本文主要是介绍intel手机信号的强度变化追溯，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
最开始
public int getGsmLevel() {int level;// ASU ranges from 0 to 31 - TS 27.007 Sec 8.5// asu = 0 (-113dB or less) is very weak// signal, its better to show 0 bars to the user in such cases.// asu = 99 is a special case, where the signal strength is unknown.int asu = getGsmSignalStrength();if (asu <= 2 || asu == 99) level = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;else if (asu >= 12) level = SIGNAL_STRENGTH_GREAT;else if (asu >= 8) level = SIGNAL_STRENGTH_GOOD;else if (asu >= 5) level = SIGNAL_STRENGTH_MODERATE;else level = SIGNAL_STRENGTH_POOR;if (DBG) log("getGsmLevel=" + level);log("getGsmLevel=" + level); return level;}然后转到
public int getLevel() {int level;if (isGsm) {level = getLteLevel();if (level == SIGNAL_STRENGTH_NONE_OR_UNKNOWN) {log("matt2" + level); level = getGsmLevel();}} else {int cdmaLevel = getCdmaLevel();int evdoLevel = getEvdoLevel();if (evdoLevel == SIGNAL_STRENGTH_NONE_OR_UNKNOWN) {/* We don't know evdo, use cdma */level = cdmaLevel;} else if (cdmaLevel == SIGNAL_STRENGTH_NONE_OR_UNKNOWN) {/* We don't know cdma, use evdo */level = evdoLevel;} else {/* We know both, use the lowest level */level = cdmaLevel < evdoLevel ? cdmaLevel : evdoLevel;}}if (DBG) log("getLevel=" + level);return level;}
然后转到
public void notePhoneSignalStrengthLocked(SignalStrength signalStrength) {// Bin the strength.int bin = signalStrength.getLevel();Log.i("matts-notePhoneSignalStrengthLocked", "Phone Data Connection -> " );updateAllPhoneStateLocked(mPhoneServiceStateRaw, mPhoneSimStateRaw, bin);}
然后转到
public void notePhoneSignalStrength(SignalStrength signalStrength) {enforceCallingPermission();synchronized (mStats) {Slog.i("matts-notePhoneSignalStrength", "SENDING BATTERY INFO:");mStats.notePhoneSignalStrengthLocked(signalStrength);}}然后转到
private void broadcastSignalStrengthChanged(SignalStrength signalStrength) {long ident = Binder.clearCallingIdentity();try {mBatteryStats.notePhoneSignalStrength(signalStrength);} catch (RemoteException e) {/* The remote entity disappeared, we can safely ignore the exception. */} finally {Binder.restoreCallingIdentity(ident);}Intent intent = new Intent(TelephonyIntents2.ACTION_SIGNAL_STRENGTH_CHANGED);intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);Bundle data = new Bundle();signalStrength.fillInNotifierBundle(data);intent.putExtras(data);mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL);}然后转到
public void notifySignalStrength(SignalStrength signalStrength) {if (!checkNotifyPermission("notifySignalStrength()")) {return;}synchronized (mRecords) {mSignalStrength = signalStrength;for (Record r : mRecords) {if ((r.events & PhoneStateListener.LISTEN_SIGNAL_STRENGTHS) != 0) {try {r.callback.onSignalStrengthsChanged(new SignalStrength(signalStrength));} catch (RemoteException ex) {mRemoveList.add(r.binder);}}if ((r.events & PhoneStateListener.LISTEN_SIGNAL_STRENGTH) != 0) {try {int gsmSignalStrength = signalStrength.getGsmSignalStrength();r.callback.onSignalStrengthChanged((gsmSignalStrength == 99 ? -1: gsmSignalStrength));} catch (RemoteException ex) {mRemoveList.add(r.binder);}}}handleRemoveListLocked();}broadcastSignalStrengthChanged(signalStrength);}
然后转到
public void notifySignalStrength() {mNotifier.notifySignalStrength(this);}然后转到
