如何设置LiveData执行基于多个参数的搜索？

data class SearchParams(val keyword: String, val category: String)

class SearchViewModel : ViewModel() {
    private val _searchResults = MutableLiveData<List<Result>>()
    val searchResults: LiveData<List<Result>> get() = _searchResults

    fun search(params: SearchParams) {
        // 执行搜索操作，获取搜索结果
        val results = performSearch(params.keyword, params.category)
        _searchResults.value = results
    }

    private fun performSearch(keyword: String, category: String): List<Result> {
        // 执行实际的搜索逻辑，并返回结果
        // ...
    }
}

class SearchActivity : AppCompatActivity() {
    private lateinit var searchViewModel: SearchViewModel

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_search)

        searchViewModel = ViewModelProvider(this).get(SearchViewModel::class.java)

        // 观察LiveData对象，并在数据发生变化时更新UI
        searchViewModel.searchResults.observe(this, Observer { results ->
            // 更新UI，显示搜索结果
            // ...
        })

        // 执行搜索操作
        val params = SearchParams("keyword", "category")
        searchViewModel.search(params)
    }
}