Android Download Manager save to /system

Question

I'm just playing around with Android Studio and I'm trying to figure out how to Download a file into /system.

I understand I need root for this and I already got that part working, the only trouble I'm having is with

request.setDestinationInExternalPublicDir("/system/", "test.jpg");

The goal is to download a file and save it to /system with the file name being test.jpg.

So the end is the file is located at /system/test.jpg.

The issue with this is that DownloadManager is saving it to internal storage and is creating a new folder named 'system'.

I can tell it has something to do with setDestinationInExternalPublicDir but I'm just not sure what to change it to.

Thanks again

you need to recompile android from android source ... seriously, guess what `InExternalPublicDir` means in the method name ... and then just think is `/system/` an `ExternalPublicDir` ... obviously you should save the file somewhere and then copy/move to `/system/` (of course copy/move as root) — Selvin, Feb 04 '16 at 10:51

score 0 · Answer 1 · edited May 23 '17 at 12:31

What I did is that:
(It's a part in one of my projects)

/*****DOWNLOAD FILE*****/
DownloadManager.Request request = new DownloadManager.Request(Uri.parse("https://github.com/pelya/android-keyboard-gadget/blob/master/hid-gadget-test/hid-gadget-test?raw=true"));
request.setDescription("hid-gadget-test");
request.setTitle("hid-gadget-test");
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
    request.allowScanningByMediaScanner();
    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE);
}
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "hid-gadget-test"); /*****SAVE TO DOWNLOAD FOLDER*****/


DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
manager.enqueue(request);

File mvfile = new File("/sdcard/"+Environment.DIRECTORY_DOWNLOADS+"/hid-gadget-test");
while (!mvfile.exists()) {}  /*****WAIT UNTIL DOWNLOAD COMPLETE*****/
try {
    Thread.sleep(5000);
} catch (InterruptedException ignored) {}


try {  /*****RUN MV-COMMAND TO MOVE TO ROOT DIR*****/
    Process su = Runtime.getRuntime().exec("su");
    DataOutputStream outputStream = new DataOutputStream(su.getOutputStream());

    outputStream.writeBytes("mv /sdcard/"+Environment.DIRECTORY_DOWNLOADS+"/hid-gadget-test /data/local/tmp/hid-gadget-test\n");
    outputStream.flush();

    outputStream.writeBytes("exit\n");
    outputStream.flush();
    su.waitFor();
} catch (IOException e) {
    Toast.makeText(getApplicationContext(), "IOException", Toast.LENGTH_SHORT).show();
} catch (InterruptedException e) {
    Toast.makeText(getApplicationContext(), "InterruptedException", Toast.LENGTH_SHORT).show();
}

The wait-until-download-complete-thingy is a bit hacky, I found it here. It will maybe not work with files that take more than 5 seconds to download

Android Download Manager save to /system

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