SoundSettings.java 文件源码

private void initVibrateWhenRinging(PreferenceCategory root) {
    mVibrateWhenRinging = (TwoStatePreference) root.findPreference(KEY_VIBRATE_WHEN_RINGING);
    if (mVibrateWhenRinging == null) {
        Log.i(TAG, "Preference not found: " + KEY_VIBRATE_WHEN_RINGING);
        return;
    }
    if (!mVoiceCapable || !Utils.isUserOwner()) {
        root.removePreference(mVibrateWhenRinging);
        mVibrateWhenRinging = null;
        return;
    }
    mVibrateWhenRinging.setPersistent(false);
    updateVibrateWhenRinging();
    mVibrateWhenRinging.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
        @Override
        public boolean onPreferenceChange(Preference preference, Object newValue) {
            final boolean val = (Boolean) newValue;
            return Settings.System.putInt(getContentResolver(),
                    Settings.System.VIBRATE_WHEN_RINGING,
                    val ? 1 : 0);
        }
    });
}