短信接收--短信的接收流程应用层
注意：SeviceHandler是SmsReceiverService的内部类，SmsReceiver是PrivlegedSmsReceiver的父类；3、详细分析3.1?PrivilegedSmsReceiver到SmsReceiverService1）PrivilegedSmsReceiver这个接收器从中间才能获取数据? ? ?PrivilegedSmsReceiver是一个广播接收器并且继承自SmsReceiver，在AndroidManifest.xml 中有如下声明：
?说 明在insertMessage方法时会判断当前是替换还是插入，对于替换短信，笔者不是很清楚在什么情况下会走这条路。 blockingUpdateNewMessageIndicator方法会用notification提醒用户，并且在方法内会判断当前用户是否需要显 示发送报告。?3.2 刷新会话列表? ? ? ? 走到上面的代码，短信已经入库，但界面的刷新是如何实现的了？1）会话列表的初始化? ? ? ??ConversationList继承自ListActivity，用于显示短信的会话列表，在该类的onStart方法里有调用了一个重要的方法startAsyncQuery（）方法：[plain] view plaincopy

1. private?void?startAsyncQuery()?{??????try?{??
2. ????????setTitle(getString(R.string.refreshing));??????????setProgressBarIndeterminateVisibility(true);??
3. ??????????Conversation.startQueryForAll(mQueryHandler,?THREAD_LIST_QUERY_TOKEN);??
4. ????}?catch?(SQLiteException?e)?{??????????SqliteWrapper.checkSQLiteException(this,?e);??
5. ????}??}??

解析：startQueryForAll方法定义：[plain] view plaincopy

1. public?static?void?startQueryForAll(AsyncQueryHandler?handler,?int?token)?{??????handler.cancelOperation(token);??
2. ????handler.startQuery(token,?null,?sAllThreadsUri,??????????????ALL_THREADS_PROJECTION,?null,?null,?Conversations.DEFAULT_SORT_ORDER);??
3. }??

这里会使用mQueryHandler去查询数据库，查询完后会回调该对象的onQueryComplete方法，在该方法里填充了mListAdapter，使得会话列表得以显示到界面上。以下代码是其定义：[plain] view plaincopy

1. private?final?class?ThreadListQueryHandler?extends?AsyncQueryHandler?{??????????public?ThreadListQueryHandler(ContentResolver?contentResolver)?{??
2. ????????????super(contentResolver);??????????}??
3. ????????@Override??????????protected?void?onQueryComplete(int?token,?Object?cookie,?Cursor?cursor)?{??
4. ????????????switch?(token)?{??????????????case?THREAD_LIST_QUERY_TOKEN:??
5. ????????????????mListAdapter.changeCursor(cursor);??????????????????setTitle(mTitle);??
6. ????????????????setProgressBarIndeterminateVisibility(false);????
7. ????????????????if?(mNeedToMarkAsSeen)?{??????????????????????mNeedToMarkAsSeen?=?false;??
8. ????????????????????Conversation.markAllConversationsAsSeen(getApplicationContext());??????????????????????//?Database?will?be?update?at?this?time?in?some?conditions.??
9. ????????????????????//?Wait?1s?and?ensure?update?complete.??????????????????????mQueryHandler.postDelayed(new?Runnable()?{??
10. ????????????????????????public?void?run()?{??????????????????????????????//?Delete?any?obsolete?threads.?Obsolete?threads?are?threads?that?aren't??
11. ????????????????????????????//?referenced?by?at?least?one?message?in?the?pdu?or?sms?tables.??????????????????????????????Conversation.asyncDeleteObsoleteThreads(mQueryHandler,??
12. ????????????????????????????????????DELETE_OBSOLETE_THREADS_TOKEN);??????????????????????????}??
13. ????????????????????},?1000);??????????????????}??
14. ????????????????break;?????????????????????????default:??
15. ????????????????Log.e(TAG,?"onQueryComplete?called?with?unknown?token?"?+?token);??????????????}??
16. ????????}????
17. ???????????}??

