Android – Obtain root access via su on the Android emulator

androidandroid-emulator

I need to get root access via su to lunch a TcpDump binary (I am working on a sort of android sniffer). I use this code :

try {
    Process process = Runtime.getRuntime().exec("su");
    DataOutputStream os = new DataOutputStream(process.getOutputStream());
    os = new DataOutputStream(process.getOutputStream());
    os.writeBytes("/data/local/tcpdump-arm -c 10 -s 0 -w /data/local/out.txt\n");
    os.writeBytes("exit\n");
    os.flush();
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

It works perfectly on a rooted phone, but I want to achieve this in the emulator.
By default you can't get root privileges via su on the emulator (although it's possible via adb shell).

I have found this post

But it doesn't work for me. I read somewhere this tip wont work with the curent revision of the sdk, but it doesn't say with which it will work.
I try with sdk revision 10 and the avd run Android 2.1.

Best Answer

Ok, I solve the problem by myself :/

It works with sdk revision 10 and in an avd 2.2. The problem with the tip I have followed previously is the remount step. Here is the list of commands working for me (extract from http://forum.xda-developers.com/showthread.php?t=821742) :

adb shell mount -o rw,remount -t yaffs2 /dev/block/mtdblock03 /system
adb push su /system/xbin/su
adb shell chmod 06755 /system
adb shell chmod 06755 /system/xbin/su
adb install superuser.apk

You can get the su binary and the superuser app here : http://forum.xda-developers.com/showthread.php?t=682828

You have to do that each time you start the emulator.

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You can force Android to hide the virtual keyboard using the InputMethodManager, calling hideSoftInputFromWindow, passing in the token of the window containing your focused view.

// Check if no view has focus:
View view = this.getCurrentFocus();
if (view != null) {  
    InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
    imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
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This will force the keyboard to be hidden in all situations. In some cases, you will want to pass in InputMethodManager.HIDE_IMPLICIT_ONLY as the second parameter to ensure you only hide the keyboard when the user didn't explicitly force it to appear (by holding down the menu).

Note: If you want to do this in Kotlin, use: context?.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager

Kotlin Syntax

// Only runs if there is a view that is currently focused
this.currentFocus?.let { view ->
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You can connect to the Emulator via Telnet. You then have a Emulator console that lets you enter certain data like geo fixes, network etc.

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I found this site useful for finding a realistic lat/lng: http://itouchmap.com/latlong.html

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Best Answer

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