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

 1 public class ActivityManager{
 2     private static final String TAG = "ActivityManager";
 3     private static Stack<Activity> activityStack;
 4     private static ActivityManager instance;
 5     private Activity currActivity;
 6     private ActivityManager(){
 7     }
 8 
 9     public static ActivityManager getActivityManager(){
10         if(instance == null){
11             instance = new ActivityManager();
12         }
13         return instance;
14     }
15 
16     //退出栈顶Activity
17     public void popActivity(Activity activity){
18         if(activity == null || activityStack == null){
19             return;
20         }
21         if(activityStack.contains(activity)){
22             activityStack.remove(activity);
23         }
24         currActivity = activity;
25         //activity.finish;
26 
27     }
28 
29     public void destoryActivity(Activity activity){
30         if(activity == null){
31             return;
32         }
33         activity.finish();
34         if(activityStack.contains(activity)){
35             activityStack.remove(activity);
36         }
37         activity=null;
38     }
39 
40     //获得当前栈顶Activity
41     public Activity currentActivity(){
42         if(activityStack == null||activityStack.empty()){
43             return null;
44         }
45         return activityStack.lastElement();
46     }
47 
48     //将当前Activity推入栈中
49     public void pushActivity(Activity activity){
50         if(activityStack == null){
51             activityStack = new Stack<Activity>();
52         }
53         activityStack.add(activity);
54     }
55 
56     //退出栈中除指定的Activity外所有
57     public void popAllActivityExceptOne(Class cls){
58         while(true){
59             Activity activity = currentActivity();
60             if(activity == null){
61                 break;
62             if(activity.getClass().equals(cls))
63                 break;
64             destroyActivity(activity);
65         }
66     }
67 
68     //退出栈中所有Activity
69     public void popAllActivity(){
70         popAllActivityExceptOne(null);
71     }
72 
73     public Activity getCurrentActivity(){
74         return currActivity;
75     }
76 
77     public int getActivityStackSize(){
78         int size = 0;
79         if(activityStack != null){
80             size = activityStack.size();
81         }
82         return size;
83     }
84 }

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）

 1 @Override
 2 protected void onPause(){
 3     super.onPause();
 4     ActivityManager.getActivityManager().pushActivity(this);
 5 }
 6 
 7 @Override
 8 protected void onResume(){
 9     super.onResume();
10     ActivityManager.getActivityManager().popActivity(this);
11 }

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

1 if(isRestart){
2     ActivityManager.getActivityManager().popAllActivity();
3     Intent intent = new Intent(this, LoadingActivity.class);
4     intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
5     startActivity(intent);
6     isRestart=false;
7     this.finish();
8 }