Android 5.1 close data flow 数据关闭流程

惯例流程图先

流程是入口是Settings->Data Usage 的开关，后面会看一下从下拉快速设置的入口进入。

android/packages/apps/Settings/src/com/android/settings/DataUsageSummary.java

关闭数据开关时，会弹出确认窗口

ConfirmDataDisableFragment.show(DataUsageSummary.this);

private View.OnClickListener mDataEnabledListener = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (mBinding) return;
 
            final boolean dataEnabled = !mDataEnabled.isChecked();
            final String currentTab = mCurrentTab;
            if (TAB_MOBILE.equals(currentTab) || currentTab.startsWith(TAB_SIM)) {
                if (dataEnabled) {
                    setMobileDataEnabled(true);
                    if (mPolicyEditor.getPolicyWarningBytes(mTemplate) == WARNING_DISABLED) {
                        mPolicyEditor.setPolicyWarningBytes(mTemplate, 2 * GB_IN_BYTES);
                    }
                } else {
                    // disabling data; show confirmation dialog which eventually
                    // calls setMobileDataEnabled() once user confirms.
                    ConfirmDataDisableFragment.show(DataUsageSummary.this);
                }
            }
 
            updatePolicy(false);
        }
    };

点击确认后即开始关闭数据的后续流程

target.setMobileDataEnabled(false);

    /**
     * Dialog to request user confirmation before disabling data.
     */
    public static class ConfirmDataDisableFragment extends DialogFragment {
        public static void show(DataUsageSummary parent) {
            if (!parent.isAdded()) return;
 
            final ConfirmDataDisableFragment dialog = new ConfirmDataDisableFragment();
            dialog.setTargetFragment(parent, 0);
            dialog.show(parent.getFragmentManager(), TAG_CONFIRM_DATA_DISABLE);
        }
 
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            final Context context = getActivity();
 
            final AlertDialog.Builder builder = new AlertDialog.Builder(context);
            builder.setMessage(R.string.data_usage_disable_mobile);
 
            builder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    final DataUsageSummary target = (DataUsageSummary) getTargetFragment();
                    if (target != null) {
                        // TODO: extend to modify policy enabled flag.
                        target.setMobileDataEnabled(false);
                    }
                }
            });
            builder.setNegativeButton(android.R.string.cancel, null);
 
            return builder.create();
        }
    }

获得当前TAB对应的SIM卡subId

mTelephonyManager.setDataEnabled(subId[0], enabled);

 
    private void setMobileDataEnabled(boolean enabled) {
        if (LOGD) Log.d(TAG, "setMobileDataEnabled()");
        // How about exposing sub based API like TelephonyManager.setDataEnabled(int subId);
        if (mCurrentTab.startsWith(TAB_SIM)) {
            int phoneId = multiSimGetCurrentSub();
 
            // as per phone, set the individual flag
            android.provider.Settings.Global.putInt(getActivity().getContentResolver(),
                    android.provider.Settings.Global.MOBILE_DATA + phoneId, enabled ? 1 : 0);
 
            int[] subId = SubscriptionManager.getSubId(phoneId);
            mTelephonyManager.setDataEnabled(subId[0], enabled);
        } else {
            mTelephonyManager.setDataEnabled(enabled);
            mMobileDataEnabled = enabled;
        }
        updatePolicy(false);
    }

android/frameworks/base/telephony/java/android/telephony/TelephonyManager.java

getITelephony().setDataEnabled(subId, enable);

    /** @hide */
    @SystemApi
    public void setDataEnabled(int subId, boolean enable) {
        try {
            AppOpsManager appOps = (AppOpsManager)mContext.getSystemService(Context.APP_OPS_SERVICE);
            if (enable) {
                if (appOps.noteOp(AppOpsManager.OP_DATA_CONNECT_CHANGE) != AppOpsManager.MODE_ALLOWED) {
                    Log.w(TAG, "Permission denied by user.");
                    return;
                }
            }
            Log.d(TAG, "setDataEnabled: enabled=" + enable);
            getITelephony().setDataEnabled(subId, enable);
        } catch (RemoteException e) {
            Log.e(TAG, "Error calling setDataEnabled", e);
        }
    }

android/packages/services/Telephony/src/com/android/phone/PhoneInterfaceManager.java

phone.setDataEnabled(enable);

