logback-android/src/main/java/ch/qos/logback/core/OutputStreamAppender.java
protected void closeOutputStream() {
    if (this.outputStream != null) {
      try {
        // before closing we have to output out layout's footer
        encoderClose();
        this.outputStream.close();
        this.outputStream = null;
      } catch (IOException e) {
        addStatus(new ErrorStatus(
            "Could not close output stream for OutputStreamAppender.", this, e));
      }
    }
  }
protected void closeOutputStream() {
    if (this.outputStream != null) {
      try {
        // before closing we have to output out layout's footer
        encoderClose();
        this.outputStream.close();
        this.outputStream = null;
      } catch (IOException e) {
        addStatus(new ErrorStatus(
            "Could not close output stream for OutputStreamAppender.", this, e));
      }
    }
  }
Close the underlying {@link OutputStream}.