The Complete Android & Java Developer Course

Explore how Java, a compiled language, turns a source file into bytecode. Run it on any device with a Java virtual machine.

Discover how variables in Java act as buckets to store data, using the String type, and learn to declare, assign, and print strings like Paolo and my apple.

Define string and integer variables, then practice concatenation to assemble sentences, while using comments to disable code and observe outputs in the logs.

Explore how Java variable types size and capacity influence memory and efficiency, from bytes, shorts, and chars to floats, doubles, strings, and learn to match values to the correct type.

Master booleans as true or false, create boolean variables in Java, and apply them in decision making, while getting an intro to Java's basic types such as integers and chars.

Explore how if statements drive conditional programming and decision making in Java, using relational operators to compare variables, test conditions, and control code with if else blocks.

Master basic Java operations—addition, subtraction, multiplication, division, and remainder—using variables and integers or doubles. See how to fix concatenation with parentheses and set up a main method project.

Explore how to use logical and relational operators in Java to craft complex if statements, including and, or, not, and boolean expressions.

Learn how to use for and while loops to repeat actions, initialize a counter, test a condition, and increment to print sequences. Explore remainders to identify multiples.

Discover how methods in Java group enclosed statements, accept parameters, and return values, enabling modular, reusable code by calling methods from main and printing results.

Learn how Java methods declare return types from void to integer, string, and char, and how to return values using proper signatures and parameters.

Treat a class as a blueprint for objects in object-oriented programming, define properties and methods, then instantiate objects with new and access them via dot notation.

Learn to control access to instance variables with public and private modifiers to protect data and maintain encapsulation as a true black box.

Learn to encapsulate a ball class by using public and private access modifiers, implement constructors to set properties, and expose color and name through dedicated methods.

Explore the protected access modifier, showing that it allows access within the same package and by derived classes, as part of completing the public, private, and protected access controls.

Learn how to encapsulate data in Java by using private fields, public getters and setters, and overloaded constructors to create flexible, well-structured objects like a ball.

Learn how constructors initialize objects and how overloading creates multiple constructors with different signatures and parameters, including a default constructor, to instantiate a ball in various ways.

Discover how inheritance in Java enables child classes to reuse properties and behaviors from a parent class, using extends to build specific animals and ball types like basketball.

Explore how a child class extends a parent class through inheritance, adding unique properties like NBA and capacity, and override behaviors such as bounce.

Explore the java class library and object-oriented fundamentals, learn to read the java docs, import packages such as java.io and java.lang, and use StringBuilder to append, delete, and manipulate strings.

Explore arrays as typed containers with indexed elements, learn zero-based indexing, enforce same-type elements, create int and string arrays in Java, and loop through them with for loops using length.

Learn to create fixed and flexible arrays in Java, using new array constructors with a specified capacity, assign values by index, and handle length contracts to avoid out-of-bounds errors.

Explore array lists in Java, a flexible extension of arrays, and learn to create, add, access, and iterate elements like pig, cow, and parrot, noting size versus length.

Learn how to manipulate array lists in Java: remove by index, remove by object, add at index, check size, use contains, and clear the list with simple, flexible operations.

Explore hash maps in Java by building a key-value dictionary, adding items with put, retrieving with get, and removing entries, then iterating with entrySet and iterators to process pairs.

Specify hash map types to enforce integer keys and string values, using Integer objects for keys and avoiding primitives, then explore put operations and iteration while researching Java class library.

Set up Android Studio, create a new project named first look, configure minimum SDK 18, choose an empty activity, and run the app on a Nexus 5 emulator with Marshmallow.

Understand Android platform architecture as a Linux-based software stack, from system applications and the Java API framework to native libraries and the Linux kernel.

Explore Android Studio interface, run and debug apps on the emulator, and understand Android file structure: manifests, Java main activity, resources, layouts, and values such as colors and strings.

Learn how android apps structure user interface, logic, and resources with xml layouts and constraint layout to adapt across devices, using drag-and-drop widgets and design or text mode editing.

Explore Android Studio's user interface properties panel to adjust text and background colors with color pickers and hex codes, then edit the XML to understand constraint layout structure.

Learn how the R.java resource file connects layouts and code, access views with findViewById, and manipulate button properties and layout content in Android Studio.

This lecture explains strings.xml in the android values folder, how to define string resources and access them by id, and why hard coding text is avoided for updates and localization.

Explore how the manifest.xml defines app structure, sets properties like allow backup and launcher icon, and declares activities and permissions (internet, maps, GPS, calls).

