How to print stacktrace for an exception Android on external file?

Question

I want to print the stack (after an error in an exception block, try catch), but I wanna print all in an external file (.txt), file that I can take somewhere in the android folders.

Thanks in advance

Recommended: use a logger library (like SL4FJ). Alternatively you can write the stacktrace to a file yourself like writing any other string. — m0skit0, May 08 '17 at 16:42
Also, probably look at [this answer](http://stackoverflow.com/a/12053112/1450348) — manman, May 08 '17 at 16:43

score 0 · Answer 1 · answered May 08 '17 at 16:44

0

Open/declare a PrintWriter to write to your file and change your catch block to:

catch(Exception e) {
    e.printStackTrace(your_print_writer);
}

answered May 08 '17 at 16:44

Deepesh Choudhary

660
1
8
17

score 0 · Answer 2 · answered May 08 '17 at 16:44

Well, that could be a problem, but it's totally doable:

try {
    badMethod();
} catch(SomeException e) {
    try (FileWriter writer = new FileWriter("file.txt")) {
        e.printStackTrace(writer);
    } catch(IOException ioexception) {
        // do something here
    }
}

score 0 · Answer 3 · answered May 08 '17 at 16:44

0

There are a lot of ways to do that, but maybe the easiest is to redirect System.err to your desired file an then simply call Exception.printStackTrace();

To redirect standard error output:

PrintStream ps = new PrintStream("./errors.txt");
System.setErr(ps);

and then...

catch(Exception e) {
    e.printStackTrace();
}

answered May 08 '17 at 16:44

LuisGP

431
3
13

You can specify any file path you wish. In this case, the file will be in the current directory, that typically is the one from which your app is running. You can see it with any text viewer. In android I use ES File Explorer suite. – LuisGP May 08 '17 at 20:05
Did I resolve your question? If yes, please, consider mark as the answer. – LuisGP May 19 '17 at 11:01

Omar Aflak · Answer 4 · 2017-05-08T16:59:33.910

-1

You can do it this way :

try{
    // action
} catch (IOException e) {
    PrintWriter writer = new PrintWriter("stacktrace.txt");
    e.printStackTrace(writer);
    writer.close();
}

edited May 08 '17 at 16:59

answered May 08 '17 at 16:42

Omar Aflak

2,918
21
39

ok and how i can take the file "stacktrace.txt" (for see it)? – Umberto Di Canito May 08 '17 at 16:44
1

@UmbertoDiCanito A file explorer? – m0skit0 May 08 '17 at 16:45

How to print stacktrace for an exception Android on external file?

4 Answers4