JSONPointer can be created by calling the static factory method createPointer() on the Json class. In the JSONPointer, every string syntax is prefixed with “/”. We can get the value of a key by calling the getValue() method on the JsonPointer object.JSON fileExampleimport javax.json.*; import java.io.*; public class JsonPointerTest { public static void main(String[] args) throws Exception { JsonReader jsonReader = Json.createReader(new FileReader("simple.json")); ...
Read MoreImportance of the JsonPatch interface in Java?
The JsonPatch interface is a format for storing a sequence of operations that can be applied to the target JSON structure. There are few operations like add, remove, replace, copy, move and test can be stored in JsonPath and operated on JSON structure. The JsonPatchBuilder interface can be used for constructing a JSON patch using the Json.createPatchBuilder().JSON fileExampleimport java.io.*; import javax.json.Json; import javax.json.JsonPatch; import javax.json.JsonPatchBuilder; import javax.json.JsonReader; import javax.json.JsonStructure; public class JsonPatchTest { public static void main(String[] args) throws Exception { JsonPatchBuilder jsonPatchBuilder = Json.createPatchBuilder(); JsonPatch jsonPatch = jsonPatchBuilder.add("/postalCode", "500072").remove("/age").build(); JsonReader reader = Json.createReader(new FileReader("simple.json")); ...
Read MoreHow to disable back button in android while logging out the application?
This example demonstrates how do I disable back button in android while logging out the application.Step 1 − Create a new project in Android Studio, go to File rArr; 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.os.Bundle; import android.widget.Toast; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } @Override public void onBackPressed() { ...
Read MoreHow to disable Mobile Data on Android?
This example demonstrates how do I disable Mobile data in Android.For your find Information, unless you have a rooted phone I don't think you can enable and disable data programmatically because in order to do so we have to include MODIFY_PHONE_STATE permission which is only given to system or signature apps.setMobileDataEnabled() method is no longer callable via reflection. It was callable since Android 2.1 (API 7) to Android 4.4 (API 19) via reflection, but as of Android 5.0 and later, even with the rooted phones, the setMobileDataEnabled() method is not callable.Step 1 − Create a new project in Android Studio, ...
Read MoreHow do we set the input type for an Android EditText programatically?
This example demonstrates how do I set the input type for an Android EditText programmatically.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.os.Bundle; import android.text.InputType; import android.view.View; 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); ...
Read MoreHow to convert a color integer to a hex String in Android?
This example demonstrates how do I 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.os.Bundle; import android.widget.TextView; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); TextView textView = findViewById(R.id.textView); int intColor = -16895234; String hexColor = ...
Read MoreHow to load files from asset directory into WebView in Android?
This example demonstrates how do I load files from asset directory into WebView 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.os.Bundle; import android.webkit.WebView; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); WebView webView = findViewById(R.id.webView); webView.loadUrl("file:///android_asset/mytext.html"); ...
Read MoreHow to create a JSON using JsonObjectBuilder and JsonArrayBuilder in Java?
The JsonObjectBuilder can be used for creating JsonObject models whereas the JsonArrayBuilder can be used for creating JsonArray models. The JsonObjectBuilder can be created using the Json class, it contains methods to create the builder object and build an empty JsonObject instance using the Json.createObjectBuilder().build(). The JsonArrayBuilder can be created using the Json class, it contains methods to create the builder object and build an empty JsonArray instance using Json.createArrayBuilder().build().Exampleimport java.io.*; import javax.json.*; public class JsonObjectTest { public static void main(String[] args) { JsonObject empObject = Json.createObjectBuilder().add("empName", "Jai") ...
Read MoreHow do I hide and show a menu item in the Android ActionBar?
This example demonstrates how do I hide and show a menu item in the Android ActionBar.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.os.Bundle; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.widget.CompoundButton; import android.widget.ToggleButton; public class MainActivity extends AppCompatActivity { ToggleButton button1; Menu myMenu; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ...
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