前言
最近有需求需要实现插卡默认打开Volte功能，顺带研究了下Volte的流程，在此做个记录
开始
从Settings设置界面入手，网络和互联网-->移动网络-->VoLTE高清通话(电信卡)/增强型4G LTE模式（移动卡）
找到网络和互联网加载对应的Fragment为NetworkDashboardFragment，
源码位置 vendor\mediatek\proprietary\packages\apps\MtkSettings\src\com\android\settings\network\NetworkDashboardFragment.java，
NetworkDashboardFragment加载的布局xml为 network_and_internet.xml
源码位置 vendor\mediatek\proprietary\packages\apps\MtkSettings\res\xml\network_and_internet.xml
<PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:settings="http://schemas.android.com/apk/res/com.android.settings"
android:title="@string/network_dashboard_title">
...
<com.android.settingslib.RestrictedPreference
android:key="mobile_network_settings"
android:title="@string/network_settings_title"
android:summary="@string/summary_placeholder"
android:icon="@drawable/ic_network_cell"
android:dependency="toggle_airplane"
android:order="-15"
settings:keywords="@string/keywords_more_mobile_networks"
settings:userRestriction="no_config_mobile_networks"
settings:useAdminDisabledSummary="true">
<intent
android:action="android.intent.action.MAIN"
android:targetPackage="com.android.phone"
android:targetClass="com.android.phone.MobileNetworkSettings"/>
</com.android.settingslib.RestrictedPreference>从上面可以看出移动网络对应的目标启动类为MobileNetworkSettings
源码位置 vendor\mediatek\proprietary\packages\services\Telephony\src\com\android\phone\MobileNetworkSettings.java
代码不算多，2400多行，别被吓到了，只需找我们关心的即可
private void addEnhanced4GLteSwitchPreference(PreferenceScreen preferenceScreen) {
int phoneId = SubscriptionManager.getPhoneId(mPhone.getSubId());
log("[addEnhanced4GLteSwitchPreference] volteEnabled :"
+ isVolteEnabled());
if (mButton4glte != null) {
log("[addEnhanced4GLteSwitchPreference] Remove mButton4glte!");
//移除Google原生的volte开关
preferenceScreen.removePreference(mButton4glte);
}
//是否包含CT插件
boolean isCtPlugin = ExtensionManager.getMobileNetworkSettingsExt().isCtPlugin();
log("[addEnhanced4GLteSwitchPreference] ss :" + isCtPlugin);
if (isVolteEnabled() && !isCtPlugin) {
int order = mButtonEnabledNetworks.getOrder() + 1;
//实例化volte开关
mEnhancedButton4glte = new Enhanced4GLteSwitchPreference(this, mPhone.getSubId());
/// Still use Google's key, title, and summary. 将原来的key依旧设置给新的volte开关，用于处理点击事件
mEnhancedButton4glte.setKey(BUTTON_4G_LTE_KEY);
/// M: [CT VOLTE]
// show "VOLTE" for CT VOLTE SIM
if (TelephonyUtilsEx.isCtVolteEnabled()
&& TelephonyUtilsEx.isCtSim(mPhone.getSubId())) {
mEnhancedButton4glte.setTitle(R.string.hd_voice_switch_title);//VoLTE高清通话
mEnhancedButton4glte.setSummary(R.string.hd_voice_switch_summary);//启用前应先向运营商确认已开通此功能，否则可能影响正常通话
} else {
PersistableBundle carrierConfig =
PhoneGlobals.getInstance().getCarrierConfigForSubId(mPhone.getSubId());
boolean useVariant4glteTitle = carrierConfig.getBoolean(
CarrierConfigManager.KEY_ENHANCED_4G_LTE_TITLE_VARIANT_BOOL);
int enhanced4glteModeTitleId = useVariant4glteTitle ?