这里为什么要特别提到该对象了，后面更新的操作与它有着密不可分的关系。mListAdapter该对象是ConversationListAdapter的对象，该对象在ConversationList的oncreate方法里调用?initListAdapter()进行的初始化。?initListAdapter()对adapter进行初始化：[plain] view plaincopy

1. private?void?initListAdapter()?{?????????mListAdapter?=?new?ConversationListAdapter(this,?null);??
2. ???????mListAdapter.setOnContentChangedListener(mContentChangedListener);?????????setListAdapter(mListAdapter);??
3. ???????getListView().setRecyclerListener(mListAdapter);?????}??

mListAdapter.setOnContentChangedListener(mContentChangedListener);是当adapter的内容发生变化，会去执行监听器的onContentChanged的方法。那为了弄清楚mContentChangedListener的定义，查看以下代码：[plain] view plaincopy

1. private?final?ConversationListAdapter.OnContentChangedListener?mContentChangedListener?=???????new?ConversationListAdapter.OnContentChangedListener()?{??
2. ?????public?void?onContentChanged(ConversationListAdapter?adapter)?{???????????startAsyncQuery();??
3. ?????}???};??

重新调用startAsyncQuery() 该方法刷新。
?2）会话列表的更新
? ? ? ? ?看到上面监听器所做的工作大家应该明白啦，会话列表的更新靠的就是这个监听器，当内容发生改变就会重新查询，界面进行刷新，到此为止 短信的界面刷新完成。特 别注意：该情况是用户在短信会话列表这个界面，如果不在这个界面大概还有其他两种情况：? 1、在某个会话中；2、没有进入mms程序。对于前一种情况会在下面继续分析，对于后一种情况我想也不用多说在这种情况下会走activity的声明周期 函数，在onstart方法里进行查询显示前面已经提到。那还有一种特殊的情况就是在从某个会话中返回到会话列表时的处理。下面请看ConversationList的声明：
[plain] view plaincopy

1. <activity?android:name=".ui.ConversationList"??????????????android:label="@string/app_label"??
2. ????????????android:configChanges="orientation|keyboardHidden"??????????????android:launchMode="singleTop">??

属性是singleTop，大家都知道这种情况会去调用onNewIntent方法：[plain] view plaincopy

1. @Override????protected?void?onNewIntent(Intent?intent)?{??
2. ??????//?Handle?intents?that?occur?after?the?activity?has?already?been?created.????????startAsyncQuery();??
3. ??}??

该方法又会去重新查询刷新界面。

3.23刷新会话内容刷新ui除了刷新会话列表之外，还有一种情况就是当用户在某个会话时，这时该会话接收到新的消息，这时需要刷新会话的内容，这是怎么实现的？?用于会话显示的activity：ComposeMessageActivity；用于显示会话的短信内容组件：?MessageListView；填充listview的adapter是：MessageListAdapter1）初始化ComposeMessageActivity的onCreate方法调用initialize方法，initialize方法再调用initMessageList（）完成初始化[plain] view plaincopy

1. private?void?initMessageList()?{??????if?(mMsgListAdapter?!=?null)?{??
2. ????????return;??????}??
3. ????String?highlightString?=?getIntent().getStringExtra("highlight");??????Pattern?highlight?=?highlightString?==?null??
4. ??????????null??????????:?Pattern.compile("\\b"?+?Pattern.quote(highlightString),?Pattern.CASE_INSENSITIVE);??
5. ????//?Initialize?the?list?adapter?with?a?null?cursor.??????mMsgListAdapter?=?new?MessageListAdapter(this,?null,?mMsgListView,?true,?highlight);??
6. ????mMsgListAdapter.setOnDataSetChangedListener(mDataSetChangedListener);??????mMsgListAdapter.setMsgListItemHandler(mMessageListItemHandler);??
7. ????mMsgListView.setAdapter(mMsgListAdapter);??????mMsgListView.setItemsCanFocus(false);??
8. ????mMsgListView.setVisibility(View.VISIBLE);??????mMsgListView.setOnCreateContextMenuListener(mMsgListMenuCreateListener);??
9. ????mMsgListView.setOnItemClickListener(new?AdapterView.OnItemClickListener()?{??????????public?void?onItemClick(AdapterView<?>?parent,?View?view,?int?position,?long?id)?{??
10. ????????????if?(view?!=?null)?{??????????????????((MessageListItem)?view).onMessageListItemClick();??
11. ????????????}??????????}??
12. ????});??}??

说明：MessageListAdapter定义了一个监听器当数据发生变化的时候回调监听器的onContentChanged的方法，该方法会重新查询该会话相关的内容并刷新显示，以下是其定义：[plain] view plaincopy

1. private?final?MessageListAdapter.OnDataSetChangedListener??????????????????mDataSetChangedListener?=?new?MessageListAdapter.OnDataSetChangedListener()?{??
2. ????public?void?onDataSetChanged(MessageListAdapter?adapter)?{??????????mPossiblePendingNotification?=?true;??
3. ????}??????public?void?onContentChanged(MessageListAdapter?adapter)?{??
4. ????????startMsgListQuery();??????}??
5. };??

