Preface   xiii
Chapter 1 Why Android?   1
Adopting Android   1
  Full Stack   2
  Broad Acceptance   2
  Beautiful UI   2
  Linux Based   2
  Powerful Development Environment   3
  Open Source   3
AOSP and Google   5
Other Choices   6
  Micro-Controllers   6
  Other RTOSs   7
Summary   8
Chapter 2 Booting Acme   9
Setting Up a Build Machine   10
Downloading the Code   11
Repo   11
Forking the Source   15
  Android Version Selection   16
  Local Mirror   17
  Hosted Git Repositories   18
  Tree Snapshot   19
Repository Commit Pinning   19
Example: Local Mirror of Forked Repositories   19
Building an Image   24
Device Tools   27
  fastboot   28
  adb   29
Flashing the Device   30
Summary   33
Chapter 3 Getting Started   35
Putting Android in Its Place   35
  Hardware   36
  The Linux Kernel   36
  System Libraries   37
  Applications   38
  The Android Framework   39
The Android Service Model   40
Exploring the Source   43
  Other Sources   44
  What's in the Box?   44
Summary   48
Chapter 4 The Kernel   49
The Linux Kernel   49
  Kernel Process Management   50
  Kernel Memory Management   51
The Android Kernel   53
  Android Kernel Features   54
Building a Kernel   62
  The Build System   63
  Downloading the Source   63
Summary   66
Chapter 5 Platform Security   67
Types of Security   67
Verified Boot   68
Operational Security   69
  Android Software Layers   70
  The Process Sandbox   70
  SE Linux for Android   72
  SE Policy Definition   73
  Android Permissions   76
  File Systems   79
User Protections   82
Customizing Permissions   83
  Sample Custom Permission-Protected App   83
  Sample Custom Permission Client App   88
Summary   92
Chapter 6 System Startup: Installing and Booting the System   93
The Boot Process   93
  Bootloader   95
  Fastboot   99
  Kernel   100
  The File System   102
  init   104
Recovery   106
Building a Daemon   107
Creating the Acme Device   107
Repo Again   110
Starting the Daemon   111
Summary   114
Chapter 7 Android Startup: Dalvik and Zygote   115
Dalvik   116
  ART   120
  ART Basics   120
Hybrid ARTÂ Â Â 122
Zygote   123
  Zygote Memory Management   123
  Zygote Startup   127
  Runtime Initialization   128
  System Service Startup   129
Summary   131
Citations   131
Chapter 8Â Getting to Android: The HALÂ Â Â 133
Why a HAL?   133
Is a HAL Necessary?   135
Designing the HALÂ Â Â 136
Building a HALÂ Â Â 137
  Code Structure   138
  Implementing the HAL   140
Summary   151
Chapter 9Â Getting to Java: The JNIÂ Â Â 153
Code Structure   154
Using the Device   155
Using the HALÂ Â Â 157
Using the Java Native Interface   159
  Executing Native Code   160
  JNI: The Java Side   161
  JNI: The Native Side   162
  A Java Proximity Application   165
  JNI: Some Hints   176
Summary   182
Chapter 10Â Project Treble: Binderized HALÂ Â Â 183
HIDL Architecture   183
  hwservicemanager   185
  HIDL Services   185
  HIDL Client Applications   186
Hardware Interface Definition Language (HIDL)Â Â Â 186
  HIDL Types   191
HIDL Services   194
HIDL Clients   197
Summary   198
Chapter 11Â Creating a Custom Binderized HALÂ Â Â 199
Acme Custom HIDLÂ Â Â 199
Summary   217
Chapter 12Â Clients for a Custom Binderized HALÂ Â Â 219
Native C++ Aproximity Client   219
  SE Linux for Android Changes for aproximitycl   224
  Build aproximitycl into Acme   225
Java/Kotlin Aproximity Client   226
  SE Linux for Android Changes for AproximityClient   229
  Build AproximityClient into Acme   229
Summary   231
Index   233
