apply Kerning to Spannable - Android Graphics

Android examples for Graphics:Spannable

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Description

apply Kerning to Spannable

Demo Code

/*/* www .ja v a 2  s . c o  m*/
 * Copyright 2015 Fred Grott(GrottWorkShop)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//package com.java2s;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.style.ScaleXSpan;

public class Main {
    /**
     *
     * @param src the Character sequence to apply kerning to
     * @param kerning the float kerning value
     * @param start what position in the CharSequence to start applying kerning
     * @param end what end position in the CharSequence to end applying kerning
     * @return a SpannableStringBuilder result
     */
    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;
    }
}

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