?2）MessageListAdapter内容的初始化ComposeMessageActivity 的onStart函数里面调用一个重要的方法loadMessageContent();该方法会继续调用startMsgListQuery()，在上 面的adapter的监听器里当内容有变动时回调函数也会调用该方法，以下代码是该方法做的具体工作：[plain] view plaincopy

1. private?void?startMsgListQuery()?{??????Uri?conversationUri?=?mConversation.getUri();??
2. ????if?(conversationUri?==?null)?{??????????return;??
3. ????}??????if?(Log.isLoggable(LogTag.APP,?Log.VERBOSE))?{??
4. ????????log("for?"?+?conversationUri);??????}??
5. ????//?Cancel?any?pending?queries??????mBackgroundQueryHandler.cancelOperation(MESSAGE_LIST_QUERY_TOKEN);??
6. ????try?{??????????//?Kick?off?the?new?query??
7. ????????mBackgroundQueryHandler.startQuery(??????????????????MESSAGE_LIST_QUERY_TOKEN,?null,?conversationUri,??
8. ????????????????PROJECTION,?null,?null,?null);??????}?catch?(SQLiteException?e)?{??
9. ????????SqliteWrapper.checkSQLiteException(this,?e);??????}??
10. }??

分析：该方法所做的工作就是使用mBackgroundQueryHandler查询数据库（mBackgroundQueryHandler是一个AsyncQueryHandler的对象），查询完成后会回调mBackgroundQueryHandler该对象的onQueryComplete方法，以下是其核心代码：[plain] view plaincopy

1. @Override??????????protected?void?onQueryComplete(int?token,?Object?cookie,?Cursor?cursor)?{??
2. ????????????switch(token)?{??????????????????case?MESSAGE_LIST_QUERY_TOKEN:??
3. ????????????????????//?Set?last?sub?used?in?this?conversation?thread.??????????????????????if?(cursor.getCount()?>?0)?{??
4. ????????????????????????cursor.moveToLast();??????????????????????????mLastSubInConv?=?cursor.getInt(COLUMN_SUB_ID);?//TODO:?ADD?SUBSCRIPION?HERE??
5. ????????????????????????cursor.moveToPosition(-1);??????????????????????}?else?{??
6. ????????????????????????mLastSubInConv?=?SUBSCRIPTION_ID_INVALID;??????????????????????}??
7. ????????????????????int?newSelectionPos?=?-1;??????????????????????long?targetMsgId?=?getIntent().getLongExtra("select_id",?-1);??
8. ????????????????????if?(targetMsgId?!=?-1)?{??????????????????????????cursor.moveToPosition(-1);??
9. ????????????????????????while?(cursor.moveToNext())?{??????????????????????????????long?msgId?=?cursor.getLong(COLUMN_ID);??
10. ????????????????????????????if?(msgId?==?targetMsgId)?{??????????????????????????????????newSelectionPos?=?cursor.getPosition();??
11. ????????????????????????????????break;??????????????????????????????}??
12. ????????????????????????}??????????????????????}??
13. ????????????????????mMsgListAdapter.changeCursor(cursor);??????????????????????if?(newSelectionPos?!=?-1)?{??
14. ????????????????????????mMsgListView.setSelection(newSelectionPos);??????????????????????}??
15. ????????????????????if?(cursor.getCount()?==?0?&&?!isRecipientsEditorVisible()?&&?!mSentMessage)?{??????????????????????????initRecipientsEditor();??
16. ????????????????????}??????????????????????mTextEditor.requestFocus();??
17. ????????????????????mConversation.blockMarkAsRead(false);??????????????????????mConversation.setMessageCount(cursor.getCount());??
18. ????????????????????return;????
19. ????????????}??????????}??

代码虽多，但其核心就是对mMsgListAdapter的内容重新赋值刷新界面完毕。3）刷新? ? 刷新就很简单啦，当数据有变化的时候会触发OnDataSetChangedListener这个监听器，这个监听器会调用onContentChanged函数重新查询达到刷新的效果。

4、总结? ? ?短信的接收大致过程就是这样，对于上面提到的替换短信，该情况暂时不清楚，有些细节描述的很粗糙，希望大家多提意见，一起研究研究