How to pass data from one activity to another in android studio

by taimoor | Dec 3, 2019 | Android, Android for Beginners, Basics | 0 comments

Pass data from one activity to another activity in android studio

In this tutorial we will learn 2 basic things.Pass data between activities and add a back arrow. There are multiple ways to pass data between activities in android studio. Today we will use the easiest way to pass data from one activity to another. We will also add add a back arrow in Android studio. So we simply need 2 activities for this example and 3 to 4 lines of code to send and receive data.

So let’s get started.

What we will learn in this tutorial and How to:

Add a Back arrow in app-bar
Create New Activity in Android Studio
Call Another Activity in Android Studio
Pass data between two activities in Android Studio
Only enable digits to be entered in Edit Text field
Call Button’s onClick() Listener in Android Studio
and much more…

Steps to pass data between activities

Create or Open Android Studio Project
Add EditText fields in 1st activity to get user data
Create another receiving Activity
Pass data from 1st activity onClick() of button using Intent
Receive data using Intent in 2nd activity and show on screen

Create or open Android Studio Project

Design The XML of First Activity

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:padding="20dp"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/nameET"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Name" />
    <EditText
        android:id="@+id/numberET"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/nameET"
        android:layout_marginTop="10dp"
        android:hint="Name"
        android:inputType="number" />

    <Button
        android:id="@+id/btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/numberET"
        android:layout_marginTop="30dp"
        android:text="Send Data" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="First Activity!" />
</RelativeLayout>

Code MainActivity.Java to send data

public class MainActivity extends AppCompatActivity {
    EditText name, number;
    Button btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //Hooks 
        name = findViewById(R.id.nameET);
        number = findViewById(R.id.numberET);
        btn = findViewById(R.id.btn);
        //Pass Data on Button Click 
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //Get data from input field 
                String getName = name.getText().toString();
                String getNumber = number.getText().toString();
                //Pass data to 2nd activity 
                Intent intent = new Intent(MainActivity.this, SecondActivity.class);
                intent.putExtra("name", getName);
                intent.putExtra("number", getNumber);
                startActivity(intent);
            }
        });
    }
}

Design the 2nd XML layout to show received data

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:padding="20dp"
    tools:context=".SecondActivity">
    <TextView
        android:id="@+id/set_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Name"
        android:textSize="24sp" />
    <TextView
        android:id="@+id/set_number"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/set_name"
        android:layout_marginTop="10dp"
        android:text="123"
        android:textSize="24sp" />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="Second Activity"
        android:textSize="24sp" />
</RelativeLayout>

Code in the 2nd Java to get data

public class SecondActivity extends AppCompatActivity {
    TextView name, number;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        //Hooks 
        name = findViewById(R.id.set_name);
        number = findViewById(R.id.set_number);
        //Get text from Intent 
        Intent intent = getIntent();
        String getName = intent.getStringExtra("name");
        String getNumber = intent.getStringExtra("number");
        //Set Text 
        name.setText(getName);
        number.setText(getNumber);
    }
}

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