我已經匯入了
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.0.2'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
testImplementation 'junit:junit:4.12'
implementation'com.google.code.findbugs:jsr305:3.0.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.0'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
implementation 'androidx.annotation:annotation:+'
implementation 'com.android.support:design:28.2.0'
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support:design:28.0.0'
implementation 'com.android.support:cardview-v7:28.0.0'
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation 'com.android.support:design:28.0.0'
implementation 'com.android.support:support-annotations:28.0.0'
implementation 'com.android.support:support-annotations:28.0.0'
都沒有錯，但是這個design就是一直標紅，
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