Mastering the Android Activity Lifecycle: A Hands-On Demo Guide

 

Android Activity Lifecycle: A Quick Overview

Every Activity transitions through states managed by these core methods:

onCreate(): Initializes UI and data.

onStart(): Activity becomes visible.

onResume(): User can interact (foreground).

onPause(): Activity loses focus (e.g., dialog opens).

onStop(): Activity is no longer visible.

onRestart(): Restarts after onStop().

onDestroy(): Final cleanup before termination.

XML File

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    android:padding="16dp">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="18sp"
        android:text="Lifecycle Events:\n"
        android:textStyle="bold" />

</LinearLayout>

JAVA File

package com.vipul.p6;

import android.os.Bundle;
import android.widget.TextView;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;

public class ActivityLifeCycle extends AppCompatActivity {

    private TextView textView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_life_cycle);
        textView = findViewById(R.id.textView);

    }
    @Override
    protected void onStart() {
        super.onStart();
        textView.setText("onStart");
    }

    @Override
    protected void onResume() {
        super.onResume();
        textView.setText("onResume");
    }

    @Override
    protected void onPause() {
        super.onPause();
        textView.setText("onPause");
    }

    @Override
    protected void onStop() {
        super.onStop();
        textView.setText("onStop");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        textView.setText("onDestroy");
    }

}

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