Hjem

;Authors of Head First Android Development;How to Use This Book: Intro; Who is this book for?; We know what you''re thinking; We know what your brain is thinking; Metacognition: thinking about thinking; Here''s what WE did:; Here''s what YOU can do to bend your brain into submission; Read me; The technical review team; Acknowledgments; Safari® Books Online;
Chapter 1: Getting Started: Diving In;
1.1 Welcome to Androidville;
1.2 The Android platform dissected;
1.3 Here''s what we''re going to do;
1.4 Your development environment;
1.5 Install Java;
1.6 Build a basic app;
1.7 Let''s build the basic app;
1.8 Activities and layouts from 50,000 feet;
1.9 Building a basic app (continued);
1.10 Building a basic app (continued);
1.11 You''ve just created your first Android app;
1.12 Android Studio creates a complete folder structure for you;
1.13 Useful files in your project;
1.14 Edit code with the Android Studio editors;
1.15 Run the app in the Android emulator;
1.16 Creating an Android Virtual Device;
1.17 Run the app in the emulator;
1.18 You can watch progress in the console;
1.19 Test drive;
1.20 What just happened?;
1.21 Refining the app;
1.22 What''s in the layout?;
1.23 activity_main.xml has two elements;
1.24 The layout file contains a reference to a string, not the string itself;
1.25 Let''s look in the strings.xml file;
1.26 Take the app for a test drive;
1.27 Your Android Toolbox;
Chapter 2: Building Interactive Apps: Apps That Do Something;
2.1 You''re going to build a Beer Adviser app;
2.2 Here''s what you need to do;
2.3 Create the project;
2.4 We''ve created a default activity and layout;
2.5 Adding components with the design editor;
2.6 activity_find_beer.xml has a new button;
2.7 A closer look at the layout code;
2.8 Changes to the XML...;
2.9
...are reflected in the design editor;
2.10 Use string resources rather than hardcoding the text;
2.11 Change the layout to use the string resources;
2.12 Let''s take the app for a test drive;
2.13 Add values to the spinner;
2.14 Get the spinner to reference a string-array;
2.15 Test drive the spinner;
2.16 We need to make the button do something;
2.17 Make the button call a method;
2.18 What activity code looks like;
2.19 Add an onClickFindBeer() method to the activity;
2.20 onClickFindBeer() needs to do something;
2.21 Once you have a View, you can access its methods;
2.22 Update the activity code;
2.23 The first version of the activity;
2.24 What the code does;
2.25 Test drive the changes;
2.26 Building the custom Java class;
2.27 Enhance the activity to call the custom Java class so that we can get REAL advice;
2.28 Activity code version 2;
2.29 What happens when you run the code;
2.30 Test drive your app;
2.31 Your Android Toolbox;
Chapter 3: Multiple Activities and Intents: State Your Intent;
3.1 Apps can contain more than one activity;
3.2 Here''s the app structure;
3.3 Create the project;
3.4 Update the layout;
3.5 Update strings.xml...;
3.6 Create the second activity and layout;
3.7 What just happened?;
3.8 Welcome to the Android manifest file;
3.9 Every activity needs to be declared;
3.10 An intent is a type of message;
3.11 Use an intent to start the second activity;
3.12 What happens when you run the app;
3.13 The story continues...;
3.14 Test drive the app;
3.15 Pass text to a second activity;
3.16 Update the text view properties;
3.17 putExtra() puts extra information in an intent;
3.18 Update the CreateMessageActivity code;
3.19 Get ReceiveMessageActivity to use the information in the intent;
3.20 What happens when the user clicks the Send Message button;
3.21 Test drive the app;
3.22 We can change the app to send messages to other people;
3.23 How Android apps work;
3.24 But we don''t know what apps are on the device;
3.25 Create an intent that specifies an action;
3.26 Change the intent to use an action;
3.27 What happens when the code runs;
3.28 The story continues...;
3.29 The intent filter tells Android which activities can handle which actions;
3.30 How Android uses the intent filter;
3.31 You need to run your app on a REAL device;
3.32 Test drive the app;
3.33 What if you ALWAYS want your users to choose an activity?;
3.34 What happens when you call createChooser();
3.35 The story continues...;
3.36 Change the code to create a chooser;
3.37 Test drive the app;
3.38 If you have NO matching activities;
3.39 Your Android Toolbox;
Chapter 4: The Activity Lifecycle: Being an Activity;
4.1 How do activities really work?;
4.2 The Stopwatch app;
4.3 The stopwatch layout code;
4.4 How the activity code will work;
4.5 Add code for the buttons;
4.6 The runTimer() method;
4.7 Handlers allow you to schedule code;
4.8 The full runTimer() code;
4.9 The full StopwatchActivity code;
4.10 What happens when you run the app;
4.11 The story continues;
4.12 Test drive the app;
4.13 What just happened?;
4.14 Rotating the screen changes the device configuration;
4.15 From birth to death: the states of an activity;
4.16 The activity lifecycle: from create to destroy;
