Android 中 ActivityLifecycleCallbacks的实例详解

概述Android中ActivityLifecycleCallbacks的实例详解         以上就是使用ActivityLifecycleCallbacks的实例，代码注释写的很清楚大家可以参考下，

AndroID 中 ActivitylifecycleCallbacks的实例详解

          以上就是使用ActivitylifecycleCallbacks的实例，代码注释写的很清楚大家可以参考下，

MyApplication如下:

package com.cc;  import java.util.linkedList;  import androID.app.Activity; import androID.app.Application; import androID.os.Bundle; /**  * Demo示例:  * ActivitylifecycleCallbacks使用示例  *  * ActivitylifecycleCallbacks用于对应用中Activity的生命周期的追踪和回调  *  * 使用ActivitylifecycleCallbacks可实现:  * 1 判断App是否在后台运行  * 2 关闭该应用所有Activity  *  *  * (1)判断App是否在后台运行  * 在该实现中采用activityCounter记录Activity的个数.  * 通过对于activityCounter是否为0判断当前APP是否在前台运行.  *  * 从ActivitylifecycleCallbacks的实现方法中我们的惯性思维是:  * 在ActivitylifecycleCallbacks的onActivityResumed()中activityCounter+1.  * 在onActivityPaused()中activityCounter-1,* 但是这么对么？  *  * 先看一下界面跳转时两个Activity的生命周期  * 当从Activity A跳转到Activity B时,两个Activity的生命周期如下:  * A.onPause()->B.onCreate()->B.onStart()-> B.onResume()-> A.onStop()  *  * 假若按照上述方式那么:  * 在A启动后activityCounter=1;  * 当从A跳转到B时在调用A.onPause()时执行:activityCounter-1=0;  * 即该APP运行在后台.  * 这当然是错的,两个界面切换的过程中APP当然是运行在前台的。  *  * 如下修改:  * 在onActivityStarted()中对于activityCounter+1  * 在onActivityStopped()中对于activityCounter-1  * 小结:注意Activity跳转时的生命周期  *  * (2)关闭该应用所有Activity  *  2.1 利用linkedList<Activity>管理应用中的界面  *  2.2 在ActivitylifecycleCallbacks的onActivityCreated()  *    将Activity添加到linkedList中  *    在ActivitylifecycleCallbacks的onActivityDestroyed()  *    将Activity从linkedList中移除  *  2.3 关闭应用时销毁linkedList中所有Activity  *  * 备注说明:  * 1 ActivitylifecycleCallbacks是在API 14及其以上才有的  * 2 在AndroID4.0以下可以在BaseActivity中按照该思路实现  *  */ public class MyApplication extends Application {   private static int activityCounter=0;   private static MyApplication mApplicationInstance;   private static linkedList<Activity> mActivitylinkedList;   private ActivitylifecycleCallbacksImpl mActivitylifecycleCallbacksImpl;   @OverrIDe   public voID onCreate() {     super.onCreate();     mApplicationInstance=new MyApplication();     mActivitylinkedList=new linkedList<Activity>();     mActivitylifecycleCallbacksImpl=new ActivitylifecycleCallbacksImpl();     this.registeractivitylifecycleCallbacks(mActivitylifecycleCallbacksImpl);   }      public static MyApplication getInstance() {     if (null==mApplicationInstance) {       mApplicationInstance=new MyApplication();     }     return mApplicationInstance;   }      //判断App是否在后台运行   public boolean isAppRunningBackground(){     boolean flag=false;     if(activityCounter==0){       flag=true;     }     return flag;   }      //退出应用   public voID finishAllActivity(){     //unregisteractivitylifecycleCallbacks(mActivitylifecycleCallbacksImpl);     System.out.println("--> mActivitylinkedList.size()="+mActivitylinkedList.size());     if(null!=mActivitylinkedList){       for(Activity activity:mActivitylinkedList){         if(null!=activity){           activity.finish();         }       }     }   }         private class ActivitylifecycleCallbacksImpl implements ActivitylifecycleCallbacks{     @OverrIDe     public voID onActivityCreated(Activity activity,Bundle savedInstanceState) {       System.out.println("onActivityCreated --> "+activity.getClass().getname());       if (null!=mActivitylinkedList&&null!=activity) {         mActivitylinkedList.addFirst(activity);       }     }      @OverrIDe     public voID onActivityStarted(Activity activity) {       activityCounter++;       System.out.println("onActivityStarted --> "+activity.getClass().getname()+",activityCounter="+activityCounter);     }      @OverrIDe     public voID onActivityResumed(Activity activity) {       System.out.println("onActivityResumed --> "+activity.getClass().getname());     }      @OverrIDe     public voID onActivityPaused(Activity activity) {       System.out.println("onActivityPaused --> "+activity.getClass().getname());     }      @OverrIDe     public voID onActivityStopped(Activity activity) {       activityCounter--;       System.out.println("onActivityStopped --> "+activity.getClass().getname()+",activityCounter="+activityCounter);     }      @OverrIDe     public voID onActivitySaveInstanceState(Activity activity,Bundle outState) {       System.out.println("onActivitySaveInstanceState --> "+activity.getClass().getname());     }      @OverrIDe     public voID onActivityDestroyed(Activity activity) {       System.out.println("onActivityDestroyed --> "+activity.getClass().getname());       if (null!=mActivitylinkedList&&null!=activity) {         if (mActivitylinkedList.contains(activity)) {           mActivitylinkedList.remove(activity);         }       }     }        }  } 

