Android系统应用Mms之短信会话列表加载流程一
1. ConversationList短息会话列表界面 1. 开始进行加载 ConversationList: protected void onStart(){ ... // 进行异步查询 startAsyncQuery(); } private void startAsyncQuery() { ... // 加载消息 mLoaderFragment.reLoadMessage(THREAD_LIST_QUERY_TOKEN, // token: 1701 Conversation.sAllThreadsUri,// 查询的Uri: content://mms-sms/conversations&simple=true Conversation.ALL_THREADS_PROJECTION,// 查询的字段 null, null, Conversations.DEFAULT_SORT_ORDER); ... } 2. 进入到MessageLoaderFragment, 进行加载 MessageLoaderFragment: public void reLoadMessage(int loadId, Uri uri, String[] projection, String selection, String[] selectionArgs, String orderBy) { ... // 进行异步加载 getLoaderManager().restartLoader(loadId, null, mMessageLoaderListener); } 3. 进入到MmsSmsProvider中执行查询流程 MmsSmsProvider: public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { ... switch(URI_MATCHER.match(uri)) { ... case URI_CONVERSATIONS: String simple = uri.getQueryParameter("simple"); if ((simple != null) && simple.equals("true")) { String threadType = uri.getQueryParameter("thread_type"); // 获取会话类型 if (!TextUtils.isEmpty(threadType)) { selection = concatSelections(selection, Threads.TYPE + "=" + threadType); } // 获取简单会话 cursor = getSimpleConversations(projection, selection, selectionArgs, sortOrder); } else { cursor = getConversations(projection, selection, sortOrder); } break; ... } ... return cursor; } private Cursor getSimpleConversations(String[] projection, String selection, String[] selectionArgs, String sortOrder) { // 到此处已完成会话的查询, 接下来看数据的填充 return mOpenHelper.getReadableDatabase().query(TABLE_THREADS, // threads数据库 projection, selection, selectionArgs, null, null, " date DESC"); } 4. 数据加载完成后回调到MessageLoaderFragment$LoaderManager.LoaderCallbacks<Cursor>中 MessageLoaderFragment$LoaderManager.LoaderCallbacks<Cursor>: public void onLoadFinished(Loader<Cursor> loader, Cursor data) { ... // 数据加载完成回调到ConversationList中 mListener.onMessageLoaded(data, loader); } 5. 数据回调到ConversationList$MessageLoaderFragmentListener中 ConversationList$MessageLoaderFragmentListener: public void onMessageLoaded(Cursor cursor, Loader<Cursor> loader) { // 更新UI mListAdapter.changeCursor(cursor); ... } 短信会话列表加载涉及到的数据库: MmsSmsDatabaseHelper: 数据库名: MmsSmsProvider: static final String TABLE_THREADS = "threads" 数据库的创建: private void createCommonTables(SQLiteDatabase db) { ... db.execSQL("CREATE TABLE threads (" + Threads._ID + " INTEGER PRIMARY KEY AUTOINCREMENT," +// id Threads.DATE + " INTEGER DEFAULT 0," + // 时间 Threads.MESSAGE_COUNT + " INTEGER DEFAULT 0," + // 消息数量 Threads.RECIPIENT_IDS + " TEXT," + // 接受者ID Threads.SNIPPET + " TEXT," + // 片段 Threads.SNIPPET_CHARSET + " INTEGER DEFAULT 0," + // 片段编码 Threads.READ + " INTEGER DEFAULT 1," + // 是否已读 Threads.TYPE + " INTEGER DEFAULT 0," + // 类型 Threads.ERROR + " INTEGER DEFAULT 0," + // 是否有错 Threads.HAS_ATTACHMENT + " INTEGER DEFAULT 0," + // 是否有附件 Threads.RECIPIENT_ADDRESSES + " TEXT, " + // 接受者地址 Threads.RECIPIENT_NAMES + " TEXT ); "); // 接受者姓名 }