這裏對froyo(非標準)裏mms模塊收彩信的函數調用關係進行一點解說。這裏只說的是收到彩信,但是還沒有下載(設爲手工下載)
首先,mms是通過WAPPUSH實現的,具體在com.android.internal.telephony包裏的WapPushOverSms類。
這個類裏除了構造函數,另一個public的就是dispatchWapPdu()了
仔細查看下,就會找到dispatchWapPdu_MMS()這個函數
- private void dispatchWapPdu_MMS(byte[] pdu, int transactionId, int pduType,
- int headerStartIndex, int headerLength) {
- byte[] header = new byte[headerLength];
- System.arraycopy(pdu, headerStartIndex, header, 0, header.length);
- int dataIndex = headerStartIndex + headerLength;
- byte[] data = new byte[pdu.length - dataIndex];
- System.arraycopy(pdu, dataIndex, data, 0, data.length);
- Intent intent = new Intent(Intents.WAP_PUSH_RECEIVED_ACTION);
- intent.setType(WspTypeDecoder.CONTENT_MIME_TYPE_B_MMS);
- intent.putExtra("transactionId", transactionId);
- intent.putExtra("pduType", pduType);
- intent.putExtra("header", header);
- intent.putExtra("data", data);
- mSmsDispatcher.dispatch(intent, "android.permission.RECEIVE_MMS");
- }
注意別混了, mSmsDispatcher.dispatch的第二個參數不是action的意思,而是權限,實際這個intent的action就是Intents.WAP_PUSH_RECEIVED_ACTION
然後,mms包(com.android.mms.transaction)下的onReceive會得到這個intent,進行處理
在這個onReceive裏,會調用內部類去執行:
- new ReceivePushTask(context).execute(intent);
在這個內部類的doInBackground方法裏,則會再繼續根據pdu類型,來判斷如何處理
- Uri uri = p.persist(pdu, Inbox.CONTENT_URI, phoneId);
- // Start service to finish the notification transaction.
- Intent svc = new Intent(mContext, TransactionService.class);
- svc.putExtra(TransactionBundle.URI, uri.toString());
- svc.putExtra(TransactionBundle.TRANSACTION_TYPE,
- Transaction.NOTIFICATION_TRANSACTION);
- mContext.startService(svc);
在TransactionService裏,實際上會最終調用NotificationTransaction
- int type = PduHeaders.MESSAGE_TYPE_NOTIFICATION_IND;
- if ((ind != null) && (ind.getMessageType() == type)) {
- transaction = new NotificationTransaction(
- TransactionService.this, serviceId,
- transactionSettings, (NotificationInd) ind,phoneId);
- }
在NotificationTransaction裏,則會完成Notification事務
- // Don't try to download when data is suspended, as it will fail, so defer download
- if (!autoDownload || dataSuspended) {
- downloadManager.markState(mUri, DownloadManager.STATE_UNSTARTED);
- sendNotifyRespInd(status);
- return;
- }
到這裏(sendNotifyRespInd),這個事務應該算結束了。