Android4.2Email源码流程解析

Email代码结构

源码地址http://download.csdn.net/detail/wds1181977/5623927

入口处为com.android.email.activity.Welcome

初始化操作，判断是否有账户信息，如果没有账户信息跳转入登录界面AccountSetupBasics，如果已登录则去主界面EmailActivity

  private void resolveAccount() {
        final int numAccount = EmailContent.count(this, Account.CONTENT_URI);
        if (numAccount == 0) {
            AccountSetupBasics.actionNewAccount(this);
            finish();
            return;
        } else {
            mAccountId = resolveAccountId(this, mAccountId, mAccountUuid);
            if (Account.isNormalAccount(mAccountId) &&
                    Mailbox.findMailboxOfType(this, mAccountId, Mailbox.TYPE_INBOX)
                            == Mailbox.NO_MAILBOX) {
                startInboxLookup();
                return;
            }
        }
        startEmailActivity();
    }

com.android.email.activity.setup.AccountSetupBasics登录账户界面

邮箱账户类型分为POP3 IMAP.Exchange这几种类型，登录邮箱需要配置接受设置和外发设置，下面是源码中的各个国家邮箱的接受设置和外发设置，当你点击下一步后会解析R.xml.providers.xml,如果你输入的账户能匹配到，就不需要手动配置邮箱，自动会导入配置（当你想新增邮箱你可以把配置加到这里就可以了）

当你输了了账户密码点击下一步，

代码根据你输入类型查找xml匹配

    /**
     * When "next" button is clicked
     */
    private void onNext() {
        // Try auto-configuration from XML providers (unless in EAS mode, we can skip it)
        if (SetupData.getFlowMode() != SetupData.FLOW_MODE_ACCOUNT_MANAGER_EAS) {
            String email = mEmailView.getText().toString().trim();
            String[] emailParts = email.split("@");
            String domain = emailParts[1].trim();
            mProvider = AccountSettingsUtils.findProviderForDomain(this, domain);
            if (mProvider != null) {
                if (mProvider.note != null) {
                    NoteDialogFragment dialogFragment =
                            NoteDialogFragment.newInstance(mProvider.note);
                    dialogFragment.show(getFragmentManager(), NoteDialogFragment.TAG);
                } else {
                    finishAutoSetup();
                }
                return;
            }
        }
        // Can't use auto setup (although EAS accounts may still be able to AutoDiscover)
        onManualSetup(true);
    }

com.android.email.activity.setup.AccountSettingsUtils中解析过程

   /*package*/ static Provider findProviderForDomain(
            Context context, String domain, int resourceId) {
        try {
            XmlResourceParser xml = context.getResources().getXml(resourceId);
            int xmlEventType;
            Provider provider = null;
            while ((xmlEventType = xml.next()) != XmlResourceParser.END_DOCUMENT) {
                if (xmlEventType == XmlResourceParser.START_TAG
                        && "provider".equals(xml.getName())) {
                    String providerDomain = getXmlAttribute(context, xml, "domain");
                    try {
                        if (matchProvider(domain, providerDomain)) {
                            provider = new Provider();
                            provider.id = getXmlAttribute(context, xml, "id");
                            provider.label = getXmlAttribute(context, xml, "label");
                            provider.domain = domain.toLowerCase();
                            provider.note = getXmlAttribute(context, xml, "note");
                        }
                    } catch (IllegalArgumentException e) {
                        Log.w(Logging.LOG_TAG, "providers line: " + xml.getLineNumber() +
                                "; Domain contains multiple globals");
                    }
                }
                else if (xmlEventType == XmlResourceParser.START_TAG
                        && "incoming".equals(xml.getName())
                        && provider != null) {
                    provider.incomingUriTemplate = getXmlAttribute(context, xml, "uri");
                    provider.incomingUsernameTemplate = getXmlAttribute(context, xml, "username");
                }
                else if (xmlEventType == XmlResourceParser.START_TAG
                        && "outgoing".equals(xml.getName())
                        && provider != null) {
                    provider.outgoingUriTemplate = getXmlAttribute(context, xml, "uri");
                    provider.outgoingUsernameTemplate = getXmlAttribute(context, xml, "username");
                }
                else if (xmlEventType == XmlResourceParser.END_TAG
                        && "provider".equals(xml.getName())
                        && provider != null) {
                    return provider;
                }
            }
        }
        catch (Exception e) {
            Log.e(Logging.LOG_TAG, "Error while trying to load provider settings.", e);
        }
        return null;
    }