android实现退出时关闭所有activity

来自郭霖《第一行代码》

1、新建ActivityCollector类，代码如下：

public static List activities = new ArrayList();
public static void addActivity(Activity activity) {
    activities.add(activity);
}
public static void removeActivity(Activity activity) {
    activities.remove(activity);
}
public static void finishAll() {
    for (Activity activity : activities) {
        if (!activity.isFinishing()) {
            activity.finish();
        }
    }
}

2、在每个activity中

重写onCreate方法，在super.onCreate(savedInstanceState);后调用ActivityCollector.addActivity(this);

重写onDestroy方法，在super.onDestroy();后调用ActivityCollector.removeActivity(this);

3、在退出程序的地方，调用：ActivityCollector.finishAll();