Pass Array in Android Studio 2023: Practical Tips for Perfect Implementation

Let’s explain how to pass array of person from one activity to another through a Bundle in Java.
In Android development, it is often necessary to pass data between different components of an application. One of the most common scenarios is passing data from one activity to another. In Java, the Bundle class is used to pass data between activities. A Bundle is essentially a key-value pair container that holds the data to be passed. In this tutorial, we will learn how to pass an array of Person objects from one activity to another using a Bundle.

Step 1: Create a new Android project:

Step 2: Create the Person class:

public class Person
{
    private String name;
    private int age;
    private String gender;
    public Person(String name, int age, String gender)
    {
        this.name = name;
        this.age = age;
        this.gender = gender;
    }
    public String getName()
    {
        return name;
    }
    public int getAge()
    {
        return age;
    }
    public String getGender()
    {
        return gender;
    }
}

In this code, we have defined a Person class with three attributes: name, age, and gender. We have also created a constructor to set the values of these attributes when a new Person object is created. Additionally, we have created getter methods for each attribute.

Step 3: Create the MainActivity:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Next"
        android:layout_marginLeft="21dp"
        android:layout_marginBottom="11dp"
        android:id="@+id/btnNext"/>
</LinearLayout>

package com.panrum.passingbundle;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity
{
    private Button button;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = findViewById(R.id.btnNext);
        button.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                Intent intent = new Intent(MainActivity.this, SecondActivity.class);
                // Create an array of Person objects
                Person[] persons = new Person[]
                        {
                                new Person("John", 25, "Male"),
                                new Person("Jane", 23, "Female"),
                                new Person("Bob", 30, "Male") };
                // Create a Bundle to hold the array of Person objects
                Bundle bundle = new Bundle();
                bundle.putSerializable("persons", persons);
                // Add the Bundle to the
                 intent.putExtras(bundle);
                startActivity(intent);
            }
        });
    }
}

Step 4: Create the SecondActivity:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    tools:context=".SecondActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="name"
        android:id="@+id/stdName"
        android:textStyle="bold"
        android:textSize="32sp"/>
</LinearLayout>

package com.panrum.passingbundle;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.TextView;

public class SecondActivity extends AppCompatActivity
{
    private TextView textView;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        textView = findViewById(R.id.stdName);
        // Get the Bundle that was passed from the MainActivity
         Bundle bundle = getIntent().getExtras();
         if (bundle != null)
         {
             // Get the array of Person objects from the
             Person[] persons = (Person[])
                     bundle.getSerializable("persons");
              // Display the array of Person objects in the TextView
              StringBuilder sb = new StringBuilder();
              for (Person person : persons)
              {
                  sb.append(person.getName()).append(", ").append(person.getAge()) .append(", ").append(person.getGender()).append("\n");
              }
              textView.setText(sb.toString());
         }
    }
}

Related Links

A Splash Screen is a graphical element that is displayed when an Android application is launched. It typically shows the app’s logo or branding and is usually displayed for a few seconds before the main activity of the app is displayed.

Animations is a powerful tool for creating engaging and dynamic visuals that capture the attention of viewers. By creating the illusion of motion and change through a sequence of images, animation brings a sense of life and movement to static objects. This technique is commonly used in movies, TV shows, video games, and other forms of media to tell stories and convey ideas in a visually compelling way.

Custom animation in Android refers to the ability to create and define animations that are unique and customized to specific needs and requirements. This means that instead of using the built-in animation effects provided by Android, developers can create their own animations that are tailored to their app’s user interface and brand.

ListView and Spinner are two commonly used UI widgets in Android Studio that help to display data to the users in a user-friendly manner. A ListView is a view group that displays a list of scrollable items in a vertical list while a Spinner is a dropdown list that allows the user to select one option from a list of options.Â

Conclusion:

More Links

Data Sync-This tutorial aims to elucidate the process of passing an array as both an argument to a method and as a return value within Java. Accompanied by examples, this guide delves into the mechanics of these operations.

Passing Arrays in Intent.This example illustrates the process of transmitting an ArrayList to another activity using intents in the Android platform.

Data Migration-Functions serve the purpose of breaking down extensive code into smaller, more comprehensible segments. This approach enhances code clarity and diminishes overall complexity.

Transferring arrays between activities in Android via Intent and Bundle.