找不到符号 import android.support.v4.app.Fragment[…]
Android小知识 - The specified Android SDK Build Tools version (28.0.3) is ignored
The specified Android SDK Build Tools version (28.0.3) is ignored, as it is below the minimum supported version (29.0.2) for Android Gradle Plugin 4.0.1.[…]
Android小知识 - “android.support.v4.content” that cannot be safely rewritten. for androidx
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Android小知识 - “Android Error Building Signed APK”
Android Error Building Signed APK: xxx.jks not found for signing config “externalOverride”[…]