设置字间距

来源： http://stackoverflow.com/questions/1640659/how-to-adjust-text-kerning-in-android-textview/16429758#16429758

1、直接设置

    
    
    
    

     
     
     
     
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;
     
     
     
     
}
    
    
    
    

2、自定义控件

    
    
    
    

     
     
     
     
/**
     
     
     
     
 * 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;
     
     
     
     
 }
     
     
     
     
}
    
    
    
    

调用方法：

    
    
    
    

     
     
     
     
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);
    
    
    
    

来自为知笔记(Wiz)