android:exported=”false”
Determines whether other apps can access the content provider. For your stub content provider, set the value to false, since there’s no need to allow other apps to see the provider. This value doesn’t affect the interaction between the sync adapter framework and the content provider.
Manifest中這個屬性設置爲false，則你的外部app沒有權利訪問你的contentprovider。
prioritization n. 優先次序；優化；優先化
semantics n. [語] 語義學；語義論
