Android Basics Einf=C3=BChrung in Android Informaci=C3=B3n b=C3=A1sica sobre Android Pr=C3=A9sentation d'Android Nozioni di base su Android Android =E3=81=AE=E5=9F=BA=E6=9C=AC Android=20 =E5=9F=BA=E7=A1=80=E7=9F=A5=E8=AF=86 Android =E7=B0=A1=E4=BB=8B
- <= SPAN=20 class=3Den>What Is Android? Was=20 ist Android? =C2=BFQu=C3=A9 es=20 Android? Qu'est-ce=20 qu'Android ? Che cos'=C3=A8=20 Android? Android = =E3=81=A8=E3=81=AF Android = =E6=98=AF=E4=BB=80=E4=B9=88=EF=BC=9F =E4=BB=80=E9=BA=BC=E6=98=AF = Android=EF=BC=9F
- Application Fundamentals Anwendungsgrundlagen Fundamentos de las aplicaciones Principes de base des applications Concetti fondamentali sulle=20 applicazioni =E9=96=8B=E7=99=BA=E3=81=AE=E5=9F=BA=E7=A4=8E =E5=BA=94=E7=94=A8=E7=A8=8B=E5=BA=8F=E5=9F=BA=E7=A1=80 =E6=87=89=E7=94=A8=E7=A8=8B=E5=BC=8F=E5=9F=BA=E6=9C=AC=E5=8E= =9F=E7=90=86
Framework Topics Framework-Themen Temas=20 sobre el framework Th=C3=A8mes relatifs=20 au framework Argomenti = relativi al=20 framework =E3=83=95=E3=83=AC=E3=83=BC=E3=83=A0=E3=83=AF=E3=83=BC=E3=82=AF= =E3=83=88=E3=83=94=E3=83=83=E3=82=AF=20 =E6=A1=86=E6=9E=B6=E4=B8=BB=E9=A2=98 =E6=9E=B6=E6=A7=8B=E4=B8=BB=E9=A1=8C
- Activities
  - Fragments
  - Loaders
  - Tasks and Back Stack
- Services
  - Bound Services
- Content Providers updated
  - Calendar Provider new!=20
- Intents and Intent Filters
- Processes and Threads
- User Interface
  - XML Layouts
  - Input Events
  - Menus
  - Action Bar
  - Dialogs
  - Notifications
    - Toast Notifications
    - Status Bar Notifications
  - Drag and Drop
  - Styles and Themes
  - Custom Components
  - Binding to Data with AdapterView
  - Common Layout Objects
  - How Android Draws Views
- <= SPAN=20 class=3Den>Application Resources
  - Providing Resources
  - Accessing Resources
  - Handling Runtime Changes
  - Localization
  - Resource Types
    - Animation
    - Color=20 State List
    - Drawable
    - Layout
    - Menu
    - String
    - Style
    - More=20 Types
- Data Storage
  - Data Backup
- Security and Permissions
- The AndroidManifest.xml File
  - <action>
  - <activity>
  - <activity-alias>
  - <application>
  - <category>
  - <compatible-screens>
  - <data>
  - <grant-uri-permission>
  - <instrumentation>
  - <intent-filter>
  - <manifest>
  - <meta-data>
  - <path-permission>
  - <permission>
  - <permission-group>
  - <permission-tree>
  - <provider>
  - <receiver>
  - <service>
  - <supports-gl-texture>
  - <supports-screens>
  - <uses-configuration>
  - <uses-feature>
  - <uses-library>
  - <uses-permission>
  - <uses-sdk>
- Graphics new!
  - Canvas and Drawables
  - Hardware Acceleration new!
  - <= SPAN=20 class=3Den>OpenGL updated
- Animation
  - Property Animation
  - View Animation
  - Drawable Animation
- RenderScript
  - Graphics
  - Compute
- Multimedia and Camera updated
  - Media Playback
  - <= SPAN=20 class=3Den>JetPlayer
  - Camera new!
  - Audio Capture
- Copy and Paste
- Location and Maps
  - Obtaining User Location =
- = App Widgets
- Bluetooth
- Near Field Communication updated=20
  - NFC=20 Basics
  - = Advanced=20 NFC
- USB
  - Acc= essory
  - Host=
  - Open=20 Accessory Dev Kit
- Session Initiation Protocol
- Search
  - Creating=20 a Search Interface
  - Adding=20 Recent Query Suggestions
  - Adding=20 Custom Suggestions
  - Searchable=20 Configuration
- Device Administration
- Testing
  - Testing Fundamentals
  - Activity Testing
  - Content Provider Testing
  - Service Testing
  - What To Test
Android Market Topics
- Publishing on Android Market
- Application Licensing
- In-app Billing
  - In-app Billing Overview
  - Implementing In-app Billing
  - Security and Design
  - Testing In-app Billing
  - Administering In-app Billing
  - In-app Billing Reference
- = Market Filters
