移除建议设置（推荐设置）

通过阅读源码packages/apps/Settings/src/com/android/settings/dashboard/DashboardSummary.java#SuggestionLoader

    private class SuggestionLoader extends AsyncTask<Void, Void, List<Tile>> {

        @Override
        protected List<Tile> doInBackground(Void... params) {
....
                if (mSuggestionsChecks.isSuggestionComplete(suggestion)) {
                    mAdapter.disableSuggestion(suggestion);
                    suggestions.remove(i--);
                }
....
        }
}

可以得出若isSuggestionComplete返回true时则该项不会出现在推荐设置中，因此在packages/apps/Settings/src/com/android/settings/dashboard/SuggestionsChecks.java#isSuggestionComplete直接返回true

    public boolean isSuggestionComplete(Tile suggestion) {
        return true;
    }

移除蓝牙设置项

Settings使用以下代码判断设备是否支持蓝牙若不支持蓝牙则将其隐藏
packages/apps/Settings/src/com/android/settings/SettingsActivity.java#doUpdateTilesList

    private void doUpdateTilesList() {
    ....
            setTileEnabled(new ComponentName(packageName,
                Settings.BluetoothSettingsActivity.class.getName()),
                pm.hasSystemFeature(PackageManager.FEATURE_BLUETOOTH), isAdmin, pm);
...
                }

因此通过分析hasSystemFeature可以得出将/system/etc/permissions/android.hardware.bluetooth.xml中<feature name="android.hardware.bluetooth" />注释即可屏蔽，其对应在系统中的目录为:
frameworks/native/data/etc/android.hardware.bluetooth.xml

<permissions>
    <!-- <feature name="android.hardware.bluetooth" />-->
</permissions>