固定Textview，字体随着字数的多少字体动态变化大小

package de.ankri.views;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.TextView;
import de.ankri.R;

/**
* A custom Text View that lowers the text size when the text is to big for the TextView. Modified version of one found on stackoverflow
*
* @author Andreas Krings - www.ankri.de
* @version 1.0
*
*/
public class AutoScaleTextView extends TextView
{
private Paint textPaint;

private float preferredTextSize;
private float minTextSize;

public AutoScaleTextView(Context context)
{
this(context, null);
}

public AutoScaleTextView(Context context, AttributeSet attrs)
{
this(context, attrs, R.attr.autoScaleTextViewStyle);

// Use this constructor, if you do not want use the default style
// super(context, attrs);
}

public AutoScaleTextView(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);

this.textPaint = new Paint();

TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AutoScaleTextView, defStyle, 0);
this.minTextSize = a.getDimension(R.styleable.AutoScaleTextView_minTextSize, 10f);
a.recycle();

this.preferredTextSize = this.getTextSize();
}

/**
* Set the minimum text size for this view
*
* @param minTextSize
*            The minimum text size
*/
public void setMinTextSize(float minTextSize)
{
this.minTextSize = minTextSize;
}

/**
* Resize the text so that it fits
*
* @param text
*            The text. Neither <code>null</code> nor empty.
* @param textWidth
*            The width of the TextView. > 0
*/
private void refitText(String text, int textWidth)
{
if (textWidth <= 0 || text == null || text.length() == 0)
return;

// the width
int targetWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();

final float threshold = 0.5f; // How close we have to be

this.textPaint.set(this.getPaint());

while ((this.preferredTextSize - this.minTextSize) > threshold)
{
float size = (this.preferredTextSize + this.minTextSize) / 2;
this.textPaint.setTextSize(size);
if (this.textPaint.measureText(text) >= targetWidth)
this.preferredTextSize = size; // too big
else
this.minTextSize = size; // too small
}
// Use min size so that we undershoot rather than overshoot
this.setTextSize(TypedValue.COMPLEX_UNIT_PX, this.minTextSize);
}

@Override
protected void onTextChanged(final CharSequence text, final int start, final int before, final int after)
{
this.refitText(text.toString(), this.getWidth());
}

@Override
protected void onSizeChanged(int width, int height, int oldwidth, int oldheight)
{
if (width != oldwidth)
this.refitText(this.getText().toString(), width);
}

}

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