做法其實很簡單，
Intent intent = new AppInviteInvitation.IntentBuilder(getString(R.string.invitation_title))
.setMessage(getString(R.string.invitation_message))
.setDeepLink(Uri.parse("http://tw.91mai.com/ref/0"))
.build();
startActivityForResult(intent, REQUEST_INVITE);
使用上面的方式將intent丟出，就會開啟邀請好友的選單，在邀請完成後利用onActivityResult去取得邀請的ids
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
Log.d(TAG, "onActivityResult: requestCode=" + requestCode + ", resultCode=" + resultCode);
if (requestCode == REQUEST_INVITE) {
if (resultCode == RESULT_OK) {
// Check how many invitations were sent and show message to the user
// The ids array contains the unique invitation ids for each invitation sent
// (one for each contact select by the user). You can use these for analytics
// as the ID will be consistent on the sending and receiving devices.
String[] ids = AppInviteInvitation.getInvitationIds(resultCode, data);
showMessage(getString(R.string.sent_invitations_fmt, ids.length));
} else {
// Sending failed or it was canceled, show failure message to the user
showMessage(getString(R.string.send_failed));
}
}
}
當你將邀請送出之後，你的朋友就會收到邀請下載的信，
如上方兩張圖，左邊是送出邀請的功能
右邊是好有收到邀請時，安裝後開啟時我們可以從intent中取得相關的link and id
為了要能夠在安裝時取得google play store送給我們的廣播，我們必須註冊receiver
<receiver
android:name="com.google.android.gms.samples.appinvite.ReferrerReceiver"
android:exported="true"
tools:ignore="ExportedReceiver">
<intent-filter>
<action android:name="com.android.vending.INSTALL_REFERRER" />
</intent-filter>
</receiver>
接著我們可以利用下方的程式碼取得相關的資訊
if (!AppInviteReferral.hasReferral(intent)) {
Log.e(TAG, "Error: Intent does not contain App Invite");
// Extract referral information from the
String invitationId = AppInviteReferral.getInvitationId(
String deepLink = AppInviteReferral.getDeepLink(intent);
如果我們不需要track 成效的話，邀請的功能在這邊已經結束了
接下來要講的就是，我們可以利用google play service新的api 來trace我們的成效
在使用朋友贈送的信件開啟我們的app之後，我們可以利用google play service來track成效，
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.enableAutoManage(this, 0, this)
.addApi(AppInvite.API)
.build();
利用AppInvite.API 在api connect成功之後
String invitationId = AppInviteReferral.getInvitationId(intent);
// Note: these calls return PendingResult(s), so one could also wait to see
// if this succeeds instead of using fire-and-forget, as is shown here
if (AppInviteReferral.isOpenedFromPlayStore(intent)) {
AppInvite.AppInviteApi.updateInvitationOnInstall(mGoogleApiClient, invitationId);
}
// If your invitation contains deep link information such as a coupon code, you may
// want to wait to call `convertInvitation` until the time when the user actually
// uses the deep link data, rather than immediately upon receipt
AppInvite.AppInviteApi.convertInvitation(mGoogleApiClient, invitationId);
我們可以取得inviteationId ，然後利用 updateInvitationOnInstall 告訴google analytics這個user已經成功安裝.
假設這個邀請是希望新安裝的user可以使用優惠券，那我們可以利用
convertInvitation告訴google analytics有多少使用者安裝後並且成功使用優惠券
也就是可以取得轉換率(我是這樣理解的XD)
最後，由於我是直接拿google 的sample就直接附上相關的網址吧，
有興趣的人可以去那邊做更深入的了解
https://developers.google.com/app-invites/android/guides/app?configured=true
然後下面的網址是appinvite設定的小幫手，在裡面跟著步驟設定之後，你google developer console的設定也會設定完成，個人覺得這個新界面真的是好用很多，大家可以參考看看
https://developers.google.com/mobile/add?platform=android&cntapi=appinvites&cnturl=https:%2F%2Fdevelopers.google.com%2Fapp-invites%2Fandroid%2Fguides%2Fapp%3Fconfigured%3Dtrue%23add-config&cntlbl=Continue%20Adding%20App%20Invites
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