- Multiple APK Support
Developing Entwicklung Desarrollo D=C3=A9veloppement Sviluppo =E9=96=8B=E7=99=BA =E5=BC=80=E5=8F=91 =E9=96=8B=E7=99=BC
- Introduction
- Managing Virtual Devices
  - With AVD Manager
  - From the Command Line
  - Using the Android Emulator
- Using Hardware Devices
- Managing Projects
  - From Eclipse with ADT
  - From the Command Line
- Building and Running
  - From Eclipse with ADT
  - From the Command Line
- Debugging
  - From Eclipse with ADT
  - From Other IDEs
  - Using DDMS
  - Reading and Writing Logs
  - Debugging and Profiling UIs
  - Profiling with Traceview and dmtracedump =
  - Using the Dev Tools App
- Testing
  - From Eclipse with ADT
  - From Other IDEs
- <= SPAN=20 class=3Den>Tools
  - adb=
  - ADT=
  - android
  - bm= gr=20
  - dmtracedump
  - Draw=20 9-Patch
  - Emulator
  - etc1tool
  - Hierarchy=20 Viewer
  - hprof-conv
  - layoutopt
  - = logcat
  - mksdcard
  - = Monkey
  - monkeyrunner
    - MonkeyDevice
    - MonkeyImage
    - MonkeyRunner
  - ProGuard
  - sqlite3
  - Traceview
  - zipalign
Publishing Ver=C3=B6ffentlichung Publicaci=C3=B3n Publication Pubblicazione =E5=85=AC=E9=96=8B=20 =E5=8F=91=E5=B8=83 = =E7=99=BC=E4=BD=88
- Publishing Overview new!
- Preparing for Release Vorbereitung auf die Ver=C3=B6ffentlichung Publicaci=C3=B3n de = aplicaciones Pr=C3=A9paration =C3=A0 la = publication Preparativi per la = pubblicazione =E5=85=AC=E9=96=8B=E3=81=AE=E6=BA=96=E5=82=99 =E5=87=86=E5=A4=87=E5=8F=91=E5=B8=83 =E6=BA=96=E5=82=99=E7=99=BC=E4=BD=88=20 updated
- <= SPAN=20 class=3Den>Signing Your Applications Signieren Ihrer Anwendungen Firma de aplicaciones Attribution de votre signature
  =C3=A0 vos = applications Firma delle applicazioni = =E3=82=A2=E3=83=97=E3=83=AA=E3=82=B1=E3=83=BC=E3=82=B7=E3=83=A7= =E3=83=B3=E3=81=B8=E3=81=AE=E7=BD=B2=E5=90=8D =E5=BA=94=E7=94=A8=E7=A8=8B=E5=BA=8F=E7=AD=BE=E5=90=8D =E7=B0=BD=E7=BD=B2=E6=87=89=E7=94=A8=E7=A8=8B=E5=BC=8F
- Versioning Your Applications Versionsverwaltung f=C3=BCr Ihre
  Anwendungen = Versiones de las = aplicaciones Attribution d'une version =C3=A0 = vos=20 applications Controllo versioni=20 delle applicazioni =E3=82=A2=E3=83=97=E3=83=AA=E3=82=B1=E3=83=BC=E3=82=B7=E3=83=A7= =E3=83=B3=E3=81=AE=E3=83=90=E3=83=BC=E3=82=B8=E3=83=A7=E3=83=8B=E3=83=B3=E3= =82=B0 =E5=BA=94=E7=94=A8=E7=A8=8B=E5=BA=8F=E7=89=88=E6=9C=AC=E6=8E= =A7=E5=88=B6 =E6=87=89=E7=94=A8=E7=A8=8B=E5=BC=8F=E7=89=88=E6=9C=AC=E8=A8= =AD=E5=AE=9A
Best Practices Bew=C3=A4hrte Verfahren Pr=C3=A1cticas recomendadas Meilleures pratiques Best=20 practice =E3=83=99=E3=82=B9=E3=83=88 = =E3=83=97=E3=83=A9=E3=82=AF=E3=83=86=E3=82=A3=E3=82=B9 =E6=9C=80=E4=BD=B3=E5=AE=9E=E8=B7=B5 =E6=9C=80=E4=BD=B3=E5=AF=A6=E5=8B=99
- = Compatibility
- Supporting Multiple Screens
  - Distributing to Specific Screens
  - Screen Compatibility Mode
  - Strategies for Android 1.5
- Supporting Tablets and Handsets new!
- UI Guidelines updated
  - Icon Design updated =
    - Launcher Icons updated
    - Menu Icons
    - Action Bar Icons new! =
    - Status Bar Icons updated=20
    - Tab Icons
    - Dialog Icons
    - List View Icons
  - App Widget Design updated
  - Activity and Task Design
  - Menu Design
- Designing for Accessibility
- Designing for Performance
  - JNI Tips
- Designing for Responsiveness
- Designing for Seamlessness
Web Applications
- Web Apps Overview
- Targeting Screens from Web Apps
- Building Web Apps in WebView
- Debugging Web Apps
- <= SPAN=20 class=3Den>Best Practices for Web Apps
Appendix Anhang Ap=C3=A9ndice=20 Annexes Appendice =E4=BB=98=E9=8C=B2 =E9=99=84=E5=BD=95 =E9=99=84=E9=8C=84
- Android API Levels
- App Install Location
- <= SPAN=20 class=3Den>Supported Media Formats updated=20
- <= SPAN=20 class=3Den>Intents List: Google Apps
- AI= DL
- Glossary

