相关控件初始化方法：showSmscPref

  private void  showSmscPref () {

        int count = MSimTelephonyManager.getDefault().getPhoneCount();
        boolean airplaneModeOn = Settings.System.getInt(getContentResolver(),
                Settings.System.AIRPLANE_MODE_ON, 0) != 0;
        for (int i = 0; i < count; i++) {

            final Preference pref = new Preference(this);
            pref.setKey(String.valueOf(i));
            String title = (count <= 1) ?

getString(R.string.pref_one_smcs)

                    : getString(R.string.pref_more_smcs, i + 1);             pref.setTitle(title);             pref.setOnPreferenceClickListener(new OnPreferenceClickListener() {

                @Override

                public boolean onPreferenceClick(Preference preference) {

                    MyEditDialogFragment dialog = MyEditDialogFragment.newInstance(

                            MessagingPreferenceActivity.this,

                            preference.getTitle(),

                            preference.getSummary(),

                            Integer.valueOf(preference.getKey()));

                    dialog.show(getFragmentManager(), "dialog");

                    return true;

                }

            });             mSmscPrefCate.addPreference(pref);             mSmscPrefList.add(pref);             updateSMSCPref(i, airplaneModeOn);         }         registerReceiver();

    }

这里使用了一个内部类MyEditDialogFragment，该类继承了DialogFragment。

public static class MyEditDialogFragment extends DialogFragment {

        private MessagingPreferenceActivity mActivity;         public static MyEditDialogFragment newInstance(MessagingPreferenceActivity activity,                 CharSequence title, CharSequence smsc, int sub) {             MyEditDialogFragment dialog = new MyEditDialogFragment();             dialog.mActivity = activity;             Bundle args = new Bundle();             args.putCharSequence(TITLE, title);             args.putCharSequence(SMSC, smsc);             args.putInt(SUB, sub);             dialog.setArguments(args);             return dialog;         }         @Override         public Dialog onCreateDialog(Bundle savedInstanceState) {             final int sub = getArguments().getInt(SUB);             if (null == mActivity) {                 mActivity = (MessagingPreferenceActivity) getActivity();                 dismiss();             }             final EditText edit = new EditText(mActivity);             edit.setPadding(15, 15, 15, 15);             edit.setText(getArguments().getCharSequence(SMSC));             Dialog alert = new AlertDialog.Builder(mActivity)

                    .setTitle(getArguments().getCharSequence(TITLE))

                    .setView(edit)

                    .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {

                        public void onClick(DialogInterface dialog, int whichButton) {

                            MyAlertDialogFragment newFragment = MyAlertDialogFragment.newInstance(

                                    mActivity, sub, edit.getText().toString());

                            newFragment.show(getFragmentManager(), "dialog");

                            dismiss();

                        }

                    })

                    .setNegativeButton(android.R.string.cancel, null)

                    .setCancelable(true)

                    .create();             alert.getWindow().setSoftInputMode(                     WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);             return alert;         }     }上述代码调用了还有一个内部类：《TAG 1-2》

 public static class MyAlertDialogFragment extends DialogFragment {

        private MessagingPreferenceActivity mActivity;         public static MyAlertDialogFragment newInstance(MessagingPreferenceActivity activity,                                                         int sub, String smsc) {             MyAlertDialogFragment dialog = new MyAlertDialogFragment();             dialog.mActivity = activity;             Bundle args = new Bundle();             args.putInt(SUB, sub);             args.putString(SMSC, smsc);             dialog.setArguments(args);             return dialog;         }         @Override         public Dialog onCreateDialog(Bundle savedInstanceState) {             final int sub = getArguments().getInt(SUB);             final String displayedSMSC = getArguments().getString(SMSC);             // When framework re-instantiate this fragment by public empty             // constructor and call onCreateDialog(Bundle savedInstanceState) ,             // we should make sure mActivity not null.             if (null == mActivity) {                 mActivity = (MessagingPreferenceActivity) getActivity();             }             return new AlertDialog.Builder(mActivity)                     .setIcon(android.R.drawable.ic_dialog_alert).setMessage(                             R.string.set_smsc_confirm_message)                     .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {                         public void onClick(DialogInterface dialog, int whichButton) {

                            Intent intent = new Intent();

                            intent.setComponent(new ComponentName("com.android.phonefeature",

                                    "com.android.phonefeature.smsc.SmscService"));

                            intent.setAction(COMMAND_SET_SMSC);

                            intent.putExtra(SUB, sub);

                            intent.putExtra(SMSC, displayedSMSC);

                            mActivity.startService(intent);

