平常我們開發(fā)的時(shí)候需要使用到動(dòng)態(tài)注冊(cè)廣播，如果在一個(gè)類內(nèi)注冊(cè)很多的廣播代碼就會(huì)既冗余又亂糟糟的，就像這樣：

msgReceiver = new NewMessageBroadcastReceiver();IntentFilter intentFilter = new IntentFilter(EMChatManager.getInstance().getNewMessageBroadcastAction());registerReceiver(msgReceiver, intentFilter);IntentFilter ackMessageIntentFilter = new IntentFilter(EMChatManager.getInstance().getAckMessageBroadcastAction());registerReceiver(ackMessageReceiver, ackMessageIntentFilter);IntentFilter cmdMessageIntentFilter = new IntentFilter(EMChatManager.getInstance().getCmdMessageBroadcastAction());registerReceiver(cmdMessageReceiver, cmdMessageIntentFilter); newMessageBroadcastReceiver = new NewMessageTipBroadcastReceiver();IntentFilter filter = new IntentFilter(StringConstants.NewMessageBroadcastReceiver);filter.addCategory(Intent.CATEGORY_DEFAULT);registerReceiver(newMessageBroadcastReceiver, filter);disTipBroadcastReceiver = new DisTipBroadcastReceiver();filter = new IntentFilter(StringConstants.DisTipBroadcastReceiver);filter.addCategory(Intent.CATEGORY_DEFAULT);registerReceiver(disTipBroadcastReceiver, filter);
上面是我們的注冊(cè)部分，除了我們需要將廣播的引用升級(jí)為類的成員之外，我們還需要添加解注代碼，就像下面這樣：

if (newMessageBroadcastReceiver != null) {unregisterReceiver(newMessageBroadcastReceiver);}if (disTipBroadcastReceiver != null) {unregisterReceiver(disTipBroadcastReceiver);}if (mJPushReceiver != null) {unregisterReceiver(mJPushReceiver);}if (newMessageBroadcastReciver != null) {unregisterReceiver(newMessageBroadcastReciver);}if (newTeacherMessageBroadcastReciver != null) {unregisterReceiver(newTeacherMessageBroadcastReciver);}if (newMessageUserCenterBroadcastReciver != null) {unregisterReceiver(newMessageUserCenterBroadcastReciver);}if (mUIRefreshReceiver != null) {unregisterReceiver(mUIRefreshReceiver);}
所以，我們需要一種極為簡(jiǎn)便的工具來完成這些工作，讓我們開發(fā)的時(shí)候不用去關(guān)心那么多不重要的東西：

package com.sahadev.commontools;import java.util.Map;import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.support.v4.util.ArrayMap;/*** 廣播注冊(cè)解注工具* * @author Sahadev**/ public class RegisterReceiverUtils {private static Map<Class<?>, BroadcastReceiver> MAPS = new ArrayMap<Class<?>, BroadcastReceiver>();/*** @param context* @param broadcastReceiverClass* @param action*/public static void registerBroadcastReceiver(Context context, Class<?> broadcastReceiverClass, String action) {IntentFilter filter = new IntentFilter(action);filter.addCategory(Intent.CATEGORY_DEFAULT);try {BroadcastReceiver broadcastReceiver = (BroadcastReceiver) broadcastReceiverClass.newInstance();if (broadcastReceiver != null) {MAPS.put(broadcastReceiverClass, broadcastReceiver);context.registerReceiver(broadcastReceiver, filter);}} catch (InstantiationException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();}}public static void unregisterBroadcastReceiver(Context context, Class<?> broadcastReceiverClass) {BroadcastReceiver broadcastReceiver = MAPS.get(broadcastReceiverClass);context.unregisterReceiver(broadcastReceiver);MAPS.remove(broadcastReceiverClass);}}
上面這個(gè)工具只是簡(jiǎn)單的對(duì)注冊(cè)解注做了簡(jiǎn)單的封裝，如果可以，我們可以開放開啟與關(guān)閉方法，與Activity這樣的組件的創(chuàng)建銷毀方法進(jìn)行關(guān)聯(lián)，以達(dá)到我們更簡(jiǎn)便的目的。

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