T= ools=20 >

Android Debug Bridge

ADB quickview

Manage the state of an emulator or device
Run shell commands on a device
Manage port forwarding on an emulator or device
Copy files to/from an emulator or device

In this document

Issuing=20 ADB Commands
Querying=20 for Emulator/Device Instances
Directing=20 Commands to a Specific Emulator/Device Instance
Installing=20 an Application
Forwarding=20 Ports
Copying=20 Files to or from an Emulator/Device Instance
Listing=20 of adb Commands
Issuing=20 Shell Commands
Enabling=20 logcat Logging
Stopping=20 the adb Server

Issuing adb Commands

You can issue adb commands from a command line on your development = machine or=20 from a script. The usage is:

adb [-d|-e|-s =
<serialNumber>] <command>

When you issue a command, the program invokes an adb client. The = client is=20 not specifically associated with any emulator instance, so if multiple=20 emulators/devices are running, you need to use the -d = option to=20 specify the target instance to which the command should be directed. For = more=20 information about using this option, see Directing=20 Commands to a Specific Emulator/Device Instance.

Querying for Emulator/Device Instances

Before issuing adb commands, it is helpful to know what = emulator/device=20 instances are connected to the adb server. You can generate a list of = attached=20 emulators/devices using the devices command:

adb =
devices

In response, adb prints this status information for each = instance:

Serial number =E2=80=94 A string created by adb to uniquely = identify an=20 emulator/device instance by its console port number. The format of the = serial=20 number is <type>-<consolePort>. Here's an = example=20 serial number: emulator-5554
State =E2=80=94 The connection state of the instance. Three states = are supported:=20
- offline =E2=80=94 the instance is not connected to = adb or is not=20 responding.
- device =E2=80=94 the instance is now connected to = the adb server.=20 Note that this state does not imply that the Android system is fully = booted=20 and operational, since the instance connects to adb while the system = is=20 still booting. However, after boot-up, this is the normal = operational state=20 of an emulator/device instance.

The output for each instance is formatted like this: =

[serialNumber] [state]

Here's an example showing the devices command and its=20 output:

$ adb devices
List of devices attached=20
emulator-5554  device
emulator-5556  device
emulator-5558  device

If there is no emulator/device running, adb returns no=20 device.

Directing Commands to a Specific Emulator/Device Instance

If multiple emulator/device instances are running, you need to = specify a=20 target instance when issuing adb commands. To so so, use the = -s=20 option in the commands. The usage for the -s option = is:

adb -s <serialNumber> <command>

As shown, you specify the target instance for a command using its=20 adb-assigned serial number. You can use the devices command = to=20 obtain the serial numbers of running emulator/device instances.

