android {
    ...
    dataBinding {
        enabled = true
    }
}
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.4'
implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.6.1'
implementation 'androidx.work:work-runtime-ktx:2.8.1'

// 1. 創(chuàng)建 Worker 類
class SyncWorker(context: Context, params: WorkerParameters) : 
    CoroutineWorker(context, params) {
    override suspend fun doWork(): Result {
        // 執(zhí)行耗時(shí)操作
        networkRequest()
        return Result.success()
    }
}
// 2. 調(diào)度任務(wù)
val constraints = Constraints.Builder()
    .setRequiredNetworkType(NetworkType.UNMETERED)
    .build()
val request = PeriodicWorkRequestBuilder<SyncWorker>(12, TimeUnit.HOURS)
    .setConstraints(constraints)
    .build()
WorkManager.getInstance(this).enqueue(request)

<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable
            name="user"
            type="com.example.app.User" />
    </data>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@{user.name}" />
</layout>

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.databinding.DataBindingUtil
import com.example.app.databinding.ActivityMainBinding
import com.example.app.User
class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        // 獲取綁定類的實(shí)例
        val binding: ActivityMainBinding = DataBindingUtil.setContentView(this, R.layout.activity_main)
        // 創(chuàng)建數(shù)據(jù)模型
        val user = User("John Doe")
        // 將數(shù)據(jù)模型設(shè)置給綁定類
        binding.user = user
    }
}

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import kotlinx.coroutines.*
class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        // 創(chuàng)建協(xié)程作用域
        val scope = CoroutineScope(Dispatchers.Main)
        // 啟動(dòng)協(xié)程
        scope.launch {
            // 在后臺(tái)線程執(zhí)行異步任務(wù)
            val result = withContext(Dispatchers.IO) {
                // 模擬耗時(shí)操作
                delay(2000)
                "Task completed"
            }
            // 在主線程更新 UI
            println(result)
        }
    }
    override fun onDestroy() {
        super.onDestroy()
        // 取消協(xié)程作用域
        scope.cancel()
    }
}

import androidx.lifecycle.Lifecycle
import androidx.lifecycle.LifecycleObserver
import androidx.lifecycle.OnLifecycleEvent
class MyLifecycleObserver : LifecycleObserver {
    @OnLifecycleEvent(Lifecycle.Event.ON_START)
    fun onStart() {
        // 在組件啟動(dòng)時(shí)執(zhí)行的操作
    }
    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
    fun onStop() {
        // 在組件停止時(shí)執(zhí)行的操作
    }
}

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        // 創(chuàng)建 LifecycleObserver 實(shí)例
        val observer = MyLifecycleObserver()
        // 注冊(cè) LifecycleObserver
        lifecycle.addObserver(observer)
    }
}