实战项目中管理Activity的类，一般在BaseActivity会调用这个类，然后所有的Activity继承BaseActivity，这样管理好整个项目的Activity。

截图取自百度图片

/**
 *  activity堆栈管理
 */
public class ActivityStackManager {
private static ActivityStackManager mInstance;
private static Stack<Activity> mActivityStack;

public static ActivityStackManager getInstance() {

    if (null == mInstance) {
        mInstance = new ActivityStackManager();
    }

    return mInstance;
}

private ActivityStackManager() {
    mActivityStack = new Stack<Activity>();
}

/**
 * 入栈
 *
 * @param activity
 */
public void addActivity(Activity activity) {
    mActivityStack.push(activity);
}

/**
 * 出栈
 *
 * @param activity
 */
public void removeActivity(Activity activity) {
    mActivityStack.remove(activity);
}

/**
 * 彻底退出
 */
public void finishAllActivity() {
    Activity activity;
    while (!mActivityStack.empty()) {
        activity = mActivityStack.pop();
        if (activity != null) {
            activity.finish();
        }
    }
}

/**
 * 结束指定类名的Activity
 *
 * @param cls
 */
public void finishActivity(Class<?> cls) {
    for (Activity activity : mActivityStack) {
        if (activity.getClass().equals(cls)) {
            finishActivity(activity);
        }
    }
}

/**
 * 查找栈中是否存在指定的activity
 *
 * @param cls
 * @return
 */
public boolean checkActivity(Class<?> cls) {
    for (Activity activity : mActivityStack) {
        if (activity.getClass().equals(cls)) {
            return true;
        }
    }
    return false;
}

/**
 * 结束指定的Activity
 *
 * @param activity
 */
public void finishActivity(Activity activity) {
    if (activity != null) {
        mActivityStack.remove(activity);
        activity.finish();
        activity = null;
    }
}

/**
 * finish指定的activity之上所有的activity
 *
 * @param actCls
 * @param isIncludeSelf
 * @return
 */
public boolean finishToActivity(Class<? extends Activity> actCls, boolean isIncludeSelf) {
    List<Activity> buf = new ArrayList<Activity>();
    int size = mActivityStack.size();
    Activity activity = null;
    for (int i = size - 1; i >= 0; i--) {
        activity = mActivityStack.get(i);
        if (activity.getClass().isAssignableFrom(actCls)) {
            for (Activity a : buf) {
                a.finish();
            }
            return true;
        } else if (i == size - 1 && isIncludeSelf) {
            buf.add(activity);
        } else if (i != size - 1) {
            buf.add(activity);
        }
    }
    return false;
}}