Dalvik Debug Monitor Service

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Android Device Monitor was deprecated in Android Studio3.1 and removed from Android Studio 3.2. The features that you could usethrough the Android Device Monitor have been replaced by new features. The tablebelow helps you decide which features you should use instead of these deprecatedand removed features.

  1. Dalvik Debug Monitor Server Ddms
  2. Dalvik Debug Monitor Service
  3. Dalvik Debug Monitor Server
  4. Dalvik Debug Monitor Service Manual

Dalvik is the name of Android’s virtual machine. The Dalvik VM is an interpreter-only virtual machine that executes files in the Dalvik Executable (.dex) format. The virtual machine is register-based and can run classes compiled by Java language compiler that have been altered into its native format using the included ‘dx’ tool. Android ships a debugging tool, Dalvik Debug Monitor Service (DDMS). This tool provides additional services such as port-forwarding services, screen capture on device, incoming call and SMS spoofing etc. When DDMS starts, it connects to adb. A VM monitoring service is created between adb and DDMS, when a device is connected.

  1. Android ships with a debugging tool called the Dalvik Debug Monitor Service (DDMS), which provides port-forwarding services, screen capture on the device, thread and heap information on the device, logcat, process, and radio state information, incoming call and SMS spoofing, location data spoofing, and more.
  2. Dalvik Debug Monitor Service (DDMS) lets us explore what possible problems our Android application might have. In this short post we will explore the following potential problematic areas: file explorer; logcat; traceview; hierarchy view; To open the DDMS eclipse view, we need to do the following.
  3. The Dalvik Debug Monitor Service (DDMS) is a debugging tool used in the Android platform. The Dalvik Debug Monitor Service is downloaded as part of the Android SDK. Some of the services provided by the DDMS are port forwarding, on-device screen capture, on-device thread and heap monitoring, and radio state information. Click to see full answer.

Android Device Monitor componentWhat you should useDalvik Debug Monitor Server (DDMS)

This tool is deprecated. Instead, use Android Profiler in Android Studio 3.0 and higher to profile your app’s CPU, memory, and network usage.

If you want to perform other debugging tasks, such as sending commands to a connected device to set up port-forwarding, transfer files, or take screenshots, then use the Android Debug Bridge (adb), Android Emulator, Device File Explorer, or Debugger window.

Traceview

This tool is deprecated. To inspect .trace files captured by instrumenting your app with the Debug class, record new method traces, export .trace files, and inspect real-time CPU usage of your app's processes, use the Android Studio CPU profiler.

Systrace

If you need to inspect native system processes and address UI jank caused by dropped frames, use systrace from the command line or the simplified System Trace in the CPU Profiler. The CPU Profiler provides many features for profiling your app's processes.

Tracer for OpenGL ESUse the Android GPU Inspector. Hierarchy Viewer

If you want to inspect your app’s view hierarchy at runtime, use Layout Inspector.

If you want to profile the rendering speed of your app’s layout, use Window.OnFrameMetricsAvailableListener as described in this blog post.

Pixel PerfectUse Layout Inspector.Network Traffic tool

If you need to view how and when your app transfers data over a network, use the Network Profiler.

To start the standalone Device Monitor application in Android Studio 3.1 andlower, enter the following on the command line in theandroid-sdk/tools/ directory:

You can then link the tool to a connected device by selecting the device from the Devices pane. If you have trouble viewing panes or windows, select Window > Reset Perspective from the menu bar.

Note: Each device can be attached to only one debugger process at a time. So, for example, if you are using Android Studio to debug your app on a device, you need to disconnect the Android Studio debugger from the device before you attach a debugger process from the Android Device Monitor.

Android ships with a debugging tool called the Dalvik Debug Monitor Server (DDMS), which provides port-forwarding services, screen capture on the device, thread and heap information on the device, logcat, process, and radio state information, incoming call and SMS spoofing, location data spoofing, and more. This page provides a modest discussion of DDMS features; it is not an exhaustive exploration of all the features and capabilities.

DDMS ships in the tools/ directory of the SDK. Enter this directory from a terminal/console and type ddms (or ./ddms on Mac/Linux) to run it. DDMS will work with both the emulator and a connected device. If both are connected and running simultaneously, DDMS defaults to the emulator.

DDMS acts as a middleman to connect the IDE to the applications running onthe device. On Android, every application runs in its own process, each of which hosts its own virtual machine (VM). And each processlistens for a debugger on a different port.

