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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to get file URI reference in Java?
The class named File of the java.io package represents a file or directory (path names) in the system. This class provides various methods to perform various operations on files/directories.In general, an URI (Uniform Resource Identifier) represents a resource. The URI class of Java represents this format You can get the URI format of a file by invoking the toURI() method.ExampleFollowing Java example, prints the URI format of the file named samplefile.txtimport java.io.File; import java.io.IOException; import java.net.URI; public class GetURI { public static void main(String args[]) throws IOException { //Instantiating the File class String ...
Read MoreAsymptotic Complexity
Asymptotic AnalysisUsing asymptotic analysis, we can get an idea about the performance of the algorithm based on the input size. We should not calculate the exact running time, but we should find the relation between the running time and the input size. We should follow the running time when the size of input is increased.For the space complexity, our goal is to get the relation or function that how much space in the main memory is occupied to complete the algorithm.Asymptotic BehaviorFor a function f(n) the asymptotic behavior is the growth of f(n) as n gets large. Small input values ...
Read MoreHow to integrate Emojis Keyboard in an Android app?
This example demonstrates how do I integrate emogis keyboard in android appStep 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.util.Log; import android.view.View; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.ImageView; import hani.momanii.supernova_emoji_library.Actions.EmojIconActions; import hani.momanii.supernova_emoji_library.Helper.EmojiconEditText; import hani.momanii.supernova_emoji_library.Helper.EmojiconTextView; public class MainActivity extends AppCompatActivity { CheckBox mCheckBox; EmojiconEditText emojiconEditText, emojiconEditText2; ...
Read MoreHow to change font color of textView in android?
This example demonstrates how do I change font color of TextView 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.Color; import android.support.v7.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 textView1 = findViewById(R.id.textView1); textView1.setTextColor(Color.BLUE); ...
Read MoreHow to change the font size of textView in android?
This example demonstrates how do I change the font size of TextView 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; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } }Step 4 − Add the following code to androidManifest.xml ...
Read MoreHow to change font Family of textView In Android?
This example demonstrates how do I change the font family of textView 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.
Read MoreHow to send an email with a file attachment in Android?
This example demonstrates how do I send an email with a file attachment 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.content.Intent; import android.net.Uri; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends Activity { EditText etEmail; ...
Read MoreHow to make a specific text on TextView bold in Android?
This example demonstrates how do I make a specific text on TextView bold 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.Typeface; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.text.SpannableString; import android.text.Spanned; import android.text.style.StyleSpan; 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); ...
Read MoreHow can I generate random number in a given range in Android?
This example demonstrates how do I generate random number in a given range 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 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.Button; import android.widget.EditText; import android.widget.TextView; import java.util.Random; public class MainActivity extends AppCompatActivity { EditText et_min, et_max; Button btn_generate; TextView tv_output; Random r; int ...
Read MoreHow to detect user pressing Home Key in an Activity on Android?
This example demonstrates how do I detect user pressing home key in an activity 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 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.TextView; import android.widget.Toast; public class MainActivity extends AppCompatActivity { TextView textView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView = ...
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