Basic knowledge of DDMS (Dalvik Debug Monitor Service) Practical with DDMS

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Android Code Optimization
Techniques
(Session 3)
15/12/2014

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AGENDA
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 Basic knowledge of DDMS (Dalvik Debug Monitor Service)
 Practical with DDMS

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/01/
Basics of DDMS

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BASICS OF DDMS
CONFIDENTIAL / February 2014 / CEE - CC India
 This is very very useful to the app developers
 Its is a very powerful debugging tool environment and offers various unparalleled debugging features
 heap information
 logcat monitoring
 file manager
 Etc.
 It is available by default in ECLIPSE IDE environment or even in the ANDROID SDK

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/02/
HOW TO USE DDMS ??

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HOW TO USE DDMS ??
 As explained, install android sdk....After you have installed platform-tools & sdk tools.Now go to
android folder and open tools
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/03/
Now let's learn about its
components and it's use's

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DDMS VIEW COMPONENT'S :-
 DEVICES :-
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The device panel shows the
details of each process that
are running in the connected
device.
There are various operations
that can be performed from
this panel.

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ICONS
 Each of the icons present in this panel performs the functions as follow's :
 Debug Process Icon :- It show's the state of connection of the debugger.
 Update Heap :-Clicking on this enables Heap information for the process so that we do not have to do
memory deallocation manually.
 Dump HPROF :- Generates a Heap Dump , useful for tracing memory leaks in your app.
 Cause GC :-Invokes the Garbage collector to collect heap data.
 Update thread :-Show's the information about the running thread in the thread tad for selected process
 Start Method Profiling :- Tracks the metric's related a method. It collects information like the amount of time
taken to execute a method, number of calls.
 Stop Process :-Stops the currently selected process.
 Screen Capture :- Takes a screenshot of whatever
 is displayed on the screen.
 Reset ADB :- As the name suggest, it resets ADB.
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THREAD'S
 The thread tab on the right of devices view shows informatiom related to the
thread for each process selected in the devices view.The information shown can
described as follows.
 ID :- A unique ID assigned to each thread dby Dalvik V,, which are only odd
numbers that start from 3 .
 Tid :-The linux thread associated with each thread , ehich matches the process
ID for each main thread in a process.
 Status :- Status of the thread in VM , out of daemons are marked with an
asterix.other values can be among running?sleeping/init/starting.
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HEAP
 the heap view show a information and statistics about memory heap .To view heap usage,follow
these below steps
1. From the devices view, select the process for heap usage which has to be examined.
2. click on update heap
3. From heap Tab , select Cause GC to enable collecting heap data
 Every time you need to update your heap statistics. This will show you the amount of memory
allocated to each
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ALLOCATION TRACKER
 The allocation Tracker show a real time information about allocation happening in the application
over a certain period of time. To enable allocation Tracking.
1. select the process to be tracked from device panel
2. click on start tracking from allocation tracker tab.
3. perform any actions on the devices or emulator that you want to be tracked.
4. click on Get Allocations objects, since tracking was enabled .
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NETWORK STATISTICS
 The network tab allows you to track and optimize the amount of network data
your app is using. It even allows you to tag network sockets so that you can
differentiate between types of data .It will indicate the speed and amount of data
received /transmitted.
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EMULATOR CONTROL :-
 One problem with testing Android devices using an emulator or developer device
is the fact that it is unable to examine the performance of the app in the real
world conditions . like call or SMS is received/sent or when a particular location
is reached. To be specific the emulator Tab allows you to emulate the following
real world conditions :
Telephony Status :- the following options are available to set the status of phones network.
Voice :- unregistered,home,roaming,searching,denied.
Data :- unregistered,home,roaming,searching,denied.
Speed :- Full,GSM,HSCSD,GPRS,EDGE,UMTS,HSDPA.
Latency :- GPRS,UMTS
Telephony Actions :- Telephony actions allow you to spoof the network.
Location Settings ;- Emulator control allows you to sppof the location
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FILE EXPLORER
 As the name says it lets you view the directory and file structure if the device and lso easily copy files
to and from the emulator so as to enable easy data transfer in a manner similiar to ADB or ADB pull
command.
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SYSTEM INFORMATION
 As the name says , it give's us the particular information about the GPU load , CPU load....
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DDMS HAS ALSO AN INBUILT LOGCAT VIEWER
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• http://forum.xda-
developers.com/showthread.php?t=2303834
• http://www.edumobile.org/android/android-tutorial/what-is-
ddms-and-how-it-works/
References

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Next session
Android Studio - An official IDE for
Android By Google.
Thank you