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由于提供的文档内容是通过OCR扫描获得，存在文字识别错误或漏识别的情况，为了满足您的要求，我将基于已识别的内容和合理的推测来整理知识点。鉴于您要求的知识点必须详细，以下是对标题“Android最新技术指南”所涉及知识点的详尽阐述。 ### Android平台开发基础 #### 创建新项目 Android开发开始于创建新项目，这是开发者的起点。在Android Studio中创建新项目涉及选择一个项目模板，定义应用的名称、包名、保存位置等，并且配置目标Android版本和API级别。了解如何创建新项目对于新手来说至关重要。 #### 设置Android Studio Android Studio是官方推荐的Android开发环境，它提供了一套完整的工具，包括代码编辑器、调试器、模拟器等。掌握如何设置Android Studio，包括安装、配置SDK、配置模拟器等，是进行Android开发的基础。 #### Android编程无IDE 尽管Android Studio是官方推荐的IDE，但开发者也可以选择不使用任何集成开发环境（IDE），使用命令行工具进行Android应用的开发。这包括使用Ant或者Gradle作为构建工具，以及直接使用ADB（Android Debug Bridge）进行应用部署和调试。 #### 应用程序基础了解Android应用程序的基础是必不可少的，它包括了解四大核心组件：Activity、Service、BroadcastReceiver和ContentProvider。这些组件共同协作完成应用程序的所有功能。 #### 设置AVD (Android Virtual Device) AVD是一个模拟器，用于在开发者的工作站上模拟Android设备。设置AVD可以让开发者测试应用程序在不同设备和不同系统版本上的表现。 ### Android布局管理 #### LayoutParams LayoutParams用于定义布局参数，它们决定了视图在父布局中的位置和大小。不同类型的布局如LinearLayout、RelativeLayout、FrameLayout等有着不同的LayoutParams。 #### Gravity和layout_gravity Gravity属性控制的是子视图在其父视图中的位置，而layout_gravity控制的是自身在其父布局中的位置。理解这两个属性对于布局的排布至关重要。 #### CoordinatorLayout滚动行为 CoordinatorLayout是用于实现复杂交互的容器。例如，它支持滚动监听功能，可以实现如浮动按钮跟随列表滚动上升或隐藏等交互效果。 #### PercentLayouts PercentLayout允许开发者使用百分比而不是固定的数值来定义视图的大小和位置，这在不同屏幕尺寸和方向上创建响应式设计提供了极大的便利。 #### ViewWeight ViewWeight用于定义在父布局中多个子视图平分可用空间的比例。在使用线性布局（LinearLayout）时，掌握ViewWeight可以更好地控制子视图在布局中的占比。 #### LinearLayout、RelativeLayout、FrameLayout、GridLayout和CoordinatorLayout 这些是Android中常用的布局类型。每种布局类型都有其独特的使用场景和优势。例如，LinearLayout简单易用，适合创建垂直或水平的列表；RelativeLayout则可以创建复杂的视图层次关系；FrameLayout常用于包含单一子视图；GridLayout用于实现网格布局；CoordinatorLayout则主要用于高级交互设计。 ### Gradle for Android Gradle是Android Studio的构建工具，提供了灵活的构建配置，使得构建过程自动化和可配置化。在Android开发中，掌握Gradle的使用是进行高效开发的关键。 #### build.gradle文件 build.gradle文件是Gradle构建脚本的核心部分，它包含了模块的构建配置信息。了解如何配置build.gradle，可以定义项目结构、依赖关系、构建类型等。 #### 定义和使用Build配置字段在build.gradle文件中，可以通过构建脚本定义变量，便于在项目中多处引用相同的配置信息，例如应用版本号、编译SDK版本等。 #### 中央化依赖管理通过dependencies.gradle文件可以实现依赖关系的中央化管理，这样可以避免每个模块重复声明相同依赖，降低维护成本。 #### 签名APK 签名是将密钥库信息与应用APK文件关联的过程。通过Gradle可以配置APK的签名信息，而无需在构建脚本中暴露密钥库密码。 #### 定义产品风味产品风味允许开发者构建具有不同配置的同一应用，例如免费版和付费版。Gradle可以为不同的产品风味配置不同的依赖、资源、构建类型等。 #### 构建版本控制通过version.properties文件，可以轻松地管理应用的版本，例如版本号、版本名称等。 #### 修改输出APK名称和添加版本名称在Gradle构建过程中可以修改输出APK的名称，并添加版本名称，方便构建和发布不同版本的应用。 #### 添加产品风味特定资源为不同的产品风味配置不同的资源文件，可以进一步区分不同版本的应用。 #### Gradle文件的双文件结构 Android Studio项目中通常存在两个build.gradle文件，一个是项目级别的，另一个是模块级别的。了解这两个文件的作用和区别，可以帮助开发者更好地管理项目。 #### 产品风味特定资源目录结构产品风味特定的资源文件通常存放在特定的目录结构中，以便于管理和识别。 #### 启用Proguard Proguard用于压缩和优化APK文件，而通过Gradle启用Proguard可以自动化这一过程。 #### 忽略构建变体忽略特定构建变体可以避免在构建过程中生成不需要的APK文件，节省构建时间。 #### 启用NDK插件支持启用NDK插件支持可以让开发者使用Gradle构建包含本地代码的Android应用。 #### 显示签名信息显示签名信息有助于验证和调试应用签名过程。 #### 查看依赖树查看依赖树可以帮助开发者了解应用中使用的依赖关系，有助于解决潜在的依赖冲突。 #### 禁用图片压缩禁用图片压缩可以生成包含高分辨率图片资源的APK文件，但可能会使APK文件变大。 #### 自动删除未对齐的APK 在构建过程中，删除未对齐的APK文件可以确保发布的APK是优化过的，减小文件大小。 #### 执行Shell脚本在Gradle构建过程中可以执行Shell脚本，这为构建过程增加了更多自动化和自定义的可能性。 ### 结语以上提到的内容构成了Android开发中的关键知识点。无论是创建新项目、管理布局、还是使用Gradle进行构建配置，每一块都是Android开发不可或缺的部分。开发者需要深入理解这些概念，并在实践中加以运用，以构建出既高效又可靠的应用程序。由于文档内容可能存在识别上的误差，本回答中部分细节可能需要您根据实际Android开发文档进一步核实。

