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Disable USB port

7/3/2015

3 Comments

 
Possible solution to disable USB port if your device has one and you need security...Find the device file for your port, mine is shown below, and run the following 2 commands

#cd /sys/devices/platform/fsl-ehci.0/usb1/
#echo 0 > authorized


To ENABLE the USB port...
#cd /sys/devices/platform/fsl-ehci.0/usb1/

#echo 1 > authorized 


appears to successfully toggle it back ON/Enabled...also, disabling USB access by the method above appears to NOT persist through a reboot so this likely would need to be part of a script run by your app or part of your app if you need to maintain a disabled port for the sake of security

USB Disable/Enable method described here also appears to work on USB mass storage (thumb drive) - i.e. when disabled, the "udisk" folder shows up empty in ESFileExplorer

This has only been proven in concept by trying from a shell session.

3 Comments

Hiding the Android system UI

7/2/2015

0 Comments

 
To hide/show the UI from with your app...
After a lot of searching on the internet, I managed to get the System Bar to hide and appear in a 4.2 device using the commands below
To Hide:

Runtime.getRuntime().exec("service call activity 42 s16 com.android.systemui");
Or use 79 instead of 42 for API less than 14.

To Show:

Runtime.getRuntime().exec("am startservice --user 0 -n com.android.systemui/.SystemUIService");


0 Comments

Extracting manifest info from an APK file

7/2/2015

1 Comment

 
If you ever need to extract information from a APK's manifest file (e.g. to get the name of the launch activity),

You can use Android application packaging tool (AAPT) found under the build-tools folder under your Android SDK installation

$ aapt dump --values xmltree <name>.apk AndroidManifest.xml

and then you have to parse the output to find needed info. The output is a little "rough" but usable.

The parts in bold above are fixed/required.  The "<name>.apk" is the name of the APK file from which you're extracting the manifest.

You probably want to redirect the output to a local file to have for future reference, since the line above just outputs to the screen.  So...for example

C:\Eclipse_ADT\adt-bundle-windows-x86_64-20140702\sdk\build-tools\17.0.0> aapt dump --values xmltree <app-name>.apk AndroidManifest.xml > C:\temp\app-name_Manifest.txt


1 Comment

Background

7/2/2015

1 Comment

 
Picture
Unless stated otherwise, everything discussed herein is related to development I've done on semi custom hardware, (Freescale-based, derived from a FS reference platform) with a rooted BSP/OS (also based on a Freescale reference build).  I have not built the BSP (nor have I ever built a BSP)
1 Comment
    Picture

    Unless stated otherwise, everything discussed herein is related to development I've done on semi custom hardware, (Freescale-based, derived from a FS reference platform) with a rooted BSP/OS (also based on a Freescale reference build).  I have not built the BSP (nor have I ever built a BSP)

    Author

    John Goluch has been a software developer since 1989. He has developed code for a variety of embedded systems in Assembly and C, for the web in HTML/JS/PHP, and mobile devices in Qt/C++ and Android/Java.  Content here comes from "in the weeds" level of research and discovery related to Android development

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