SpanHelper.java revision d832154e333a3a45b5faecd518b664ddd297183c 
1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.setupwizardlib.span;
18
19import android.text.Spannable;
20
21/**
22 * Contains helper methods for dealing with text spans, e.g. the ones in {@code android.text.style}.
23 */
24public class SpanHelper {
25
26    /**
27     * Add {@code newSpan} at the same start and end indices as {@code oldSpan} and remove
28     * {@code oldSpan} from the {@code spannable}.
29     */
30    public static void replaceSpan(Spannable spannable, Object oldSpan, Object newSpan) {
31        final int spanStart = spannable.getSpanStart(oldSpan);
32        final int spanEnd = spannable.getSpanEnd(oldSpan);
33        spannable.removeSpan(oldSpan);
34        spannable.setSpan(newSpan, spanStart, spanEnd, 0);
35    }
36}
37