public void notifySignalStrength(Phone sender) {try {if (isPrimaryPhone(sender)) {mRegistry.notifySignalStrength(sender.getSignalStrength());} else {mRegistry2.notifySignalStrength(sender.getSignalStrength());}} catch (RemoteException ex) {// system process is dead}}这个函数所在的class中有个
DefaultPhoneNotifier() {mRegistry = ITelephonyRegistry.Stub.asInterface(ServiceManager.getService("telephony.registry"));}
在TelephonyManager.java中提供了API，应用程序可以监听各种事件，实际上它将感兴趣的监听者作为一条记录添加到service一侧的列表（跨进程）中，当有变化时，调用它们提供的回调函数，通知（跨进程）这些注册者。
TelephonyManager.java中的listen函数如下：
public void listen(PhoneStateListener listener, int events) {if (isDefaultManager() == false) {if (sRegistry2 == null) {sRegistry2 = ITelephonyRegistry2.Stub.asInterface(ServiceManager.getService("telephony.registry2"));}}String pkgForDebug = mContext != null ? mContext.getPackageName() : "<unknown>";try {Boolean notifyNow = true;if (isDefaultManager()) {sRegistry.listen(pkgForDebug, listener.callback, events, notifyNow);} else {sRegistry2.listen(pkgForDebug, listener.callback, events, notifyNow);}} catch (RemoteException ex) {// system process dead} catch (NullPointerException ex) {// system process dead}}
下面的代码就是调用的listen函数，收到event之后的回调处理函数是mPhoneStateListener
public NetworkController(Context context) {mContext = context;final Resources res = context.getResources();ConnectivityManager cm = (ConnectivityManager)mContext.getSystemService(Context.CONNECTIVITY_SERVICE);mHasMobileDataFeature = cm.isNetworkSupported(ConnectivityManager.TYPE_MOBILE);mShowPhoneRSSIForData = res.getBoolean(R.bool.config_showPhoneRSSIForData);mShowAtLeastThreeGees = res.getBoolean(R.bool.config_showMin3G);mAlwaysShowCdmaRssi = res.getBoolean(com.android.internal.R.bool.config_alwaysUseCdmaRssi);// set up the default wifi icon, used when no radios have ever appearedupdateWifiIcons();updateWimaxIcons();// telephonymPhone = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);mPhone.listen(mPhoneStateListener,PhoneStateListener.LISTEN_SERVICE_STATE| PhoneStateListener.LISTEN_SIGNAL_STRENGTHS| PhoneStateListener.LISTEN_CALL_STATE| PhoneStateListener.LISTEN_DATA_CONNECTION_STATE| PhoneStateListener.LISTEN_DATA_ACTIVITY);下面就是回调函数的实现
<span style="font-size:18px;">PhoneStateListener mPhoneStateListener = new PhoneStateListener() {@Overridepublic void onSignalStrengthsChanged(SignalStrength signalStrength) {if (DEBUG) {Slog.d(TAG, "onSignalStrengthsChanged signalStrength=" + signalStrength +((signalStrength == null) ? "" : (" level=" + signalStrength.getLevel())));}mSignalStrength = signalStrength;updateTelephonySignalStrength();refreshViews();}</span>在updateSignalStrength函数中，将根据得到的信息，设置适当的图标id，显示合适的图标。
如果上层app想要获取信号强度信息
case EVENT_POLL_SIGNAL_STRENGTH:// Just poll signal strength...not part of pollState()if (mIsScreenOn) {mCi.getSignalStrength(obtainMessage(EVENT_GET_SIGNAL_STRENGTH));}break;
getSignalStrength (Message result) {RILRequest rr= RILRequest.obtain(RIL_REQUEST_SIGNAL_STRENGTH, result, mIs2ndRil);if (RILJ_LOGD) riljLog(rr.serialString() + "> " + requestToString(rr.mRequest));send(rr);}在ril.java中这边先创建了一个request然后用send函数发送给ril.c
<span style="font-size:18px;"> case RIL_UNSOL_SIGNAL_STRENGTH: ret = responseSignalStrength(p); break;</span><span style="font-size:18px;">private ObjectresponseSignalStrength(Parcel p) {// Assume this is gsm, but doesn't matter as ServiceStateTracker// sets the proper value.SignalStrength signalStrength = SignalStrength.makeSignalStrengthFromRilParcel(p);return signalStrength;}</span>这篇关于intel手机信号的强度变化追溯的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
