Tutorial how to create second activity in Android Studio

Create second activity and connect it with main activity with a button click and and vice versa in Android Studio version 3.1.3. Create new project with Application name: Start Another Activity; Minimum SDK: API 21 – Android 5.0 (Lollipop). In app->java->MainActivity.java write the code:

package com.app.toyo.startanotheractivity;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        View v = findViewById(R.id.button1);
        v.setOnClickListener(this);
    }

    @Override
    public void onClick(View arg0) {
        if (arg0.getId() == R.id.button1) {
            //define a new Intent for the second Activity
            Intent intent = new Intent(this, SecondActivity.class);

            //start the second Activity
            this.startActivity(intent);
        }
    }
}

In app->res->layout->activity_main.xml write the code:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 
    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:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button1"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

In app->java create New -> Java Class: SecondActivity.java and write the code:

package com.app.toyo.startanotheractivity;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;

public class SecondActivity extends AppCompatActivity implements View.OnClickListener {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        View v = findViewById(R.id.button2);
        v.setOnClickListener(this);

    }

    @Override
    public void onClick(View arg0) {
        if (arg0.getId() == R.id.button2) {
            //define a new Intent for the second Activity
            Intent intent = new Intent(this, MainActivity.class);

            //start the second Activity
            this.startActivity(intent);
        }
    }
}

In app->res->layout create New -> Layout resource file: activity_second.xml and write the code:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button2"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

In manifest->AndroidManifest.xml write the code:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.app.toyo.startanotheractivity">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.app.toyo.startanotheractivity.SecondActivity"
            android:label="Second Activity">
        </activity>
    </application>

</manifest>

In app->res->values->strings.xml write the code:

<resources>
    <string name="app_name">Start another activity</string>
    <string name="button1">CLICK</string>
    <string name="button2">BACK</string>
</resources>

Run app in mobile device or Emulator (API 21 – Android 5.0) and switch between main activity and second activity with buttons. Follow Video Tutorial:   Download project with Source Code from here: https://android-coffee.com/wp-content/uploads/projecs/Startanotheractivity.7z Please subscribe here to our YouTube channel. Thank you! Check next tutorials to learn all about Android. For further questions leave a message.