R.string.enhanced_4g_lte_mode_title_variant :
R.string.enhanced_4g_lte_mode_title;//增强型 4G LTE 模式
mEnhancedButton4glte.setTitle(enhanced4glteModeTitleId);
}
/// M: [CT VOLTE]
// show "VOLTE" for CT VOLTE SIM
if (!TelephonyUtilsEx.isCtVolteEnabled()
|| !TelephonyUtilsEx.isCtSim(mPhone.getSubId())) {
/// @}
mEnhancedButton4glte.setSummary(R.string.enhanced_4g_lte_mode_summary);//使用 LTE 服务改进语音和其他通信功能（推荐）
}
mEnhancedButton4glte.setOnPreferenceChangeListener(this);
mEnhancedButton4glte.setOrder(order);
/// M: Customize the LTE switch preference. @{
ExtensionManager.getMobileNetworkSettingsExt()
.customizeEnhanced4GLteSwitchPreference(this, mEnhancedButton4glte);
/// @}
} else {
mEnhancedButton4glte = null;
}
}开关的UI分析完了，我们接着看下volte开关的点击事件
public boolean onPreferenceChange(Preference preference, Object objValue) {
final int phoneSubId = mPhone.getSubId();
if (onPreferenceChangeMTK(preference, objValue)) {//新实例化的volte开关处理点击事件
return true;
}
if (preference == mButtonPreferredNetworkMode) {
....
} else if (preference == mButton4glte) {//Google原生的volte点击事件
SwitchPreference enhanced4gModePref = (SwitchPreference) preference;
boolean enhanced4gMode = !enhanced4gModePref.isChecked();
enhanced4gModePref.setChecked(enhanced4gMode);
Log.e("NetworkSettings", "enhanced4gMode="+enhanced4gMode + " phoneId="+mPhone.getPhoneId());
MtkImsManager.setEnhanced4gLteModeSetting(this, enhanced4gModePref.isChecked(),
mPhone.getPhoneId());
}新实例化的volte开关处理点击事件
private boolean onPreferenceChangeMTK(Preference preference, Object objValue) {
String volteTitle = getResources().getString(R.string.hd_voice_switch_title);
String lteTitle = getResources().getString(R.string.enhanced_4g_lte_mode_title);
log("[onPreferenceChangeMTK] Preference = " + preference.getTitle());
if ((mEnhancedButton4glte == preference) || preference.getTitle().equals(volteTitle)
|| preference.getTitle().equals(lteTitle)) {
Enhanced4GLteSwitchPreference ltePref = (Enhanced4GLteSwitchPreference) preference;
log("[onPreferenceChangeMTK] IsChecked = " + ltePref.isChecked());
/// M: [CT VOLTE] @{
if (TelephonyUtilsEx.isCtVolteEnabled() && TelephonyUtilsEx.isCtSim(
mPhone.getSubId())
&& !ltePref.isChecked()) {
int type = TelephonyManager.getDefault().getNetworkType(mPhone.getSubId());
log("network type = " + type);
if (TelephonyManager.NETWORK_TYPE_LTE != type
&& !TelephonyUtilsEx.isRoaming(mPhone)
&& (TelephonyUtilsEx.getMainPhoneId() == mPhone.getPhoneId()
|| TelephonyUtilsEx.isBothslotCt4gSim(mSubscriptionManager))) {
if (!TelephonyUtilsEx.isCtAutoVolteEnabled()) {
showVolteUnavailableDialog();
return false;
}
}
}
ltePref.setChecked(!ltePref.isChecked());
Log.e("NetworkSettings", "ltePref.isChecked()="+ltePref.isChecked() + " phoneId="+mPhone.getPhoneId());
MtkImsManager.setEnhanced4gLteModeSetting(this, ltePref.isChecked(),
mPhone.getPhoneId());
return true;
}
return false;
}这个函数处理如果点击的是新实例化的vlote开关，或者volte整个条目，其它返回false，由原来的onPreferenceChange接着处理事件。
可以看到，最终通过MtkImsManager.setEnhanced4gLteModeSetting(this, ltePref.isChecked(), mPhone.getPhoneId()); 来控制Volte的打开和关闭。
