1 手动搜网应用程序
1.1 MobileNetworkSettings入口
我们首先从apk的Manifest找入口，如下：
/packages/apps/Settings/AndroidManifest.xml
紧接着的调用关系，会使用到布局xml文件：
/packages/apps/Settings/src/com/android/settings/network/telephony/MobileNetworkActivity.java
/packages/apps/Settings/src/com/android/settings/network/telephony/MobileNetworkSettings.java
@Override
protected int getPreferenceScreenResId() {
return R.xml.mobile_network_settings;
}
1.1.1 MobileNetworkSettings布局
从上述的R.xml.mobile_network_settings引入布局，这里摘抄部分：
/packages/apps/Settings/res/xml/mobile_network_settings.xml
1.1.2 MobileNetworkSettings字符串位置
通过字符串也可以快速查找一些难以确认的界面程序入口：
/packages/apps/Settings/res/values/strings.xml
1.1.3 MobileNetworkSettings初始化
在onAttach进行一些初步的初始化：
/packages/apps/Settings/src/com/android/settings/network/telephony/MobileNetworkSettings.java
@Override
public void onAttach(Context context) {
super.onAttach(context);
use(MobileNetworkSwitchController.class).init(getLifecycle(), mSubId);
use(DisabledSubscriptionController.class).init(getLifecycle(), mSubId);
use(MobileDataPreferenceController.class).init(getFragmentManager(), mSubId);
use(MobileDataPreferenceController.class).setWifiPickerTrackerHelper(
new WifiPickerTrackerHelper(getSettingsLifecycle(), context,
null /* WifiPickerTrackerCallback */));
use(RoamingPreferenceController.class).init(getFragmentManager(), mSubId);
use(ApnPreferenceController.class).init(mSubId);
use(PreferredNetworkModePreferenceController.class).init(mSubId);
use(CarrierWifiTogglePreferenceController.class).init(getLifecycle(), mSubId);
final WifiCallingPreferenceController wifiCallingPreferenceController =
use(WifiCallingPreferenceController.class).init(mSubId);
final OpenNetworkSelectPagePreferenceController openNetworkSelectPagePreferenceController =
use(OpenNetworkSelectPagePreferenceController.class).init(getLifecycle(), mSubId);
final AutoSelectPreferenceController autoSelectPreferenceController =
use(AutoSelectPreferenceController.class)
.init(getLifecycle(), mSubId)
.addListener(openNetworkSelectPagePreferenceController);
use(NetworkPreferenceCategoryController.class).init(getLifecycle(), mSubId)
.setChildren(Arrays.asList(autoSelectPreferenceController));
use(NetworkPreferenceCategoryController.class).init(getLifecycle(), mSubId)
.setChildren(Arrays.asList(autoSelectPreferenceController));
use(Enhanced4gCallingPreferenceController.class).init(mSubId)
.addListener(videoCallingPreferenceController);
1.2 手动搜网代码入口
从上述分析可以得知，手动搜网的代码入口java文件如下：
/packages/apps/Settings/src/com/android/settings/network/telephony/gsm/AutoSelectPreferenceController.java
1.3 手动搜网应用流程
如果用户选择了手动搜网，则走else流程：
/packages/apps/Settings/src/com/android/settings/network/telephony/gsm/AutoSelectPreferenceController.java
@Override
public boolean setChecked(boolean isChecked) {
if (isChecked) {
setAutomaticSelectionMode();
return false;
} else {
final Bundle bundle = new Bundle();
bundle.putInt(Settings.EXTRA_SUB_ID, mSubId);
new SubSettingLauncher(mContext)
.setDestination(NetworkSelectSettings.class.getName())
.setSourceMetricsCategory(SettingsEnums.MOBILE_NETWORK_SELECT)
.setTitleRes(R.string.choose_network_title)
.setArguments(bundle)
.launch();
return false;
}
}
如下界面被发起，startNetworkQuery()被调用。mUseNewApi来自config_enableNewAutoSelectNetworkUI，该值为false，所以选择了NETWORK_SCAN_TYPE_WAIT_FOR_ALL_RESULTS：
/packages/apps/Settings/src/com/android/settings/network/telephony/NetworkSelectSettings.java
@Override
public void onStart() {
super.onStart();
updateForbiddenPlmns();
if (isProgressBarVisible()) {
return;
}
if (mWaitingForNumberOfScanResults <= 0) {
startNetworkQuery();
}
}
private void startNetworkQuery() {
setProgressBarVisible(true);
if (mNetworkScanHelper != null) {
mRequestIdManualNetworkScan = getNewRequestId();
mWaitingForNumberOfScanResults = MIN_NUMBER_OF_SCAN_REQUIRED;
mNetworkScanHelper.startNetworkScan(
mUseNewApi
? NetworkScanHelper.NETWORK_SCAN_TYPE_INCREMENTAL_RESULTS
: NetworkScanHelper.NETWORK_SCAN_TYPE_WAIT_FOR_ALL_RESULTS);
}
}
接下来通过startNetworkScan()来启动手动搜网，走该代码的if分支，逐步完成对TelephonyManager API的调用。这里也需要注意，对于网络侧返回信息，则callback函数onSuccess()或onFailure()会被调用：
/packages/apps/Settings/src/com/android/settings/network/telephony/NetworkScanHelper.java
/**
* Performs a network scan for the given type {@code type}.
