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Android如何改变TextView字体间距

IT知识textView

生也有涯，知也无涯。这篇文章主要讲述Android如何改变TextView字体间距相关的知识，希望能为你提供帮助。
【Android如何改变TextView字体间距】方法：
1.自定义字体，在其中添加间距，较复杂
2.字母间加空格，不太可取，宽度不灵活
3.用textScaleX和space，自定义TextView,让textScaleX只改变间距，不改变字体
4.复写onDraw，每次画一个字符，手动控制每个字符的位置。
 
下面提供方法3的代码，参考链接：
https://stackoverflow.com/questions/14283246/change-text-kerning-or-spacing-in-textview

package nl.raakict.android.spc.widget; 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.BIGGEST; private CharSequence originalText = ""; public LetterSpacingTextView(Context context) { super(context); }public LetterSpacingTextView(Context context, AttributeSet attrs){ super(context, attrs); originalText = super.getText(); applyLetterSpacing(); this.invalidate(); }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++) { String c = ""+ originalText.charAt(i); builder.append(c.toLowerCase()); 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; public final static float NORMALBIG = (float)0.025; public final static float BIG = (float)0.05; public final static float BIGGEST = (float)0.2; } }






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