Here is an example:

adb -s emulator-5556 install =
helloWorld.apk

Note that, if you issue a command without specifying a target = emulator/device=20 instance using -s, adb generates an error.

Installing an Application

You can use adb to copy an application from your development computer = and=20 install it on an emulator/device instance. To do so, use the=20 install command. With the command, you must specify the = path to the=20 .apk file that you want to install:

adb install =
<path_to_apk>

For more information about how to create an .apk file that you can = install on=20 an emulator/device instance, see Building=20 and Running

Note that, if you are using the Eclipse IDE and have the ADT plugin=20 installed, you do not need to use adb (or aapt) directly to install your = application on the emulator/device. Instead, the ADT plugin handles the=20 packaging and installation of the application for you.

Forwarding Ports

You can use the forward command to set up arbitrary port = forwarding =E2=80=94 forwarding of requests on a specific host port to a = different port=20 on an emulator/device instance. Here's how you would set up forwarding = of host=20 port 6100 to emulator/device port 7100:

adb forward tcp:6100 =
tcp:7100

You can also use adb to set up forwarding to named abstract UNIX = domain=20 sockets, as illustrated here:

adb forward tcp:6100 local:logd =

Copying Files to or from an Emulator/Device Instance

You can use the adb commands pull and push = to copy=20 files to and from an emulator/device instance's data file. Unlike the=20 install command, which only copies an .apk file to a = specific=20 location, the pull and push commands let you = copy=20 arbitrary directories and files to any location in an emulator/device = instance.=20

To copy a file or directory (recursively) from the emulator = or=20 device, use

adb pull <remote> <local>

To copy a file or directory (recursively) to the emulator or = device,=20 use

adb push <local> <remote>

In the commands, <local> and = <remote>=20 refer to the paths to the target files/directory on your development = machine=20 (local) and on the emulator/device instance (remote).

Here's an example:

adb push foo.txt /sdcard/foo.txt

Listing of adb Commands

The table below lists all of the supported adb commands and explains = their=20 meaning and usage.

Category	Command	Description	Comments
Options	`-d`	Direct an adb command to the only attached USB device.	Returns an error if more than one USB device is = attached.
`-e`	Direct an adb command to the only running emulator = instance.	Returns an error if more than one emulator instance is running. =
`-s <serialNumber>`	Direct an adb command a specific emulator/device instance, = referred to=20 by its adb-assigned serial number (such as "emulator-5556").	If not specified, adb generates an error.
General	`devices`	Prints a list of all attached emulator/device instances.	See Querying=20 for Emulator/Device Instances for more information.
`help`	Prints a list of supported adb commands.
`version`	Prints the adb version number.
Debug	`logcat [<option>] = [<filter-specs>]`	Prints log data to the screen.
`bugreport`	Prints `dumpsys`, `dumpstate`, and=20 `logcat` data to the screen, for the purposes of bug = reporting.=20
`jdwp`	Prints a list of available JDWP processes on a given device. =	You can use the `forward jdwp:<pid>` = port-forwarding=20 specification to connect to a specific JDWP process. For example:=20 `adb forward tcp:8000 jdwp:472` `jdb = -attach=20 localhost:8000`
Data	`install <path-to-apk>`	Pushes an Android application (specified as a full path to an = .apk=20 file) to the data file of an emulator/device.
`pull <remote> <local>`	Copies a specified file from an emulator/device instance to your = development computer.
`push <local> <remote>`	Copies a specified file from your development computer to an=20 emulator/device instance.
Ports and Networking	`forward <local> <remote>`	Forwards socket connections from a specified local port to a = specified=20 remote port on the emulator/device instance.	Port specifications can use these schemes:=20 `tcp:<portnum>` `local:<UNIX domain socket name>` `dev:<character device name>` `jdwp:<pid>`
`ppp <tty> [parm]...`	Run PPP over USB.=20 `<tty>` =E2=80=94 the tty for PPP stream. = For example=20 `dev:/dev/omap_csmi_ttyl`. `[parm]...` =E2=80=94 zero or more PPP/PPPD = options, such as=20 `defaultroute`, `local`, = `notty`,=20 etc. Note that you should not automatically start a PPP connection. =
Scripting	`get-serialno`	Prints the adb instance serial number string.	See Querying=20 for Emulator/Device Instances for more information.
`get-state`	Prints the adb state of an emulator/device = instance.
`wait-for-device`	Blocks execution until the device is online =E2=80=94 that is, = until the=20 instance state is `device`.	You can prepend this command to other adb commands, in which = case adb=20 will wait until the emulator/device instance is connected before = issuing=20 the other commands. Here's an example: adb wait-for-device = shell getprop Note that this command does=20 not cause adb to wait until the entire system is fully = booted.=20 For that reason, you should not prepend it to other commands that = require=20 a fully booted system. As an example, the `install` = requires=20 the Android package manager, which is available only after the = system is=20 fully booted. A command such as adb wait-for-device install = <app>.apk would issue the=20 `install` command as soon as the emulator or device = instance=20 connected to the adb server, but before the Android system was = fully=20 booted, so it would result in an error.
Server	`start-server`	Checks whether the adb server process is running and starts it, = if=20 not.
`kill-server`	Terminates the adb server process.
Shell	`shell`	Starts a remote shell in the target emulator/device = instance.	See Issuing=20 Shell Commands for more information.
`shell [<shellCommand>]`	Issues a shell command in the target emulator/device instance = and then=20 exits the remote shell.

