Android Java Masterclass - Become an App Developer

Install Android Studio on Windows 64-bit by verifying system type and completing the guided setup, including HAXM considerations for Intel CPUs and memory guidance for smoother emulation.

Install Android Studio on Mac by downloading the latest version from developer.android.com, run the dmg, and configure the Android SDK and HAXM for fast emulation.

Install Android Studio on Linux, verify a 64-bit system, download from developer.android.com, run studio.sh, install the Android SDK, and enable KVM virtualization for emulator performance.

Configure android studio via the sdk manager, install api 29 platform and system images, ensure a space-free sdk path, and apply updates for emulators and google play images.

Configure Android Studio for productivity by using the stable channel, enabling auto import on the fly with optimize imports, showing line numbers and method separators, and adjusting code folding options.

Enable hardware virtualization in the BIOS to speed Android emulators and run HAXM; understand VT-x, AMD-V, and related settings, verify hardware support, and consider a physical device if needed.

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Kick off your first Android app by creating a project, then run it on an emulator (AVD) or real device. Explore Android Studio templates and their impact.

Create your first Android app in Android Studio by naming it Hello World and using a reverse domain package with Java. Set API 17 Jelly Bean as minimum SDK.

Explore Android Studio's layout editor, the activity_main layout, and the project panes to learn how ConstraintLayout, widgets, and TextView define the screen.

Learn to create and configure an Android emulator in Android Studio via the AVD manager, choosing a device (Nexus 5X), system image, GPU and HAXM settings for testing apps.

Learn to run your Hello World app on an Android emulator with Android Studio and AVD Manager, select devices, and review Logcat and ADB output.

Connect a real Android device, such as the Nexus 5x, to Android Studio for accurate testing by enabling developer options, USB debugging, and installing the necessary drivers.

Master constraint layout in Android Studio by using design and blue print views, applying left, top, right, and bottom constraints to anchor and resize widgets.

Learn how image scaling works in Android with ImageView scaleType options such as none, matrix, fitXY, fitStart, fitCenter, fitEnd, centerCrop, and centerInside. Understand how widget versus content positioning affects centering.

Learn to build cross-device Android layouts with constraint layouts, use dp and sp for scalable widgets and text, and test across devices from phones to wearables.

Learn to align bottom-right buttons using baseline constraints, link the two buttons, and manage text-based layout behavior to ensure consistent alignment in Android apps.

Constrain the edit text bottom to the top of the cancel button, set vertical sizing to fixed and then to match constraint, and set width to match constraint.

Learn how to implement horizontal and vertical scrolling in Android layouts by enabling scrollable edit texts, configuring scroll bars, and using constrained layouts with proper biases.

Learn to build your first interactive Android application by adding a button, a text view, and a menu, using constraint-based layouts with margins and anchors.

Add the text view below the plain text widget, apply left and right constraints with 16dp margins, and enable vertical scrolling while standardizing view IDs.

Explore how Android activities, bundles, and classes work together to build a button counter app, wiring onCreate, setContentView, and app compat to support older devices.

Link layout widgets to Java code by using findViewById with proper casting, bind edit text, button, and text view, and reference the R.id values for your app compat activity.

Learn to write clear, well-structured questions using descriptive titles, proper grammar, and a bug-report style with observed versus expected behavior. Include steps to reproduce and what you tried.

Learn to implement button click functionality in Android by wiring the button to an onClickListener in the main activity, with the R class resources and view updates.

Address ID confusion by simulating layout errors, validate button IDs with findViewById, and test onclicklistener behavior while exploring Android Studio lint warnings and preparing for the next Android challenge.

Discover how android saves and restores the activity state during orientation changes, using a bundle in onCreate and calling super.onCreate to preserve edit text, preventing crashes.

Learn to debug with adb and logcat, and manage the activity lifecycle by saving and restoring state with on pause, on save instance state, and on restore instance state.

Understand the Android activity lifecycle and how to save and restore text using on save instance state and on restore instance state.

Master how to build your first Java program in Android Studio by creating a Hello World class, declaring a main method, and printing with system.out println.

Learn how to use boolean conditions and if/else in Java, while building a player class with fields and encapsulation, and distinguish between a class template and its instances.

Implement encapsulation in a Java player class by using a constructor to initialize fields, and expose getters and setters with length validation for the handle name.

Learn how to overload constructors in java to create players with default or specified names and levels, using this to chain constructors and initialize fields efficiently.

Learn how Java uses method signatures and constructors to create objects, set a default weapon, and chain getters and setters, illustrated with a weapon and a player example.

