TextView control

Basic attributes

• layout_width, the height of the component
  • match_parent width takes the width outside it (parent container)
  • wrap_content automatically allocates its width based on the content inside the control
  • Write the value directly (not recommended)
• layout_height, the height of the component
• id, the ID of the component
• text, text content
• textColor sets the font color ( eight digits, hexadecimal, two digits together, transparency, RGB )
• textStyle, set the font style, three options, normal (no effect), bold (bold), italic (italic)
• textSize, font size, unit is generally sp
• background, the background of the component
• Gravity, sets the alignment direction of the content in the component, TextView is text, ImageView is picture, etc.

Text and color values ​​in XML must be written in res and standardized

This is to adapt to different types and styles. It only requires a few XMLs and does not require repeated development.

TextView with shadow

android:shadowColor, sets the shadow color, needs to be used with shadowRadius

android: shadowRadius, set the blur level of the shadow. If it is set to 0.1, it will become the font color. It is recommended to use 3.0

android: shadowDx, sets the offset of the shadow in the horizontal direction, that is, the abscissa of the start of the horizontal shadow

android:shadowDy, same as above

TextView to achieve marquee effect

android: singleLine, set the content to be displayed in a single line, which has been deprecated. Use lines="1", but it can be used with singleLine, but lines cannot run.

android: focusable, whether it can get focus

android: focusableInTouchMode, used to control whether focus can be done in touch mode

android: ellipsize, where to omit text, use marquee

android:marqueeRepeatLimit, the number of times the letter animation is repeated

How to make him run

• Set processing method, clickable
• Use a custom view, inherit from the TextView class, implement the first three construction methods, call isfocus, and return True. Change XML to custom class
• Use <requestFocus/> inside a tag

The main idea is: words have multiple columns or lines, the ability to obtain focus, whether focus is provided within the program or interactively, and three methods of providing focus

    <com.example.android003.Mypamadeng
        android:layout_width="match_parent"
        android:layout_height="103dp"
        android:gravity="center_vertical"
        android:shadowColor="@color/red"
        android:shadowDx="10"
        android:shadowDy="10"
        android:shadowRadius="3"
        android:text="@string/jieke"
        android:textColor="@color/blue"
        android:textSize="@android:dimen/app_icon_size"
        android:singleLine="true"
        android:ellipsize="marquee"
        android:focusable="true"
        android:marqueeRepeatLimit="marquee_forever"
        android:focusableInTouchMode="true">
    </com.example.android003.Mypamadeng>