/**
* 通过x轴间距,计算出字体大小,自动适应宽度
*
* @param paint the Paint to set the text size for
* @param desiredWidth the desired width
* @param text the text that should be that width
* @return
*/
private void setTextSizeForWidth(Paint paint, float desiredWidth, String text) {
// Pick a reasonably large value for the test. Larger values produce
// more accurate results, but may cause problems with hardware
// acceleration. But there are workarounds for that, too; refer to
// http://stackoverflow.com/questions/6253528/font-size-too-large-to-fit-in-cache
final float testTextSize = 48f;
// Get the bounds of the text, using our testTextSize.
paint.setTextSize(testTextSize);
Rect bounds = new Rect();
paint.getTextBounds(text, 0, text.length(), bounds);
// Calculate the desired size as a proportion of our testTextSize.
float desiredTextSize = testTextSize * desiredWidth / bounds.width();
// 如果计算出的字体高度小于预设值
if (bottomTextSize > desiredTextSize) {
// Set the paint for that size.
paint.setTextSize(desiredTextSize);
} else {
paint.setTextSize(bottomTextSize);
}
}