Explore how to integrate loot, inventory, and testing in a Java-based game. Add items via loot type enum, print and manage inventory from the player class, and test dropping loot.

Discover how the do-while loop in Java guarantees at least one execution by testing the condition at the end, unlike a while loop.

Build a simple calculator app to practice complex layouts, constraint layout guidelines, button listeners, different layouts for portrait and landscape screens, and use Android Studio diff feature to compare code.

Build a basic calculator app in Android Studio, using grouped widgets and a shared OnClickListener. App evaluates on operator input, shows two display lines, and supports portrait and landscape layouts.

Add ids and symbols to calculator buttons ( /, *, -, ., =, + ) and constrain layout. Set wrap_content, make mean width 48dp, and center the new number and operation text views.

Constrain inputs to the layout edges, adjust margins and text sizes, and enable decimal input with proper focus behavior for responsive portrait and landscape layouts.

Create separate landscape layouts for different screen sizes in Android Studio, adjust constraints between two edit text widgets, and refine landscape orientation with a landscape variation.

Learn to troubleshoot android layouts by using Android Studio's built-in diff tool to compare XML layout files, reformat code, align component trees, and synchronize changes.

Learn to streamline development with android studio's diff tool, comparing entire directories like res and java, and understand how package names from your company domain affect project matching.

Preserve app state across orientation changes by implementing onSaveInstanceState and onRestoreInstanceState to store and retrieve pending operations and operands for the calculator app.

Learn to center groups of widgets in constraint layout using vertical guidelines, baseline constraints, and careful margin settings, demonstrated on a calculator layout in portrait and landscape.

Implement the neg button by adding a dedicated onClickListener to negate numbers from an edit text, handle empty input and invalid numbers, and test in landscape before portrait changes.

Download and parse an RSS feed with XML. Display results in a ListView with adapters, including a custom adapter, using AsyncTask for background work, and a menu.

Use an AsyncTask to run a background download in doInBackground, passing parameters with varargs and execute. Implement downloadXML with HttpURLConnection and BufferedReader, handling MalformedURLException via try-catch and log.e.

Create a feed entry data model and parse the iTunes RSS feed with XmlPullParser, extracting name, artist, release date, summary, and image URL into a FeedEntry list for display.

Demonstrates validating the xml parser by testing parsed feed entries and displaying their fields, including title, name, release date, and image URLs, via logcat verification.

Learn to display dynamic data in a ListView by wiring an ArrayAdapter to an ArrayList of FeedEntry objects, using a layout item, and calling setAdapter to render a scrollable list.

Implement a custom Android adapter by overriding getCount and getView to populate a ListView from the applications list, inflating the item layout and binding name, artist, and summary.

Optimize list rendering in Android by reusing views with convertView in a custom adapter, reducing memory use and scroll lag in large lists.

Learn to implement the ViewHolder pattern in your list adapters to cache TextView references, replace repeated findViewById calls, and improve ListView performance and smoothness on older devices.

Create and display interactive Android menus with the menu designer, a feeds_menu, and items like free apps, paid apps, and songs, inflating in MainActivity.

Develop and wire up an Android options menu by handling onOptionsItemSelected with a switch on the MenuItem ID, setting feed URLs, and reusing a downloadUrl method to fetch data.

Add a refresh option to the feed menu, compare the cached URL to avoid re-downloading, and restore the URL in onCreate after rotation.

Learn to integrate third-party libraries using the YouTube API, download and include the library in your app, explore callback methods and event-driven programming, and dynamically add widgets at runtime.

Set up a YouTube video player app in Android Studio and configure a unique company domain for the API key, using a third-party library and the YouTube API with callbacks.

Download the YouTube Android Player API jar, copy it into the libs folder, update the module build.gradle to reference the jar, and sync Gradle to enable the YouTube API.

Create a YouTube activity from the main screen using Android Studio’s activity wizard, naming it YouTubeActivity and using layout activity_youtube. Implement YouTubeBaseActivity and OnInitializedListener to use the YouTube Player API.

Learn to handle onInitializationFailure for the YouTube Player by displaying toasts or Google error dialogs. Use isUserRecoverableError and getErrorDialog, and request internet permission.

Implement the onInitializationSuccess method to start playback when a YouTube player initializes, using wasRestored to skip new video loading, display a toast, log events, and queue the video by ID.

Test app functionality by running on a real device, handle orientation changes, and implement playback and state listeners for YouTube video events, including onPlaying, onPaused, and onVideoEnded.

