logback-android/src/main/java/ch/qos/logback/core/spi/AppenderAttachableImpl.java
public int appendLoopOnAppenders(E e) {
    int size = 0;
    final Appender<E>[] appenderArray = appenderList.asTypedArray();
    final int len = appenderArray.length;
    for (int i = 0; i < len; i++) {
      appenderArray[i].doAppend(e);
      size++;
    }
    return size;
  }
public int appendLoopOnAppenders(E e) {
    int size = 0;
    final Appender<E>[] appenderArray = appenderList.asTypedArray();
    final int len = appenderArray.length;
    for (int i = 0; i < len; i++) {
      appenderArray[i].doAppend(e);
      size++;
    }
    return size;
  }
Call the <code>doAppend</code> method on all attached appenders.