CODEWITHSUNDEEP
androidlogcat
Niro
Niro

Reputation: 23

read logcat from app in real time

I want to read logcat from an app(and screen for a specific string in the logs). BUT everything I've tried so far causes the app to stop(button looks pressed, keyboard does nothing) any ideas? this is my code so far(copied it from the internet):

try {
    Runtime.getRuntime().exec("su").waitFor();
    Runtime.getRuntime().exec("logcat -c").waitFor();

    Process process = Runtime.getRuntime().exec("logcat");
    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
    String line = "";
    while ((line = bufferedReader.readLine()) != null) {
        if(line.contains(s)){
            Toast.makeText(MainActivity.this, "found S!", Toast.LENGTH_SHORT).show();
            break;
        }
    }
}catch (IOException e) {}

Upvotes: 1

Views: 3449

Answers (2)

PageNotFound
PageNotFound

Reputation: 2320

You can run logcat and read the log in a service.

See logdog, I use it to read the logcat, it works fine.

Simple example:

/* put these code in onCreate() of a service */
Process process = Runtime.getRuntime().exec("su");
BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
DataOutputStream dos = new DataOutputStream(process.getOutputStream());
dos.writeBytes("logcat -b events -v time\n");
dos.flush();

/* read log, put these code out of onCreate() in service and periodically call this code */
while (reader.ready()) {
    line = reader.readLine();
    //handle the log
}

Upvotes: 0

konmik
konmik

Reputation: 3210

Try this code:

    log = (TextView)findViewById(R.id.log);
    logContainer = (ScrollView)findViewById(R.id.logContainer);

        new AsyncTask<Void, String, Void>() {

            @Override
            protected Void doInBackground(Void... params) {
                try {
                    Process process = Runtime.getRuntime().exec("logcat");
                    BufferedReader bufferedReader = new BufferedReader(
                        new InputStreamReader(process.getInputStream()));

                    String line = "";
                    while ((line = bufferedReader.readLine()) != null) {
                        if (line.contains("<<<<<<<<YOUR TAG>>>>>>>>"))
                            publishProgress(line);
                    }
                }
                catch (IOException e) {
                }
                return null;
            }

            @Override
            protected void onProgressUpdate(String... values) {
                log.append(values[0] + "\n");
                logContainer.post(new Runnable() {
                    @Override
                    public void run() {
                        logContainer.fullScroll(View.FOCUS_DOWN);
                    }
                });
            }
        }.execute();

Upvotes: 3

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