Android ActivityManager工具类

public class ActivityManager {    private volatile static ActivityManager sInstance = null;    private ActivityManager() {    }    public static ActivityManager getInstance() {        if (sInstance == null) {            synchronized (ActivityManager.class) {                if (sInstance == null) {                    sInstance = new ActivityManager();                }            }        }        return sInstance;    }    private Stack stack = new Stack<>();    public void addActivity(Activity activity) {        stack.add(activity);    }    public void removeActivity(Activity activity) {        stack.remove(activity);    }    public void clearActivities() {        for (Activity activity : stack) {            if (!activity.isFinishing()) {                activity.finish();            }        }    }    public void removeAboveActivities(@NotNull Class activityClass) {        try {            for (Activity activity = stack.peek(); !activity.getClass().equals(activityClass); activity = stack.pop()) {                activity.finish();            }        } catch (Exception e) {        }    }}
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