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Java provides a two classes namely, DeflaterOutputStream and InflaterInputStream for compressing and uncompressing data.Compressing a Single fileTo compress a single file −Create a FileInputStream object, by passing the path of the file to be compressed in String format, as a parameter to its constructor.Create a FileOutputStream object, by passing the path of the output file, in String format, as a parameter to its constructor.Create a DeflaterOutputStream object, by passing the above created FileOutputStream object, as a parameter to its constructor.Then, read the contents of the input file and write using the write() method of the DeflaterOutputStream class.Exampleimport java.io.FileOutputStream; import java.io.IOException; ... Read More
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.To get the list of all the existing files in a directory this class provides five different methods to get the details of all files in a particular folder −String[] list()File[] listFiles()String[] list(FilenameFilter filter)File[] listFiles(FilenameFilter filter)File[] listFiles(FileFilter filter)Among these, the String[] list(FilenameFilter filter) method returns a String array containing the names of all the files and directories in the path represented by the current (File) object. But the retuned array contains the filenames ... Read More
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 More
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 More
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 More
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 More
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.
This example demonstrates how do I click camera programmatically 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.Manifest; import android.content.ContentValues; import android.content.Intent; import android.content.pm.PackageManager; import android.net.Uri; import android.os.Build; import android.provider.MediaStore; import android.support.annotation.NonNull; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.Toast; public class MainActivity extends AppCompatActivity { private static final int PERMISSION_CODE = ... Read More
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 More
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 More