Android：measureText()根据缩放像素返回像素

发布于 2024-11-12 17:02:09 字数 304 浏览 6 评论 0原文

所以我使用Paint的measureText()方法来测量一段文本的宽度，但我想根据一定的文本大小来测量文本。假设我想获取一个文本段的宽度，当它占据某个 TextView 时，该宽度将是 20 个缩放像素。我尝试了以下方法：

Paint paint = new Paint();
paint.setTextSize(20);
paint.measureText("sample text");

但是，它似乎不起作用。我相信它返回的是相对于较小文本大小的宽度。我觉得我错过了一些东西，这些东西会让我打自己的脸并大喊“疱疹德普”。

原文

So I use Paint's measureText() method to measure the width of a segment of text, but I wanted to measure text based on a certain text size. Say I wanted to get the width of a text segment that will be 20 scaled pixels when it occupies a certain TextView. I tried the following:

Paint paint = new Paint();
paint.setTextSize(20);
paint.measureText("sample text");

However, it does not seem to be working. I believe it is returning a width with respect to a smaller text size. I feel like I'm missing something that will make me slap myself in the face and yell herp derp.

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渡你暖光 2024-11-19 17:02:09

您需要像这样获得密度乘数：

final float densityMultiplier = getContext().getResources().getDisplayMetrics().density;
final float scaledPx = 20 * densityMultiplier;
paint.setTextSize(scaledPx);
final float size = paint.measureText("sample text");

You need to get the densityMultiplier like so:

final float densityMultiplier = getContext().getResources().getDisplayMetrics().density;
final float scaledPx = 20 * densityMultiplier;
paint.setTextSize(scaledPx);
final float size = paint.measureText("sample text");

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梦一生花开无言 2024-11-19 17:02:09

当我必须的时候我会做这样的事情。

int textSize = 20;
for(int i = 2; i<18 && curTextSize< textSize;i+=2)
{
    this.label.setTextSize(i);
    curTextSize = this.label.getPaint().measureText(this.label.getText().toString());
}

I do something like this when I have to.

int textSize = 20;
for(int i = 2; i<18 && curTextSize< textSize;i+=2)
{
    this.label.setTextSize(i);
    curTextSize = this.label.getPaint().measureText(this.label.getText().toString());
}

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羁〃客ぐ 2024-11-19 17:02:09

我没有足够的声誉点来评论答案，但参考 @schwiz 和 @AndreasEK 对已接受答案的评论：

measureText() 以及 getTextBounds()，不包括填充，因此问题的解决方案可能是添加左右填充（或开始和结束填充）

final float scaleFactor = getContext().getResources().getDisplayMetrics().density;
final float scaledPx = 20 * scaleFactor;
paint.setTextSize(scaledPx);
final float padding = scaleFactor * (textView.getPaddingStart() + textView.getPaddingEnd());
final float size = paint.measureText("sample text") + padding;

I don't have enough reputation points to comment on answers but in reference to the comments by @schwiz and @AndreasEK on the accepted answer:

measureText(), along with getTextBounds(), does not include padding so it's possible that the solution to their problem is to add the left and right padding (or start and end padding)

final float scaleFactor = getContext().getResources().getDisplayMetrics().density;
final float scaledPx = 20 * scaleFactor;
paint.setTextSize(scaledPx);
final float padding = scaleFactor * (textView.getPaddingStart() + textView.getPaddingEnd());
final float size = paint.measureText("sample text") + padding;

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