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); }}

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1楼shenzhen_许杰

以后项目用这个试试