Issuing Shell Commands

Adb provides an ash shell that you can use to run a variety of = commands on an=20 emulator or device. The command binaries are stored in the file system = of the=20 emulator or device, in this location:

/system/bin/...

You can use the shell command to issue commands, with or = without=20 entering the adb remote shell on the emulator/device.

To issue a single command without entering a remote shell, use the=20 shell command like this:

adb [-d|-e|-s =
{<serialNumber>}] shell <shellCommand>

To drop into a remote shell on a emulator/device instance, use the=20 shell command like this:

adb [-d|-e|-s =
{<serialNumber>}] shell

When you are ready to exit the remote shell, use CTRL+D = or=20 exit to end the shell session.

The sections below provide more information about shell commands that = you can=20 use.

Examining sqlite3 Databases from a Remote Shell

From an adb remote shell, you can use the sqlite3 command-line = program to=20 manage SQLite databases created by Android applications. The=20 sqlite3 tool includes many useful commands, such as=20 .dump to print out the contents of a table and = .schema=20 to print the SQL CREATE statement for an existing table. The tool also = gives you=20 the ability to execute SQLite commands on the fly.

To use sqlite3, enter a remote shell on the emulator = instance,=20 as described above, then invoke the tool using the sqlite3 = command.=20 Optionally, when invoking sqlite3 you can specify the full = path to=20 the database you want to explore. Emulator/device instances store = SQLite3=20 databases in the folder /data/data/<package_name>/d= atabases/.=20

Here's an example:

$ adb -s emulator-5554 shell
# sqlite3 =
/data/data/com.example.google.rss.rssexample/databases/rssitems.db
SQLite version 3.3.12
Enter ".help" for instructions
.... enter commands, then quit...
sqlite> .exit

Once you've invoked sqlite3, you can issue = sqlite3=20 commands in the shell. To exit and return to the adb remote shell, use=20 exit or CTRL+D.

UI/Application Exerciser Monkey

The Monkey is a program that runs on your emulator or device and = generates=20 pseudo-random streams of user events such as clicks, touches, or = gestures, as=20 well as a number of system-level events. You can use the Monkey to = stress-test=20 applications that you are developing, in a random yet repeatable = manner.

The simplest way to use the monkey is with the following command, = which will=20 launch your application and send 500 pseudo-random events to = it.

$ adb shell monkey -v -p your.package.name 500

For more information about command options for Monkey, see the = complete = UI/Application=20 Exerciser Monkey documentation page.

Other Shell Commands

The table below lists several of the adb shell commands available. = For a=20 complete list of commands and programs, start an emulator instance and = use the=20 adb -help command.

adb shell ls /system/bin

Help is available for most of the commands.

Shell Command	Description	Comments
`dumpsys`	Dumps system data to the screen.	The Dalvik=20 Debug Monitor Server (DDMS) tool offers integrated debug = environment=20 that you may find easier to use.
`dumpstate`	Dumps state to a file.
`logcat [<option>]... [<filter-spec>]...`	Enables radio logging and prints output to the screen. =
`dmesg`	Prints kernel debugging messages to the screen.
`start`	Starts (restarts) an emulator/device instance.
`stop`	Stops execution of an emulator/device instance.

Enabling logcat Logging

The Android logging system provides a mechanism for collecting and = viewing=20 system debug output. Logs from various applications and portions of the = system=20 are collected in a series of circular buffers, which then can be viewed = and=20 filtered by the logcat command.