继续跟进 源码位置 vendor\mediatek\proprietary\frameworks\opt\net\ims\src\java\com\mediatek\ims\internal\MtkImsManager.java
public static void setEnhanced4gLteModeSetting(Context context, boolean enabled, int phoneId) {
int value = enabled ? 1 : 0;
if (isSupportMims() == false) {
phoneId = getMainPhoneIdForSingleIms(context);
android.provider.Settings.Global.putInt(
context.getContentResolver(),
android.provider.Settings.Global.ENHANCED_4G_MODE_ENABLED, value);
if (isNonTtyOrTtyOnVolteEnabled(context, phoneId)) {
ImsManager imsManager = ImsManager.getInstance(context, phoneId);
if (imsManager != null) {
try {
imsManager.setAdvanced4GMode(enabled);
} catch (ImsException ie) {
// do nothing
}
}
}
} else {
sImsManagerExt = getImsManagerPluginInstance(context);
if (sImsManagerExt != null) {
phoneId = sImsManagerExt.getImsPhoneId(context, phoneId);
}
ImsManager imsManager = ImsManager.getInstance(context, phoneId);
if(imsManager != null) {
imsManager.setEnhanced4gLteModeSettingForSlot(enabled);
} else {
loge("setEnhanced4gLteModeSetting");
loge("getInstance null for phoneId=" + phoneId);
}
}
}这里需要关注下isSupportMims()的返回结果
//private static final String MULTI_IMS_SUPPORT = "persist.mtk_mims_support";
public static boolean isSupportMims() {
return (SystemProperties.getInt(MULTI_IMS_SUPPORT, 1) > 1);
}SystemProperties读取的是build.prop中的值，经查找persist.mtk_mims_support不存在，则为默认值1, isSupportMims()结果为false，
那么回到上面的逻辑中，走if代码块，将volte的状态保存到Settings.Global.ENHANCED_4G_MODE_ENABLED中，
方便当下次进入界面时查询结果以显示开关的状态。继续看isNonTtyOrTtyOnVolteEnabled()结果
public static boolean isNonTtyOrTtyOnVolteEnabled(Context context, int phoneId) {
if (isSupportMims() == false) {
if (ImsManager.getBooleanCarrierConfig(context,
CarrierConfigManager.KEY_CARRIER_VOLTE_TTY_SUPPORTED_BOOL)) {
return true;
}
return Settings.Secure.getInt(context.getContentResolver(),
Settings.Secure.PREFERRED_TTY_MODE, TelecomManager.TTY_MODE_OFF)
== TelecomManager.TTY_MODE_OFF;
}
ImsManager imsManager = ImsManager.getInstance(context, phoneId);
if(imsManager != null) {
return imsManager.isNonTtyOrTtyOnVolteEnabledForSlot();
} else {
loge("isNonTtyOrTtyOnVolteEnabled");
loge("getInstance null for phoneId=" + phoneId);
}
return false;
}从刚刚结论isSupportMims()为false，主要看ImsManager.getBooleanCarrierConfig()结果
源码位置 frameworks\opt\net\ims\src\java\com\android\ims\ImsManager.java
public static boolean getBooleanCarrierConfig(Context context, String key) {
CarrierConfigManager configManager = (CarrierConfigManager) context.getSystemService(
Context.CARRIER_CONFIG_SERVICE);
PersistableBundle b = null;
if (configManager != null) {
b = configManager.getConfig();
}
if (b != null) {
return b.getBoolean(key);
} else {
// Return static default defined in CarrierConfigManager.
return CarrierConfigManager.getDefaultConfig().getBoolean(key);
}
}从上面的代码可以看出，不论CarrierConfigManager是否为null，最终都是通过getBoolean（）来读取key对应的结果，有点类似SharedPrenference
还得继续往下深入，
CarrierConfigManager 源码位置 frameworks\base\telephony\java\android\telephony\CarrierConfigManager.java
static {
sDefaults = new PersistableBundle();
...
