解決〞Design editor is unavailable until after a successful project sync〞

將舊案從Eclipse匯入到Android studio，點選MainActivity.xml想改畫面卻一直出現底下的訊息

查了下資料，看到這篇android studio 新建一個專案，卻出現Design editor is unavailable until after a successful project sync，看起來點選File -> sync project with Gradle Files，出現Erorr：“The minSdk version should not be declared in the android manifest file. You can move the version from the manifest to the defaultConfig in the build.gradle file.〞

找半天找到AndroidManifes.xml，查看發現有底下這句

<uses-sdk android:minSdkVersion="7" android:targetSdkVersion="17"/>

將它mark掉後，再點選File -> sync project with Gradle Files，就build成功可以使用了

參考網址：

android studio 新建一個專案，卻出現Design editor is unavailable until after a successful project sync