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/*
* Copyright (C) 2018 The Android Open Source Project
*
* 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.android.dialer.spannable;
import android.content.Context;
import android.support.annotation.NonNull;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.style.TypefaceSpan;
import com.android.dialer.common.Assert;
/**
* Creates {@link SpannableString SpannableStrings} which are styled appropriately for Dialer
* content with "Learn more" links.
*
* <p>Example usage:
*
* <pre>
* TextView content = ...;
* ContentWithLearnMoreSpanner creator = new ContentWithLearnMoreSpanner(getApplicationContext());
* // myFeatureContent: "Try my feature. <xliff:g example="Learn more">%1$s</xliff:g>"
* String content = getString(R.string.myFeatureContent);
*
* SpannableString spannable = creator.create(content, "https://www.myFeatureHelp.com");
* content.setText(spannable);
* </pre>
*
* Users will see: "Try my feature. Learn more" where "Learn more" links to the given url.
*/
public final class ContentWithLearnMoreSpanner {
private final Context context;
public ContentWithLearnMoreSpanner(@NonNull Context context) {
this.context = context.getApplicationContext();
}
/**
* Creates a spannable string using the given content and learn more url.
*
* @param contentFormatString a format string {@see java.util.Formatter} with a single string
* format parameter, e.g. "Try my feature. %1$s".
* @param learnMoreUrl a url which the "Learn more" text will link to.
* @return a {@link SpannableString}. This string is put together by inserting the text "Learn
* more" into the given {@code contentFormatString}, setting "Learn more" to link to the given
* {@code learnMoreUrl}, then styling the "Learn more" text with common Dialer learn more
* styling. The "Learn more" text uses a non-breaking-space character to ensure it says on a
* single line.
* @throws java.util.IllegalFormatException if {@code contentFormatString} has an improper format
* @throws IllegalArgumentException if it wasn't possible to add "Learn more" to the given
* contentFormatString
*/
@NonNull
public SpannableString create(@NonNull String contentFormatString, @NonNull String learnMoreUrl) {
String learnMore = context.getString(R.string.general_learn_more);
SpannableString contents = new SpannableString(String.format(contentFormatString, learnMore));
Assert.checkArgument(
contents.toString().contains(learnMore),
"Couldn't add learn more link to %s",
contentFormatString);
int learnMoreSpanStartIndex = contents.toString().lastIndexOf(learnMore);
int learnMoreSpanEndIndex = learnMoreSpanStartIndex + learnMore.length();
contents.setSpan(
new TypefaceSpan("sans-serif-medium"),
learnMoreSpanStartIndex,
learnMoreSpanEndIndex,
Spanned.SPAN_INCLUSIVE_INCLUSIVE);
contents.setSpan(
new UrlSpanWithoutUnderline(learnMoreUrl),
learnMoreSpanStartIndex,
learnMoreSpanEndIndex,
Spanned.SPAN_INCLUSIVE_INCLUSIVE);
return contents;
}
}
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