Using logcat Commands

You can use the logcat command to view and follow the = contents=20 of the system's log buffers. The general usage is:

[adb] logcat =
[<option>] ... [<filter-spec>] ...

The sections below explain filter specifications and the command = options. See=20 Listing=20 of logcat Command Options for a summary of options.

You can use the logcat command from your development = computer or=20 from a remote adb shell in an emulator/device instance. To view log = output in=20 your development computer, you use

$ adb logcat

and from a remote adb shell you use

# logcat

Filtering Log Output

Every Android log message has a tag and a priority=20 associated with it.

The tag of a log message is a short string indicating the system = component=20 from which the message originates (for example, "View" for the view = system).=20
The priority is one of the following character values, ordered = from lowest=20 to highest priority:

V =E2=80=94 Verbose (lowest priority)
D =E2=80=94 Debug
I =E2=80=94 Info (default priority)
W =E2=80=94 Warning
E =E2=80=94 Error
F =E2=80=94 Fatal
S =E2=80=94 Silent (highest priority, on which = nothing is ever=20 printed)

You can obtain a list of tags used in the system, together with = priorities,=20 by running logcat and observing the first two columns of = each=20 message, given as <priority>/<tag>.

Here's an example of logcat output that shows that the message = relates to=20 priority level "I" and tag "ActivityManager":

I/ActivityManager( =
 585): Starting activity: Intent { =
action=3Dandroid.intent.action...}

To reduce the log output to a manageable level, you can restrict log = output=20 using filter expressions. Filter expressions let you indicate = to the=20 system the tags-priority combinations that you are interested in = =E2=80=94 the system=20 suppresses other messages for the specified tags.

A filter expression follows this format tag:priority = ..., where=20 tag indicates the tag of interest and priority = indicates the minimum level of priority to report for that tag. = Messages for that tag at or above the specified priority are written to = the log.=20 You can supply any number of tag:priority specifications in = a=20 single filter expression. The series of specifications is = whitespace-delimited.=20 The default output is to show all log messages with the Info priority = (*:I).

Here's an example of a filter expression that suppresses all log = messages=20 except those with the tag "ActivityManager", at priority "Info" or = above, and=20 all log messages with tag "MyApp", with priority "Debug" or = above:

adb logcat ActivityManager:I MyApp:D *:S

The final element in the above expression, *:S, sets the = priority level for all tags to "silent", thus ensuring only log messages = with=20 "View" and "MyApp" are displayed. Using *:S is an excellent = way to=20 ensure that log output is restricted to the filters that you have = explicitly=20 specified =E2=80=94 it lets your filters serve as a "whitelist" for log = output.

The following filter expression displays all log messages with = priority level=20 "warning" and higher, on all tags:

adb logcat *:W

If you're running logcat from your development computer = (versus=20 running it on a remote adb shell), you can also set a default filter = expression=20 by exporting a value for the environment variable=20 ANDROID_LOG_TAGS:

export =
ANDROID_LOG_TAGS=3D"ActivityManager:I MyApp:D *:S"

Note that ANDROID_LOG_TAGS filter is not exported to the = emulator/device instance, if you are running logcat from a = remote=20 shell or using adb shell logcat.

Controlling Log Output Format

Log messages contain a number of metadata fields, in addition to the = tag and=20 priority. You can modify the output format for messages so that they = display a=20 specific metadata field. To do so, you use the -v option = and=20 specify one of the supported output formats listed below.

brief =E2=80=94 Display priority/tag and PID of = originating process=20 (the default format).
process =E2=80=94 Display PID only.
tag =E2=80=94 Display the priority/tag only.
thread =E2=80=94 Display process:thread and = priority/tag only.
raw =E2=80=94 Display the raw log message, with no = other metadata=20 fields.
time =E2=80=94 Display the date, invocation time, = priority/tag, and=20 PID of the originating process.
long =E2=80=94 Display all metadata fields and = separate messages with=20 a blank lines.

When starting logcat, you can specify the output format = you want=20 by using the -v option:

[adb] logcat [-v =
<format>]

Here's an example that shows how to generate messages in = thread=20 output format:

adb logcat -v thread

Note that you can only specify one output format with the = -v=20 option.

