Read logcat from app not working correctly

Question

I am trying to read from the logcat output in my app. I am able to read in correctly, but it goes on reading it in endless loop. Somehow there seems no way to detect the end of stream.

Not sure what I am doing wrong.

Here is my code:

    String baseCommand = "logcat -v time MyTag:D *:S";

    Process process = null;
    try {
        process = Runtime.getRuntime().exec(baseCommand);
        InputStreamReader reader = new InputStreamReader(process.getInputStream());
        BufferedReader bufferedReader = new BufferedReader(reader);
        String line;
        while ((line = bufferedReader.readLine()) != null) {
            Log.d("SomeOtherTag", line); //This line executes endlessly
        }
    } catch (IOException e) {
        Log.e(DEBUG_TAG, "error in logging");
        e.printStackTrace();
    }

Dalenedalenna

Answer 1

Not positive but I believe you need to pass the logcat call if it has args in a String[] so it would be something like

String[] baseCommand = {"logcat", "-v", "time", "MyTag:D", "*:S"};

then the rest of your code.

The single string call is just the program name, not the args.

Idealism

Thanks for letting me know about the overloaded method. However, even with this, the program just seems to hang after the lines are written out. – Dalenedalenna

The only other thing I can think of is maybe store the logs in a list until you reach the end, close the stream and print out the list? I have pretty similar code and it works for me. Could you somehow be adding more logs to print while printing them out to Log.d? – Idealism

I don't think so. The tag is different. It seems to me , after printing what it's got, the readline() just sits there listening to logcat... – Dalenedalenna

Answer 2

Logcat doesn't exit so the buffer is blocked.

Use 'logcat -d' in order to dump the log and then exit.

Hope this still helps, Yaron

Bushcraft