做项目的时候，涉及到一个注销登录的过程，这时候需要关闭之前打开的所有Activity。仅finish当前Activity显然是不够的，需要把返回栈中的Activity一个个销毁。我实践过的方法有两种：

1、基础类BaseActivity中注册广播接收器，接受关闭所有Activity的广播

2、基础类BaseActivity中将Activity加入一个集合中，并提供一个静态finishAll的方法统一关闭

备注：App中所有Activity直接或间接继承自BaseActivity。

一、使用广播接收器发送统一销毁广播

ExitAppReceiver 广播接收器代码：

public class ExitAppReceiver extendsBroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();if (action.equals("exit_app")){if (context != null){if (context instanceofActivity){((Activity)context).finish();}if (context instanceofService){((Service)context).stopSelf();}}}}
}

BaseActivity中注册销毁广播接收器：

public class BaseActivity extendsAppCompatActivity {private static final String TAG = "BaseActivity";private ExitAppReceiver exitAppReceiver;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);registerExitAppReceiver();//注册}@Overrideprotected void onDestroy() {super.onDestroy();unRegisterExitAppReceiver();//销毁}private void registerExitAppReceiver(){IntentFilter filter = new IntentFilter();filter.addAction("exit_app");exitAppReceiver = new ExitAppReceiver();registerReceiver(exitAppReceiver, filter);}private void unRegisterExitAppReceiver(){unregisterReceiver(exitAppReceiver);}
}

发送关闭所有Activity广播：

Intent intent = new Intent("exit_app");

sendBroadcast(intent);

二、采用ActivityCollector（方法参考郭霖《第一行代码》第2版）

ActivityCollector源码

public class ActivityCollector {public static List<Activity> list = new ArrayList<>();public static void addActivity(Activity activity){list.add(activity);}public static void removeActivity(Activity activity){list.remove(activity);}public static void finishAllActivity(){for (Activity activity :list) {if (!activity.isFinishing()){activity.finish();}}}
}

在BaseActivity中添加和移除：

   @Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);ActivityCollector.addActivity(this);}@Overrideprotected void onDestroy() {super.onDestroy();ActivityCollector.removeActivity(this);}