Navigation Between Activities in Android using Kotlin and Java

How to navigate from one activity to another activity in android. ? We will learn this using Java and Kotlin in this article. 

Create a Project

Lets start by creating a new project choose your language as whether java or kotlin. we will discuss both here. 

Create Activities

As the MainActivity will be create by default, we need to create one more activity called “secondActivity.xml”.We are creating only a button named “Next”, on the button click we want to configure the navigation to the second activity.

activity_main.xml

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

   <Button
        android:id="@+id/btnNext"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/next_activity"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="21dp"
        android:layout_below="@id/editTExt"/>

</RelativeLayout>

second_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:gravity="center"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/tv01"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        android:textSize="35sp"/>



</RelativeLayout>

Create Class files

This time we need to create one more class files for “second_activity.xml” called “SecondActivity.java” or “SecondActivity.kt” based on the programming language you have chosen on previous steps. Coding is doing only on the button click in the MainActivity class file only. Here we are explaining for both kotlin and java. let’s start from kotlin.

MainActivity.kt – find below code if you are using Kotlin as the language

package com.zayantech.demoappkotlin

import android.annotation.SuppressLint
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.EditText

class MainActivity : AppCompatActivity() {
    @SuppressLint("MissingInflatedId")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val editText = findViewById<EditText>(R.id.editTExt)
        val btnNext = findViewById<Button>(R.id.btnNext)

        btnNext.setOnClickListener {
            val intent = Intent(this,SecondActivity::class.java)          
            startActivity(intent)


        }



    }
}

MainActivity.java - if you using java as your programming language.

package com.zayantech.demoappjava;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

    Button btnNext;
    EditText editText;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btnNext = findViewById(R.id.btnNext);
        editText = findViewById(R.id.editTExt);

        btnNext.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Intent i = new Intent(MainActivity.this, SecondActivity.class);
                startActivity(i);


            }
        });

    }
}

Add Acitivity in AndroidManifiest

As we added one activity (second activity), it is mandatory to add the activity in AndroidManifest file.

change your manifest files by adding the below piece of code just before </application> table closing. 

<activity android:name=".SecondActivity"/>

Run the Project

As we have done all the steps which required for the navigation between activities, this is the time to test the project and enjoy. Hope you like it.