Learn to implement YouTube player callbacks using PlaybackEventListener and PlayerStateChangeListener, initialize listeners in onInitializationSuccess, and validate events with toast messages as videos play and end.

Explore autoplaying videos with YouTube's standalone player using createVideoIntent and createPlaylistIntent, including timeMillis, autoplay, lightboxMode, and startIndex parameters.

Explore material design and theming Android versions, download JSON data with AsyncTask, and implement RecyclerView with adapters and gesture detection to display Flickr thumbnails and photos via a search view.

Explore how to use Flickr's public feed API to search public photos by tags, choose data formats like JSON or XML, and display images in an Android app.

Validate JSON with JSONLint, resolve JSONP versus JSON issues by using nojsoncallback in the Flickr API, and apply the lang parameter to view feeds in German and Chinese.

Set up a Flickr Browser project in Android Studio, convert layouts to ConstraintLayout, fix Gradle sync, and add logging with live templates for JSON download via AsyncTask and an adapter.

Implement an asynchronous data download with a GetRawData AsyncTask class that fetches data from a URL, tracks status via a DownloadStatus enum, and logs errors for debugging.

Create a Flickr data flow with GetFlickrJsonData and Photo classes, parse downloaded data into photo objects, and refresh MainActivity through a callback to the RecyclerView.

Learn to build GetFlickrJsonData in Android Java by implementing OnDownloadComplete, handling callbacks from GetRawData, and constructing the Flickr URI with baseURL and parameters.

Build dynamic urls with Uri.Builder for Flickr API requests using appendQueryParameter. Parse the json response with org.json to extract items, titles, authors, and image links.

Learn to parse Flickr JSON data into photo objects, use callbacks to return results after asynchronous tasks run on the same thread, and fetch larger image URLs for display.

Test json parsing with the GetFlickrJsonData class, implement callbacks in onPostExecute, and manage background tasks by running on the same thread to avoid extra threads.

Explore safe callback invocation and optimization for android async tasks, implementing runInSameThread and onDataAvailable across GetRawData and GetFlickrJsonData, with MainActivity and AsyncTask.

Create a recycler view interface for the Flickr browser, integrating content_main with activity_main, and configure constraints, margins, and a vertical scrollbar while applying toolbar layout behavior.

Create a search activity with a toolbar and a defined hierarchical parent, then design a photo detail layout using a vertical linear layout, scroll view, and card view.

Explore advanced Android UI layouts by nesting a linear layout inside a card view within a scroll view, adding text views and image views with careful margins and padding.

Design a recycler view adapter to display photo thumbnails by binding a list of Photo objects to a FlickrImageViewHolder. Thumbnails download asynchronously from Flickr as the list scrolls.

Learn to load remote images asynchronously in a RecyclerView using Picasso, with placeholder and error handling, while binding data in onBindViewHolder and updating the ViewHolder's ImageView.

Analyze touch events in a RecyclerView by examining onInterceptTouchEvent and using a GestureDetector for onSingleTapUp and onLongPress.

Implement click and long-press interactions in a RecyclerView using a GestureDetectorCompat, with logging and callbacks to MainActivity for onItemClick and onItemLongClick.

Learn how to pass a serializable photo object between activities, add a serialVersionUID, and display its details in PhotoDetailActivity by binding text views and loading the image.

Explore Material Design principles introduced by Google for Android, focusing on interactive guidelines that shape app appearance and user interactions across devices, including Gmail and Google Play app examples.

Explore how Android maintains backward compatibility by using the design support library and AppCompat to deliver Material Design across older versions, while leveraging newer features on Nougat.

Apply material design styling to the Flickr app by configuring a global AppTheme and its NoActionBar variant in the manifest, and by defining colors in colors.xml and styles.xml.

Learn to organize colors in styles.xml, extend AppTheme.NoActionBar to replace the action bar with a toolbar, and create values-v23 styles to fix CardView backgrounds on API 23 and above.

Update and sync Android Studio projects with the latest build tools, adjust Gradle versions, and apply material design colors by editing styles.xml and color resources for Marshmallow and newer APIs.

Explore handling Android API level differences and layout challenges, adjust ImageView bounds for responsive images, and experiment with margins and paddings to achieve usable, device-aware apps.

Learn to replace hard-coded text with string resources in Android development, use strings.xml for titles and descriptions, apply contentDescription for accessibility, and call getString with placeholders to format dynamic content.

Learn to integrate a SearchView into the app toolbar by creating a menu_search, wiring the SearchView in SearchActivity, handling onCreateOptionsMenu, and configuring a basic searchable.xml with label and hint.

