Android Studio：Error:Could not find com.android.tools.build:gradle:XXX解决方法

Android Studio下的 Error:Could not find com.android.tools.build:gradle:XXX解决方法

Android studio 更新后报错：

    Gradle sync failed: Could not find com.android.tools.build:gradle:3.3.
        Searched in the following locations:
        file:/D:/Android/android-studio/gradle/m2repository/com/android/tools/build/gradle/3.3/gradle-3.3.pom
        file:/D:/Android/android-studio/gradle/m2repository/com/android/tools/build/gradle/3.3/gradle-3.3.jar
        https://jcenter.bintray.com/com/android/tools/build/gradle/3.3/gradle-3.3.pom
        https://jcenter.bintray.com/com/android/tools/build/gradle/3.3/gradle-3.3.jar
        Required by:
        project :
        Consult IDE log for more details (Help | Show Log) (1s 958ms)

解决方法：

找到你Android studio 目录
D:\Android\android-studio\gradle\m2repository\com\android\tools\build\gradle
查看gradle有什么版本：

然后在项目的build.gradle文件里修改gradle版本号：

重新build一下就好了。