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Android

Notes for Professionals

Android

™

Notes for Professionals

GoalKicker.com

Free Programming Books

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This is an unocial free book created for educational purposes and is

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the property of their respective owners

1000+ pages

of professional hints and tricks

Contents

About 1 ...................................................................................................................................................................................

Chapter 1: Getting started with Android 2 ...........................................................................................................

Section 1.1: Creating a New Project 2 ..............................................................................................................................

Section 1.2: Setting up Android Studio 12 .......................................................................................................................

Section 1.3: Android programming without an IDE 13 ..................................................................................................

Section 1.4: Application Fundamentals 17 ......................................................................................................................

Section 1.5: Setting up an AVD (Android Virtual Device) 18 .........................................................................................

Chapter 2: Layouts 22 .....................................................................................................................................................

Section 2.1: LayoutParams 22 .........................................................................................................................................

Section 2.2: Gravity and layout gravity 25 ....................................................................................................................

Section 2.3: CoordinatorLayout Scrolling Behavior 27 .................................................................................................

Section 2.4: Percent Layouts 29 ......................................................................................................................................

Section 2.5: View Weight 30 ............................................................................................................................................

Section 2.6: Creating LinearLayout programmatically 31 ...........................................................................................

Section 2.7: LinearLayout 32 ...........................................................................................................................................

Section 2.8: RelativeLayout 33 ........................................................................................................................................

Section 2.9: FrameLayout 35 ..........................................................................................................................................

Section 2.10: GridLayout 36 .............................................................................................................................................

Section 2.11: CoordinatorLayout 38 .................................................................................................................................

Chapter 3: Gradle for Android 40 .............................................................................................................................

Section 3.1: A basic build.gradle ﬁle 40 ...........................................................................................................................

Section 3.2: Deﬁne and use Build Conﬁguration Fields 42 ...........................................................................................

Section 3.3: Centralizing dependencies via "dependencies.gradle" ﬁle 44 .................................................................

Section 3.4: Sign APK without exposing keystore password 46 ..................................................................................

Section 3.5: Adding product ﬂavor-speciﬁc dependencies 47 .....................................................................................

Section 3.6: Specifying dierent application IDs for build types and product ﬂavors 48 .........................................

Section 3.7: Versioning your builds via "version.properties" ﬁle 49 .............................................................................

Section 3.8: Deﬁning product ﬂavors 50 ........................................................................................................................

