Emulator Startup Options

Emulator Startup Options

The emulator supports a variety of options that you can specify when launching the emulator, to control its appearance or behavior. Here's the command-line usage for launching the emulator with options:
emulator -avd <avd_name> [-<option> [<value>]] ... [-<qemu args>]
The table below summarizes the available options.
CategoryOptionDescriptionComments
Help-helpPrint a list of all emulator options.
-help-allPrint help for all startup options.
-help-<option>Print help for a specific startup option.
-help-debug-tagsPrint a list of all tags for -debug <tags>.
-help-disk-imagesPrint help for using emulator disk images.
-help-environmentPrint help for emulator environment variables.
-help-keysPrint the current mapping of keys.
-help-keyset-filePrint help for defining a custom key mappings file.
-help-virtual-devicePrint help for Android Virtual Device usage.
AVD-avd <avd_name> or
@<avd_name>
Required. Specifies the AVD to load for this emulator instance.You must create an AVD configuration before launching the emulator. For information, see Android Virtual Devices.
Disk Images-cache <filepath>Use <filepath> as the working cache partition image.Optionally, you can specify a path relative to the current working directory. If no cache file is specified, the emulator's default behavior is to use a temporary file instead.For more information on disk images, use -help-disk-images.
-data <filepath>Use <filepath> as the working user-data disk image.Optionally, you can specify a path relative to the current working directory. If -data is not used, the emulator looks for a file named "userdata-qemu.img" in the storage area of the AVD being used (see -avd).
-initdata <filepath>When resetting the user-data image (through-wipe-data), copy the contents of this file to the new user-data disk image. By default, the emulator copies the <system>/userdata.img.Optionally, you can specify a path relative to the current working directory. See also -wipe-data.For more information on disk images, use -help-disk-images.
-nocacheStart the emulator without a cache partition.See also -cache <file>.
-ramdisk <filepath>Use <filepath> as the ramdisk image.Default value is <system>/ramdisk.img.Optionally, you can specify a path relative to the current working directory. For more information on disk images, use-help-disk-images.
-sdcard <filepath>Use <file> as the SD card image.Default value is <system>/sdcard.img.Optionally, you can specify a path relative to the current working directory. For more information on disk images, use-help-disk-images.
-wipe-dataReset the current user-data disk image (that is, the file specified by -datadir and -data, or the default file). The emulator deletes all data from the user data image file, then copies the contents of the file at -inidata data to the image file before starting.See also -initdata.For more information on disk images, use -help-disk-images.
Debug-debug <tags>Enable/disable debug messages for the specified debug tags.<tags> is a space/comma/column-separated list of debug component names. Use -help-debug-tags to print a list of debug component names that you can use.
-debug-<tag>Enable/disable debug messages for the specified debug tag.Use -help-debug-tags to print a list of debug component names that you can use in <tag>.
-debug-no-<tag>Disable debug messages for the specified debug tag.
-logcat <logtags>Enable logcat output with given tags.If the environment variable ANDROID_LOG_TAGS is defined and not empty, its value will be used to enable logcat output by default.
-shellCreate a root shell console on the current terminal.You can use this command even if the adb daemon in the emulated system is broken. Pressing Ctrl-c from the shell stops the emulator instead of the shell.
-shell-serial <device>Enable the root shell (as in -shell and specify the QEMU character device to use for communication with the shell.<device> must be a QEMU device type. See the documentation for '-serial dev' athttp://www.bellard.org/qemu/qemu-doc.html#SEC10 for a list of device types.
Here are some examples:
  • -shell-serial stdio is identical to -shell
  • -shell-serial tcp::4444,server,nowait lets you communicate with the shell over TCP port 4444
  • -shell-serial fdpair:3:6 lets a parent process communicate with the shell using fds 3 (in) and 6 (out)
  • -shell-serial fdpair:0:1 uses the normal stdin and stdout fds, except that QEMU won't tty-cook the data.
-show-kernel <name>Display kernel messages.
-trace <name>Enable code profiling (press F9 to start), written to a specified file.
-verboseEnable verbose output.Equivalent to -debug-init.You can define the default verbose output options used by emulator instances in the Android environment variable ANDROID_VERBOSE. Define the options you want to use in a comma-delimited list, specifying only the stem of each option: -debug-<tags>.
