execute shell command from android

Question

I m trying to execute this command from the application emulator terminal  you can find it in google play  in this app i write su and press enter  so write   screenrecord --time-limit 10  sdcard MyVideo mp4   and press again enter and start the recording of the screen using the new function of android kitkat   so  i try to execute the same code from java using this   Process su   Runtime getRuntime   exec  su    Process execute   Runtime getRuntime   exec  screenrecord --time-limit 10  sdcard MyVideo mp4      But don t work because the file is not created  obviously i m running on a rooted device with android kitkat installed  where is the problem  how can i solve  because from terminal emulator works and in Java not

User · Answer

Process p  StringBuffer output   new StringBuffer    try       p   Runtime getRuntime   exec params 0        BufferedReader reader   new BufferedReader              new InputStreamReader p getInputStream          String line           while   line   reader readLine       null            output append line     n            p waitFor             catch  IOException e        e printStackTrace      catch  InterruptedException e        e printStackTrace      String response   output toString    return response

User · Answer

You should grab the standard input of the su process just launched and write down the command there  otherwise you are running the commands with the current UID   Try something like this   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

User · Answer

A modification of the code by  CarloCannas   public static void sudo String   strings        try          Process su   Runtime getRuntime   exec  su            DataOutputStream outputStream   new DataOutputStream su getOutputStream              for  String s   strings                outputStream writeBytes s   n                outputStream flush                       outputStream writeBytes  exit n            outputStream flush            try               su waitFor              catch  InterruptedException e                e printStackTrace                      outputStream close         catch IOException e           e printStackTrace               You are welcome to find a better place for outputStream close     Usage example   private static void suMkdirs String path        if   new File path  isDirectory              sudo  mkdir -p   path             Update  To get the result  the output to stdout   use   public static String sudoForResult String   strings        String res           DataOutputStream outputStream   null      InputStream response   null      try          Process su   Runtime getRuntime   exec  su            outputStream   new DataOutputStream su getOutputStream             response   su getInputStream             for  String s   strings                outputStream writeBytes s   n                outputStream flush                       outputStream writeBytes  exit n            outputStream flush            try               su waitFor              catch  InterruptedException e                e printStackTrace                      res   readFully response         catch  IOException e           e printStackTrace          finally           Closer closeSilently outputStream  response             return res    public static String readFully InputStream is  throws IOException       ByteArrayOutputStream baos   new ByteArrayOutputStream        byte   buffer   new byte 1024       int length   0      while   length   is read buffer      -1            baos write buffer  0  length             return baos toString  UTF-8        The utility to silently close a number of Closeables  So ket may be no Closeable  is   public class Closer      closeAll   public static void closeSilently Object    xs           Note  on Android API levels prior to 19 Socket does not implement Closeable     for  Object x   xs            if  x    null                try                   Log d  closing    x                   if  x instanceof Closeable                          Closeable x  close                      else if  x instanceof Socket                          Socket x  close                      else if  x instanceof DatagramSocket                          DatagramSocket x  close                      else                       Log d  cannot close    x                       throw new RuntimeException  cannot close   x                                   catch  Throwable e                    Log x e

[java] execute shell command from android

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