Learn to implement a user-friendly search in an Android app using a SearchView, OnQueryTextListener, and a SearchActivity to pass queries back to MainActivity and filter Flickr photos.

Set up Windows command line to access adb and the sql lite command-line interface by configuring the Android SDK platform-tools path and adjusting environment variables.

Master SQLite data retrieval with select queries, views, and joins. Use a music database to explore schema, primary keys, not null constraints, and auto-increment behavior.

Master advanced querying by ordering data with order by, handling case sensitivity with collate no case, grouping by multiple columns, and joining songs, albums, and artists using inner joins.

Master complex sql querying by combining tables with inner joins across songs, albums, and artists, using select statements, where clauses, and order by to produce tailored outputs.

Learn Android SQLite concepts by backing up and restoring databases, running selective queries, and tackling a comprehensive sql housekeeping challenge.

Create a basic Android SQLite database with a contacts table, insert rows, and query data via a cursor in Java, as a simplified introduction not following best practices.

Debug SQL statements in Android code by logging queries, reading stack traces, and fixing create table syntax to ensure data loads and displays correctly.

Learn to manage an android sqlite database by handling create table errors with drop table if exists, iterating cursor data with moveToFirst and do-while, and displaying records with toast messages.

Explore Android content providers to share structured data between apps, manage database access across lifecycle events, and use a cursor loader for a contacts app with add, edit, and delete.

Set up Android emulators with and without Google APIs to explore the Contacts content provider, create test contacts, and understand runtime permissions for accessing the device's contacts.

Explore how Android uses content providers to access the device's contacts data, request permissions, and build a simple app that lists contact names using a list view.

Learn to access Android contacts data via a content provider by querying ContactsContract.Contacts with a content resolver, selecting display_name_primary and sorting by the contact name.

Discover how a content resolver sits between your app and data sources, using URI and authority to route requests to the content provider and fetch data via a cursor.

Explore how to use the content resolver and content provider to query contacts, handle cursors safely, and add read_contacts permission, preparing for Marshmallow runtime permissions changes.

Implement API 23+ runtime permissions in Android by declaring manifest permissions and requesting them at runtime with checkSelfPermission and the v4 support library for contacts.

Master the Android runtime permission flow by checking with checkSelfPermission, requesting with requestPermissions for API 23 and above, and handling grant or denial via onRequestPermissionsResult.

Examine how an Android app requests and handles runtime permissions, including granted and denied results and the dont ask again flow, using logcat and an emulator.

Learn to use intents with setData and URIs for advanced interactions, including permission rationale handling and guiding users to app settings when access is denied.

Develop and validate robust app behavior by constructing and running a practical test script that covers permission flows, granting and revoking, and Android Marshmallow API 23 scenarios.

Learn to build a task timer app with a sqlite database, including tasks and timings tables, fragment-driven layouts, and robust data deletion with cascades and reports.

Create the app database class that extends SQLiteOpenHelper, implement a singleton to supply a single database instance for content providers, and initialize the tasks table in onCreate.

Learn how the uri matcher simplifies content provider uri handling by mapping patterns with addUri to constants and directing actions via a clean switch statement.

Learn how a content provider uses uri matching and a query builder to query tasks, timings, and task_durations, with contract methods to extract ids and build content URIs.

Register and test an Android content provider's query method by querying the database via the content resolver, logging cursor results, and validating URIs.

Implement robust data inputs and prevent sql injection by using a content provider with content values, uri-based operations, and selection arguments to insert, query, update, and delete tasks.

Create and configure the main menu in Android Studio by adding five menu items with IDs and string resources. Assign icons and AppCompat showAsAction properties, and manage visibility for testing.

Use the sdk manager to install api 25 and the corresponding system image. Update build.gradle to target api 25 and use build tools 25.00 for compatibility.

Design the add_edit layout with a vertical linear layout, three edit texts (addedit_name, addedit_description, addedit_sort_order), and a save button (addedit_save).

Develop a serializable task data model in Java, with an id and getters, then initialize an add/edit fragment to manage creating and editing tasks within a single Android activity framework.

Examine the generated files when adding a fragment to an activity, including the manifest and content_add_edit and fragment_add_edit layouts for reuse and two-pane layouts.

Explore how the AddEditActivity and its AddEditActivityFragment integrate with MainActivity, enabling back navigation, two-pane layouts, and launching AddEditActivity to add or edit tasks via intents that carry a serializable Task.

Attach a save button listener and use a content provider to insert or update tasks, while a fragment handles add or edit modes via intents and bundles.

