For those who cant wait for merge of https://github.com/JakeWharton/timber/pull/106

DebugTreeWithCodeLink.java

import timber.log.Timber;

public class DebugTreeWithCodeLink extends Timber.DebugTree {

    private final ThreadLocal<String> codeLink = new ThreadLocal<>();
    private static final int CALL_STACK_INDEX = 5;

    @Override
    protected String createStackElementTag(StackTraceElement element) {
        codeLink.set(createCodeLink(element));
        return super.createStackElementTag(element);
    }

    private String createCodeLink(StackTraceElement element) {
        int lineNumber = element.getLineNumber();
        if (lineNumber > 0) {
            return String.format(" (%s:%s)", element.getFileName(), lineNumber);
        }
        return "";
    }

    private String createCodeLink(StackTraceElement[] stackTrace) {
        if (stackTrace.length <= CALL_STACK_INDEX) {
            throw new IllegalStateException(
                    "Synthetic stacktrace didn't have enough elements: are you using proguard?");
        }
        return createCodeLink(stackTrace[CALL_STACK_INDEX]);
    }

    @Override
    protected void log(int priority, String tag, String message, Throwable t) {
        String codeLinkStr = codeLink.get();
        if (codeLinkStr == null) {
            codeLinkStr = createCodeLink(new Throwable().getStackTrace());
        } else {
            codeLink.set(null);
        }
        super.log(priority, tag, message + codeLinkStr, t);
    }
}