XML : TextView

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文字：

1. <TextView
   
2.     android:text="Hello, Redd ! :)"
   
3.     android:background="@android:color/darker_gray"
   
4.     android:layout_width="260dp"
   
5.     android:layout_height="310dp" />

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讓寬度、高度配合實際內容：

1. android:layout_width="wrap_content"
   
2. android:layout_height="wrap_content"

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文字大小：

1. android:textSize="45sp"

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sp 這個單位只用在設定文字大小。

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參考文字尺寸：
https://material.google.com/styl ... l#typography-styles

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When choosing font sizes for your app, using too many different sizes can be visually distracting and confuse the user as to what information is important. To be consistent with other apps on the platform, you can use the standard set of type sizes provided by the framework: small, medium, or large.

To use a standard text size (and color), instead of setting the TextView's android:textSize directly, set the android:textAppearance to a predefined theme attribute such as android:textAppearanceLarge:

1. android:textAppearance="?android:textAppearanceLarge"

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As of API 19 (KitKat):
• ?android:textAppearanceSmall is currently 14sp
• ?android:textAppearanceMedium is currently 18sp
• ?android:textAppearanceLarge is currently 22sp

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顏色也可以用十六進位：

1. android:background="#FFFFFF"
   
2. android:textColor="#FF0000"

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色票參考：
http://www.w3schools.com/colors/colors_hex.asp
https://material.google.com/style/color.html#color-color-palette

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英文字母轉成大寫：

1. android:textAllCaps="true"

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Style (bold, italic, bolditalic) ：

1. android:textStyle="bold"

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