// 定義 ViewModel 類
import androidx.lifecycle.ViewModel
import androidx.lifecycle.MutableLiveData
class NewsViewModel : ViewModel() {
    // 定義 LiveData 存儲新聞列表
    private val _newsList = MutableLiveData<List<String>>()
    val newsList: LiveData<List<String>> = _newsList
    init {
        // 模擬從網(wǎng)絡(luò)或數(shù)據(jù)庫獲取新聞數(shù)據(jù)
        fetchNews()
    }
    private fun fetchNews() {
        // 這里可以替換為真實(shí)的網(wǎng)絡(luò)請求或數(shù)據(jù)庫查詢
        val mockNews = listOf("新聞1", "新聞2", "新聞3")
        _newsList.value = mockNews
    }
}
// 在 Activity 中使用 ViewModel
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.lifecycle.ViewModelProvider
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
    private lateinit var newsViewModel: NewsViewModel
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView{"name":"GodelPlugin","parameters":{"input":"\"setContentView(R.layout.activity_main)\""}}<|FunctionExecuteEnd|><|FunctionExecuteResult|>setContentView(R.layout.activity_main)<|FunctionExecuteResultEnd|>
        // 獲取 ViewModel 實(shí)例
        newsViewModel = ViewModelProvider(this).get(NewsViewModel::class.java)
        // 觀察 LiveData 數(shù)據(jù)變化
        newsViewModel.newsList.observe(this, { news ->
            // 更新 UI
            news.forEach {
                textView.append("$it\n")
            }
        })
    }
}

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.Observer
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
    private val liveData = MutableLiveData<String>()
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView{"name":"GodelPlugin","parameters":{"input":"\"setContentView(R.layout.activity_main)\""}}<|FunctionExecuteEnd|><|FunctionExecuteResult|>setContentView(R.layout.activity_main)<|FunctionExecuteResultEnd|>
        // 注冊觀察者
        liveData.observe(this, Observer { data ->
            // 處理數(shù)據(jù)變化
            textView.text = data
        })
        // 更新數(shù)據(jù)
        liveData.value = "新數(shù)據(jù)"
    }
}

// 定義實(shí)體類
import androidx.room.Entity
import androidx.room.PrimaryKey
@Entity(tableName = "news")
data class News(
    @PrimaryKey(autoGenerate = true)
    val id: Int = 0,
    val title: String
)
// 定義 DAO
import androidx.room.Dao
import androidx.room.Insert
import androidx.room.Query
@Dao
interface NewsDao {
    @Insert
    suspend fun insertNews(news: News)
    @Query("SELECT * FROM news")
    suspend fun getAllNews(): List<News>
}
// 定義數(shù)據(jù)庫類
import androidx.room.Database
import androidx.room.RoomDatabase
@Database(entities = [News::class], version = 1)
abstract class AppDatabase : RoomDatabase() {
    abstract fun newsDao(): NewsDao
}
// 在 ViewModel 中使用 Room
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import kotlinx.coroutines.launch
class NewsViewModel : ViewModel() {
    private val database = Room.databaseBuilder(
        applicationContext,
        AppDatabase::class.java,
        "news-database"
    ).build()
    private val newsDao = database.newsDao()
    fun insertNews(news: News) {
        viewModelScope.launch {
            newsDao.insertNews(news)
        }
    }
    fun getAllNews() {
        viewModelScope.launch {
            val newsList = newsDao.getAllNews()
            // 處理獲取到的新聞列表
        }
    }
}

<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/navigation_graph"
    app:startDestination="@id/firstFragment">
    <fragment
        android:id="@+id/firstFragment"
        android:name="com.example.myapp.FirstFragment"
        android:label="First Fragment">
        <action
            android:id="@+id/action_firstFragment_to_secondFragment"
            app:destination="@id/secondFragment" />
    </fragment>
    <fragment
        android:id="@+id/secondFragment"
        android:name="com.example.myapp.SecondFragment"
        android:label="Second Fragment" />
</navigation>

<androidx.fragment.app.FragmentContainerView
    android:id="@+id/nav_host_fragment"
    android:name="androidx.navigation.fragment.NavHostFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:defaultNavHost="true"
    app:navGraph="@navigation/navigation_graph" />

import androidx.fragment.app.Fragment
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.navigation.fragment.findNavController
class FirstFragment : Fragment() {
    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        val view = inflater.inflate(R.layout.fragment_first, container, false)
        view.findViewById<Button>(R.id.navigateButton).setOnClickListener {
            // 導(dǎo)航到 SecondFragment
            findNavController().navigate(R.id.action_firstFragment_to_secondFragment)
        }
        return view
    }
}