How to switch between pages (activities) in Android

What if you have multiple activities in your Android app and how do you switch/navigate between those activities?

Well here is an example of Android project, and it has two activities, each one of those activities has button to navigate and start another activity. The button in first activity calls second activity to run and the button on that second activity will close it so you can go back to first activity.

AndroidManifest.xml

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

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

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".Two"></activity>
    </application>

</manifest>

activity_one.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.zofiakreasi.switchbetweenpages.One">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Activity One"
        android:id="@+id/textView2"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Go to Two"
        android:id="@+id/gtt"
        android:layout_below="@+id/textView2"
        android:layout_centerHorizontal="true" />
</RelativeLayout>

One.java

package com.zofiakreasi.switchbetweenpages;

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

public class One extends AppCompatActivity {

    Button gtt;

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

        gtt = (Button) findViewById(R.id.gtt);
        gtt.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view){
                launchTwo();
            }
        });

    }

    private void launchTwo(){
        Intent intent = new Intent(this, Two.class);
        startActivity(intent);
    }
}

activity_two.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.zofiakreasi.switchbetweenpages.Two">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Activity Two"
        android:id="@+id/textView"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Go to One"
        android:id="@+id/gto"
        android:layout_below="@+id/textView"
        android:layout_centerHorizontal="true" />
</RelativeLayout>

Two.java

package com.zofiakreasi.switchbetweenpages;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class Two extends AppCompatActivity {

    Button bto;

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

        bto = (Button) findViewById(R.id.gto);
        bto.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view){
                finish();
            }
        });

    }
}