设置字间距

public static Spannable applyKerning(CharSequence src, float kerning, int start, int end){

if (src == null)

return null;

final int srcLength = src.length();

if (srcLength < 2)

return src instanceof Spannable ? (Spannable)src: new SpannableString(src);

if (start < 0)

start = 0;

if (end > srcLength)

end = srcLength;

final String nonBreakingSpace = "\u00A0";

final SpannableStringBuilder builder = src instanceof SpannableStringBuilder ? (SpannableStringBuilder)src: new SpannableStringBuilder(src);

    for (int i = src.length(); i >= 1; i--) {  

   builder.insert(i, nonBreakingSpace);  

   builder.setSpan(new ScaleXSpan(kerning), i, i + 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

}

return builder;

}

/**

* Text view that allows changing the letter spacing of the text.

*

*@author Pedro Barros (pedrobarros.dev at gmail.com)

*@since May 7, 2013

*/

import android.content.Context;

import android.text.Spannable;

import android.text.SpannableString;

import android.text.style.ScaleXSpan;

import android.util.AttributeSet;

import android.widget.TextView;

public class LetterSpacingTextView extends TextView {

private float letterSpacing = LetterSpacing.NORMAL;

private CharSequence originalText = "";

public LetterSpacingTextView(Context context) {

   super(context);

}

public LetterSpacingTextView(Context context, AttributeSet attrs){

   super(context, attrs);

}

public LetterSpacingTextView(Context context, AttributeSet attrs, int defStyle){

   super(context, attrs, defStyle);

}

public float getLetterSpacing() {

   return letterSpacing;

}

public void setLetterSpacing(float letterSpacing) {

   this.letterSpacing = letterSpacing;

   applyLetterSpacing();

}

@Override

public void setText(CharSequence text, BufferType type) {

   originalText = text;

   applyLetterSpacing();

}

@Override

public CharSequence getText() {

   return originalText;

}

private void applyLetterSpacing() {

   StringBuilder builder = new StringBuilder();

   for(int i = 0; i < originalText.length(); i++) {

  builder.append(originalText.charAt(i));

  if(i+1 < originalText.length()) {

 builder.append("\u00A0");

  }

   }

   SpannableString finalText = new SpannableString(builder.toString());

   if(builder.toString().length() > 1) {

  for(int i = 1; i < builder.toString().length(); i+=2) {

 finalText.setSpan(new ScaleXSpan((letterSpacing+1)/10), i, i+1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

  }

   }

   super.setText(finalText, BufferType.SPANNABLE);

}

public class LetterSpacing {

   public final static float NORMAL = 0;

}

}

LetterSpacingTextView textView = new LetterSpacingTextView(context);

textView.setLetterSpacing(10); //Or any float. To reset to normal, use 0 or LetterSpacingTextView.LetterSpacing.NORMAL

textView.setText("My text");

//Add the textView in a layout, for instance:

((LinearLayout) findViewById(R.id.myLinearLayout)).addView(textView);