Android Studio How To Create A New Activity

Pre-requisites:

Android App Development Fundamentals for Beginners
Guide to Install and Set up Android Studio
Android | Starting with first app/android project
Android | Running your first Android app

This article aims to tell and show about how to "Send the data from one activity to second activity using Intent". In this Example, we have two activities, activity_first which is the source activity and activity_second which is the destination activity. We can send the data using putExtra() method from one activity and get the data from the second activity using getStringExtra() methods.

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Example:

In this Example, one EditText is used to input the text. This text is sent to the second activity when the "Send" button is clicked. For this, Intent will start and the following methods will run:

putExtra() method is used for send the data, data in key value pair key is variable name and value can be Int, String, Float etc.
getStringExtra() method is for getting the data(key) which is send by above method. according the data type of value there are other methods like getIntExtra(), getFloatExtra()

How to create an Android App to send and receive the data between two activity

Step 1: Firstly create a new Android Application. This will create an XML file and a Java File. Please refer the pre-requisites to learn more about this step.

Step 2: Open "activity_first_activity.xml" file and add the following widgets in a Relative Layout:

A EditText to Input the message
A Button to send the data

Also, Assign the ID to each component along with other attributes as shown in the image and the code below. The assigned ID on a component helps that component to be easily found and used in the Java files.

Syntax:

android:id="@+id/id_name"

Here the given IDs are as follows:

Send Button: send_button_id
input EditText: send_text_id

This will make the UI of the Application.

Step 3: Now, after the UI, this step will create the Backend of the App. For this, open the "first_activity.java" file and instantiate the components made in the XML file (EditText, send Button) using findViewById() method. This method binds the created object to the UI Components with the help of the assigned ID.

General Syntax:

ComponentType object = (ComponentType)findViewById(R.id.IdOfTheComponent);

Syntax for components used:

Button send_button= (Button)findViewById(R.id.send_button_id);
send_text = (EditText) findViewById(R.id.send_text_id);

Step 4: This step involves setting up the operations on the sending and received the data. These operations are as follows:

1. first Add the listener on the send button and this button will send the data. This is done as follows:

send_button.setOnClickListener(new View.OnClickListener() {}

after clicked this button following operation will be performed.

2. Now create the String type variable for store the value of EditText which is input by user. Get the value and convert it to string. This is done as follows:

String str = send_text.getText().toString();

3. Now create the Intent object First_activity.java class to Second_activity class. This is done as follows:

Intent intent = new Intent(getApplicationContext(), Second_activity.class);

where getApplicationContext() will fetch the current activity.

4. Put the value in putExtra method in key value pair then start the activity. This is done as follows:

intent.putExtra("message_key", str);
startActivity(intent);

where "str" is the string value and the key is "message_key" this key will use to get the str value

Step 5: Now we have to create a Second_Activity to receive the data.
The steps to create the second activity is as follows:

android project > File > new > Activity > Empty Activity

Step 6: Now open your second xml file.
Add TextView for display the receive messages. assign ID to Textview. Second Activity is shown below:

Step 7: Now, open up your second activity java file and perform the following operation.

1. Define the TextView variable, use findViewById() to get the TextView as shown above.

receiver_msg = (TextView) findViewById(R.id.received_value_id);

2. Now In second_activity.java file create the object of getTntent to receive the value in String type variable by getStringExtra method using message_key.

Intent intent = getIntent();
String str = intent.getStringExtra("message_key");

3. The received value set in the TextView object of the second activity xml file

receiver_msg.setText(str);

Step 8: Now Run the app and operate as follows:

When the app is opened, it displays a "Input" EditText. Enter the value for the send.
click the send button then message will display on second screen.

Below is the complete code for the Application.

Filename: activity_first_activity.xml

XML

<? xml version = "1.0" encoding = "utf-8" ?>

< RelativeLayout

android:layout_width = "match_parent"

android:layout_height = "match_parent"

tools:context = ".first_activity" >

< EditText

android:id = "@+id/send_text_id"

android:layout_width = "300dp"

android:layout_height = "wrap_content"

android:textSize = "25dp"

android:hint = "Input"

android:textStyle = "bold"

android:layout_marginTop = "20dp"

android:layout_marginLeft = "40dp" />

< Button

android:id = "@+id/send_button_id"

android:layout_width = "wrap_content"

android:layout_height = "40dp"

android:text = "send"

android:textStyle = "bold"

android:layout_marginTop = "150dp"

android:layout_marginLeft = "150dp" />

</ RelativeLayout >

Filename: First_Activity.java

Java

package org.geeksforgeeks.navedmalik.sendthedata;

import android.content.Intent;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

public class first_activity extends AppCompatActivity {

Button send_button;

EditText send_text;

@Override

protected void onCreate(Bundle savedInstanceState)

{

super .onCreate(savedInstanceState);

setContentView(R.layout.activity_first_activity);

send_button = (Button)findViewById(R.id.send_button_id);

send_text = (EditText)findViewById(R.id.send_text_id);

send_button.setOnClickListener( new View.OnClickListener() {

@Override

public void onClick(View v)

{

String str = send_text.getText().toString();

Intent intent = new Intent(getApplicationContext(), Second_activity. class );

intent.putExtra( "message_key" , str);

startActivity(intent);

}

});

}

Filename: activity_second_activity.xml

XML

<? xml version = "1.0" encoding = "utf-8" ?>

android:layout_width = "match_parent"

android:layout_height = "match_parent"

tools:context = "org.geeksforgeeks.navedmalik.sendthedata.Second_activity" >

< TextView

android:id = "@+id/received_value_id"

android:layout_width = "300dp"

android:layout_height = "50dp"

android:textStyle = "bold"

android:textSize = "40dp"

android:layout_marginTop = "20dp"

android:layout_marginLeft = "40dp" />

</ RelativeLayout >

Filename: Second_Activity.java

Java

package org.geeksforgeeks.navedmalik.sendthedata;

import android.content.Intent;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.widget.TextView;

public class Second_activity extends AppCompatActivity {

TextView receiver_msg;

@Override

protected void onCreate(Bundle savedInstanceState)

{

super .onCreate(savedInstanceState);

setContentView(R.layout.activity_second_activity);

receiver_msg = (TextView)findViewById(R.id.received_value_id);

Intent intent = getIntent();

String str = intent.getStringExtra( "message_key" );

receiver_msg.setText(str);

}

Output: