Android Platform Developer's Guide




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Android Platform Developer's Guide


Android Platform Developer's Guide 1

Android Platform Developer's Guide 5

About this Guide 5

Intended Audience 5

Getting Started with Android 5

Android Build System 6

In this document 6

Building the Android Platform 8

Building the Android Kernel 10

Build Variants 11

Configuring a New Product 12

In this document 12

Detailed Instructions 12

New Product File Tree 15

Product Definition Files 15

Build Cookbook 17

In this document 17

Building a simple APK 17

Building a APK that depends on a static .jar file 18

Building a APK that should be signed with the platform key 18

Building a APK that should be signed with a specific vendor key 19

Adding a prebuilt APK 19

Adding a Static Java Library 19

Android.mk Variables 20

Creating Release Keys and Signing Builds 29

In this document 29

Introduction 29

Generating keys 30

Signing a build for release 31

Customization 32

In this document 32

Boot Screen Customization 32

Network Customization Platform 33

Customizing pre-loaded applications 34

Customizing browser bookmarks 35

Email Provider Customization 37

Platform Themes 41

Bring Up 41

1. Confirm a Clean Installation of a Basic Linux Kernel 42

2. Modify Your Kernel Configuration to Accommodate Android Drivers 42

3. Write Drivers 42

4. Burn Images to Flash 43

5. Boot the kernel and mount the RAMdisk. 43

6. Debug Android-specific init programs on RAMdisk 44

7. Verify that applications have started 44

8. Pulling it all together 45

Android Init Language 45

Display Drivers 50

In this document 50

Functionality 51

Implementing Your Own Driver (Driver Template) 52

Troubleshooting 59

Keymaps and Keyboard Input 59

In this document 59

Functionality 60

Key Layout Map 61

Key Character Map 63

Implementing Your Own Driver (Driver Template) 67

Sample Implementation 70

Lights 70

In this document 70

Building a Lights Library 71

Interface 71

Audio 75


In this document 75

Building an Audio Library 77

Interface 77

Building a Camera Library 84

Sequence Diagrams 85

Wake Locks 90

Driver API 92

User-space API 93

Types of Wake Locks 93

Exploring a Wake Lock Example 93

PowerManager class 94

Registering Drivers with the PM Driver 94

Early Suspend 95

Sensors 95

In this document 95

Building a Sensor Library 96

Interface 97

RIL Initialization 99

RIL Interaction 99

Implementing the RIL 102

RIL Functions 103

Dalvik 105

In this document 105

Core Libraries 106

JNI Call Bridge 106

Interpreter 107

Mterp Interpreter Structure 108

Getting Started With Mterp 109

Replacing Stubs 110

Interpreter Switching 111

Testing 112

Testing and Debugging 113

Instrumentation Testing 113

In this document 113

Instrumentation Framework 114

Platform Test Suites 116

Running Tests 116

Writing Tests 120

Debugging with GDB 123

In this document 123

Debugging 124

Just-In-Time Debug Feature 126

Debugging Native Code 127

In this document 127

Capturing logs 127

Debug Scenarios 127

Debugging with tcpdump and other tools 135

Installing tcpdump 135

Running tcpdump 136

Other network debugging commands 138



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Android Platform Developer's Guide

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