When it starts, DDMS connects to adb and starts a device monitoring service between the two, which will notify DDMS when a device isconnected or disconnected. When a device is connected, a VM monitoring service is createdbetween adb and DDMS, which will notify DDMS when a VM on the device is started or terminated. Once a VM is running, DDMS retrieves the the VM’s process ID (pid), via adb,and opens a connection to the VM’s debugger, through the adb daemon (adbd) on the device. DDMS can now talk to the VM using a custom wire protocol.

For each VM on the device, DDMS opens a port upon which it will listen for a debugger. For the first VM, DDMS listens for a debugger on port 8600, the next on 8601, and so on. When a debugger connects to one of these ports, all traffic is forwarded between the debugger and the associated VM. Debugging can then process like any remote debugging session.

DDMS also opens another local port, the DDMS ‘base port’ (8700, by default), upon which it also listens for a debugger. When a debugger connects to this base port, all traffic is forwarded to the VM currently selected in DDMS, so this is typically where you debugger should connect.

For more information on port-forwarding with DDMS,read Configuring your IDE to attachto port 8700 for debugging.

Tip:You can set a number of DDMS preferences in File >Preferences.Preferences are saved to ‘$HOME/.ddmsrc’.

Known debugging issues with Dalvik
Debugging an application in the Dalvik VM should work the same as it doesin other VMs. However, when single-stepping out of synchronized code, the ‘current line’cursor may jump to the last line in the method for one step.

The left side of the Debug Monitor shows each emulator/device currently found, with a list of all the VMs currently running within each. VMs are identified by the package name of the application it hosts.

Use this list to find and attach to the VM running the activity(ies) that you want to debug. Next to each VM in the list is a ‘debugger pass-through’ port (in the right-most column). If you connect your debugger to one of the the ports listed, you will be connected to the corresponding VM on the device. However, when using DDMS, you need only connect to port 8700, as DDMS forwards all traffic here to the currently selected VM. (Notice, as you select a VM in the list, the listed port includes 8700.) This way, there’s no need to reconfigure the debugger’s port each time you switch between VMs.

When an application running on the device calls waitForDebugger() (or you select this option in the developer options), a red icon will be shown next to the client name, while it waits for the debugger to attach to the VM. When a debugger is connected, the icon will turn green.

If you see a crossed-out bug icon, this means that the DDMS was unable to complete a connection between the debugger and the VM because it was unable to open the VM’s local port.If you see this for all VMs on the device, it is likely because you have another instance ofDDMS running (this includes the Eclipse plugin).

If you see a question mark in place of an application package, this means that, once DDMS received the application pid from adb, itsomehow failed to make a successful handshake with the VM process. Try restarting DDMS.

On the right side, the Debug Monitor provides tabs that display useful information and some pretty cool tools.

This view shows some general information about the selected VM, including the process ID, package name, and VM version.

The threads view has a list of threads running in the process of the target VM. To reduce the amount of data sent over the wire, the thread updates are only sent when explicitly enabled by toggling the ‘threads’ button in the toolbar. This toggle is maintained per VM. This tab includes the following information:

  • ID — a VM-assigned unique thread ID. In Dalvik, these are odd numbers starting from 3.
  • Tid — the Linux thread ID. For the main thread in a process, this will match the process ID.
  • Status — the VM thread status. Daemon threads are shown with an asterisk (*). This will be one of the following:
  • running — executing application code
  • sleeping — called Thread.sleep()
  • monitor — waiting to acquire a monitor lock
  • wait — in Object.wait()
  • native — executing native code
  • vmwait — waiting on a VM resource
  • zombie — thread is in the process of dying
  • init — thread is initializing (you shouldn’t see this)
  • starting — thread is about to start (you shouldn’t see this either)
  • utime — cumulative time spent executing user code, in ‘jiffies’ (usually 10ms).
  • stime — cumulative time spent executing system code, in ‘jiffies’ (usually 10ms).
  • Name — the name of the thread

‘ID’ and ‘Name’ are set when the thread is started. The remaining fields are updated periodically (default is every 4 seconds).

Displays some heap stats, updated during garbage collection. If, when a VM is selected,the VM Heap view says that heap updates are not enabled, click the ‘Show heap updates’ button, located in the top-left toolbar. Back in the VM Heap view, click Cause GC to perform garbage collection and update the heap stats.