FirstActivity如下:

package com.cc;  import androID.app.Activity; import androID.content.Context; import androID.content.Intent; import androID.os.Bundle; import androID.vIEw.VIEw; import androID.vIEw.VIEw.OnClickListener; import androID.Widget.button; public class FirstActivity extends Activity {    private Context mContext;    private button mOpenNewActivitybutton;    private button mFinishThisActivitybutton;    private ClickListenerImpl mClickListenerImpl;   @OverrIDe   protected voID onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentVIEw(R.layout.first_activity);     init();   }      private voID init(){     mContext=this;     mClickListenerImpl=new ClickListenerImpl();     mOpenNewActivitybutton=(button) findVIEwByID(R.ID.openNewActivitybutton);     mOpenNewActivitybutton.setonClickListener(mClickListenerImpl);     mFinishThisActivitybutton=(button) findVIEwByID(R.ID.finishThisActivitybutton);     mFinishThisActivitybutton.setonClickListener(mClickListenerImpl);   }         private class ClickListenerImpl implements OnClickListener {     @OverrIDe     public voID onClick(VIEw v) {       switch (v.getID()) {       case R.ID.openNewActivitybutton:         Intent intent=new Intent(mContext,SecondActivity.class);         startActivity(intent);         break;       case R.ID.finishThisActivitybutton:         finish();         break;        default:         break;       }      }    }      @OverrIDe   protected voID onResume() {     super.onResume();     //System.out.println(" first Activity onResume --> "+MyApplication.getInstance().isAppRunningBackground());   }      @OverrIDe   protected voID onStop() {     super.onStop();     //System.out.println(" first Activity onStop --> "+MyApplication.getInstance().isAppRunningBackground());   }       } 

SecondActivity如下:

