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      1 /*
      2  * Copyright (C) 2018 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 
     17 package com.android.settings.utils;
     18 
     19 import android.content.ActivityNotFoundException;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.text.Annotation;
     23 import android.text.SpannableString;
     24 import android.text.SpannableStringBuilder;
     25 import android.text.TextPaint;
     26 import android.text.style.URLSpan;
     27 import android.util.Log;
     28 import android.view.View;
     29 
     30 /**
     31  * This class is used to add {@link View.OnClickListener} for the text been wrapped by
     32  * annotation.
     33  */
     34 public class AnnotationSpan extends URLSpan {
     35 
     36     private final View.OnClickListener mClickListener;
     37 
     38     private AnnotationSpan(View.OnClickListener lsn) {
     39         super((String) null);
     40         mClickListener = lsn;
     41     }
     42 
     43     @Override
     44     public void onClick(View widget) {
     45         if (mClickListener != null) {
     46             mClickListener.onClick(widget);
     47         }
     48     }
     49 
     50     @Override
     51     public void updateDrawState(TextPaint ds) {
     52         super.updateDrawState(ds);
     53         ds.setUnderlineText(false);
     54     }
     55 
     56     public static CharSequence linkify(CharSequence rawText, LinkInfo... linkInfos) {
     57         SpannableString msg = new SpannableString(rawText);
     58         Annotation[] spans = msg.getSpans(0, msg.length(), Annotation.class);
     59         SpannableStringBuilder builder = new SpannableStringBuilder(msg);
     60         for (Annotation annotation : spans) {
     61             final String key = annotation.getValue();
     62             int start = msg.getSpanStart(annotation);
     63             int end = msg.getSpanEnd(annotation);
     64             AnnotationSpan link = null;
     65             for (LinkInfo linkInfo : linkInfos) {
     66                 if (linkInfo.mAnnotation.equals(key)) {
     67                     link = new AnnotationSpan(linkInfo.mListener);
     68                     break;
     69                 }
     70             }
     71             if (link != null) {
     72                 builder.setSpan(link, start, end, msg.getSpanFlags(link));
     73             }
     74         }
     75         return builder;
     76     }
     77 
     78     /**
     79      * Data class to store the annotation and the click action
     80      */
     81     public static class LinkInfo {
     82         private static final String TAG = "AnnotationSpan.LinkInfo";
     83         public static final String DEFAULT_ANNOTATION = "link";
     84         private final String mAnnotation;
     85         private final Boolean mActionable;
     86         private final View.OnClickListener mListener;
     87 
     88         public LinkInfo(String annotation, View.OnClickListener listener) {
     89             mAnnotation = annotation;
     90             mListener = listener;
     91             mActionable = true; // assume actionable
     92         }
     93 
     94         public LinkInfo(Context context, String annotation, Intent intent) {
     95             mAnnotation = annotation;
     96             if (intent != null) {
     97                 mActionable = context.getPackageManager()
     98                         .resolveActivity(intent, 0 /* flags */) != null;
     99             } else {
    100                 mActionable = false;
    101             }
    102             if (!mActionable) {
    103                 mListener = null;
    104             } else {
    105                 mListener = view -> {
    106                     try {
    107                         view.startActivityForResult(intent, 0);
    108                     } catch (ActivityNotFoundException e) {
    109                         Log.w(TAG, "Activity was not found for intent, " + intent);
    110                     }
    111                 };
    112             }
    113         }
    114 
    115         public boolean isActionable() {
    116             return mActionable;
    117         }
    118     }
    119 }
    120