转自:edittext内容随字体大小动态变化,具体代码如下:
package com.yitong.mbank.android.views;
import android.content.Context;
import android.graphics.Paint;
import android.graphics.Paint.FontMetrics;
import android.util.AttributeSet;
import android.widget.EditText;
public class AutoAdjustSizeEditText extends EditText {
private static float DEFAULT_MIN_TEXT_SIZE = 10; // 最小的字体大小
private static float DEFAULT_MAX_TEXT_SIZE = 20;// 验证大部分手机情况下无效值
// Attributes
private Paint testPaint;
private float minTextSize, maxTextSize;
public AutoAdjustSizeEditText(Context context, AttributeSet attrs) {
super(context, attrs);
initialise();
}
private void initialise() {
testPaint = new Paint();
testPaint.set(this.getPaint()); // 获取模拟的paint
// max size defaults to the intially specified text size unless it is
// too small
maxTextSize = this.getTextSize();// 获取单个字体的像素
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();// 获取改TextView的画布可用大小
float trySize = maxTextSize;
float scaled = getContext().getResources().getDisplayMetrics().scaledDensity;
testPaint.setTextSize(trySize * scaled);// 模拟注意乘以scaled
while ((trySize > minTextSize)
&& (testPaint.measureText(text) > availableWidth)) {
trySize -= 2;
FontMetrics fm = testPaint.getFontMetrics();
float scaled1 = (float) (this.getHeight() / (Math
.ceil(fm.descent - fm.top) + 2));
float scaled2 = (float) ((testPaint.measureText(text) / availableWidth));
if (scaled1 >= 1.75 & scaled1 >= scaled2) {// 注意1.75是三星s4 小米3
// 的适合数值(当然包括我的联想了)
break;
}
if (trySize <= minTextSize) {
trySize = minTextSize;
break;
}
testPaint.setTextSize(trySize * scaled);
}
this.setTextSize(trySize);// 等同于this.getPaint().set(trySize*scaled);
}
};
@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);
}
}
}
然后直接在你的xml布局文件中这样使用:
