This example demonstrates how do I delete SharedPreferences data for my android app.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 res/strings.xml    Sample    player_name    country_name Step 4 − Add the following code to src/MainActivity.javaimport androidx.appcompat.app.AppCompatActivity; import android.content.Context; import android.content.SharedPreferences; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; public class MainActivity extends AppCompatActivity {    TextView textView, tvAfterDelete; ... Read More

This example demonstrates how do I read a simple text file in the android app.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Create a new Android Resource directory (raw.xml) and add a text file in the res/rawStep 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.View; import android.widget.TextView; import android.widget.Toast; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; public class MainActivity extends AppCompatActivity ... Read More

This example demonstrates how do I add calendar events 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; import android.view.View; import java.util.Calendar; public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);       setContentView(R.layout.activity_main);    }    public void AddCalendarEvent(View view) {       ... Read More

This example demonstrates how do I call an activity method from a fragment 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 androidx.fragment.app.FragmentManager; import androidx.fragment.app.FragmentTransaction; 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);       FragmentManager fragmentManager = getSupportFragmentManager();     ... Read More

This example demonstrates how do I iterate JSON Array 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; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; public class MainActivity extends AppCompatActivity {    TextView textView;    String strJson = "{ \"Employee\" :[{\"ID\":\"01\", \"Name\":\"Sam\", \"Salary\":\"50000\"}, "       + "{\"ID\":\"02\", \"Name\":\"Shankar\", \"Salary\":\"60000\"}] }";    @Override    protected void onCreate(Bundle ... Read More

This example demonstrates how do I validate an email address 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.view.View; import android.widget.EditText; import android.widget.Toast; public class MainActivity extends AppCompatActivity {    EditText editText;    String email;    String emailPattern = "[a-zA-Z0-9._-]+@[a-z]+\.+[a-z]+";    @Override    protected void onCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);       ... Read More

This example demonstrates how do I use RecyclerView inside NestedScrollView 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.Add the following dependency in the build.gradle (Module: app)implementation 'com.android.support:appcompat-v7:28.0.0' implementation 'com.android.support:design:28.0.0' implementation 'com.android.support:recyclerview-v7:28.0.0' implementation 'com.android.support:cardview-v7:28.0.0' implementation 'com.intuit.sdp:sdp-android:1.0.3'Step 2 − Add the following code to res/layout/activity_main.xml.                               Step 3 − Create a layout resource file (list_item.xml) and add the following code −       ... Read More

This example demonstrates how do I properly highlight the selected item on android RecyclerView.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 dependency in the build.gradle (Module: app)implementation 'com.android.support:recyclerview-v7:28.0.0'Step 2 − Add the following code to res/layout/activity_main.xml.     Step 3 − Create a layout resource file (list_layout.xml) and add the following code −             Step 4 − Create drawable resource files as mentioned below and add the respective codes −background_selector.xml −   ... Read More

This example demonstrates how do I use the recyclerview with a database 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.Add the following dependency in the build.gradle (Module: app)implementation 'com.android.support:recyclerview-v7:28.0.0' implementation 'com.android.support:cardview-v7:28.0.0' implementation 'com.android.support:design:28.0.0'Step 2 − Add the following code to res/layout/activity_main.xml.         Step 3 − Create layout resource files as mentioned below add the respective codes −add_contacts.xml −         contact_list_layout.xml −                     ... Read More

This example demonstrates how How to display the count of notifications in Android App launcher.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 androidx.core.app.NotificationCompat; import android.annotation.SuppressLint; import android.os.Bundle; import android.app.NotificationChannel ; import android.app.NotificationManager ; import android.app.PendingIntent ; import android.content.Intent ; import android.os.Bundle ; import android.view.View ; import static android.app.Notification. BADGE_ICON_SMALL ; public class MainActivity extends AppCompatActivity {    static ... Read More