* {@link #NETWORK_SCAN_TYPE_INCREMENTAL_RESULTS} is recommended if modem supports
* {@link TelephonyManager#requestNetworkScan(
* NetworkScanRequest, Executor, TelephonyScanManager.NetworkScanCallback)}.
*
* @param type used to tell which network scan API should be used.
*/
public void startNetworkScan(@NetworkQueryType int type) {
if (type == NETWORK_SCAN_TYPE_WAIT_FOR_ALL_RESULTS) {
mNetworkScanFuture = SettableFuture.create();
Futures.addCallback(mNetworkScanFuture, new FutureCallback>() {
@Override
public void onSuccess(List result) {
onResults(result);
onComplete();
}
@Override
public void onFailure(Throwable t) {
if (t instanceof CancellationException) {
return;
}
int errCode = Integer.parseInt(t.getMessage());
onError(errCode);
}
}, MoreExecutors.directExecutor());
mExecutor.execute(new NetworkScanSyncTask(
mTelephonyManager, (SettableFuture) mNetworkScanFuture));
} else if (type == NETWORK_SCAN_TYPE_INCREMENTAL_RESULTS) {
if (mNetworkScanRequester != null) {
return;
}
mNetworkScanRequester = mTelephonyManager.requestNetworkScan(
createNetworkScanForPreferredAccessNetworks(),
mExecutor,
mInternalNetworkScanCallback);
if (mNetworkScanRequester == null) {
onError(NetworkScan.ERROR_RADIO_INTERFACE_ERROR);
}
}
}
private static final class NetworkScanSyncTask implements Runnable {
private final SettableFuture> mCallback;
private final TelephonyManager mTelephonyManager;
NetworkScanSyncTask(
TelephonyManager telephonyManager, SettableFuture> callback) {
mTelephonyManager = telephonyManager;
mCallback = callback;
}
@Override
public void run() {
final CellNetworkScanResult result = mTelephonyManager.getAvailableNetworks();
if (result.getStatus() == CellNetworkScanResult.STATUS_SUCCESS) {
final List cellInfos = result.getOperators()
.stream()
.map(operatorInfo
-> CellInfoUtil.convertOperatorInfoToCellInfo(operatorInfo))
.collect(Collectors.toList());
Log.d(TAG, "Sync network scan completed, cellInfos = "
+ CellInfoUtil.cellInfoListToString(cellInfos));
mCallback.set(cellInfos);
} else {
final Throwable error = new Throwable(
Integer.toString(convertToScanErrorCode(result.getStatus())));
mCallback.setException(error);
Log.d(TAG, "Sync network scan error, ex = " + error);
}
}
}
2 手动搜网Framework
2.1 Framework涉及到的类
四个主要的类：
TelephonyManager : 提供API给应用。
PhoneInterfaceManager : 实现ITelephony接口，实现对Phone的控制操作。其内部类MainThreadHandler继承于Handler。
GsmCdmaPhone : Phone，其父类继承于Handler。
RIL : RILJ，提供API给Phone
2.2 流程图
这些类的工作流程一般如下：
Step1: 通过TelephonyManager API调用Telephony Service(PhoneInterfaceManager)
Step2: 通过Telephony Service调用控制Phone
Step3: 通过Phone调用RILJ
Step4: RILJ通过HIDL实现对RILD的调用
Step5: RILD通过RadioResponse把返回值反馈给Phone
Step6: Phone把返回值传给Telephony Service
Step7: Telephony Service把返回值通知给应用程序
3 手动搜网RILD
3.1 流程图
3.2 AT Command
可参考3GPP TS 27.007之7.3 PLMN selection +COPS
如下是联通卡搜网的一个结果示例：
AT> AT+COPS=?
AT< +COPS: (1,"China Unicom","CU-GSM","46001","25C7",7),(1,"China Unicom","CU-GSM","46001","A5AB",2),(2,"China Unicom","CU-GSM","46001","77B600",11),(3,"46011","46011","46011","7C06",7),(3,"China Mobile","CMCC","46000","2441",7),(3,"46011","46011","46011","77B600",11),,(0-3),(0-2)
AT< OK
界面效果如下：
China Unicom 4G (Available)
China Unicom 3G (Available)
China Unicom 5G (Current)
China Telecom 4G (Forbidden)
China Mobile 4G (Forbidden)
China Telecom 5G (Forbidden)
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本文链接：https://www.jianshu.com/p/e56e83ca520d