ActivityLifecycleCallbacks是一个接口,其包结构为:android.app.Application.ActivityLifecycleCallbacks。Application通过此接口提供了一套方法,用于对Activity的生命周期事件进行集中处理。
以往若需监测Activity的生命周期事件代码,你可能是这样做的,重写每一个Acivity的onResume(),然后作统计和处理:
@Override
protected void onResume() {
super.onResume();
//TODO 处理和统计代码
Log.v(TAG, "onResume");
Logger.v(TAG, "onResume");
Logging.v(TAG, "onResume");
...
}
ActivityLifecycleCallbacks接口回调可以简化这一繁琐过程,在一个类中作统一处理。android.app.Application.ActivityLifecycleCallbacks,要求API 14+ (Android 4.0+)。
在AndroidManifest里起用自定义Application
<application android:name=".global.BaseApplication"
public class BaseApplication extends Application
// 重写Application的onCreate()方法,或在Application的无参构造方法内,调用Application.registerActivityLifecycleCallbacks()方法,并实现ActivityLifecycleCallbacks接口
public void onCreate() {
super.onCreate();
this.registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {
@Override
public void onActivityStopped(Activity activity) {
Logger.v(activity, "onActivityStopped");
}
@Override
public void onActivityStarted(Activity activity) {
Logger.v(activity, "onActivityStarted");
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
Logger.v(activity, "onActivitySaveInstanceState");
}
@Override
public void onActivityResumed(Activity activity) {
Logger.v(activity, "onActivityResumed");
}
@Override
public void onActivityPaused(Activity activity) {
Logger.v(activity, "onActivityPaused");
}
@Override
public void onActivityDestroyed(Activity activity) {
Logger.v(activity, "onActivityDestroyed");
}
@Override
public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
Logger.v(activity, "onActivityCreated");
}
});
};