sDefaults.putBoolean(KEY_CARRIER_VOLTE_PROVISIONING_REQUIRED_BOOL, false);
sDefaults.putBoolean(KEY_CARRIER_VOLTE_OVERRIDE_WFC_PROVISIONING_BOOL, false);
sDefaults.putBoolean(KEY_CARRIER_VOLTE_TTY_SUPPORTED_BOOL, true);
}从中我们找到静态代码块设置初始值 KEY_CARRIER_VOLTE_TTY_SUPPORTED_BOOL，默认值为true，回到 MtkImsManager.java 中，
isNonTtyOrTtyOnVolteEnabled()结果为true，则调用imsManager.setAdvanced4GMode(enabled)来打开或关闭volte。
进入ImsManager中，源码位置 frameworks\opt\net\ims\src\java\com\android\ims\ImsManager.java
public void setAdvanced4GMode(boolean turnOn) throws ImsException {
checkAndThrowExceptionIfServiceUnavailable();//bind IMS_SERVICE，如果IMS服务不可用则抛出异常
// if turnOn: first set feature values then call turnOnIms()
// if turnOff: only set feature values if IMS turn off is not allowed. If turn off is
// allowed, first call turnOffIms() then set feature values
if (turnOn) {
setLteFeatureValues(turnOn);
log("setAdvanced4GMode: turnOnIms");
turnOnIms();//打开IMS 服务
} else {
if (isImsTurnOffAllowed()) {
log("setAdvanced4GMode: turnOffIms");
turnOffIms();//关闭IMS 服务
}
setLteFeatureValues(turnOn);
}
}打开IMS服务
public void turnOnIms() throws ImsException {
checkAndThrowExceptionIfServiceUnavailable();
try {
mImsServiceProxy.turnOnIms();
} catch (RemoteException e) {
throw new ImsException("turnOnIms() ", e, ImsReasonInfo.CODE_LOCAL_IMS_SERVICE_DOWN);
}
}通过mImsServiceProxy代理对象调用，代理对象的创建过程在createImsService()中
/**
* Binds the IMS service to make/receive the call. Supports two methods of exposing an
* ImsService:
* 1) com.android.ims.ImsService implementation in ServiceManager (deprecated).
* 2) android.telephony.ims.ImsService implementation through ImsResolver.
*/
protected void createImsService() {
if (!mConfigDynamicBind) {
// Old method of binding
Rlog.i(TAG, "Creating ImsService using ServiceManager");
mImsServiceProxy = getServiceProxyCompat();
} else {
Rlog.i(TAG, "Creating ImsService using ImsResolver");
mImsServiceProxy = getServiceProxy();
}
// We have created a new ImsService connection, signal for re-registration
synchronized (mHasRegisteredLock) {
mHasRegisteredForProxy = false;
}
}此处创建mImsServiceProxy代理对象有两种方式，mConfigDynamicBind的值在framework/core/res/res/values/config.xml中定义，
通过查看该值为false，则通过getServiceProxyCompat()获取mImsServiceProxy对象。
private ImsServiceProxyCompat getServiceProxyCompat() {
IBinder binder = ServiceManager.checkService(IMS_SERVICE);
if (binder != null) {
try {
binder.linkToDeath(mDeathRecipient, 0);
} catch (RemoteException e) {
}
}
return new ImsServiceProxyCompat(mPhoneId, binder);
}ImsServiceProxyCompat的turnOnIms()方法
@Override
public void turnOnIms() throws RemoteException {
checkBinderConnection();
getServiceInterface(mBinder).turnOnIms(mSlotId);
}实际上通过mBinder获取到IImsService对象，继续跟进，实际上最终调用了IImsService.aidl的turnOnIms()
源码位置 frameworks\base\telephony\java\com\android\ims\internal\IImsService.aidl
interface IImsService {
....
/**
* Config interface to get/set IMS service/capability parameters.
*/
IImsConfig getConfigInterface(int phoneId);
/**
* Used for turning on IMS when its in OFF state.
*/
void turnOnIms(int phoneId);
/**
* Used for turning off IMS when its in ON state.
