2 回答

TA貢獻1890條經驗 獲得超9個贊
在您的應用程序 Gradle 文件中,檢查implementation 'com.android.support:design:28.0.0'
您的dependencies

TA貢獻1804條經驗 獲得超3個贊
查看您的 Logcat,它顯示了問題所在。
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myapplication/com.example.myapplication.MainActivity}: android.view.InflateException: Binary XML file line #9: Binary XML file line #9: Error inflating class android.support.design.widget.AppBarLayout
...
Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.design.widget.AppBarLayout" on path: DexPathList[[zip file "/data/app/com.example.myapplication-y9OZiywnTa-bCM9Op2luAw==/base.apk"],nativeLibraryDirectories=[/data/app/com.example.myapplication-y9OZiywnTa-bCM9Op2luAw==/lib/arm, /system/lib, /vendor/lib]]
所以,這意味著它無法啟動您的活動MainAcitivty,因為它找不到類AppBarLayout。您可能缺少依賴項。
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