Learn to display database data in a RecyclerView by implementing a CursorRecyclerViewAdapter that reads from a Cursor and binds photo details to item views.

Corrects errors, extracts string resources, and implements adapter logic to power a recycler view with a cursor, ensuring updated data through the loader and content provider.

Implement content provider notifications to refresh the RecyclerView. Use notifyChange on the changed URI and setNotificationUri in queries, handled automatically by the built-in cursor loader.

Explore testing database updates and implementing case-insensitive SQLite sorting by adding no case handling to the sort order, setting notification URIs, and cursor loader requery workflows.

Implement button click listeners in the adapter and expose a callback interface to notify when edit or delete buttons are tapped, with log messages validating on-click events and task data.

Demonstrates using fragments to dynamically adapt the main layout, including creating a landscape layout and placing the addedit fragment alongside the main list for wide screens.

Dynamically add fragments to a layout based on screen configuration, using two-pane layouts and the fragment manager to show add/edit fragments.

Leverage fragment transactions with FragmentManager to add and manage fragments in a layout, commit changes, and pass a task object via a bundle for editing in a 2-pane Android interface.

Pass task data to fragments using setArguments and getArguments with a bundle. Use replace instead of add when swapping fragments for reliable portrait and landscape behavior.

Implement the OnSaveClick interface in the add/edit activity to pass the task bundle to the fragment. Verify portrait and landscape modes save and reflect changes.

Learn to manage Android fragments by using replace to avoid overlays, implement removal via callbacks, and enforce activity interfaces to prevent crashes.

Implement fragment removal and refine the user experience by wiring save actions through on save click, managing fragment transactions, and supporting portrait and landscape workflows.

Review databases concepts, sql with sqlite, content providers and loaders, including contract classes, content resolver, cursors, recycler view adapters, and fragments.

Learn how to use Android dialogs: when to show alerts, date picker, and time picker, follow material design guidelines, and implement callbacks for handling user actions.

Extract and validate dialog arguments from the bundle in onCreateDialog to obtain the dialog ID, message, and optional button labels. Implement onCancel and onDismiss with proper logging and lifecycle behavior.

Learn to implement delete confirmation in Android apps by using a custom AppDialog, passing task ID and task name, and wiring null-safe callbacks to confirm deletions before removal.

Learn to improve Android reliability by using BuildConfig.DEBUG checks for task id validation in the dialogue flow, instead of asserts, and ensure taskId is passed via the bundle for onPositiveDialogResult.

Apply Yagni by avoiding unused constants and refactoring names with a dialogue prefix to boost readability. Use a canClose stub to test dialogue behavior and catch back navigation issues.

Master how to manage multiple dialogs by routing events through a dialogId switch, handling DIALOG_ID_DELETE and DIALOG_ID_CANCEL_EDIT to execute delete or finish actions, and safely implement onDialogCancelled for interface completeness.

Implement a confirmation dialog for unsaved changes when the back or up button is pressed in portrait mode. Use AddEditActivity's fragment canClose logic and dialog events to manage navigation.

Learn to finalize the about dialog by formatting text with HTML, managing string resources, and applying correct padding and link handling for web, email, and credits.

Explore how to dismiss an Android about dialog using click listeners and an OK button, and learn to attach onClick to any view while safely handling nulls and isShowing checks.

Test your Android app across API 16 and above using emulators, verify toolbar behavior, and fix URL compatibility by using version-specific resources and intents to launch a browser.

Learn to ensure clickable web links across Android API levels by refactoring string resources, creating API-specific layouts, and using two text views for pre-21 devices with on-click handling.

Create an API 21 variant of about_web_url.xml with a single TextView, use about_weblink_21 for text, and include it in about.xml to avoid nesting and improve performance.

Run the app on api 16 and api 25 emulators to verify cross-version functionality, add an onClickListener for the about URL, and ensure the URL scheme is present.

Understand how appcompat libraries influence fragment lifecycles and dialog handling, and learn to diagnose compatibility issues by examining onAttach versus onCreate, API level differences, and proper lifecycle use.

Learn to adapt DialogFragment using the Android support libraries for backward compatibility, updating imports, and using the support fragment manager for reliable behavior.

Explore how Android support libraries expand compatibility and add features like RecyclerView and ConstraintLayout. AppCompat enables consistent dialogues across API levels, reducing code changes when Android versions update.

Update the about dialog to match modern Android styling by using the v7 AlertDialog from the support library, and adopt AppCompatDialogFragment for consistency.