Android -- ActivityLifeCycleCallbacks
ActivityLifeCycleCallbacks Application通过此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。 为什么用ActivityLifecycleCallbacks 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。 ActivityLifecycleCallbacks怎么用？ 在自定义的Application中的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"); } }); }; Log: V/OneActivity: onActivityCreated V/OneActivity: onActivityStarted V/OneActivity: onActivityResumed V/OneActivity: onActivityPaused V/MainActivity: onActivityCreated V/MainActivity: onActivityStarted V/MainActivity: onActivityResumed V/OneActivity: onActivityStopped V/OneActivity: onActivityDestroyed V/MainActivity: onActivityPaused V/MainActivity: onActivityStopped V/MainActivity: onActivityDestroyed 注意 ActivityLifeCycleCallbacks在API>=14上才可以调用。 兼容API<14 自己写一个ActivityLifeCycleCallbacks接口： public interface ActivityLifecycleCallbacks{ public void onActivityStopped(Activity activity); public void onActivityStarted(Activity activity); public void onActivitySaveInstanceState(Activity activity, Bundle outState); public void onActivityResumed(Activity activity); public void onActivityPaused(Activity activity); public void onActivityDestroyed(Activity activity); public void onActivityCreated(Activity activity, Bundle savedInstanceState); } 在Application中实现接口： public class MyApplication extends Application implements my.package.ActivityLifecycleCallbacks{ @Override public void onCreate() { super.onCreate(); } @Override public void onActivityStopped(Activity activity) { Log.i("Tracking Activity Stopped", activity.getLocalClassName()); } @Override public void onActivityStarted(Activity activity) { Log.i("Tracking Activity Started", activity.getLocalClassName()); } @Override public void onActivitySaveInstanceState(Activity activity, Bundle outState) { Log.i("Tracking Activity SaveInstanceState", activity.getLocalClassName()); } @Override public void onActivityResumed(Activity activity) { Log.i("Tracking Activity Resumed", activity.getLocalClassName()); } @Override public void onActivityPaused(Activity activity) { Log.i("Tracking Activity Paused", activity.getLocalClassName()); } @Override public void onActivityDestroyed(Activity activity) { Log.i("Tracking Activity Destroyed", activity.getLocalClassName()); } @Override public void onActivityCreated(Activity activity, Bundle savedInstanceState) { Log.i("Tracking Activity Created", activity.getLocalClassName()); } } 写基类： public class BaseActivity extends Activity { protected MyApplication nMyApplication; protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); nMyApplication = (MyApplication) getApplication(); nMyApplication.onActivityCreated(this, savedInstanceState); } protected void onResume() { // TODO Auto-generated method stub nMyApplication.onActivityResumed(this); super.onResume(); } @Override protected void onPause() { // TODO Auto-generated method stub nMyApplication.onActivityPaused(this); super.onPause(); } @Override protected void onDestroy() { // TODO Auto-generated method stub nMyApplication.onActivityDestroyed(this); super.onDestroy(); } @Override protected void onStart() { nMyApplication.onActivityStarted(this); super.onStart(); } @Override protected void onStop() { nMyApplication.onActivityStopped(this); super.onStop(); } @Override protected void onSaveInstanceState(Bundle outState) { nMyApplication.onActivitySaveInstanceState(this, outState); super.onSaveInstanceState(outState); } } 所有的类集成这个基类： public class MainActivity extends BaseActivity{ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } } 本文转自我爱物联网博客园博客，原文链接：http://www.cnblogs.com/yydcdut/p/4945990.html，如需转载请自行联系原作者
