DevelopmentSettingsActivity.java 文件源码

private void updateShowTouchesOptions() {
    final SwitchPreference showTouchesPref = (SwitchPreference) findPreference("show_touches");
    int enable = 0;
    try {
        enable = Settings.System.getInt(getContentResolver(), Constants.SETTINGS_SYSTEM_SHOW_TOUCHES);
    } catch (Settings.SettingNotFoundException e) {
        e.printStackTrace();
    }
    showTouchesPref.setChecked(enable == 1);

    showTouchesPref.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
        @Override
        public boolean onPreferenceChange(Preference preference, Object newValue) {
            Settings.System.putInt(getContentResolver(),
                    Constants.SETTINGS_SYSTEM_SHOW_TOUCHES,
                    newValue == Boolean.TRUE ? 1 : 0);
            return true;
        }
    });
}