Android—一次清除所有Activity

首先，自定义一个ActivityManager管理类，用于管理栈中的Activity

 public class ActivityManager{
     private static final String TAG = "ActivityManager";
     private static Stack<Activity> activityStack;
     private static ActivityManager instance;
     private Activity currActivity;
     private ActivityManager(){
     }

     public static ActivityManager getActivityManager(){
         if(instance == null){
             instance = new ActivityManager();
         }
         return instance;
     }

     //退出栈顶Activity
     public void popActivity(Activity activity){
         if(activity == null || activityStack == null){
             return;
         }
         if(activityStack.contains(activity)){
             activityStack.remove(activity);
         }
         currActivity = activity;
         //activity.finish;

     }

     public void destoryActivity(Activity activity){
         if(activity == null){
             return;
         }
         activity.finish();
         if(activityStack.contains(activity)){
             activityStack.remove(activity);
         }
         activity=null;
     }

     //获得当前栈顶Activity
     public Activity currentActivity(){
         if(activityStack == null||activityStack.empty()){
             return null;
         }
         return activityStack.lastElement();
     }

     //将当前Activity推入栈中
     public void pushActivity(Activity activity){
         if(activityStack == null){
             activityStack = new Stack<Activity>();
         }
         activityStack.add(activity);
     }

     //退出栈中除指定的Activity外所有
     public void popAllActivityExceptOne(Class cls){
         while(true){
             Activity activity = currentActivity();
             if(activity == null){
                 break;
             if(activity.getClass().equals(cls))
                 break;
             destroyActivity(activity);
         }
     }

     //退出栈中所有Activity
     public void popAllActivity(){
         popAllActivityExceptOne(null);
     }

     public Activity getCurrentActivity(){
         return currActivity;
     }

     public int getActivityStackSize(){
         int size = 0;
         if(activityStack != null){
             size = activityStack.size();
         }
         return size;
     }
 }

然后，在baseActivity中的两个方法添加如下方法（如果没有baseActivity，就得一个个加了）

 @Override
 protected void onPause(){
     super.onPause();
     ActivityManager.getActivityManager().pushActivity(this);
 }

 @Override
 protected void onResume(){
     super.onResume();
     ActivityManager.getActivityManager().popActivity(this);
 }

最后，根据需求判断，在需要清除所有activity的地方，加上如下代码

 if(isRestart){
     ActivityManager.getActivityManager().popAllActivity();
     Intent intent = new Intent(this, LoadingActivity.class);
     intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
     startActivity(intent);
     isRestart=false;
     this.finish();
 }

PS：清除掉所有activity后，startActivity时需要给它加上Intent.FLAG_ACTIVITY_CLEAR_TOP,表示start的这个activity置顶，并二次清除掉所有这个activity之上的activity。

转自：http://blog.csdn.net/a394268045/article/details/51648149