在Application 中看到 registerActivityLifecycleCallbacks(mCallbacks);
出于好奇就去网上找了相关资料,做好笔记:
Application通过ActivityLifecycleCallbacks使用接口提供了一套回调方法，用于让开发者对 Activity的生命周期事件进行集中处理。
ActivityLifecycleCallbacks接口回调可以简化监测Activity的生命周期事件，在一个类中作统一处理。
使用要求API 14+ （Android 4.0+）//现在基本上已经没有低于14的开发了吧 - . -!!
如需满足较复杂的统计或调试需求时,此法可能会大大减少插入代码量,提高效率.
使用方法:
@Override
public void onCreate() {
super.onCreate();
sInstance = this;
registerActivityLifecycleCallbacks(mCallbacks);
}private ActivityLifecycleCallbacks mCallbacks = new ActivityLifecycleCallbacks() {
@Override
public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
Log.d(TAG, "onActivityCreated() called with: activity = [" + activity + "], savedInstanceState = [" + savedInstanceState + "]");
}
@Override
public void onActivityStarted(Activity activity) {
Log.d(TAG, "onActivityStarted() called with: activity = [" + activity + "]");
}
@Override
public void onActivityResumed(Activity activity) {
Log.d(TAG, "onActivityResumed() called with: activity = [" + activity + "]");
}
@Override
public void onActivityPaused(Activity activity) {
Log.d(TAG, "onActivityPaused() called with: activity = [" + activity + "]");
}
@Override
public void onActivityStopped(Activity activity) {
Log.d(TAG, "onActivityStopped() called with: activity = [" + activity + "]");
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
Log.d(TAG, "onActivitySaveInstanceState() called with: activity = [" + activity + "], outState = [" + outState + "]");
}
@Override
public void onActivityDestroyed(Activity activity) {
Log.d(TAG, "onActivityDestroyed() called with: activity = [" + activity + "]");
}
};在AndroidManifest里启用自定义Application.
public class BaseApplication extends Application {
private static final String TAG = "BaseApplication";
private static BaseApplication sInstance;
public static Context getInstance() {
return sInstance;
}<application android:name=".base.BaseApplication" ....>
...
Application方法介绍
OnLowMemory是Android提供的API，在系统内存不足，所有后台程序（优先级为background的进程，不是指后台运行的进程）都被杀死时，系统会调用OnLowMemory。系统提供的回调有：
Application.onLowMemory()
Activity.OnLowMemory()
Fragement.OnLowMemory()
Service.OnLowMemory()
ContentProvider.OnLowMemory()
随时随地看视频
