Printing an InputStream in Logcat

Question

I want to print the InputStream in logcat(for testing/later I will use it), my current code is as follows.

        @Override
        protected Void doInBackground(Void... params) {

            try {

                InputStream in = null;
                int response = -1;

                URL url = new URL(
                        "http://any-website.com/search/users/sports+persons");
                URLConnection conn = null;
                HttpURLConnection httpConn = null;
                conn = url.openConnection();

                if (!(conn instanceof HttpURLConnection))
                    throw new IOException("Not an HTTP connection");

                httpConn = (HttpURLConnection) conn;
                httpConn.setAllowUserInteraction(false);
                httpConn.setInstanceFollowRedirects(true);
                httpConn.setRequestMethod("GET");
                httpConn.connect();

                response = httpConn.getResponseCode();
                if (response == HttpURLConnection.HTTP_OK) {
                    in = httpConn.getInputStream();
                }

                if (in != null) {
                    Log.e(TAG, ">>>>>PRINTING<<<<<");
                    Log.e(TAG, in.toString());
                   // TODO: print 'in' from here
                }
                in.close();
                in = null;



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

            return null;
        }

But I am not able to do this, so please check the code and add/modify the code to do this.

what is your problem, Input Stream coming null? or Log.e doesnt work? — Savas Adar, Jul 06 '12 at 08:14
Read upon this article : http://excid3.com/blog/just-get-to-the-point/ — COD3BOY, Jul 06 '12 at 08:14
possible duplicate of [In Java, how do I read/convert an InputStream to a String?](http://stackoverflow.com/questions/309424/in-java-how-do-i-read-convert-an-inputstream-to-a-string) — Caner, Jul 06 '12 at 08:16
@Caner your link is useful... but surprisingly I havn't get it as a search result when I searched :( — Soumyadip Das, Jul 06 '12 at 08:20

score 14 · Accepted Answer · answered Jul 06 '12 at 08:21

14

String convertStreamToString(java.io.InputStream is) {
    try {
        return new java.util.Scanner(is).useDelimiter("\\A").next();
    } catch (java.util.NoSuchElementException e) {
        return "";
    }
}

And in your code:

                Log.e(TAG, ">>>>>PRINTING<<<<<");
                Log.e(TAG, in.toString());
                Log.e(TAG, convertStreamToString(in));

answered Jul 06 '12 at 08:21

Caner

57,267
35
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maybe this solution may be helpful for somebody: http://shomeser.blogspot.com/2013/12/redirect-stream-to-logcat.html – Oleksii K. Dec 23 '13 at 11:29

score 0 · Answer 2 · answered Jul 06 '12 at 08:15

0

Your TAG should be a constant like:

public final String TAG = YourActivity.class.getSimpleName();

Then you would do something like:

Log.e(TAG, "You're message here:", e)

e is your error from print stack.

You also want to make sure you import the Log in the Android library.

Also, after looking at your code, you might want to surround your httpConnection() with try/catch statement, that way you can catch the error, and put it in your Log file. You have the Log printing if your stream has something, or isn't null, but you want to know if you don't have a connection, and that would give you a null value.

Hope that helps.

answered Jul 06 '12 at 08:15

BlackHatSamurai

23,275
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oh... i just missed that, so i want to edit the part. actually that's not the problem... – Soumyadip Das Jul 06 '12 at 08:16
Does this answer the question? and also to add, in Log I usually use `e.getmessage()` – COD3BOY Jul 06 '12 at 08:21

score 0 · Answer 3 · answered Jul 06 '12 at 08:17

0

Just add this code to if(in != null):   

    byte[] reqBuffer = new byte[1024];
    int reqLen = 1024;
    int read = -1;

    StringBuilder result = new StringBuilder();
    try {
        while ((read = is.read(reqBuffer, 0, reqLen)) >= 0)
            result.append(new String(reqBuffer, 0, read));
    } catch (IOException e) {
        e.printStackTrace();
    } 


Log.d("TAG", result.toString());

answered Jul 06 '12 at 08:17

Tamara

275
1
10

nothing happened... let me check again, if unsuccessful then I will call you again – Soumyadip Das Jul 06 '12 at 08:24
please make sure in != null, logcat is printing d logs and result != "". This code always worked for me – Tamara Jul 06 '12 at 08:26

Printing an InputStream in Logcat

3 Answers3