Section 3.9: Changing output apk name and add version name: 50 ..........................................................................

Section 3.10: Adding product ﬂavor-speciﬁc resources 51 ..........................................................................................

Section 3.11: Why are there two build.gradle ﬁles in an Android Studio project? 51 .................................................

Section 3.12: Directory structure for ﬂavor-speciﬁc resources 52 ...............................................................................

Section 3.13: Enable Proguard using gradle 52 .............................................................................................................

Section 3.14: Ignoring build variant 52 ............................................................................................................................

Section 3.15: Enable experimental NDK plugin support for Gradle and AndroidStudio 53 .......................................

Section 3.16: Display signing information 55 .................................................................................................................

Section 3.17: Seeing dependency tree 56 .......................................................................................................................

Section 3.18: Disable image compression for a smaller APK ﬁle size 56 ....................................................................

Section 3.19: Delete "unaligned" apk automatically 57 ................................................................................................

Section 3.20: Executing a shell script from gradle 57 ...................................................................................................

Section 3.21: Show all gradle project tasks 58 ...............................................................................................................

Section 3.22: Debugging your Gradle errors 59 ............................................................................................................

Section 3.23: Use gradle.properties for central versionnumber/buildconﬁgurations 60 .........................................

Section 3.24: Deﬁning build types 61 ..............................................................................................................................

Chapter 4: RecyclerView onClickListeners 62 ....................................................................................................

Section 4.1: Kotlin and RxJava example 62 ...................................................................................................................

Section 4.2: RecyclerView Click listener 63 ....................................................................................................................

Section 4.3: Another way to implement Item Click Listener 64 ...................................................................................

Section 4.4: New Example 66 ..........................................................................................................................................

Section 4.5: Easy OnLongClick and OnClick Example 67 .............................................................................................

Section 4.6: Item Click Listeners 70 .................................................................................................................................

Chapter 5: NavigationView 72 ....................................................................................................................................

Section 5.1: How to add the NavigationView 72 ............................................................................................................

Section 5.2: Add underline in menu elements 76 ..........................................................................................................

Section 5.3: Add seperators to menu 77 ........................................................................................................................

Section 5.4: Add menu Divider using default DividerItemDecoration 78 ...................................................................

Chapter 6: Intent 80 .........................................................................................................................................................

Section 6.1: Getting a result from another Activity 80 ...................................................................................................

Section 6.2: Passing data between activities 82 ............................................................................................................

Section 6.3: Open a URL in a browser 83 .......................................................................................................................

Section 6.4: Starter Pattern 84 ........................................................................................................................................

Section 6.5: Clearing an activity stack 85 ......................................................................................................................

Section 6.6: Start an activity 85 .......................................................................................................................................

Section 6.7: Sending emails 86 ........................................................................................................................................

Section 6.8: CustomTabsIntent for Chrome Custom Tabs 86 .....................................................................................

Section 6.9: Intent URI 87 .................................................................................................................................................

Section 6.10: Start the dialer 88 .......................................................................................................................................

Section 6.11: Broadcasting Messages to Other Components 88 ..................................................................................

Section 6.12: Passing custom object between activities 89 ..........................................................................................

Section 6.13: Open Google map with speciﬁed latitude, longitude 91 .........................................................................

Section 6.14: Passing dierent data through Intent in Activity 91 ...............................................................................

Section 6.15: Share intent 93 ............................................................................................................................................

Section 6.16: Showing a File Chooser and Reading the Result 93 ...............................................................................

Section 6.17: Sharing Multiple Files through Intent 95 ...................................................................................................

Section 6.18: Start Unbound Service using an Intent 95 ...............................................................................................

Section 6.19: Getting a result from Activity to Fragment 96 ........................................................................................

Chapter 7: JSON in Android with org.json 98 .....................................................................................................

Section 7.1: Creating a simple JSON object 98 ..............................................................................................................

Section 7.2: Create a JSON String with null value 98 ...................................................................................................

Section 7.3: Add JSONArray to JSONObject 98 ............................................................................................................

Section 7.4: Parse simple JSON object 99 .....................................................................................................................

Section 7.5: Check for the existence of ﬁelds on JSON 100 .........................................................................................

Section 7.6: Create nested JSON object 100 .................................................................................................................

Section 7.7: Updating the elements in the JSON 101 ...................................................................................................

