本文实例讲述了android编程实现自动调整textview字体大小以适应文字长度的方法。分享给大家供大家参考，具体如下：
我要评论
package com.test.android.textview;
import android.content.context;
import android.graphics.paint;
import android.util.attributeset;
import android.widget.textview;
public class customtextview extends textview {
private static float default_min_text_size = 10;
private static float default_max_text_size = 20;
// attributes
private paint testpaint;
private float mintextsize;
private float maxtextsize;
public customtextview(context context, attributeset attrs) {
super(context, attrs);
initialise();
}
private void initialise() {
testpaint = new paint();
testpaint.set(this.getpaint());
// max size defaults to the intially specified text size unless it is
// too small
maxtextsize = this.gettextsize();
if (maxtextsize <= default_min_text_size) {
maxtextsize = default_max_text_size;
}
mintextsize = default_min_text_size;
}
/**
* re size the font so the specified text fits in the text box * assuming
* the text box is the specified width.
*/
private void refittext(string text, int textwidth) {
if (textwidth > 0) {
int availablewidth = textwidth - this.getpaddingleft() -
this.getpaddingright();
float trysize = maxtextsize;
testpaint.settextsize(trysize);
while ((trysize > mintextsize) &&
(testpaint.measuretext(text) > availablewidth)) {
trysize -= 1;
if (trysize <= mintextsize) {
trysize = mintextsize;
break;
}
testpaint.settextsize(trysize);
}
this.settextsize(trysize);
}
}
@override
protected void ontextchanged(charsequence text, int start, int before,
int after) {
super.ontextchanged(text, start, before, after);
refittext(text.tostring(), this.getwidth());
}
@override
protected void onsizechanged(int w, int h, int oldw, int oldh) {
if (w != oldw) {
refittext(this.gettext().tostring(), w);
}
}
}
希望本文所述对大家android程序设计有所帮助。
如对本文有疑问， 点击进行留言回复！！
Codeforces C. A Cookie for You (模拟 / 分类 / 贪心) (Round #654 Div.2)
DialogFragment弹窗（带黑色透明背景和不带黑色透明背景）
网友评论