Activities in Android

 What is an Activity in Android?

• An Activity is a single screen with a user interface in an Android app.
• It is like a window in a desktop app, but full-screen on mobile.
• Activities let users interact with your app.
• Each Activity handles its own UI and logic.

Key Features of Activity

• Represents one screen of the app.
• Manages UI components (like buttons, text fields).
• Handles user interaction.
• Works with intents to navigate to other activities.
• Has a lifecycle (created, started, resumed, paused, stopped, destroyed).

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Activity Lifecycle

Android manages Activity states:

• onCreate():Called when Activity is created. Initialize UI.
• onStart():Activity becomes visible.
• onResume():Activity is in foreground, ready for user.
• onPause():Another Activity comes in front.
• onStop():Activity no longer visible.
• onDestroy():Activity is removed from memory.

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Intent

Activities use Intents to start other Activities.

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

Activity Initializing with Binding
at build.gradle.kts(Module:app)
android {
    //
    buildFeatures {
        viewBinding = true
    }

}

Activity with binding:-
package com.app.shortnewstestuser.ui.activity

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import com.app.shortnewstestuser.databinding.ActivityMainBinding


class MainActivity : AppCompatActivity() {
    private lateinit var binding: ActivityMainBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)


        // 

    }

}