This example demonstrates how do I check if an android application is running in the background.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.app.ActivityManager; import android.os.Bundle; import android.widget.Toast; public class MainActivity extends AppCompatActivity {    Boolean appRunningBackground;    @Override    protected void onCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);       setContentView(R.layout.activity_main);       ActivityManager.RunningAppProcessInfo runningAppProcessInfo = new ... Read More

This example demonstrates how to do I auto scale TextView text to fit within the bounds 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.Add the following dependencies to build.gradle: Module: App)implementation 'com.android.support:design:28.0.0' implementation 'me.grantland:autofittextview:0.2.1'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; public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {     ... Read More

This example demonstrates how do I use the SQLite database with an android application.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 − Create a new Java class (DataBaseManager) and add the following code −import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.database.SQLException; import android.database.sqlite.SQLiteDatabase; public class DataBaseManager { private DatabaseHelper databaseHelper; private Context context; private SQLiteDatabase database; DataBaseManager(Context c) {    context = c;    } ... Read More

This example demonstrates how do I use SharedPreferences on Android to store, read, and edit values.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.Context; import android.content.SharedPreferences; import android.os.Bundle; import android.view.Menu; import android.view.View; import android.widget.EditText; import android.widget.Toast; public class MainActivity extends AppCompatActivity {    EditText editTextName, editTextEmail;    public static final ... Read More

This example demonstrates how do I get the android device's primary e-mail address.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.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity; import androidx.core.app.ActivityCompat; import androidx.core.content.ContextCompat; import android.Manifest; import android.accounts.Account; import android.accounts.AccountManager; import android.app.Activity; import android.content.pm.PackageManager; import android.os.Build; import android.os.Bundle; import android.util.Log; import android.util.Patterns; import android.widget.TextView; import android.widget.Toast; import java.util.regex.Pattern; public class MainActivity extends AppCompatActivity {    private Activity activity = ... Read More

This example demonstrates how do I set the Android permission on a folder/file on SD Card to be able to write to it.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 − Create two fragment layouts and add the following code as given below −FragmentOne.javaimport android.content.Context; import android.os.Bundle; import androidx.annotation.NonNull; import androidx.fragment.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.EditText; public class ... Read More

This example demonstrates how do I set the Android permission on a folder/file on SD Card to be able to write to it.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.os.Environment; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import java.io.BufferedReader; import java.io.DataInputStream; import ... Read More

This example demonstrates how do I show a dialog to confirm that the user wishes to exit an Android Activity.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.AlertDialog; import androidx.appcompat.app.AppCompatActivity; import android.content.DialogInterface; 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 ... Read More

This example demonstrates how do I detect swipe direction between left/right and up/down 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.Context; import android.os.Bundle; import android.view.GestureDetector; import android.view.MotionEvent; import android.view.View; import android.widget.Toast; public class MainActivity extends AppCompatActivity {    OnSwipeTouchListener onSwipeTouchListener;    @Override    protected void onCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);       setContentView(R.layout.activity_main);     ... Read More

This example demonstrates how do I set a Timeout for an AsyncTask 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.app.ProgressDialog; import android.os.AsyncTask; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; public class MainActivity extends AppCompatActivity {    Button button;    EditText editTextTime;    @Override    protected void onCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState); ... Read More