Learn to build a small Android app by wiring a button to a text view, updating the button label from strings, and manipulating visibility with findViewById and private widget fields.

Explore how to trigger a text view update from a button using two approaches: a click method in the activity and, preferably, a setOnClickListener that updates the text.

Build a simple name input app using the edit text widget in Android, set a hint, retrieve input on button click, and display the entered name in the text view.

Create a new Android project for a meters-to-inches converter app, add image, input, convert button, and result view; run the UI and await the Java code.

Wire up the edit text and result view, implement meter-to-inch conversion using 39.3701, parse input as double, multiply, and display the result in the result view.

Format results to two decimals with string format for the meters to inches app. Restrict input to numbers and decimals; show 'Please enter a valid number'.

Build the Try me app in an Android Java project with a center button that changes the background to a random color on each tap, using view references.

connect the try me button via find view by id, attach an on click listener, and log actions as the background changes to a random color from a color array.

Learn how to implement Android radio buttons within a radio group, configure IDs and text via XML, and preview behavior as only one option can be selected.

Connect the radio group and radio buttons in the main activity, implement an on checked change listener, switch on the checked id, and log the selected option.

Learn to implement an Android seekbar with a max of 10, update a pain level text from 0 to 10 in real time, and change its color at 7.

Implement an Android toggle button that switches between on and off states, and build a hide and seek app that reveals text via the toggle state.

Explore how to implement checkboxes in an Android app, manage two states, and update a text view to reflect user selections using resource strings and IDs.

Learn how to implement and manage checkboxes in android, handle a show button click, and display their states in a text view using a string builder.

Learn to create and display alert dialogs in Android using alert dialog builder, set title and message from resources, and handle yes or no actions with click listeners.

Create an Android tip calculator app by entering the amount, adjusting a seek bar for the tip percentage, and tapping to calculate the total.

Wire up a tip calculator UI in the main activity, allowing bill entry, a seek bar for tip percent, and a calculate button, with the result updating live.

Open the main activity, capture the seek bar percentage and entered bill as a float, then calculate and display the tip and total bill, with a toast for missing input.

Explore the Android context as an abstract, system-provided class with implementations like activity and application, and learn to use it to access resources, strings, and application context for toast messages.

Explore the Android log class for debugging by printing messages at different levels (debug, error, verbose) with tags to identify sources, and learn to clean logs before release.

Learn the fundamentals of debugging Android apps by using breakpoints, console logs, and the Android monitor to inspect variables and step through the calculate flow in main activity.

Understand how an activity represents a screen in Android, with a main activity extending AppCompatActivity, overriding onCreate, restoring savedInstanceState, and setting the layout with setContentView. Explore lifecycle.

Explore the Android activity lifecycle by implementing onCreate, onStart, onPostResume, onPause, onStop, and onDestroy, with toast messages showing each state.

Create a two-activity Android app by wiring a button on the first screen to launch the second activity using an intent and startActivity.

Attach messages from one activity to another using intents and extras. Retrieve strings and integers in the second activity via keys and display them.

Learn to pass data back to the first activity from the second using startActivityForResult, onActivityResult, setResult, requestCode, and data intents, and display the received data with a toast.

Build a pet bio app with cat and dog images on the main screen, use a single on-click listener for both views, and pass data to a detail screen.

Discover how to create a dynamic second screen in an Android app with a single bio activity that shows cat or dog details using intent extras, image, name, and bio.

Develop a dynamic pet bio app in Android that displays a dog or cat based on intent extras, loading the appropriate image from drawable and the bio text.

Discover how RecyclerView replaces the traditional list view to efficiently display large data sets, optimize memory, and enable smooth scrolling with card views.

Set up a first RecyclerView by adding the library, create a list_row layout with a card view and title and description text views, and wire data with an adapter.

Explore the mvc pattern in Android apps and organize code into adapter, model, and utilities. Build a recycler view with a list item model, view holder, and title description binding.

Inflate the list row layout, create and bind the ViewHolder for each list item, and wire the adapter to a RecyclerView with a layout manager.

Learn to implement a RecyclerView with a model, adapter, and view holder, add items with rating fields, consolidate padding in the linear layout, and prepare clickable items for details.

Attach an event listener to each row in the recycler view, obtain the adapter position, fetch the item, and display its name in a toast.

Tap a row to open a details activity in Android, using an adapter and intent extras to pass name, description, and rating from the list to the details screen.