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Android.com

# Tools

The Android SDK includes a variety of tools that help you develop mobile applications for the Android platform. The tools are classified into two groups: SDK tools and platform tools. SDK tools are platform independent and are required no matter which Android platform you are developing on. Platform tools are customized to support the features of the latest Android platform.

## SDK Tools

The SDK tools are installed with the SDK starter package and are periodically updated. The SDK tools are required if you are developing Android applications. The most important SDK tools include the Android SDK and AVD Manager (`android`), the emulator (`emulator`), and the Dalvik Debug Monitor Server (`ddms`). A short summary of some frequently-used SDK tools is provided below.

android
  Lets you manage AVDs, projects, and the installed components of the SDK.
Dalvik Debug Monitor Server (ddms)
  Lets you debug Android applications.
dmtracedump
  Generates graphical call-stack diagrams from trace log files. The tool uses the Graphviz Dot utility to create the graphical output, so you need to install Graphviz before running `dmtracedump`. For more information on using `dmtracedump`, see Profiling with Traceview and dmtracedump
Draw 9-patch
  Allows you to easily create a `NinePatch` graphic using a WYSIWYG editor. It also previews stretched versions of the image, and highlights the area in which content is allowed.
Android Emulator (emulator)
  A QEMU-based device-emulation tool that you can use to design, debug, and test your applications in an actual Android run-time environment.
Hierarchy Viewer (hierarchyviewer)
  Lets you debug and optimize an Android application's user interface.
hprof-conv
  Converts the HPROF file that is generated by the Android SDK tools to a standard format so you can view the file in a profiling tool of your choice.
layoutopt
  Lets you quickly analyze your application's layouts in order to optimize them for efficiency.
mksdcard
  Helps you create a disk image that you can use with the emulator, to simulate the presence of an external storage card (such as an SD card).
Monkey
  Runs on your emulator or device and generates pseudo-random streams of user events such as clicks, touches, or gestures, as well as a number of system-level events. You can use the Monkey to stress-test applications that you are developing, in a random yet repeatable manner.
monkeyrunner
  Provides an API for writing programs that control an Android device or emulator from outside of Android code.
ProGuard
  Shrinks, optimizes, and obfuscates your code by removing unused code and renaming classes, fields, and methods with semantically obscure names.
sqlite3
  Lets you access the SQLite data files created and used by Android applications.
traceview
  Provides a graphical viewer for execution logs saved by your application.
zipalign
  Optimizes `.apk` files by ensuring that all uncompressed data starts with a particular alignment relative to the start of the file. This should always be used to align .apk files after they have been signed.

## Platform Tools

The platform tools are typically updated every time you install a new SDK platform. Each update of the platform tools is backward compatible with older platforms. Usually, you directly use only one of the platform tools—the Android Debug Bridge (`adb`). Android Debug Bridge is a versatile tool that lets you manage the state of an emulator instance or Android-powered device. You can also use it to install an Android application (.apk) file on a device.

The other platform tools, such as aidl, `aapt`, `dexdump`, and `dx`, are typically called by the Android build tools or Android Development Tools (ADT), so you rarely need to invoke these tools directly. As a general rule, you should rely on the build tools or the ADT plugin to call them as needed.

Note: The Android SDK provides additional shell tools that can be accessed through `adb`, such as bmgr and logcat.

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