 
    /**
     * Set mobile data enabled
     * Used by the user through settings etc to turn on/off mobile data
     *
     * @param enable {@code true} turn turn data on, else {@code false}
     */
    @Override
    public void setDataEnabled(int subId, boolean enable) {
        enforceModifyPermission();
        int phoneId = mSubscriptionController.getPhoneId(subId);
        log("getDataEnabled: subId=" + subId + " phoneId=" + phoneId);
        Phone phone = PhoneFactory.getPhone(phoneId);
        if (phone != null) {
            log("setDataEnabled: subId=" + subId + " enable=" + enable);
            phone.setDataEnabled(enable);
        } else {
            loge("setDataEnabled: no phone for subId=" + subId);
        }
    }

android/frameworks/opt/telephony/src/java/com/android/internal/telephony/gsm/GSMPhone.java

mDcTracker.setDataEnabled(enable);

    @Override
    public void setDataEnabled(boolean enable) {
        mDcTracker.setDataEnabled(enable);
    }

  android/frameworks/opt/telephony/src/java/com/android/internal/telephony/dataconnection/DcTrackerBase.java    

    /**
     * Modify {@link android.provider.Settings.Global#MOBILE_DATA} value.
     */
    public void setDataEnabled(boolean enable) {
        Message msg = obtainMessage(DctConstants.CMD_SET_USER_DATA_ENABLE);
        msg.arg1 = enable ? 1 : 0;
        sendMessage(msg);
    }

onSetUserDataEnabled(enabled);

    @Override
    public void handleMessage(Message msg) {
        switch (msg.what) {
            case AsyncChannel.CMD_CHANNEL_DISCONNECTED: {
                log("DISCONNECTED_CONNECTED: msg=" + msg);
                DcAsyncChannel dcac = (DcAsyncChannel) msg.obj;
                mDataConnectionAcHashMap.remove(dcac.getDataConnectionIdSync());
                dcac.disconnected();
                break;
            }
            ...
            case DctConstants.CMD_SET_USER_DATA_ENABLE: {
                final boolean enabled = (msg.arg1 == DctConstants.ENABLED) ? true : false;
                if (DBG) log("CMD_SET_USER_DATA_ENABLE enabled=" + enabled);
                onSetUserDataEnabled(enabled);
                break;
            }
...

onCleanUpAllConnections

    protected void onSetUserDataEnabled(boolean enabled) {
        synchronized (mDataEnabledLock) {
            if (mUserDataEnabled != enabled) {
                mUserDataEnabled = enabled;
                Settings.Global.putInt(mPhone.getContext().getContentResolver(),
                        Settings.Global.MOBILE_DATA + mPhone.getPhoneId(), enabled ? 1 : 0);
                if (getDataOnRoamingEnabled() == false &&
                        mPhone.getServiceState().getRoaming() == true) {
                    if (enabled) {
                        notifyOffApnsOfAvailability(Phone.REASON_ROAMING_ON);
                    } else {
                        notifyOffApnsOfAvailability(Phone.REASON_DATA_DISABLED);
                    }
                }
 
                if (enabled) {
                    onTrySetupData(Phone.REASON_DATA_ENABLED);
                } else {
                    onCleanUpAllConnections(Phone.REASON_DATA_SPECIFIC_DISABLED);//1
                }
            }
        }
    }

android/frameworks/opt/telephony/src/java/com/android/internal/telephony/dataconnection/DcTracker.java

这个类比较复杂，我们只看本次重点。

cleanUpAllConnections(true, cause);

    /**
     * Cleanup all connections.
     *
     * TODO: Cleanup only a specified connection passed as a parameter.
     *       Also, make sure when you clean up a conn, if it is last apply
     *       logic as though it is cleanupAllConnections
     *
     * @param cause for the clean up.
     */
 
    @Override
    protected void onCleanUpAllConnections(String cause) {
        cleanUpAllConnections(true, cause);
    } 

下面这里会循环多次。for(ApnContext apnContext : mApnContexts.values()) 

    /**
     * If tearDown is true, this only tears down a CONNECTED session. Presently,
     * there is no mechanism for abandoning an CONNECTING session,
     * but would likely involve cancelling pending async requests or
     * setting a flag or new state to ignore them when they came in
     * @param tearDown true if the underlying DataConnection should be
     * disconnected.
     * @param reason reason for the clean up.
     * @return boolean - true if we did cleanup any connections, false if they
     *                   were already all disconnected.
     */
    protected boolean cleanUpAllConnections(boolean tearDown, String reason) {
        if (DBG) log("cleanUpAllConnections: tearDown=" + tearDown + " reason=" + reason);
        boolean didDisconnect = false;
        boolean specificdisable = false;
 
