打开一个Activity, 关闭之前所有的Activity.

Intent intent = new Intent(this, LoginActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);

public class CacheActivity {

public static List<Activity> activityList = new LinkedList<Activity>();

public CacheActivity() {

}

/**
* 添加到Activity容器中
*/
public static void addActivity(Activity activity) {
if (!activityList.contains(activity)) {
activityList.add(activity);
}
}

/**
* 便利所有Activigty并finish
*/
public static void finishActivity() {
for (Activity activity : activityList) {
activity.finish();
}
activityList.clear();
}

/**
* 结束指定的Activity
*/
public static void finishSingleActivity(Activity activity) {
if (activity != null) {
if (activityList.contains(activity)) {
activityList.remove(activity);
}
activity.finish();
activity = null;
}
}

/**
* 结束指定类名的Activity 在遍历一个列表的时候不能执行删除操作，所有我们先记住要删除的对象，遍历之后才去删除。
*/
public static void finishSingleActivityByClass(Class<?> cls) {
Activity tempActivity = null;
for (Activity activity : activityList) {
if (activity.getClass().equals(cls)) {
tempActivity = activity;
}
}

finishSingleActivity(tempActivity);
}
}