根据屏幕密度缩放字体大小

Question

I know in Android that you can scale the images based on screen densities. For instance, if mdpi is the baseline,

• hdpi = 1.5 * mdpi
• xhdpi = 2 * mdpi
• xxhdpi = 3 * mdpi
• xxxhdpi = 4 * mdpi.

Are there similar values for font size?

Answer 1

what you need to do is to perform a conversion using the scaleDensity ( here the documentation) value, member of the DisplayMetrics class. From the documentation

A scaling factor for fonts displayed on the display. This is the same as density, except that it may be adjusted in smaller increments at runtime based on a user preference for the font size.

Answer 2

Exactly the same values might be used for font size

android:textSize="18dp"

Although it's recommended to use sp (scale independent pixels). It's almost the same thing as dp , but it might scale-up based on user accessibility settings (for instance, if you haw low vision, you can scale-up font size affecting how sp is calculated). So, in the end it becomes:

android:textSize="18sp"

Once again, if you're using default settings, 1dp == 1sp

Answer 3

如果要以编程方式执行此操作：

view.setTextSize(TypedValue.COMPLEX_UNIT_SP, textSize);

Answer 4

1. Create these 5 folders in your res folder
   values-ldpi
values-mdpi
values-hdpi
values-xhdpi
values-xxhdpi
   
   
2. And add dimens.xml in each folder.
   
3. Paste this code in each dimens.xml

 <?xml version="1.0" encoding="utf-8"?> <resources> <dimen name="font_size">72sp</dimen> </resources> 

Depending of Screen density change the font size.