Viewing Alternative Log Buffers

The Android logging system keeps multiple circular buffers for log = messages,=20 and not all of the log messages are sent to the default circular buffer. = To see=20 additional log messages, you can start logcat with the=20 -b option, to request viewing of an alternate circular = buffer. You=20 can view any of these alternate buffers:

radio =E2=80=94 View the buffer that contains = radio/telephony related=20 messages.
events =E2=80=94 View the buffer containing = events-related=20 messages.
main =E2=80=94 View the main log buffer = (default)

The usage of the -b option is:

[adb] logcat [-b =
<buffer>]

Here's an example of how to view a log buffer containing radio and = telephony=20 messages:

adb logcat -b radio

Viewing stdout and stderr

By default, the Android system sends stdout and=20 stderr (System.out and = System.err) output=20 to /dev/null. In processes that run the Dalvik VM, you can = have the=20 system write a copy of the output to the log file. In this case, the = system=20 writes the messages to the log using the log tags stdout = and=20 stderr, both with priority I.

To route the output in this way, you stop a running emulator/device = instance=20 and then use the shell command setprop to enable the = redirection of=20 output. Here's how you do it:

$ adb shell stop
$ adb shell setprop log.redirect-stdio true
$ adb shell start

The system retains this setting until you terminate the = emulator/device=20 instance. To use the setting as a default on the emulator/device = instance, you=20 can add an entry to /data/local.prop on the device.

Listing of logcat Command Options

Option	Description
`-b <buffer>`	Loads an alternate log buffer for viewing, such as = `event`=20 or `radio`. The `main` buffer is used by = default.=20 See Viewing=20 Alternative Log Buffers.
`-c`	Clears (flushes) the entire log and exits.
`-d`	Dumps the log to the screen and exits.
`-f <filename>`	Writes log message output to `<filename>`. The=20 default is `stdout`.
`-g`	Prints the size of the specified log buffer and exits. =
`-n <count>`	Sets the maximum number of rotated logs to = `<count>`.=20 The default value is 4. Requires the `-r` option. =
`-r <kbytes>`	Rotates the log file every `<kbytes>` of = output. The=20 default value is 16. Requires the `-f` option. =
`-s`	Sets the default filter spec to silent.
`-v <format>`	Sets the output format for log messages. The default is=20 `brief` format. For a list of supported formats, see Controlling=20 Log Output Format.

Stopping the adb Server

In some cases, you might need to terminate the adb server process and = then=20 restart it. For example, if adb does not respond to a command, you can = terminate=20 the server and restart it and that may resolve the problem.

To stop the adb server, use the kill-server. You can = then=20 restart the server by issuing any adb command.

=E2=86=91 Go to=20 top=20

=E2= =86=90=20 Back to Tools

Except as noted, this content is licensed under Apache 2.0. For = details=20 and restrictions, see the Content License. =

Android 4.0 r1 - 11 Nov 2011 21:02

Site Terms of = Service - Privacy Policy - Brand Guidelines=20

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Android Basics Einf=C3=BChrung in Android Informaci=C3=B3n b=C3=A1sica sobre Android Pr=C3=A9sentation d'Android Nozioni di base su Android Android =E3=81=AE=E5=9F=BA=E6=9C=AC Android=20 =E5=9F=BA=E7=A1=80=E7=9F=A5=E8=AF=86 Android =E7=B0=A1=E4=BB=8B

Android Market Topics

Developing Entwicklung Desarrollo D=C3=A9veloppement Sviluppo =E9=96=8B=E7=99=BA =E5=BC=80=E5=8F=91 =E9=96=8B=E7=99=BC

Publishing Ver=C3=B6ffentlichung Publicaci=C3=B3n Publication Pubblicazione =E5=85=AC=E9=96=8B=20 =E5=8F=91=E5=B8=83 = =E7=99=BC=E4=BD=88

Best Practices Bew=C3=A4hrte Verfahren Pr=C3=A1cticas recomendadas Meilleures pratiques Best=20 practice =E3=83=99=E3=82=B9=E3=83=88 = =E3=83=97=E3=83=A9=E3=82=AF=E3=83=86=E3=82=A3=E3=82=B9 =E6=9C=80=E4=BD=B3=E5=AE=9E=E8=B7=B5 =E6=9C=80=E4=BD=B3=E5=AF=A6=E5=8B=99

Web Applications

Appendix Anhang Ap=C3=A9ndice=20 Annexes Appendice =E4=BB=98=E9=8C=B2 =E9=99=84=E5=BD=95 =E9=99=84=E9=8C=84