In this view, you can track the memory allocation of each virtual machine.With a VM selected in the left pane, click Start Tracking, then Get Allocations to view all allocations since tracking started. The table below will be filled with all the relevantdata. Click it again to refresh the list.

With these controls, you can simulate special device states and activities.Features include:

  • Telephony Status — change the state of the phone’s Voice and Data plans (home, roaming, searching, etc.), and simulate different kinds of network Speed and Latency (GPRS, EDGE, UTMS, etc.).
  • Telephony Actions — perform simulated phone calls and SMS messages to the emulator.
  • Location Controls — send mock location data to the emulator so that you can perform location-aware operations like GPS mapping.
  • To use the Location Controls, launch your application in the Android emulator and open DDMS. Click the Emulator Controls tab and scroll down to Location Controls.From here, you can:
  • Manually send individual longitude/latitude coordinates to the device.
  • Click Manual, select the coordinate format, fill in the fields and click Send.
  • Use a GPX file describing a route for playback to the device.
  • Click GPX and load the file. Once loaded, click the play button to playback the route for your location-aware application.
  • When performing playback from GPX, you can adjust the speed of playback from the DDMS panel and control playback with the pause and skip buttons. DDMS will parse both the waypoints (<wpt>, in the first table), and the tracks (<trk>, in the second table, with support for multiple segments, <trkseg>, although they are simply concatenated). Only the tracks can be played. Clicking a waypoint in the first list simply sends its coordinate to the device, while selecting a track lets you play it.
  • Use a KML file describing individual placemarks for sequenced playback to the device.
  • Click KML and load the file. Once loaded, click the play button to send the coordinates to your location-aware application.
  • When using a KML file, it is parsed for a <coordinates> element. The value of which should be a single set of longitude, latitude and altitude figures. For example:
  • In your file, you may include multiple <Placemark> elements, each containing a <coordinates> element. When you do so, the collection of placemarks will be added as tracks. DDMS will send one placemark per second to the device.
  • One way to generate a suitable KML file is to find a location in Google Earth. Right-click the location entry that appears on the left and select ‘Save place as…’ with the save format set to Kml.
  • Note: DDMS does not support routes created with the <MultiGeometry><LineString>lat1, long1, lat2, long2, ....</LineString></MultiGeometry> methods. There is also currently no support for the <TimeStamp> node inside the <Placemark>. Future releases may support timed placement and routes within a single coordinate element.
  • For additional methods of setting up mocks of location-based data, see the Location topic.
Dalvik debug monitor service (ddms) does not provide
Dalvik debug monitor service (ddms) does not provide

With the File Explorer, you can view the device file system and perform basic management, like pushing and pulling files. This circumvents using the adbpush and pull commands, with a GUI experience.

With DDMS open, select Device >File Explorer… to open theFile Explorer window. You can drag-and-drop into the device directories, but cannot drag out of them.To copy files from the device, select the file and click the Pull File from Devicebutton in the toolbar. To delete files, use the Delete button in the toolbar.

If you’re interested in using an SD card image on the emulator, you’re still required to usethe mksdcard command to create an image, and then mount it during emulator bootup. For example, from the /tools directory, execute:

Now, when the emulator is running, the DDMS File Explorer will be able to read and write to the sdcard directory. However, your files may not appear automatically. For example, if you add anMP3 file to the sdcard, the media player won’t see them until you restart the emulator. (When restartingthe emulator from command line, be sure to mount the sdcard again.)

For more information on creating an SD card image, see the Other Tools document.

Dalvik Debug Monitor Service
Dalvik Debug Monitor Service

You can capture screen images on the device or emulator by selecting Device > Screen capture… in the menu bar, or press CTRL-S. Be sure to select a device first.

Center

You can see the output of ps -x for a specific VM by selecting Device > Show process status... in the menu bar.

Cause garbage collection to occur in the selected application by pressing the trash can button on the toolbar.

  • To run dumpsys (logcat) from Dalvik, select Device > Run logcat… in the menu bar.
  • To run dumpstate from Dalvik, select Device > Dump device state… in the menu bar.

By default, radio state is not output during a standard logcat (it is a lot of information). To see radio information, either click Device > Dump radio state… or run logcat as described in Logging Radio Information.

You can stop a virtual machine by selecting Actions > HaltVM. Pressing this button causes the VM to call Runtime.halt(1).

DDMS has the following known limitations:

  • If you connect and disconnect a debugger, ddms drops and reconnects the client so the VM realizes that the debugger has gone away. This will be fixed eventually.

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