Section 7.8: Using JsonReader to read JSON from a stream 101 .............................................................................

Section 7.9: Working with null-string when parsing json 103 ......................................................................................

Section 7.10: Handling dynamic key for JSON response 104 ......................................................................................

Chapter 8: Android Studio 106 ...................................................................................................................................

Section 8.1: Setup Android Studio 106 ............................................................................................................................

Section 8.2: View And Add Shortcuts in Android Studio 106 ........................................................................................

Section 8.3: Android Studio useful shortcuts 107 ..........................................................................................................

Section 8.4: Android Studio Improve performance tip 108 ..........................................................................................

Section 8.5: Gradle build project takes forever 108 ......................................................................................................

Section 8.6: Enable/Disable blank line copy 109 ..........................................................................................................

Section 8.7: Custom colors of logcat message based on message importance 110 ...............................................

Section 8.8: Filter logs from UI 111 .................................................................................................................................

Section 8.9: Create ﬁlters conﬁguration 112 .................................................................................................................

Section 8.10: Create assets folder 113 ...........................................................................................................................

Chapter 9: Resources 115 .............................................................................................................................................

Section 9.1: Deﬁne colors 115 ..........................................................................................................................................

Section 9.2: Color Transparency(Alpha) Level 116 ......................................................................................................

Section 9.3: Deﬁne String Plurals 116 .............................................................................................................................

Section 9.4: Deﬁne strings 117 ........................................................................................................................................

Section 9.5: Deﬁne dimensions 118 ................................................................................................................................

Section 9.6: String formatting in strings.xml 118 ...........................................................................................................

Section 9.7: Deﬁne integer array 119 .............................................................................................................................

Section 9.8: Deﬁne a color state list 119 ........................................................................................................................

Section 9.9: 9 Patches 120 ...............................................................................................................................................

Section 9.10: Getting resources without "deprecated" warnings 123 .........................................................................

Section 9.11: Working with strings.xml ﬁle 123 ...............................................................................................................

Section 9.12: Deﬁne string array 124 ..............................................................................................................................

Section 9.13: Deﬁne integers 125 ....................................................................................................................................

Section 9.14: Deﬁne a menu resource and use it inside Activity/Fragment 125 .......................................................

Chapter 10: Data Binding Library 127 .....................................................................................................................

Section 10.1: Basic text ﬁeld binding 127 ........................................................................................................................

Section 10.2: Built-in two-way Data Binding 128 ...........................................................................................................

Section 10.3: Custom event using lambda expression 129 ..........................................................................................

Section 10.4: Default value in Data Binding 131 ............................................................................................................

Section 10.5: Databinding in Dialog 131 .........................................................................................................................

Section 10.6: Binding with an accessor method 131 .....................................................................................................

Section 10.7: Pass widget as reference in BindingAdapter 132 ...................................................................................

Section 10.8: Click listener with Binding 133 ...................................................................................................................

Section 10.9: Data binding in RecyclerView Adapter 134 .............................................................................................

Section 10.10: Databinding in Fragment 135 .................................................................................................................

Section 10.11: DataBinding with custom variables(int,boolean) 136 ............................................................................

Section 10.12: Referencing classes 136 ...........................................................................................................................

Chapter 11: Exceptions 138 ............................................................................................................................................

Section 11.1: ActivityNotFoundException 138 ..................................................................................................................

Section 11.2: OutOfMemoryError 138 ..............................................................................................................................

Section 11.3: Registering own Handler for unexpected exceptions 138 ......................................................................

Section 11.4: UncaughtException 140 ..............................................................................................................................

Section 11.5: NetworkOnMainThreadException 140 ......................................................................................................

Section 11.6: DexException 142 ........................................................................................................................................

Chapter 12: Getting Calculated View Dimensions 143 ....................................................................................

Section 12.1: Calculating initial View dimensions in an Activity 143 .............................................................................

Chapter 13: AsyncTask 144 ...........................................................................................................................................

Section 13.1: Basic Usage 144 ..........................................................................................................................................

Section 13.2: Pass Activity as WeakReference to avoid memory leaks 146 ..............................................................

Section 13.3: Download Image using AsyncTask in Android 147 ................................................................................

Section 13.4: Canceling AsyncTask 150 ..........................................................................................................................

Section 13.5: AsyncTask: Serial Execution and Parallel Execution of Task 150 ..........................................................