                        }                     })                     .setNegativeButton(android.R.string.cancel, null)                     .setCancelable(true)                     .create();         }     }当用户点击确认（OK）后，会启动一个SmscService服务，而且把改动后的smsc number封装到intent中去，在SmscService服务中的onStartCommand将Intent中的数加入到消息队列中进行处理。     public int onStartCommand(Intent intent, int flags, int startId) {         int sub = intent.getIntExtra(SUB, 0);         int count = MSimTelephonyManager.getDefault().getPhoneCount();         Phone phone = count > 1 ? MSimPhoneFactory.getPhone(sub)                 : PhoneFactory.getDefaultPhone();         if (phone == null) return START_STICKY;         boolean enable = phone.getIccCard().hasIccCard();         Intent i = new Intent();         i.setAction(NOTIFY_PHONE_STATE);         i.putExtra(SUB, sub);         i.putExtra(ENABLE, enable);         sendBroadcast(i);         String action = intent.getAction();         Message msg;         if (COMMAND_GET_SMSC.equals(action)) {             msg = mHandler.obtainMessage(MSG_GET_SMSC);             msg.arg1 = sub;             phone.getSmscAddress(msg);         } else if (COMMAND_SET_SMSC.equals(action)) {             msg = mHandler.obtainMessage(MSG_SET_SMSC);

            msg.arg1 = sub;

            String displayedSMSC = intent.getStringExtra(SMSC);

            Bundle bundle = new Bundle();

            bundle.putString(SMSC, displayedSMSC);

            msg.setData(bundle);

            String actualSMSC = adjustSMSC(displayedSMSC);

            phone.setSmscAddress(actualSMSC, msg);         }         return START_STICKY;     }

上述代码中的phone。通过验证分析，得到phone为GSMPhone的实例，验证的代码为PhoneFactory类中的makeDefaultPhone方法进行验证得到（我这里验证的结果为GSM：

 public static void makeDefaultPhone(Context context) {<TAG 1-1>

        synchronized(Phone.class) {             if (!sMadeDefaults) {                 sLooper = Looper.myLooper();                 sContext = context;                 if (sLooper == null) {                     throw new RuntimeException(                         "PhoneFactory.makeDefaultPhone must be called from Looper thread");                 }                 int retryCount = 0;                 for(;;) {                     boolean hasException = false;                     retryCount ++;                     try {                         // use UNIX domain socket to                         // prevent subsequent initialization                         new LocalServerSocket("com.android.internal.telephony");                     } catch (java.io.IOException ex) {                         hasException = true;                     }                     if ( !hasException ) {                         break;                     } else if (retryCount > SOCKET_OPEN_MAX_RETRY) {                         throw new RuntimeException("PhoneFactory probably already running");                     } else {                         try {                             Thread.sleep(SOCKET_OPEN_RETRY_MILLIS);                         } catch (InterruptedException er) {                         }                     }                 }                 sPhoneNotifier = new DefaultPhoneNotifier();                 // Get preferred network mode                 int preferredNetworkMode = RILConstants.PREFERRED_NETWORK_MODE;                 if (TelephonyManager.getLteOnCdmaModeStatic() == PhoneConstants.LTE_ON_CDMA_TRUE) {                     preferredNetworkMode = Phone.NT_MODE_GLOBAL;                 }                 int networkMode = Settings.Global.getInt(context.getContentResolver(),                         Settings.Global.PREFERRED_NETWORK_MODE, preferredNetworkMode);                 Rlog.i(LOG_TAG, "Network Mode set to " + Integer.toString(networkMode));                 // As per certain operator requirement, the device is expected to be in global《TAG 1-2》                 // mode from boot up, by enabling the property persist.env.phone.global the                 // network mode is set to global during boot up.                 if (SystemProperties.getBoolean("persist.env.phone.global", false)) {                     networkMode = Phone.NT_MODE_LTE_CMDA_EVDO_GSM_WCDMA;                     Settings.Global.putInt(context.getContentResolver(),                             Settings.Global.PREFERRED_NETWORK_MODE, networkMode);                 }                 // Get cdmaSubscription mode from Settings.Global                 int cdmaSubscription;                 cdmaSubscription = Settings.Global.getInt(context.getContentResolver(),                                 Settings.Global.CDMA_SUBSCRIPTION_MODE,                                 sPreferredCdmaSubscription);                 Rlog.i(LOG_TAG, "Cdma Subscription set to " + cdmaSubscription);                 //reads the system properties and makes commandsinterface                 sCommandsInterface = new RIL(context, networkMode, cdmaSubscription);                 // Instantiate UiccController so that all other classes can just call getInstance()                 UiccController.make(context, sCommandsInterface);                 int phoneType = TelephonyManager.getPhoneType(networkMode);                 if (phoneType == PhoneConstants.PHONE_TYPE_GSM) {                     Rlog.i(LOG_TAG, "Creating GSMPhone");                     sProxyPhone = new PhoneProxy(new GSMPhone(context,