        if (!TextUtils.isEmpty(reason)) {
            specificdisable = reason.equals(Phone.REASON_DATA_SPECIFIC_DISABLED);
        }
 
        for (ApnContext apnContext : mApnContexts.values()) {
            if (apnContext.isDisconnected() == false) didDisconnect = true;
            if (specificdisable) {
                if (!apnContext.getApnType().equals(PhoneConstants.APN_TYPE_IMS)) {
                    if (DBG) log("ApnConextType: " + apnContext.getApnType());
                    apnContext.setReason(reason);
                    cleanUpConnection(tearDown, apnContext);//2
                }
            } else {
                // TODO - only do cleanup if not disconnected
                apnContext.setReason(reason);
                cleanUpConnection(tearDown, apnContext);
            }
        }
 
        stopNetStatPoll();
        stopDataStallAlarm();
 
        // TODO: Do we need mRequestedApnType?
        mRequestedApnType = PhoneConstants.APN_TYPE_DEFAULT;
 
        log("cleanUpConnection: mDisconnectPendingCount = " + mDisconnectPendingCount);
        if (tearDown && mDisconnectPendingCount == 0) {
            notifyDataDisconnectComplete();
            notifyAllDataDisconnected();
        }
 
        return didDisconnect;
    }

每一次进来后if(apnContext.isDisconnected()) 的判断结果是不一样的，apnContext={mApnType=default mState=CONNECTED mApnType为其他时，其mState一般是IDLE的

protected void cleanUpConnection(boolean tearDown, ApnContext apnContext) {
 
        if (apnContext == null) {
            if (DBG) log("cleanUpConnection: apn context is null");
            return;
        }
 
        DcAsyncChannel dcac = apnContext.getDcAc();
        if (DBG) {
            log("cleanUpConnection: E tearDown=" + tearDown + " reason=" + apnContext.getReason() +
                    " apnContext=" + apnContext);
        }
        if (tearDown) {//3
            if (apnContext.isDisconnected()) {
                // The request is tearDown and but ApnContext is not connected.
                // If apnContext is not enabled anymore, break the linkage to the DCAC/DC.
                apnContext.setState(DctConstants.State.IDLE);
                if (!apnContext.isReady()) {
                    if (dcac != null) {
                        dcac.tearDown(apnContext, "", null);
                    }
                    apnContext.setDataConnectionAc(null);
                }
            } else {
                // Connection is still there. Try to clean up.
                if (dcac != null) {//4
                    if (apnContext.getState() != DctConstants.State.DISCONNECTING) {
                        boolean disconnectAll = false;
                        if (PhoneConstants.APN_TYPE_DUN.equals(apnContext.getApnType())) {
                            // CAF_MSIM is this below condition required.
                            // if (PhoneConstants.APN_TYPE_DUN.equals(PhoneConstants.APN_TYPE_DEFAULT)) {
                            if (teardownForDun()) {
                                if (DBG) log("tearing down dedicated DUN connection");
                                // we need to tear it down - we brought it up just for dun and
                                // other people are camped on it and now dun is done.  We need
                                // to stop using it and let the normal apn list get used to find
                                // connections for the remaining desired connections
                                disconnectAll = true;
                            }
                        }
                        if (DBG) {
                            log("cleanUpConnection: tearing down" + (disconnectAll ? " all" :""));
                        }
                        Message msg = obtainMessage(DctConstants.EVENT_DISCONNECT_DONE, apnContext);//4
                        if (disconnectAll) {
                            apnContext.getDcAc().tearDownAll(apnContext.getReason(), msg);
                        } else {
                            apnContext.getDcAc()
                                .tearDown(apnContext, apnContext.getReason(), msg);
                        }
                        apnContext.setState(DctConstants.State.DISCONNECTING);
                        mDisconnectPendingCount++;
                    }
                } else {
                    // apn is connected but no reference to dcac.
                    // Should not be happen, but reset the state in case.
                    apnContext.setState(DctConstants.State.IDLE);
                    mPhone.notifyDataConnection(apnContext.getReason(),
                                                apnContext.getApnType());
                }
            }
        } else {
            // force clean up the data connection.
            if (dcac != null) dcac.reqReset();
            apnContext.setState(DctConstants.State.IDLE);
            mPhone.notifyDataConnection(apnContext.getReason(), apnContext.getApnType());
            apnContext.setDataConnectionAc(null);
        }
 
        if (mOmhApt != null) {
            mOmhApt.clearActiveApnProfile();
        }
 
        // Make sure reconnection alarm is cleaned up if there is no ApnContext
        // associated to the connection.
        if (dcac != null) {
            cancelReconnectAlarm(apnContext);
        }
 
