Android将TextView文本大小设置为在所有屏幕大小上都相同 [英] Android set TextView text size to look the same on all screen sizes

问题描述

我有一个方形LinearLayout，其中包含其他一些LinearLayouts，其中包含ImageViews和TextViews.用户更改布局内容后，我将布局内容另存为png文件.所有图像和文本都使用常规的gravity和layout_gravity值进行排列.这是一个小样本:

I have a square LinearLayout containing a few other LinearLayouts with ImageViews and TextViews inside. I am saving the layout content as png file after the user changes it. All the Images and Texts are being arranged using the general gravity and layout_gravity values. Here is a small sample:

这是我的问题:我希望SAMPLE TEXT在所有屏幕尺寸上看起来都完全相同，无论是480p的电话还是1200p的平板电脑.最初，我认为在SP中设置文本大小就足够了，但事实并非如此，因为随着屏幕分辨率变大，文本变小.

Here is my problem: I want the SAMPLE TEXT to look exactly the same size on all screen sizes, being a phone of 480p or a tablet of 1200p. Initially I thought that setting the text size in SP will be enought but it is not, because as screen resolution gets bigger, the text gets smaller.

所以我的问题是，如何以编程方式设置文本大小，使其看起来完全相同，而与屏幕宽度无关.如您所见，父布局将始终是正方形.

So my question is, how can I programatically set the text size so it will look exactly of the same size, independent of screen width. As you can see the parent layout will always be a square.

我尝试以编程方式设置SP或使用比例因子.

I tried programatically setting SP or using a scale factor.

float scale = 0;

if (screenWidth == 720) {
        scale = 1;
} else {
        scale = (720 - screenWidth) * 100.2f / screenWidth;
}

float defaultSizeFor720 = 35f;

textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, defaultSizeFor720 * scale);

它不起作用.随着屏幕变大，文本变小，但不像仅使用SP时那样小，但仍然如此.我也尝试了其他问题的大多数答案，但仍然没有用. 有什么想法吗?

It does not work. as screen gets bigger, text gets smaller, not as small as when only using SP alone, but still. I also tried most of the answers from other questions but still did not work. Any ideas?

推荐答案

我发现的唯一可靠的方法是:

The only reliable method I found was:

• 具有默认屏幕尺寸的文本高度
• 根据当前屏幕尺寸缩放此文本高度

• 在文本大小中找到最佳匹配以适合所需的高度

• have a text height for a default screen size
• scale this text height based on current screen size

• find the best match in text size to fit the needed height

float DEFAULT_SCREEN_WIDTH = 720f;

float TEXT_HEIGHT = 50f;
float sizeLine1 = (screenWidth * TEXT_HEIGHT) / DEFAULT_SCREEN_WIDTH;
Rect bounds = new Rect();
int textSize = 1;
while (bounds.height() < sizeLine1) {
    textSize++;
    txtLine1.getPaint().setTextSize(textSize);
    txtLine1.getPaint().getTextBounds("test", 0, "test".length(), bounds);
}

可能不雅致或高效，但是可以接受并且确实有效.平板电脑1200p和480p手机之间存在细微的差异，但就我而言，这是可以的.

Might not be elegant or efficient, but it is acceptable, and does work. There are minor differences between tablet 1200p and 480p phones, but these are OK in my case.

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