                            sCommandsInterface, sPhoneNotifier));

                            android.util.Log.d("bill","GSM");                 } else if (phoneType == PhoneConstants.PHONE_TYPE_CDMA) {                     switch (TelephonyManager.getLteOnCdmaModeStatic()) {                         case PhoneConstants.LTE_ON_CDMA_TRUE:                             Rlog.i(LOG_TAG, "Creating CDMALTEPhone");                             sProxyPhone = new PhoneProxy(new CDMALTEPhone(context,                                 sCommandsInterface, sPhoneNotifier));                                 android.util.Log.d("bill","CDMALTE");                             break;                         case PhoneConstants.LTE_ON_CDMA_FALSE:                         default:                             Rlog.i(LOG_TAG, "Creating CDMAPhone");                             sProxyPhone = new PhoneProxy(new CDMAPhone(context,                                     sCommandsInterface, sPhoneNotifier));                                     android.util.Log.d("bill","CDMA");                             break;                     }                 }                 sMadeDefaults = true;             }         }     }

可是GSMPhone中并没有setSmscAddress（）方法，可是GSMPhone继承了BasePhone类，因此我们在BasePhone中找到了setSmscAddress（）方法。     @Override     public void setSmscAddress(String address, Message result) {         mCi.setSmscAddress(address, result);     }

上述代码中的mCi为接口CommandsInterface的实例。mCi的所引用的实例为BasePhone构造函数中传递过来的，因此我们代码<TAG1-1>中找到了该实例为RIL的实例。因此我们在RIL类中找到了setSmscAddress方法；

    @Override

    public void setSmscAddress(String address, Message result) {         RILRequest rr = RILRequest.obtain(RIL_REQUEST_SET_SMSC_ADDRESS, result);

        rr.mParcel.writeString(address);

        if (RILJ_LOGD) riljLog(rr.serialString() + "> " + requestToString(rr.mRequest)

                + " : " + address);

        send(rr);     }

    private void

    send(RILRequest rr) {

        Message msg;         if (mSocket == null) {             rr.onError(RADIO_NOT_AVAILABLE, null);             rr.release();             return;         }         msg = mSender.obtainMessage(EVENT_SEND, rr);         acquireWakeLock();         msg.sendToTarget();     }

在上述代码中send（）方法会发消息给RIL中RILSender进行处理,同一时候msg中封装了MSG_SET_SMSC，在RIL的RILSender中运行写卡操作，同一时候发消息给SmscService。

 //***** Handler implementation

        @Override public void         handleMessage(Message msg) {             RILRequest rr = (RILRequest)(msg.obj);             RILRequest req = null;             switch (msg.what) {                 case EVENT_SEND:                     /**                      * mRequestMessagePending++ already happened for every                      * EVENT_SEND, thus we must make sure                      * mRequestMessagePending-- happens once and only once                      */                     boolean alreadySubtracted = false;                     try {                         LocalSocket s;                         s = mSocket;                         if (s == null) {                             rr.onError(RADIO_NOT_AVAILABLE, null);                             rr.release();                             if (mRequestMessagesPending > 0)                                 mRequestMessagesPending--;                             alreadySubtracted = true;                             return;                         }                         synchronized (mRequestList) {                             mRequestList.add(rr);                             mRequestMessagesWaiting++;                         }                         if (mRequestMessagesPending > 0)                             mRequestMessagesPending--;                         alreadySubtracted = true;                         byte[] data;                         data = rr.mParcel.marshall();                         rr.mParcel.recycle();                         rr.mParcel = null;                         if (data.length > RIL_MAX_COMMAND_BYTES) {                             throw new RuntimeException(                                     "Parcel larger than max bytes allowed! "                                                           + data.length);                         }                         // parcel length in big endian                         dataLength[0] = dataLength[1] = 0;                         dataLength[2] = (byte)((data.length >> 8) & 0xff);                         dataLength[3] = (byte)((data.length) & 0xff);                         //Rlog.v(RILJ_LOG_TAG, "writing packet: " + data.length + " bytes");                         s.getOutputStream().write(dataLength);                         s.getOutputStream().write(data);                     } catch (IOException ex) {                         Rlog.e(RILJ_LOG_TAG, "IOException", ex);                         req = findAndRemoveRequestFromList(rr.mSerial);                         // make sure this request has not already been handled,                         // eg, if RILReceiver cleared the list.                         if (req != null || !alreadySubtracted) {                             rr.onError(RADIO_NOT_AVAILABLE, null);                             rr.release();                         }                     } catch (RuntimeException exc) {                         Rlog.e(RILJ_LOG_TAG, "Uncaught exception ", exc);                         req = findAndRemoveRequestFromList(rr.mSerial);                         // make sure this request has not already been handled,                         // eg, if RILReceiver cleared the list.                         if (req != null || !alreadySubtracted) {                             rr.onError(GENERIC_FAILURE, null);                             rr.release();                         }                     } finally {                         // Note: We are "Done" only if there are no outstanding                         // requests or replies. Thus this code path will only release                         // the wake lock on errors.                         releaseWakeLockIfDone();                     }                     if (!alreadySubtracted && mRequestMessagesPending > 0) {                         mRequestMessagesPending--;                     }                     break;

