Execute a shell command programmatically: why it doesn't work?

Question

I'm trying to programmatically execute the new command "ScreenRecorder" kitkat. I just tried this:

suProcess = Runtime.getRuntime().exec("su");
process = Runtime.getRuntime().exec("screenrecord /sdcard/Folder/Example.mp4");

But doesn't work. In the Folder I've the file Example.mp4 but it is empty (0 byte). Why? How can I solve this? Where is the problem? If from terminal emulator I write su and press enter and after write screenrecord /sdcard/Folder/Example.mp4 it works perfectly. Obvisioully I'm running on 4.4.2 and in a rooted terminal.

AmanAroraBB Yes, my device is rooted. Read well my question please. @deviantfan So I should do something like? process = Runtime.getRuntime().exec("su"); process = Runtime.getRuntime().exec("screenrecord /sdcard/Folder/Example.mp4"); — Giovanni Mariotti, Dec 31 '13 at 10:10
If your version of `su` takes a command as arguments (i.e. it works like `sudo`), then you would use `su screenrecord /sdcard/Folder/Example.mp4`. Keep an eye on logcat for failure messages. — fadden, Dec 31 '13 at 16:14

score 1 · Answer 1 · answered Oct 21 '15 at 08:11

Try this

public static void ScreenRecord() throws Exception
    {
        try
        {
            Process su = Runtime.getRuntime().exec("su");
            DataOutputStream outputStream = new DataOutputStream(su.getOutputStream());

            outputStream.writeBytes("screenrecord --time-limit 10 /sdcard/MyVideo.mp4\n");
            outputStream.flush();

            outputStream.writeBytes("exit\n");
            outputStream.flush();
            su.waitFor();
        }
        catch(IOException e)
        {
            throw new Exception(e);
        }catch(InterruptedException e){
            throw new Exception(e);
        }
    }

its not working for AT#SERVINFO command – asiya Sep 27 '16 at 11:35 — asiya, Sep 27 '16 at 11:35

score 0 · Answer 2 · answered Dec 31 '13 at 10:11

0

It doesn't work because it's an emulator and not a normal device. I think this article could help in this case: http://russelldavis.blogspot.com/2011/01/rooting-android-emulator.html

answered Dec 31 '13 at 10:11

XorOrNor

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I'm running the application in Runtime on an Android device, not the emulator. With mean terminal emulator i meant the application available in Google Play Store. – Giovanni Mariotti Dec 31 '13 at 10:14

Execute a shell command programmatically: why it doesn't work?

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