Section 13.6: Order of execution 153 ..............................................................................................................................

Section 13.7: Publishing progress 153 .............................................................................................................................

Chapter 14: SharedPreferences 155 ........................................................................................................................

Section 14.1: Implementing a Settings screen using SharedPreferences 155 .............................................................

Section 14.2: Commit vs. Apply 157 ................................................................................................................................

Section 14.3: Read and write values to SharedPreferences 157 ..................................................................................

Section 14.4: Retrieve all stored entries from a particular SharedPreferences ﬁle 158 ............................................

Section 14.5: Reading and writing data to SharedPreferences with Singleton 159 ...................................................

Section 14.6: getPreferences(int) VS getSharedPreferences(String, int) 163 .............................................................

Section 14.7: Listening for SharedPreferences changes 163 .......................................................................................

Section 14.8: Store, Retrieve, Remove and Clear Data from SharedPreferences 164 ..............................................

Section 14.9: Add ﬁlter for EditTextPreference 164 .......................................................................................................

Section 14.10: Supported data types in SharedPreferences 165 .................................................................................

Section 14.11: Dierent ways of instantiating an object of SharedPreferences 165 ..................................................

Section 14.12: Removing keys 166 ...................................................................................................................................

Section 14.13: Support pre-Honeycomb with StringSet 166 .........................................................................................

Chapter 15: Emulator 168 ..............................................................................................................................................

Section 15.1: Taking screenshots 168 ..............................................................................................................................

Section 15.2: Simulate call 173 .........................................................................................................................................

Section 15.3: Open the AVD Manager 173 .....................................................................................................................

Section 15.4: Resolving Errors while starting emulator 173 .........................................................................................

Chapter 16: Material Design 175 ................................................................................................................................

Section 16.1: Adding a Toolbar 175 .................................................................................................................................

Section 16.2: Buttons styled with Material Design 176 ..................................................................................................

Section 16.3: Adding a FloatingActionButton (FAB) 177 ...............................................................................................

Section 16.4: RippleDrawable 178 ...................................................................................................................................

Section 16.5: Adding a TabLayout 183 ...........................................................................................................................

Section 16.6: Bottom Sheets in Design Support Library 185 ........................................................................................

Section 16.7: Apply an AppCompat theme 188 .............................................................................................................

Section 16.8: Add a Snackbar 189 ...................................................................................................................................

Section 16.9: Add a Navigation Drawer 190 ...................................................................................................................

Section 16.10: How to use TextInputLayout 193 .............................................................................................................

Chapter 17: Lint Warnings 194 ....................................................................................................................................

Section 17.1: Using tools:ignore in xml ﬁles 194 .............................................................................................................

Section 17.2: Conﬁgure LintOptions with gradle 194 .....................................................................................................

Section 17.3: Conﬁguring lint checking in Java and XML source ﬁles 195 ..................................................................

Section 17.4: How to conﬁgure the lint.xml ﬁle 195 .......................................................................................................

Section 17.5: Mark Suppress Warnings 196 ...................................................................................................................

Section 17.6: Importing resources without "Deprecated" error 196 ............................................................................

Chapter 18: Service 198 ..................................................................................................................................................

Section 18.1: Lifecycle of a Service 198 ...........................................................................................................................

Section 18.2: Deﬁning the process of a service 199 ......................................................................................................

Section 18.3: Creating an unbound service 199 .............................................................................................................

Section 18.4: Starting a Service 202 ................................................................................................................................

Section 18.5: Creating Bound Service with help of Binder 202 .....................................................................................

Section 18.6: Creating Remote Service (via AIDL) 203 ..................................................................................................

Chapter 19: Storing Files in Internal & External Storage 205 ......................................................................

Section 19.1: Android: Internal and External Storage - Terminology Clariﬁcation 205 ..............................................

Section 19.2: Using External Storage 209 .......................................................................................................................

Section 19.3: Using Internal Storage 210 ........................................................................................................................

Section 19.4: Fetch Device Directory : 210 .....................................................................................................................

Section 19.5: Save Database on SD Card (Backup DB on SD) 212 .............................................................................

Chapter 20: WebView 214 .............................................................................................................................................

Section 20.1: Troubleshooting WebView by printing console messages or by remote debugging 214 .................

Section 20.2: Communication from Javascript to Java (Android) 215 ......................................................................

Section 20.3: Communication from Java to Javascript 216 .......................................................................................