public void Save() {
String numkey = "sign-amount";
String signprefix = "sign-";
// clear properties file
int num = mPropertiesFile.getInt(numkey, 0);
for (int i = 0; i < num; ++i) {
mPropertiesFile.removeKey(signprefix + i);
}
// save
num = mSensorList.size();
mPropertiesFile.setInt(numkey, num);
for (int i = 0; i < mSensorList.size(); ++i) {
mPropertiesFile.setString(signprefix + i, mSensorList.get(i).serialize());
}
}
