Read realtime output of a command

Question

How can I read real-time output of a shell command from Java

This is what I have so far but it prints after command has been executed:

try {
    proc = Runtime.getRuntime().exec("du -d 1 /sdcard/");

    InputStream inputStream = proc.getInputStream();
    InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
    BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

    while ((line = bufferedReader.readLine()) != null) {
        publishProgress(i);
        i++;
        System.out.println(line); // it prints all at once after command has been executed.
    }
}
catch (IOException e) {
    Log.e("du","error "+e.getMessage());
}

`du` is very fast. Yet ,did you try with ProcessBuilder and Process.start ? — njzk2, Nov 23 '12 at 13:55
@pedja In LogCat you see the output of `Log` methods, not `System.out.println` — sdabet, Nov 23 '12 at 13:56
No. its command `du` from linux. Scans entire folder and display size — pedja, Nov 23 '12 at 13:56
@pedja oh you're talking about the deprecated LogCat view then — sdabet, Nov 23 '12 at 14:00
`System.out.println` isnt the problem. Same happens with updating ui in `onProgressUpdate` — pedja, Nov 23 '12 at 14:05

score 5 · Answer 1 · answered Feb 14 '14 at 08:26

Try this:

try {
 proc = Runtime.getRuntime().exec("du -d 1 /sdcard/");

 InputStream inputStream = proc.getInputStream();
 InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
 BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

 while ((line = bufferedReader.readLine()) != null) {
    System.out.println(line); // it prints all at once after command has been executed.
 }
 proc.waitFor();
}
catch (IOException e) {
 Log.e("du","error "+e.getMessage());
}

Read realtime output of a command

1 Answers1

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