[Corona SDK] 如何支援多個廣告系統 - AdMob, iAds, Vungle

在如何加入廣告 - AdMob V2裡，
我們知道要如何加入AdMob Ads，
要加入iAds和Vungle的話，作法很類似，
在這裡我們討論如果要同時支援的話該如何處理，
也就是說，我們可以動態選擇 AdMob, iAds, Vungle,
不管是因為Fill Rate, eCPM或者其它原因...

Add plugin
首先，我們需要在build.settings加入plug-in:

settings =
{
 plugins =
    {
       ["plugin.google.play.services"] =
        {
            publisherId = "com.coronalabs"
        },
        ["CoronaProvider.ads.iads"] =
        {
            publisherId = "com.coronalabs",
            supportedPlatforms = { iphone=true, ["iphone-sim"]=true },
        },
        ["CoronaProvider.ads.vungle"] =
        {
            publisherId = "com.vungle",
        },      
    },
 android =
    {

        usesPermissions =
        {
            "android.permission.INTERNET",
            "android.permission.ACCESS_NETWORK_STATE",
        },
    },
}

另外，Android需要增加網路存取的權限

Init the Ads

local adsProvider = {"adMob1","adMob2","vungle","iAds"} 
local ads = require( "ads" )
local adMobAdProvider = "admob"
local iAdsAdProvider = "iads"
local vungleAdProvider = "vungle"
local vungleAppId = "55e4xxxxxx"
local bannerAppID = "ca-app-pub-xxxxxx"
local interstitialAppID = "ca-app-pub-xxxxxx"
local appID = "com.gmail.MyCompany.App"
if ( isAndroid ) then
    bannerAppID = "ca-app-pub-xxxxx"
    interstitialAppID = "ca-app-xxxxxx"
    vungleAppId = "com.gmail.My_Company.App"
end
local lastAdsTypeShown = "none"
local currentAds = 1

local function adMobListener( event )
    local msg = event.response
    -- Quick debug message regarding the response from the library
    print( "Message from the adMob library: ", msg )
 if (event.type == "banner") then
     if ( event.isError ) then
         changeToNextAds()
     else
     end
 elseif(event.type == "interstitial") then
        if ( event.isError ) then
            changeToNextAds()
        elseif ( event.phase == "loaded" ) then
        elseif ( event.phase == "shown" ) then
        end
 end  
end

local function iAdsListener( event )
 local msg = event.response
 print("Message received from the iAds library: ", msg)
 if event.isError then
  changeToNextAds() 
 else
 end  
end

local function vungleListener( event )
   print("Message received from the vungleListener library: ", event.type)

   if ( event.type == "adStart" and event.isError ) then
     changeToNextAds()
   elseif ( event.type == "adEnd" ) then
      -- Ad was successfully shown and ended; hide the overlay so the app can resume.
   else
      print( "Received event", event.type )
   end
   return true
end

function adsInit()
 ads.init( adMobAdProvider, bannerAppID, adMobListener )
 if(isAndroid == false) then
   ads.init( iAdsAdProvider, appID, iAdsListener )    
 end
 ads.init( vungleAdProvider, vungleAppId, vungleListener )
end

我們需要針對AdMob,iAds和Vungle各自呼叫ads.init()，
因為callback回傳的參數不同，所以各自傳入不同callback function，
上面的程式裡，我們在callback function裡發現有錯誤時就換下一個Ads，
至於changeToNextAds()是什麼，看下一段

Change Ads Network

local function changeToNextAds()
 currentAds = currentAds + 1
 if(currentAds > 3) then
  currentAds = 1
 end
 if(adsProvider[currentAds] == "iAds") then
  ads:setCurrentProvider(iAdsAdProvider)
 elseif(adsProvider[currentAds] == "vungle") then
  ads:setCurrentProvider(vungleAdProvider)
 else
  ads:setCurrentProvider(adMobAdProvider)
 end
end

我們透過呼叫ads:setCurrentProvider()來設定新的Ads Network,

Show Ads

function showAds(type,px,py)
 if(adsProvider[currentAds] == "adMob") then
  if(type == "banner") then
   ads.show( type, { x=px, y=py, appId=bannerAppID} )
   return true
  elseif(type == "interstitial") then    
   if(ads.isLoaded(type))then
    ads.show( type, { x=px, y=py, appId=interstitialAppID } )
    return true
   else
    return false
   end 
  end 
 elseif(adsProvider[currentAds] == "vungle") then
  if (type == "interstitial" and ads.isAdAvailable() ) then
      ads.show( "interstitial" )
      return true
  else
   return false
  end   
 elseif(adsProvider[currentAds] == "iAds") then
  ads.show( type, { x=px, y=py} )
  return true
 end
 return false  
end

function loadAds()
 if(adsProvider[currentAds] == "adMob") then
  ads.load( "interstitial", { appId=interstitialAppID} )
 end
end 

Vungle沒有Banner Ads, 它自己會pre-load interstitial Ads,
iAds無法pre-load interstitial Ads，
上面的說明應該很完整，
基本上只要照抄就可以了