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/*
* Copyright (C) 2008 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 android.text.style;
import android.annotation.NonNull;
import android.text.TextPaint;
import android.view.View;
/**
* If an object of this type is attached to the text of a TextView
* with a movement method of LinkMovementMethod, the affected spans of
* text can be selected. If selected and clicked, the {@link #onClick} method will
* be called.
* <p>
* The text with a <code>ClickableSpan</code> attached will be underlined and the link color will be
* used as a text color. The default link color is the theme's accent color or
* <code>android:textColorLink</code> if this attribute is defined in the theme.
* For example, considering that we have a <code>CustomClickableSpan</code> that extends
* <code>ClickableSpan</code>, it can be used like this:
* <pre>{@code SpannableString string = new SpannableString("Text with clickable text");
*string.setSpan(new CustomClickableSpan(), 10, 19, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);}</pre>
* <img src="{@docRoot}reference/android/images/text/style/clickablespan.png" />
* <figcaption>Text with <code>ClickableSpan</code>.</figcaption>
*/
public abstract class ClickableSpan extends CharacterStyle implements UpdateAppearance {
private static int sIdCounter = 0;
private int mId = sIdCounter++;
/**
* Performs the click action associated with this span.
*/
public abstract void onClick(@NonNull View widget);
/**
* Makes the text underlined and in the link color.
*/
@Override
public void updateDrawState(@NonNull TextPaint ds) {
ds.setColor(ds.linkColor);
ds.setUnderlineText(true);
}
/**
* Get the unique ID for this span.
*
* @return The unique ID.
* @hide
*/
public int getId() {
return mId;
}
}
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