分为三步：
- 在你的gradle文件中添加如下依赖：
implementation "android.arch.lifecycle:extensions:$project.archLifecycleVersion"
kapt "android.arch.lifecycle:compiler:$project.archLifecycleVersion"
- 创建一个继承自LifecycleObserver监听器
class ForegroundBackgroundListener : LifecycleObserver {
@OnLifecycleEvent(Lifecycle.Event.ON_START)
fun startSomething() {
Log.v("ProcessLog", "APP IS ON FOREGROUND")
}
@OnLifecycleEvent(Lifecycle.Event.ON_STOP)
fun stopSomething() {
Log.v("ProcessLog", "APP IS IN BACKGROUND")
}
}
- 最后，在BaseActivity的onCreate方法中获取ProcessLifecycleOwner并且添加监听
override fun onCreate() {
super.onCreate()
ProcessLifecycleOwner.get()
.lifecycle
.addObserver(
ForegroundBackgroundListener()
.also { appObserver = it })
}
