得益于 scala trait 的链式操作
假设你有一个UtilService 内容如下
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class UtilService extends Service {
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utilService =>// UtilService.this 别名
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def doSomething(xx: Any) = {
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//your code
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}
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def onBind(p1: Intent) = new UtilServiceBinder
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class UtilServiceBinder extends Binder {
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def getService = utilService
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}
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}
添加一个 base trait MixinUtilServiceBase
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protected trait MixinUtilServiceBase {
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lazy val utilService = {
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assert(utilServiceHolder != null); utilServiceHolder
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}// utilService 将混入(mixin) 到 activity 或 service
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private var utilServiceHolder: UtilService = null
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protected val utilServiceConnection = new ServiceConnection {
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def onServiceConnected(className: ComponentName, binder: IBinder) {
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utilServiceHolder = binder.asInstanceOf[UtilService#UtilServiceBinder].getService
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}
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def onServiceDisconnected(className: ComponentName) {
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// do something
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}
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}
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}
添加一个trait ActivityMixinUtilService
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trait ActivityMixinUtilService extends Activity with MixinUtilServiceBase {
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context =>
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abstract override def onCreate(savedInstanceState: Bundle) {
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super.onCreate(savedInstanceState)
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bindService(new Intent(context, classOf[UtilService]), utilServiceConnection, Context.BIND_AUTO_CREATE)
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}
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abstract override def onDestroy() {
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unbindService(utilServiceConnection)
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super.onDestroy()
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}
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}
现在你可以在你自己的Activity 内使用 ActivityMixinUtilService trait 了， 想下面这样
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class Main extends Activity with ActivityMixinUtilService {
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context =>
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def doSome() {
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utilService.doSomething() // 现在 utilService 混合（mixin) 到了main Activity
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}
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}
extends Activity 可以省略掉
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class Main extends ActivityMixinUtilService
像Activity一样 ServiceMixinUtilService
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trait ServiceMixinUtilService extends Service with MixinUtilServiceBase {
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context =>
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abstract override def onCreate() {
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super.onCreate()
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bindService(new Intent(context, classOf[UtilService]), utilServiceConnection, Context.BIND_AUTO_CREATE)
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}
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abstract override def onDestroy() {
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unbindService(utilServiceConnection)
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super.onDestroy()
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}
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}
确保添加UtilService 到AndroidManifest.xml
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<service android:name=".services.UtilService"/>
