android4.4 獲取符合默認短信應用要求的短信應用包名（改進篇）

從上一篇獲取符合默認短信應用來看，獲取思路是正確的，但是還很不完善，但是這歸根結底是google整出來的一套規范，如何去找到符合規范的應用呢，這得google告訴我們。

因此，我看了一下android源碼，關鍵是SmsApplication中的SmsApplicationData， 裡面有個函數叫getApplicationCollection(Context context)，這就是android4.4中系統用於獲取符合默認短信應用要求的應用信息的代碼，如下：

/**
     * Returns the list of available SMS apps defined as apps that are registered for both the
     * SMS_RECEIVED_ACTION (SMS) and WAP_PUSH_RECEIVED_ACTION (MMS) broadcasts (and their broadcast
     * receivers are enabled)
     *
     * Requirements to be an SMS application:
     * Implement SMS_DELIVER_ACTION broadcast receiver.
     * Require BROADCAST_SMS permission.
     *
     * Implement WAP_PUSH_DELIVER_ACTION broadcast receiver.
     * Require BROADCAST_WAP_PUSH permission.
     *
     * Implement RESPOND_VIA_MESSAGE intent.
     * Support smsto Uri scheme.
     * Require SEND_RESPOND_VIA_MESSAGE permission.
     *
     * Implement ACTION_SENDTO intent.
     * Support smsto Uri scheme.
     */
    public static Collection getApplicationCollection(Context context) {
        PackageManager packageManager = context.getPackageManager();

        // Get the list of apps registered for SMS
        Intent intent = new Intent(Intents.SMS_DELIVER_ACTION);
        List smsReceivers = packageManager.queryBroadcastReceivers(intent, 0);

        HashMap receivers = new HashMap();

        // Add one entry to the map for every sms receiver (ignoring duplicate sms receivers)
        for (ResolveInfo resolveInfo : smsReceivers) {
            final ActivityInfo activityInfo = resolveInfo.activityInfo;
            if (activityInfo == null) {
                continue;
            }
            if (!permission.BROADCAST_SMS.equals(activityInfo.permission)) {
                continue;
            }
            final String packageName = activityInfo.packageName;
            if (!receivers.containsKey(packageName)) {
                final String applicationName = resolveInfo.loadLabel(packageManager).toString();
                final SmsApplicationData smsApplicationData = new SmsApplicationData(
                        applicationName, packageName, activityInfo.applicationInfo.uid);
                smsApplicationData.mSmsReceiverClass = activityInfo.name;
                receivers.put(packageName, smsApplicationData);
            }
        }

        // Update any existing entries with mms receiver class
        intent = new Intent(Intents.WAP_PUSH_DELIVER_ACTION);
        intent.setDataAndType(null, "application/vnd.wap.mms-message");
        List mmsReceivers = packageManager.queryBroadcastReceivers(intent, 0);
        for (ResolveInfo resolveInfo : mmsReceivers) {
            final ActivityInfo activityInfo = resolveInfo.activityInfo;
            if (activityInfo == null) {
                continue;
            }
            if (!permission.BROADCAST_WAP_PUSH.equals(activityInfo.permission)) {
                continue;
            }
            final String packageName = activityInfo.packageName;
            final SmsApplicationData smsApplicationData = receivers.get(packageName);
            if (smsApplicationData != null) {
                smsApplicationData.mMmsReceiverClass = activityInfo.name;
            }
        }

        // Update any existing entries with respond via message intent class.
        intent = new Intent(TelephonyManager.ACTION_RESPOND_VIA_MESSAGE,
                Uri.fromParts("smsto", "", null));
        List respondServices = packageManager.queryIntentServices(intent, 0);
        for (ResolveInfo resolveInfo : respondServices) {
            final ServiceInfo serviceInfo = resolveInfo.serviceInfo;
            if (serviceInfo == null) {
                continue;
            }
            if (!permission.SEND_RESPOND_VIA_MESSAGE.equals(serviceInfo.permission)) {
                continue;
            }
            final String packageName = serviceInfo.packageName;
            final SmsApplicationData smsApplicationData = receivers.get(packageName);
            if (smsApplicationData != null) {
                smsApplicationData.mRespondViaMessageClass = serviceInfo.name;
            }
        }

        // Update any existing entries with supports send to.
        intent = new Intent(Intent.ACTION_SENDTO,
                Uri.fromParts("smsto", "", null));
        List sendToActivities = packageManager.queryIntentActivities(intent, 0);
        for (ResolveInfo resolveInfo : sendToActivities) {
            final ActivityInfo activityInfo = resolveInfo.activityInfo;
            if (activityInfo == null) {
                continue;
            }
            final String packageName = activityInfo.packageName;
            final SmsApplicationData smsApplicationData = receivers.get(packageName);
            if (smsApplicationData != null) {
                smsApplicationData.mSendToClass = activityInfo.name;
            }
        }

        // Remove any entries for which we did not find all required intents.
        for (ResolveInfo resolveInfo : smsReceivers) {
            final ActivityInfo activityInfo = resolveInfo.activityInfo;
            if (activityInfo == null) {
                continue;
            }
            final String packageName = activityInfo.packageName;
            final SmsApplicationData smsApplicationData = receivers.get(packageName);
            if (smsApplicationData != null) {
                if (!smsApplicationData.isComplete()) {
                    receivers.remove(packageName);
                }
            }
        }
        return receivers.values();
    }

    /**
     * Checks to see if we have a valid installed SMS application for the specified package name
     * @return Data for the specified package name or null if there isn't one
     */
    private static SmsApplicationData getApplicationForPackage(
            Collection applications, String packageName) {
        if (packageName == null) {
            return null;
        }
        // Is there an entry in the application list for the specified package?
        for (SmsApplicationData application : applications) {
            if (application.mPackageName.contentEquals(packageName)) {
                return application;
            }
        }
        return null;
    }

從源碼的實現來看，我上一篇關於這個功能的blog思路相當正確，只不過沒用讓它幾個條件同時滿足，因此，若我們需要獲取符合默認短信應用要求的短信應用包名的話，我們只要原原本本地把源碼搞出來用就行了

由於這個是隱藏的類和函數，我們獲取不到，用反射又會相當麻煩，直接把實現給拷出來不失為一個良策。

要判斷拿到的collection中的某一個是不是完全符合默認短信應用的要求怎麼辦呢？調用一下SmsApplication.isComplete()就OK了。