Question

I have a function void log(String s) which prints a message into a TextView adding it to the existing text. Internally it uses a Handle

It does setText(getText().toString() + s) but when the text becomes large the whole UI thread freezes.

Is there a way to quickly put log output (like Log.d) in the UI thread?

Answer 1

Can you just update like this?

handler.post(new Runnable(){
    public void run() {
        setText(...)
    }
});

Or use a StringBuilder for your log messages. The setText(getText()+new log) is really slow.

protected StringBuilder logs = new StringBuilder();

void newLogMessage(String msg) { 
    logs.append(msg);
    setText(logs.toString()); 
}