* When IMS is OFF, device will behave as CSFB'ed.
*/
void turnOffIms(int phoneId);
....
}回到上面在ImsManager.java中setAdvanced4GMode()方法，不管打开或关闭都会调用setLteFeatureValues(turnOn),来看下做了什么操作
protected void setLteFeatureValues(boolean turnOn) {
log("setLteFeatureValues: " + turnOn);
try {
ImsConfig config = getConfigInterface();
if (config != null) {
config.setFeatureValue(ImsConfig.FeatureConstants.FEATURE_TYPE_VOICE_OVER_LTE,
TelephonyManager.NETWORK_TYPE_LTE, turnOn ? 1 : 0, mImsConfigListener);
if (isVolteEnabledByPlatformForSlot()) {
boolean ignoreDataEnabledChanged = getBooleanCarrierConfig(mContext,
CarrierConfigManager.KEY_IGNORE_DATA_ENABLED_CHANGED_FOR_VIDEO_CALLS);
boolean enableViLte = turnOn && isVtEnabledByUserForSlot() &&
(ignoreDataEnabledChanged || isDataEnabled());
config.setFeatureValue(ImsConfig.FeatureConstants.FEATURE_TYPE_VIDEO_OVER_LTE,
TelephonyManager.NETWORK_TYPE_LTE,
enableViLte ? 1 : 0,
mImsConfigListener);
}
}
} catch (ImsException e) {
loge("setLteFeatureValues: exception ", e);
}
}调用ImsConfig的setFeatureValue()保存值
源码位置 frameworks\base\telephony\java\com\android\ims\ImsConfig.java
public void setFeatureValue(int feature, int network, int value,
ImsConfigListener listener) throws ImsException {
if (DBG) {
Rlog.d(TAG, "setFeatureValue: feature = " + feature + ", network =" + network +
", value =" + value + ", listener =" + listener);
}
try {
miConfig.setFeatureValue(feature, network, value, listener);
} catch (RemoteException e) {
throw new ImsException("setFeatureValue()", e,
ImsReasonInfo.CODE_LOCAL_SERVICE_UNAVAILABLE);
}
}发现又调用的miConfig，继续接着找吧。调用过程：
ImsConfig.Java中setFeatureValue()--->IImsConfig.aild--->
--->ImsConfigImplBase.java(继承IImsConfig.aild)-->ImsConfigImpl中的setFeatureValue(继承ImsConfigImplBase)-->ImsConfigStorage中的setFeatureValue
vendor\mediatek\proprietary\packages\services\Ims\src\com\mediatek\ims\config\internal\ImsConfigStorage.java
public void setFeatureValue(int featureId, int network, int value)
throws ImsException {
synchronized(mFeatureLock) {
mFeatureHelper.updateFeature(featureId, network, value);
}
}
//当前类中的内部类 FeatureHelper
private static class FeatureHelper {
private void updateFeature(int featureId, int network, int value) {
int curValue = -1;
boolean result = false;
ContentValues cv = new ContentValues();
cv.put(ImsConfigContract.Feature.PHONE_ID, mPhoneId);
cv.put(ImsConfigContract.Feature.FEATURE_ID, featureId);
cv.put(ImsConfigContract.Feature.NETWORK_ID, network);
cv.put(ImsConfigContract.Feature.VALUE, value);
// Check exist or not
try {
curValue = getFeatureValue(featureId, network);
if (DEBUG) Log.d(TAG, "updateFeature() comparing: curValue: " +
curValue + ", value:" + value);
if (!checkIfBroadcastOnce(featureId, mPhoneId) || curValue != value || curValue == -1) {
mContentResolver.update(
ImsConfigContract.Feature.getUriWithFeatureId(mPhoneId, featureId, network),
cv, null, null);
}
} catch (ImsException e) {
Log.e(TAG, "updateFeature() ImsException featureId:" + featureId +", value:" + value);
mContentResolver.insert(ImsConfigContract.Feature.CONTENT_URI, cv);
}
}
}