4.17 Your activity inherits the lifecycle methods;
4.18 How do we deal with configuration changes?;
4.19 Or save the current state...;
4.20
...then restore the state in onCreate();
4.21 What happens when you run the app;
4.22 The story continues;
4.23 Test drive the app;
4.24 There''s more to an activity''s life than create and destroy;
4.25 The activity lifecycle: the visible lifetime;
4.26 We need to implement two more lifecycle methods;
4.27 The updated StopwatchActivity code;
4.28 What happens when you run the app;
4.29 Test drive the app;
4.30 But what if an app is only partially visible?;
4.31 The activity lifecycle: the foreground lifetime;
4.32 Stop the stopwatch if the activity''s paused;
4.33 What happens when you run the app;
4.34 Test drive the app;
4.35 The complete activity code;
4.36 Your handy guide to the lifecycle methods;
4.37 Your Android Toolbox;
Chapter 5: The User Interface: Enjoy the View;
5.1 Your user interface is made up of layouts and GUI components;
5.2 Three key layouts: relative, linear, and grid;
5.3 RelativeLayout displays views in relative positions;
5.4 Adding padding;
5.5 Positioning views relative to the parent layout;
5.6 Attributes for positioning views relative to the parent layout;
5.7 Positioning views relative to other views;
5.8 Attributes for positioning views relative to other views;
5.9 Use margins to add distance between views;
5.10 RelativeLayout: a summary;
5.11 LinearLayout displays views in a single row or column;
5.12 A linear layout displays views in the order they appear in the layout XML;
5.13 Let''s change up a basic linear layout;
5.14 Here''s the starting point for the linear layout;
5.15 Make a view streeeeetch by adding weight;
5.16 Adding weight to one view;
5.17 Adding weight to multiple views;
5.18 Use gravity to specify where text appears in a view;
5.19 Test drive;
5.20 Using the android:gravity attribute: a list of values;
5.21 Move the button to the right with layout-gravity;
5.22 More values you can use with the android:layout-gravity attribute;
5.23 The full linear layout code;
5.24 LinearLayout: a summary;
5.25 GridLayout displays views in a grid;
5.26 Adding views to the grid layout;
5.27 Let''s create a new grid layout;
5.28 We''ll start with a sketch;
5.29 Row
0: add views to specific rows and columns;
5.30 Row
1: make a view span multiple columns;
5.31 Row
2: make a view span multiple columns;
5.32 The full code for the grid layout;
5.33 GridLayout: a summary;
5.34 Layouts and GUI components have a lot in common;
5.35 GUI components are a type of View;
5.36 What being a view buys you;
5.37 A layout is really a hierarchy of Views;
5.38 Playing with views;
5.39 Text view;
5.40 Edit Text;
5.41 Button;
5.42 Toggle button;
5.43 Switch;
5.44 Check boxes;
5.45 Radio buttons;
5.46 Spinner;
5.47 Image views;
5.48 Images: the layout XML;
5.49 Adding images to buttons;
5.50 Image Button;
5.51 Scroll views;
5.52 Toasts;
5.53 Your Android Toolbox;
Chapter 6: List Views and Adapters: Getting Organized;
6.1 Every app starts with ideas;
6.2 Categorize your ideas: top-level, category, and detail/edit activities;
6.3 Navigating through the activities;
6.4 Use ListViews to navigate to data;
6.5 We''re going to build
part of the Starbuzz app;
6.6 The drink detail activity;
6.7 The Starbuzz app structure;
6.8 Here are the steps;
6.9 The Drink class;
6.10 The image files;
6.11 The top-level layout contains an image and a list;
6.12 Use a list view to display the list of options;
6.13 The full top-level layout code;
6.14 Test drive;
6.15 Get ListViews to respond to clicks with a Listener;
6.16 Set the listener to the list view;
6.17 The full TopLevelActivity code;
6.18 Where we''ve got to;
6.19 A category activity displays the data for a single category;
6.20 A ListActivity is an activity that contains only a list;
6.21 How to create a list activity;
6.22 android:entries works for static array data held in strings.xml;
6.23 Connect list views to arrays with an array adapter;
6.24 Add the array adapter to DrinkCategoryActivity;
6.25 What happens when you run the code;
6.26 Test drive the app;
6.27 App review: where we''ve got to;
6.28 How we handled clicks in TopLevelActivity;
6.29 Pass data to an activity using the ListActivity onListItemClick() method;
6.30 The full DrinkCategoryActivity code;
6.31 A detail activity displays data for a single record;
6.32 Retrieve data from the intent;
6.33 Update the views with the data;
6.34 The DrinkActivity code;
6.35 What happens when you run the app;
6.36 The story continues;
6.37 Test drive the app;
6.38 Your Android Toolbox;
Chapter 7: Fragments: Make it Modular;
7.1 Your app needs to look great on all devices;
7.2 Your app may need to behave differently too;
7.3 Fragments allow you to reuse code;
7.4 The Workout app structure;
7.5 Here are the steps;
7.6 The Workout class;
7.7 How to add a fragment to your project;
7.8 Fragment layout code looks just like activity layout code;
7.9 What fragment code looks like;