Activity Management classes: for managing activity and exiting Programs

importjava.util.Stack; 

   import android.app.Activity;  import android.app.ActivityManager;  import android.content.Context;     /**   *    * @ClassName: com.qust.myutils.AppManager   * @Description: Activity管理类：用于管理Activity和退出程序   *    */ public class AppManager {          // Activity栈       private static Stack<Activity> activityStack;       // 单例模式       private static AppManager instance;          private AppManager() {       }          /**       * 单一实例       */      public static AppManager getAppManager() {           if (instance == null ) {               instance = new AppManager();           }           return instance;       }          /**       * 添加Activity到堆栈       */      public void addActivity(Activity activity) {           if (activityStack == null ) {               activityStack = new Stack<Activity>();           }           activityStack.add(activity);       }          /**       * 获取当前Activity（堆栈中最后一个压入的）       */      public Activity currentActivity() {           Activity activity = activityStack.lastElement();           return activity;       }          /**       * 结束当前Activity（堆栈中最后一个压入的）       */      public void finishActivity() {           Activity activity = activityStack.lastElement();           finishActivity(activity);       }          /**       * 结束指定的Activity       */      public void finishActivity(Activity activity) {           if (activity != null ) {               activityStack.remove(activity);               activity.finish();               activity = null ;           }       }          /**       * 结束指定类名的Activity       */      public void finishActivity(Class<?> cls) {           for (Activity activity : activityStack) {               if (activity.getClass().equals(cls)) {                   finishActivity(activity);               }           }       }          /**       * 结束所有Activity       */      public void finishAllActivity() {           for ( int i = 0 ; i < activityStack.size(); i++) {               if ( null != activityStack.get(i)) {                   activityStack.get(i).finish();               }           }           activityStack.clear();       }          /**       * 退出应用程序       */      public void AppExit(Context context) {           try {               finishAllActivity();               ActivityManager activityMgr = (ActivityManager) context                       .getSystemService(Context.ACTIVITY_SERVICE);               activityMgr.killBackgroundProcesses(context.getPackageName());               System.exit( 0 );           } catch (Exception e) {           }       }  }

Activity Management classes: for managing activity and exiting Programs