package com.cc;  import androID.app.Activity; import androID.content.Context; import androID.content.Intent; import androID.os.Bundle; import androID.vIEw.VIEw; import androID.vIEw.VIEw.OnClickListener; import androID.Widget.button;  public class SecondActivity extends Activity {    private Context mContext;    private button mOpenNewActivitybutton;    private button mFinishThisActivitybutton;    private ClickListenerImpl mClickListenerImpl;   @OverrIDe   protected voID onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentVIEw(R.layout.second_activity);     init();   }      private voID init(){     mContext=this;     mClickListenerImpl=new ClickListenerImpl();     mOpenNewActivitybutton=(button) findVIEwByID(R.ID.openNewActivitybutton);     mOpenNewActivitybutton.setonClickListener(mClickListenerImpl);     mFinishThisActivitybutton=(button) findVIEwByID(R.ID.finishThisActivitybutton);     mFinishThisActivitybutton.setonClickListener(mClickListenerImpl);   }         private class ClickListenerImpl implements OnClickListener {     @OverrIDe     public voID onClick(VIEw v) {       switch (v.getID()) {       case R.ID.openNewActivitybutton:         Intent intent=new Intent(mContext,ThirdActivity.class);         startActivity(intent);         break;        case R.ID.finishThisActivitybutton:         finish();         break;        default:         break;       }      }    }     } 

ThirdActivity如下:

package com.cc;  import androID.app.Activity; import androID.content.Context; import androID.content.Intent; import androID.os.Bundle; import androID.vIEw.VIEw; import androID.vIEw.VIEw.OnClickListener; import androID.Widget.button;  public class ThirdActivity extends Activity {    private Context mContext;    private button mFinishAllActivitybutton;    private button mFinishThisActivitybutton;    private ClickListenerImpl mClickListenerImpl;   @OverrIDe   protected voID onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentVIEw(R.layout.third_activity);     init();   }      private voID init(){     mContext=this;     mClickListenerImpl=new ClickListenerImpl();     mFinishThisActivitybutton=(button) findVIEwByID(R.ID.finishThisActivitybutton);     mFinishThisActivitybutton.setonClickListener(mClickListenerImpl);     mFinishAllActivitybutton=(button) findVIEwByID(R.ID.finishAllActivitybutton);     mFinishAllActivitybutton.setonClickListener(mClickListenerImpl);   }         private class ClickListenerImpl implements OnClickListener {     @OverrIDe     public voID onClick(VIEw v) {       switch (v.getID()) {       case R.ID.finishThisActivitybutton:         finish();         break;       case R.ID.finishAllActivitybutton:         MyApplication.getInstance().finishAllActivity();         break;       default:         break;       }      }   }      @OverrIDe   protected voID onResume() {     super.onResume();     //System.out.println(" third Activity onResume --> "+MyApplication.getInstance().isAppRunningBackground());   }      @OverrIDe   protected voID onStop() {     super.onStop();     //System.out.println(" third Activity onStop --> "+MyApplication.getInstance().isAppRunningBackground());   }      @OverrIDe   protected voID onDestroy() {     super.onDestroy();     //System.out.println(" third Activity onDestroy --> "+MyApplication.getInstance().isAppRunningBackground());   }     } 

first_activity.xml如下:

<relativeLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"   xmlns:tools="http://schemas.androID.com/tools"   androID:layout_wIDth="match_parent"   androID:layout_height="match_parent"   androID:paddingBottom="@dimen/activity_vertical_margin"   androID:paddingleft="@dimen/activity_horizontal_margin"   androID:paddingRight="@dimen/activity_horizontal_margin"   androID:paddingtop="@dimen/activity_vertical_margin"   tools:context="com.cc.FirstActivity" >    <button     androID:ID="@+ID/openNewActivitybutton"     androID:layout_wIDth="wrap_content"     androID:layout_height="wrap_content"     androID:layout_centerInParent="true"     androID:text="open new Activity" />    <TextVIEw     androID:layout_wIDth="wrap_content"     androID:layout_height="wrap_content"     androID:layout_above="@ID/openNewActivitybutton"     androID:layout_centerInParent="true"     androID:layout_marginBottom="50dip"     androID:textSize="20sp"     androID:textcolor="@androID:color/holo_red_light"     androID:text="This is the first Activity" />    <button     androID:ID="@+ID/finishThisActivitybutton"     androID:layout_wIDth="wrap_content"     androID:layout_height="wrap_content"     androID:layout_below="@ID/openNewActivitybutton"     androID:layout_centerHorizontal="true"     androID:layout_margintop="50dip"     androID:text="finish this activity" />  </relativeLayout> 

second_activity.xml如下:

<relativeLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"   xmlns:tools="http://schemas.androID.com/tools"   androID:layout_wIDth="match_parent"   androID:layout_height="match_parent"   androID:paddingBottom="@dimen/activity_vertical_margin"   androID:paddingleft="@dimen/activity_horizontal_margin"   androID:paddingRight="@dimen/activity_horizontal_margin"   androID:paddingtop="@dimen/activity_vertical_margin"   tools:context="com.cc.FirstActivity" >    <button     androID:ID="@+ID/openNewActivitybutton"     androID:layout_wIDth="wrap_content"     androID:layout_height="wrap_content"     androID:layout_centerInParent="true"     androID:text="open new Activity" />    <TextVIEw     androID:layout_wIDth="wrap_content"     androID:layout_height="wrap_content"     androID:layout_above="@ID/openNewActivitybutton"     androID:layout_centerInParent="true"     androID:layout_marginBottom="50dip"     androID:textSize="20sp"     androID:textcolor="@androID:color/holo_red_light"     androID:text="This is the second Activity" />    <button     androID:ID="@+ID/finishThisActivitybutton"     androID:layout_wIDth="wrap_content"     androID:layout_height="wrap_content"     androID:layout_below="@ID/openNewActivitybutton"     androID:layout_centerHorizontal="true"     androID:layout_margintop="50dip"     androID:text="finish this activity" />  </relativeLayout> 

third_activity.xml如下:

<relativeLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"   xmlns:tools="http://schemas.androID.com/tools"   androID:layout_wIDth="match_parent"   androID:layout_height="match_parent"   androID:paddingBottom="@dimen/activity_vertical_margin"   androID:paddingleft="@dimen/activity_horizontal_margin"   androID:paddingRight="@dimen/activity_horizontal_margin"   androID:paddingtop="@dimen/activity_vertical_margin"   tools:context="com.cc.FirstActivity" >    <TextVIEw     androID:ID="@+ID/textVIEw"     androID:layout_wIDth="wrap_content"     androID:layout_height="wrap_content"     androID:layout_above="@ID/openNewActivitybutton"     androID:layout_centerHorizontal="true"     androID:layout_margintop="100dp"     androID:text="This is the third Activity"     androID:textcolor="@androID:color/holo_red_light"     androID:textSize="20sp" />    <button     androID:ID="@+ID/finishThisActivitybutton"     androID:layout_wIDth="wrap_content"     androID:layout_height="wrap_content"     androID:layout_below="@ID/textVIEw"     androID:layout_centerHorizontal="true"     androID:layout_margintop="50dip"     androID:text="finish this activity" />    <button     androID:ID="@+ID/finishAllActivitybutton"     androID:layout_wIDth="wrap_content"     androID:layout_height="wrap_content"     androID:layout_below="@ID/finishThisActivitybutton"     androID:layout_centerHorizontal="true"     androID:layout_margintop="50dip"     androID:text="finish All Activity" />  </relativeLayout> 

AndroIDManifest.xml如下:

<?xml version="1.0" enCoding="utf-8"?> <manifest xmlns:androID="http://schemas.androID.com/apk/res/androID"   package="com.cc"   androID:versionCode="1"   androID:versionname="1.0" >    <uses-sdk     androID:minSdkVersion="14"     androID:targetSdkVersion="14" />    <application     androID:name="com.cc.MyApplication"     androID:allowBackup="true"     androID:icon="@drawable/ic_launcher"     androID:label="@string/app_name"     androID:theme="@style/Apptheme" >     <activity       androID:name=".FirstActivity"       androID:label="@string/app_name" >       <intent-filter>         <action androID:name="androID.intent.action.MAIN" />          <category androID:name="androID.intent.category.LAUNCHER" />       </intent-filter>     </activity>          <activity androID:name="com.cc.SecondActivity"/>     <activity androID:name="com.cc.ThirdActivity"/>   </application>  </manifest> 

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