The following attribute set like android: textSize etc. With android: at the beginning of attributes available in the official documentation XML attributes, but begin with app: properties are not

In official documents where you can see these properties of concentrated,

Android: textAlignment="center"
Android: textSize="20 sp"

App: layout_constraintEnd_toEndOf="parent"
App: layout_constraintStart_toStartOf="parent"
App: layout_constraintTop_toTopOf="parent"

CodePudding user response:

https://developer.android.google.cn/reference/android/support/constraint/ConstraintLayout

CodePudding user response:

reference 1st floor BDMH response:

https://developer.android.google.cn/reference/android/support/constraint/ConstraintLayout

, 1/f, positive solutions (as saying the building Lord, you this is 15 years of experience in the CSDN Android do?)