渲染前如何获取textview的行数? [英] How to get line count of textview before rendering?

问题描述

如何在呈现字符串之前获取字符串在 TextView 中占用的行数.

How can I get the number of lines a string will take up in a TextView before it is rendered.

A ViewTreeObserver 将不起作用，因为它们仅在渲染后才会被触发.

A ViewTreeObserver will not work because those are only fired after it is rendered.

推荐答案

final Rect bounds = new Rect();
final Paint paint = new Paint();
paint.setTextSize(currentTextSize);
paint.getTextBounds(testString, 0, testString.length(), bounds);

现在将文本的宽度除以 TextView 的宽度以获得总行数.

Now divide the width of text with the width of your TextView to get the total number of lines.

final int numLines = (int) Math.ceil((float) bounds.width() / currentSize);

currentSize :将呈现文本的视图的预期大小.尺寸不应超过屏幕宽度.

currentSize : Expected size of the view in which the text will be rendered. The size should not go beyond the screen width.

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