logback-android/src/main/java/ch/qos/logback/core/util/OptionHelper.java
public static String getAndroidSystemProperty(String key) {
    try {
      return SystemPropertiesProxy.getInstance().get(key, null);
    } catch (IllegalArgumentException e) {
      return null;
    }
  }
public static String getAndroidSystemProperty(String key) {
    try {
      return SystemPropertiesProxy.getInstance().get(key, null);
    } catch (IllegalArgumentException e) {
      return null;
    }
  }
Gets an Android system property

@param key The key to search for
@return the string value of the system property