Here's an example showing ANDROID_VERBOSE defined with the -debug-init and -debug-modem options:
ANDROID_VERBOSE=init,modem
For more information about debug tags, use <-help-debug-tags>.
Media-audio <backend>Use the specified audio backend.
-audio-in <backend>Use the specified audio-input backend.
-audio-out <backend>Use the specified audio-output backend.
-noaudioDisable audio support in the current emulator instance.
-radio <device>Redirect radio modem interface to a host character device.
-useaudioEnable audio support in the current emulator instance.Enabled by default.
Network-dns-server <servers>Use the specified DNS server(s).The value of <servers> must be a comma-separated list of up to 4 DNS server names or IP addresses.
-http-proxy <proxy>Make all TCP connections through a specified HTTP/HTTPS proxyThe value of <proxy> can be one of the following:
http://<server>:<port>
http://<username>:<password>@<server>:<port>The http:// prefix can be omitted. If the -http-proxy <proxy> command is not supplied, the emulator looks up thehttp_proxy environment variable and automatically uses any value matching the <proxy> format described above.
-netdelay <delay>Set network latency emulation to <delay>.Default value is none. See the table in Network Delay Emulationfor supported <delay> values.
-netfastShortcut for -netspeed full -netdelay none
-netspeed <speed>Set network speed emulation to <speed>.Default value is full. See the table in Network Speed Emulation for supported <speed> values.
-port <port>Set the console port number for this emulator instance to <port>.The console port number must be an even integer between 5554 and 5584, inclusive. <port>+1 must also be free and will be reserved for ADB.
-report-console <socket>Report the assigned console port for this emulator instance to a remote third party before starting the emulation.<socket> must use one of these formats:tcp:<port>[,server][,max=<seconds>]
unix:<port>[,server][,max=<seconds>]
Use -help-report-console
to view more information about this topic.
System-cpu-delay <delay>Slow down emulated CPU speed by <delay>Supported values for <delay> are integers between 0 and 1000.Note that the <delay> does not correlate to clock speed or other absolute metrics — it simply represents an abstract, relative delay factor applied non-deterministically in the emulator. Effective performance does not always scale in direct relationship with <delay> values.
-gps <device>Redirect NMEA GPS to character device.Use this command to emulate an NMEA-compatible GPS unit connected to an external character device or socket. The format of <device> must be QEMU-specific serial device specification. See the documentation for 'serial -dev' athttp://www.bellard.org/qemu/qemu-doc.html#SEC10.
-nojniDisable JNI checks in the Dalvik runtime.
-qemuPass arguments to qemu.
-qemu -hDisplay qemu help.
-radio <device>Redirect radio mode to the specified character device.The format of <device> must be QEMU-specific serial device specification. See the documentation for 'serial -dev' athttp://www.bellard.org/qemu/qemu-doc.html#SEC10.
-timezone <timezone>Set the timezone for the emulated device to <timezone>, instead of the host's timezone.<timezone> must be specified in zoneinfo format. For example:"America/Los_Angeles"
"Europe/Paris"
-versionDisplay the emulator's version number.
UI-dpi-device <dpi>Scale the resolution of the emulator to match the screen size of a physical device.The default value is 165. See also -scale.
-no-boot-animDisable the boot animation during emulator startup.Disabling the boot animation can speed the startup time for the emulator.
-no-windowDisable the emulator's graphical window display.
-scale <scale>Scale the emulator window.<scale> is a number between 0.1 and 3 that represents the desired scaling factor. You can also specify scale as a DPI value if you add the suffix "dpi" to the scale value. A value of "auto" tells the emulator to select the best window size.
-raw-keysDisable Unicode keyboard reverse-mapping.
-noskinDon't use any emulator skin.
-keyset <file>Use the specified keyset file instead of the default.The keyset file defines the list of key bindings between the emulator and the host keyboard. For more information, use -help-keyset to print information about this topic.
-onion <image>Use overlay image over screen.No support for JPEG. Only PNG is supported.
-onion-alpha <percent>Specify onion skin translucency value (as percent).Default is 50.
-onion-rotation <position>Specify onion skin rotation.<position> must be one of the values 0, 1, 2, 3.
-skin <skinID>Start the emulator with the specified skin.The standard Android platforms includes a choice of four skins:

  • HVGA-L (480x320, landscape)
  • HVGA-P (320x480, portrait) (default)
  • QVGA-L (320x240, landscape)
  • QVGA-P (240x320, portrait)
  • -skindir <dir>Search for emulator skins in <dir>.

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