PreferencesActivity.java 文件源码

private void disableLastCheckedPref()
{
    Collection<CheckBoxPreference> checked = new ArrayList<CheckBoxPreference>(3);
    if (decode1D.isChecked())
    {
        checked.add(decode1D);
    }
    if (decodeQR.isChecked())
    {
        checked.add(decodeQR);
    }
    if (decodeDataMatrix.isChecked())
    {
        checked.add(decodeDataMatrix);
    }
    boolean disable = checked.size() < 2;
    for (CheckBoxPreference pref : new CheckBoxPreference[]
    { decode1D, decodeQR, decodeDataMatrix })
    {
        pref.setEnabled(!(disable && checked.contains(pref)));
    }
}