SettingsFragment.java 文件源码

private void updateNumberOfPacketsSummary() {
    final PreferenceScreen screen = getPreferenceScreen();
    final SharedPreferences preferences = getPreferenceManager().getSharedPreferences();

       String value = preferences.getString(SETTINGS_NUMBER_OF_PACKETS, String.valueOf(SETTINGS_NUMBER_OF_PACKETS_DEFAULT));
       // Security check
       if (TextUtils.isEmpty(value)) {
           value = String.valueOf(SETTINGS_NUMBER_OF_PACKETS_DEFAULT);
           preferences.edit().putString(SETTINGS_NUMBER_OF_PACKETS, value).apply();
       }
       screen.findPreference(SETTINGS_NUMBER_OF_PACKETS).setSummary(value);

    final int valueInt = Integer.parseInt(value);
    if (valueInt > 200) {
        new AlertDialog.Builder(getActivity()).setMessage(R.string.dfu_settings_dfu_number_of_packets_info).setTitle(R.string.dfu_settings_dfu_information)
                .setPositiveButton(R.string.ok, null)
                .show();
    }
}