Activity Lifecycle & Tracing Lifecycle Events with Logcat.

Introduction

The purpose of this is app to show lifecycle events of the activity and i have trace it down in the logcat command-line tool window using LogCat syntax with each event.

Activity Lifecycle.

Here are the main states that an activity can be in, Activity States :-

• Resumed : top of the stack, visible & interactive.
• Paused : can be visible but without focus.
• Stopped : not visible.
• Inactive : completely removed from the activity stack.

Here are the different states that the activity can be in, As an activity enters each state, a callback method will be called by the framework and in this area when can add cutsomization and the behavior of our application.

Trace Lifecycle event with Logcat.

There are seven methods that manage the life cycle of an Android application :

• onCreate()
• onStart()
• onResume()
• onRestart()
• onPause()
• onStop()
• onDestroy()

We can trace them all with the Logcat info syntax : Log.i(TRACE_EVENTS,"onResume");

Getting Started.

1. Download the code.
2. Open Code in Android Studio.
3. Run the app on emulator.
4. Open Logcat command line tool window.

Thank You.