gradle报错

[wuxinxinggg]

Failed to sync Gradle project 'AndroidNewWidgetsDemo'
Error:No cached version of com.android.tools.build:gradle:1.2.3 available for offline mode.
Disable Gradle 'offline mode' and sync project

[opengit]

@wuxinxinggg please uncheck the offline work.

[wuxinxinggg]

error occurs after the setting, it seems the GFW lead to the result.

how can we deal with gradle of GFW. I've tried to use the source of os china as bellow,but it can't find it.

   repositories {
        maven { url 'http://maven.oschina.net/content/groups/public/'}
        //jcenter()
    }

Errors:

Error:Could not find com.android.tools.build:gradle:1.2.3.
Searched in the following locations:
    file:/C:/Program Files/Android/Android Studio1/gradle/m2repository/com/android/tools/build/gradle/1.2.3/gradle-1.2.3.pom
    file:/C:/Program Files/Android/Android Studio1/gradle/m2repository/com/android/tools/build/gradle/1.2.3/gradle-1.2.3.jar
    http://maven.oschina.net/content/groups/public/com/android/tools/build/gradle/1.2.3/gradle-1.2.3.pom
    http://maven.oschina.net/content/groups/public/com/android/tools/build/gradle/1.2.3/gradle-1.2.3.jar
Required by:
    :AndroidNewWidgetsDemo:unspecified