这里进行推断写卡操作是否成功，并发送广播。

    private Handler mHandler = new Handler() {

        @Override         public void handleMessage(Message msg) {             AsyncResult ar = (AsyncResult) msg.obj;             String smsc = null;             switch (msg.what) {                 case MSG_SET_SMSC:                     if (ar.exception != null) {                         notifyChange(NOTIFY_SMSC_ERROR, null, 0);                         return;                     } else {

                        Bundle bundle = msg.getData();

                        smsc = bundle.getString(SMSC);

                        notifyChange(NOTIFY_SMSC_SUCCESS, null, 0);

                    }                     break;

    private void notifyChange(String notify, String smsc, int sub) {

        Intent intent = new Intent(notify);         intent.putExtra(SMSC, smsc);         intent.putExtra(SUB, sub);         sendBroadcast(intent);     }

我们在MessagingPreferenceActivity的registerReceiver（）方法中注冊广播接收器进行监听。

 private void registerReceiver() {

        if (mReceiver != null) return;         mReceiver = new BroadcastReceiver() {             @Override             public void onReceive(Context context, Intent intent) {                 String action = intent.getAction();                 if (Intent.ACTION_AIRPLANE_MODE_CHANGED.equals(action)) {                     /*AddBy:yabin.huang BugID:SWBUG00029352 Date:20140521*/                     updateSMSCPref(ALL_SUB, isAirplaneModeOn());                     Message msg = new Message();                     msg.what = AIR_PLANE_MODE_CHANGED;                     msg.arg1 = (isAirplaneModeOn() ?

AIR_PLANE_MODE_ENABLE : AIR_PLANE_MODE_DISABLE);

                    mAirPlaneModeHandler.sendMessage(msg);                 } else if(TelephonyIntents.ACTION_SIM_STATE_CHANGED.equals(action)){                     if(isSimReady())                     updateSMSCPref(ALL_SUB, isAirplaneModeOn());                 } else if (NOTIFY_SMSC_ERROR.equals(action)) {

                    showToast(R.string.set_smsc_error);

                } else if (NOTIFY_SMSC_SUCCESS.equals(action)) {

                    showToast(R.string.set_smsc_success);

                    int sub = intent.getIntExtra(SUB, 0);

                    String summary = intent.getStringExtra(SMSC);

                    Log.d("bill","summary--"+summary);

                    mSmscPrefList.get(sub).setSummary(summary);                 } else if (NOTIFY_SMSC_UPDATE.equals(action)) {                     int sub = intent.getIntExtra(SUB, 0);                     if(TextUtils.isEmpty(mSmscPrefList.get(sub).getSummary())){                         String summary = intent.getStringExtra(SMSC);                         if(summary==null||summary.length()==0){                             updateSMSCPref(ALL_SUB, isAirplaneModeOn());                             mSmscPrefList.get(sub).setEnabled(false);                             mSmscPrefList.get(sub).setSummary(null);                         }else{                             mSmscPrefList.get(sub).setEnabled(true);                             mSmscPrefList.get(sub).setSummary(summary);                         }                     }else{                         mSmscPrefList.get(sub).setEnabled(true);                     }                 }             }         };         IntentFilter filter = new IntentFilter();         filter.addAction(TelephonyIntents.ACTION_SIM_STATE_CHANGED);         filter.addAction(Intent.ACTION_AIRPLANE_MODE_CHANGED);         filter.addAction(NOTIFY_SMSC_ERROR);         filter.addAction(NOTIFY_SMSC_SUCCESS);         filter.addAction(NOTIFY_SMSC_UPDATE);         registerReceiver(mReceiver, filter);     }

至今。改变整个过程的短信中心号码被整理完毕。