        setupDataForSinglePdnArbitration(apnContext.getReason());
 
        if (DBG) {
            log("cleanUpConnection: X tearDown=" + tearDown + " reason=" + apnContext.getReason() +
                    " apnContext=" + apnContext + " dcac=" + apnContext.getDcAc());
        }
    }

android/frameworks/opt/telephony/src/java/com/android/internal/telephony/dataconnection/DcAsyncChannel.java

sendMessage

/**
     * Tear down the connection through the apn on the network.
     *
     * @param onCompletedMsg is sent with its msg.obj as an AsyncResult object.
     *        With AsyncResult.userObj set to the original msg.obj.
     */
    public void tearDown(ApnContext apnContext, String reason, Message onCompletedMsg) {
        if (DBG) {
            log("tearDown: apnContext=" + apnContext
                    + " reason=" + reason + " onCompletedMsg=" + onCompletedMsg);
        }
        sendMessage(DataConnection.EVENT_DISCONNECT,//7
                        new DisconnectParams(apnContext, reason, onCompletedMsg));
    }

android/frameworks/opt/telephony/src/java/com/android/internal/telephony/dataconnection/DataConnection.java

这个也挺复杂的 维护了一个状态机 StateMachine

tearDownData(dp);

    /**
     * The state machine is connected, expecting an EVENT_DISCONNECT.
     */
    private class DcActiveState extends State {
       ...
 
        @Override
        public boolean processMessage(Message msg) {
       ...                
                case EVENT_DISCONNECT: {
                    DisconnectParams dp = (DisconnectParams) msg.obj;
                    if (DBG) {
                        log("DcActiveState: EVENT_DISCONNECT dp=" + dp
                                + " dc=" + DataConnection.this);
                    }
                    if (mApnContexts.contains(dp.mApnContext)) {
                        if (DBG) {
                            log("DcActiveState msg.what=EVENT_DISCONNECT RefCount="
                                    + mApnContexts.size());
                        }
 
                        if (mApnContexts.size() == 1) {
                            mApnContexts.clear();
                            mDisconnectParams = dp;
                            mConnectionParams = null;
                            dp.mTag = mTag;
                            tearDownData(dp);
                            transitionTo(mDisconnectingState);
                        } else {
                            mApnContexts.remove(dp.mApnContext);
                            notifyDisconnectCompleted(dp, false);
                        }
                    } else {
                        log("DcActiveState ERROR no such apnContext=" + dp.mApnContext
                                + " in this dc=" + DataConnection.this);
                        notifyDisconnectCompleted(dp, false);
                    }
                    retVal = HANDLED;
                    break;
                }

mPhone.mCi.deactivateDataCall

/**
     * TearDown the data connection when the deactivation is complete a Message with
     * msg.what == EVENT_DEACTIVATE_DONE and msg.obj == AsyncResult with AsyncResult.obj
     * containing the parameter o.
     *
     * @param o is the object returned in the AsyncResult.obj.
     */
    private void tearDownData(Object o) {
        int discReason = RILConstants.DEACTIVATE_REASON_NONE;
        if ((o != null) && (o instanceof DisconnectParams)) {
            DisconnectParams dp = (DisconnectParams)o;
 
            if (TextUtils.equals(dp.mReason, Phone.REASON_RADIO_TURNED_OFF)) {
                discReason = RILConstants.DEACTIVATE_REASON_RADIO_OFF;
            } else if (TextUtils.equals(dp.mReason, Phone.REASON_PDP_RESET)) {
                discReason = RILConstants.DEACTIVATE_REASON_PDP_RESET;
            }
        }
        if (mPhone.mCi.getRadioState().isOn()
                || (mPhone.getServiceState().getRilDataRadioTechnology()
                        == ServiceState.RIL_RADIO_TECHNOLOGY_IWLAN )) {
            if (DBG) log("tearDownData radio is on, call deactivateDataCall");
            mPhone.mCi.deactivateDataCall(mCid, discReason,
                    obtainMessage(EVENT_DEACTIVATE_DONE, mTag, 0, o));
        } else {
            if (DBG) log("tearDownData radio is off sendMessage EVENT_DEACTIVATE_DONE immediately");
            AsyncResult ar = new AsyncResult(o, null, null);
            sendMessage(obtainMessage(EVENT_DEACTIVATE_DONE, mTag, 0, ar));
        }
    }

调用到RIL.java中的方法

android/frameworks/opt/telephony/src/java/com/android/internal/telephony/RIL.java

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