Summarize the properties of the controls, many properties are common, not necessarily only the ones I classify can be used
TextView：
android:id : Define a unique identifier for the current control android:layout_width : Specify the width of the control android:layout_height : Specify the height of the control (optional values of the height and width attributes: match_parent (this is more recommended than match_parent)/wrap_content/fill_parent) android:gravity : Specify how the text is aligned (you can use "|" to specify multiple values at the same time) android:textSize : Specify the size of the text (the font size is usually in sp, and the font size will change relative to the system font size ) android:textColor : Specify the color of the text android:text : Specify the displayed content
ImageView：
android:src : specify an image
EditText：
android:hint : Specify a prompt text android:maxLines : Specify the maximum number of lines of EditText
Button：
android:textAllCaps : disable caps conversion
ProgressBar：
android:visibility : Visibility of the control (
visible: visible (default)
invisible: invisible:
invisible, and no longer takes up any screen space) style : Specifies the shape of the progress bar (default is a rotating circle) android:max : Set the maximum value of the progress bar