Program type already present: android.support.design.widget.CoordinatorLayout$Behavior

调试过程中如果出现上述错误 

最好的解决办法是把build.gradle文件中的下面部分：

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support:design:27.1.1'
    implementation 'com.android.support:recyclerview-v7:27.1.1'
    implementation 'com.android.support:cardview-v7:27.1.1'
}修改为一样