Java 如何为 Paint.setTextSize() 设置单位
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How to set unit for Paint.setTextSize()
提问by Yverman
Is it possible to change the unit for Paint.setTextSize()? As far as I know, it's pixel but I like to set the text size in DIP for multiple screen support.
可以换单位Paint.setTextSize()吗？据我所知，它是像素，但我喜欢在 DIP 中设置文本大小以支持多屏幕。
采纳答案by Alex Volovoy
Convert it like this
像这样转换
// The gesture threshold expressed in dip
private static final float GESTURE_THRESHOLD_DIP = 16.0f;
// Convert the dips to pixels
final float scale = getContext().getResources().getDisplayMetrics().density;
mGestureThreshold = (int) (GESTURE_THRESHOLD_DIP * scale + 0.5f);
// Use mGestureThreshold as a distance in pixels
from here http://developer.android.com/guide/practices/screens_support.html#dips-pels
从这里http://developer.android.com/guide/practices/screens_support.html#dips-pels
回答by Felipe Caldas
I know this topic is old and already answered but I would like to also suggest this piece of code:
我知道这个话题很旧并且已经回答了，但我也想推荐这段代码：
int MY_DIP_VALUE = 5; //5dp
int pixel= (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
MY_DIP_VALUE, getResources().getDisplayMetrics());
回答by pelotasplus
And here is even shorter method to convert dp-s to px-els taking display metrics into account
这是将 dp-s 转换为 px-els 的更短的方法，将显示指标考虑在内
回答by Tanner Perrien
If your Paint object is being used to draw text on a Canvas, you can let the Canvas handle scaling for you.
如果您的 Paint 对象用于在 Canvas 上绘制文本，您可以让 Canvas 为您处理缩放。
When calling Canvas.drawText()the text size is first determined by the passed in Paintobject, which can be set via Paint.setTextSize(). The text size is automatically scaled by Canvasbased on the canvas density, which can be found using Canvas.getDensity().
调用时Canvas.drawText()文本大小首先由传入的Paint对象决定，可以通过Paint.setTextSize(). 文本大小Canvas根据画布密度自动缩放，可以使用Canvas.getDensity().
When setting the text size on a paint object that will be drawn on Canvas, work with a unit value of dpor spand let Canvas handle the scaling for you.
在将在 Canvas 上绘制的绘画对象上设置文本大小时，请使用单位值dporsp并让 Canvas 为您处理缩放。
回答by Suragch
The accepted answer is for gestures, not setting text size. The highest voted answer (at the time of this writing) is close, but the documentation recommends using sprather than dpbecause in addition to being scaled for screen densities (as dpvalues are), spis also scaled according to user preferred font sizes.
接受的答案是针对手势，而不是设置文本大小。最高投票的答案（在撰写本文时）接近，但文档建议使用sp而不是dp因为除了根据屏幕密度（如dp值）进行sp缩放外，还根据用户首选字体大小进行缩放。
From an intin code
从int代码
int spSize = 17;
float scaledSizeInPixels = spSize * getResources().getDisplayMetrics().scaledDensity;
mTextPaint.setTextSize(scaledSizeInPixels);
Or alternatively
或者替代地
int spSize = 17;
float scaledSizeInPixels = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
spSize, getResources().getDisplayMetrics());
mTextPaint.setTextSize(scaledSizeInPixels);
From resources
来自资源
Or if you have the spor dpvalue in resources:
或者，如果您在资源中具有sp或dp价值：
<resources>
<dimen name="fontSize">17sp</dimen>
</resources>
with
和
float scaledSizeInPixels = getResources().getDimensionPixelSize(R.dimen.fontSize);
mTextPaint.setTextSize(scaledSizeInPixels);
Other links
其他链接
