PrefsFragmentSettings.java 文件源码

void updatePreferenceScreen() {
    PreferenceCategory preferenceCategory = (PreferenceCategory) findPreference("dataSourceType");
    PhoneSensorDataSource phoneSensorDataSource;
    for (int i = 0; i < phoneSensorDataSources.getPhoneSensorDataSources().size(); i++) {
        phoneSensorDataSource = phoneSensorDataSources.getPhoneSensorDataSources().get(i);
        SwitchPreference switchPreference = (SwitchPreference) preferenceCategory.findPreference(phoneSensorDataSource.getDataSourceType());
        switchPreference.setChecked(phoneSensorDataSource.isEnabled());
        if (!isSensorSupported(phoneSensorDataSource.getDataSourceType()))
            switchPreference.setSummary("Not Supported");
        else {
            try {
                switchPreference.setSummary(phoneSensorDataSource.getFrequency() + " Hz");
            } catch (NumberFormatException nfe) {
                switchPreference.setSummary(phoneSensorDataSource.getFrequency());
            }
        }
    }
}