private static StackTraceElement[] getRealStackTrack(StackTraceElement[] stackTrace,
                                                         String stackTraceOrigin) {
        int ignoreDepth = 0;
        int allDepth = stackTrace.length;
        String className;
        for (int i = allDepth - 1; i >= 0; i--) {
            className = stackTrace[i].getClassName();
            if (className.startsWith(XLOG_STACK_TRACE_ORIGIN)
                    || (stackTraceOrigin != null && className.startsWith(stackTraceOrigin))) {
                ignoreDepth = i + 1;
                break;
            }
        }
        int realDepth = allDepth - ignoreDepth;
        StackTraceElement[] realStack = new StackTraceElement[realDepth];
        System.arraycopy(stackTrace, ignoreDepth, realStack, 0, realDepth);
        return realStack;
    }
Get the real stack trace, all elements that come from XLog library would be dropped.

@param stackTrace the full stack trace
@return the real stack trace, all elements come from system and library user
android/android_framework/base/src/main/java/com/elvishew/xlog/internal/util/StackTraceUtil.java