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service 的实例代码

package com.lyr.myapplication.serviceimport android.content.Intentimport android.os.IBinderimport android.util.Logimport androidx.lifecycle.LifecycleServiceimport androidx.lifecycle.lifecycleScopeimport kotlinx.coroutines.delayimport kotlinx.coroutines.launchclass ExampleService : LifecycleService() {
       var number = 0    override fun onCreate() {
           super.onCreate()        Log.i("xxx", "开启服务")    }    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
           lifecycleScope.launch{
               while (true) {
                   delay(1_000)                Log.d("xx","${++number}")            }        }        return super.onStartCommand(intent, flags, startId)     override fun onBind(intent: Intent): IBinder {
           super.onBind(intent)        TODO("XX ")    }}

onCreate 的时候，启动后台服务

package com.lyr.myapplicationimport android.content.Intentimport android.os.Bundleimport android.os.PersistableBundleimport android.util.Logimport androidx.appcompat.app.AppCompatActivityimport com.lyr.myapplication.service.ExampleServiceimport kotlinx.android.synthetic.main.webview_example.*/** * @Author  lyr * @create 2020/10/12 22:18 */class WebViewExampleActivity : AppCompatActivity() {
       override fun onCreate(savedInstanceState: Bundle?){
           super.onCreate(savedInstanceState)        setContentView(R.layout.webview_example)        Log.i("x","加载页面")        webView.settings.javaScriptEnabled = true//        webView.loadUrl("https://m.baidu.com")        //webView.loadUrl("file:///")        webView.loadUrl("file:///android_asset/example.html");//        Intent(this,ExampleActivity::class.java).also {
   //            startActivity(it)//        }        Intent(this,ExampleService::class.java).also {
               startService(it)        }    }}

需要导入 的 依赖

implementation group: 'androidx.lifecycle', name: 'lifecycle-service', version: '2.2.0'    // https://mvnrepository.com/artifact/androidx.lifecycle/lifecycle-livedata    implementation group: 'androidx.lifecycle', name: 'lifecycle-livedata', version: '2.2.0'    // https://mvnrepository.com/artifact/androidx.lifecycle/lifecycle-livedata-ktx    implementation group: 'androidx.lifecycle', name: 'lifecycle-livedata-ktx', version: '2.2.0'    // https://mvnrepository.com/artifact/androidx.lifecycle/lifecycle-runtime    implementation group: 'androidx.lifecycle', name: 'lifecycle-runtime-ktx', version: '2.2.0'

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