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1/**
2 * Text view that allows changing the letter spacing of the text.
3 * 
4 * @author Pedro Barros (pedrobarros.dev at gmail.com)
5 * @since May 7, 2013
6 */
7 public static class LetterSpacingTextView extends TextView {
8        private float spacing = Spacing.NORMAL;
9        private CharSequence originalText = "";
10
11        public LetterSpacingTextView(Context context) {
12            super(context);
13        }
14
15        public LetterSpacingTextView(Context context, AttributeSet attrs) {
16            super(context, attrs);
17        }
18
19        public LetterSpacingTextView(Context context, AttributeSet attrs, int defStyle) {
20            super(context, attrs, defStyle);
21        }
22
23        public float getSpacing() {
24            return this.spacing;
25        }
26
27        public void setSpacing(float spacing) {
28            this.spacing = spacing;
29            applySpacing();
30        }
31
32        @Override
33        public void setText(CharSequence text, BufferType type) {
34            originalText = text;
35            applySpacing();
36        }
37
38        @Override
39        public CharSequence getText() {
40            return originalText;
41        }
42
43        private void applySpacing() {
44            if (this == null || this.originalText == null) return;
45            StringBuilder builder = new StringBuilder();
46            for (int i = 0; i < originalText.length(); i++) {
47                builder.append(originalText.charAt(i));
48                if (i + 1 < originalText.length()) {
49                    builder.append("\u00A0");
50                }
51            }
52            SpannableString finalText = new SpannableString(builder.toString());
53            if (builder.toString().length() > 1) {
54                for (int i = 1; i < builder.toString().length(); i += 2) {
55                    finalText.setSpan(new ScaleXSpan((spacing + 1) / 10), i, i + 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
56                }
57            }
58            super.setText(finalText, BufferType.SPANNABLE);
59        }
60
61        public class Spacing {
62            public final static float NORMAL = 0;
63        }
64    }