Android(安卓)使用ActivityLifecycleCallbacks监听自己应用Activity的生命周期

有时候我们需要对自己的Activity的生命周期进行监控，比如说手势密码，当满足条件后，需要把手势密码界面覆盖上去，Android 在4.0之后提供了

ActivityLifecycleCallbacks

这个借口提供了应用所有Activity的生命周期回调，用法如下：

public class MyApplication extends Application {    private  int resumed;    private  int paused;    @Override    public void onCreate() {        super.onCreate();        this.registerActivityLifecycleCallbacks(new MyActivityLifecycleCallbacks()) ;    }    class MyActivityLifecycleCallbacks implements ActivityLifecycleCallbacks    {        @Override        public void onActivityCreated(Activity activity, Bundle bundle) {            Log.e("Activity", activity.getClass().getSimpleName()+"onActivityCreated");        }        @Override        public void onActivityStarted(Activity activity) {            Log.e("Activity",activity.getClass().getSimpleName()+"onActivityStarted");        }        @Override        public void onActivityResumed(Activity activity) {            Log.e("Activity",activity.getClass().getSimpleName()+"onActivityResumed");            resumed++ ;        }        @Override        public void onActivityPaused(Activity activity) {            Log.e("Activity",activity.getClass().getSimpleName()+"onActivityPaused");            paused++ ;        }        @Override        public void onActivityStopped(Activity activity) {            Log.e("Activity",activity.getClass().getSimpleName()+"onActivityStopped");        }        @Override        public void onActivitySaveInstanceState(Activity activity, Bundle bundle) {            Log.e("Activity",activity.getClass().getSimpleName()+"onActivitySaveInstanceState");        }        @Override        public void onActivityDestroyed(Activity activity) {            Log.e("Activity",activity.getClass().getSimpleName()+"onActivityDestroyed");        }       /* public boolean isApplicationInForeground() {            // 当所有 Activity 的状态中处于 resumed 的大于 paused 状态的，即可认为有Activity处于前台状态中            return resumed > paused;        }*/    }}

在Application中实现这个接口，我们在启动MainActivity的时候打印日志：

 E/Activity: MainActivityonActivityCreated E/Activity: MainActivityonActivityStarted E/Activity: MainActivityonActivityResumed

然后在MainActivity中启动第二个Activity：

 E/Activity: MainActivityonActivityPaused E/Activity: SecondActivityonActivityCreated E/Activity: SecondActivityonActivityStarted E/Activity: SecondActivityonActivityResumed E/Activity: MainActivityonActivitySaveInstanceState E/Activity: MainActivityonActivityStopped

第二个Activity 的生命周期依次打印，使用起来是非常的简便。

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