TermsListAdapter.java revision 77bde860481225e2ecdff18e9669f877d2a74ae7 
1/*
2 * Copyright 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 */
16package com.android.managedprovisioning.preprovisioning.terms;
17
18import static com.android.internal.util.Preconditions.checkNotNull;
19
20import android.text.method.LinkMovementMethod;
21import android.view.LayoutInflater;
22import android.view.View;
23import android.view.ViewGroup;
24import android.view.accessibility.AccessibilityNodeInfo;
25import android.widget.BaseExpandableListAdapter;
26import android.widget.ImageView;
27import android.widget.TextView;
28
29import com.android.managedprovisioning.R;
30import com.android.managedprovisioning.common.HtmlToSpannedParser;
31
32import java.util.List;
33
34/**
35 * Allows for displaying {@link TermsDocument} objects in an
36 * {@link android.widget.ExpandableListView}.
37 */
38class TermsListAdapter extends BaseExpandableListAdapter {
39    private final List<TermsDocument> mTermsDocuments;
40    private final LayoutInflater mInflater;
41    private final HtmlToSpannedParser mHtmlToSpannedParser;
42    private final GroupExpandedInfo mGroupExpandedInfo;
43
44    /**
45     * Creates a new instance of the class.
46     */
47    TermsListAdapter(List<TermsDocument> termsDocuments, LayoutInflater layoutInflater,
48            HtmlToSpannedParser htmlToSpannedParser, GroupExpandedInfo groupExpandedInfo) {
49        mTermsDocuments = checkNotNull(termsDocuments);
50        mInflater = checkNotNull(layoutInflater);
51        mHtmlToSpannedParser = checkNotNull(htmlToSpannedParser);
52        mGroupExpandedInfo = checkNotNull(groupExpandedInfo);
53    }
54
55    @Override
56    public int getGroupCount() {
57        return mTermsDocuments.size();
58    }
59
60    @Override
61    public int getChildrenCount(int groupPosition) {
62        return 1; // one content piece per header
63    }
64
65    @Override
66    public TermsDocument getGroup(int groupPosition) {
67        return getDisclaimer(groupPosition);
68    }
69
70    @Override
71    public TermsDocument getChild(int groupPosition, int childPosition) {
72        return getDisclaimer(groupPosition);
73    }
74
75    @Override
76    public long getGroupId(int groupPosition) {
77        return groupPosition;
78    }
79
80    @Override
81    public long getChildId(int groupPosition, int childPosition) {
82        return childPosition;
83    }
84
85    @Override
86    public boolean hasStableIds() {
87        return true;
88    }
89
90    // TODO: encapsulate this logic - too much direct view manipulation
91    @Override
92    public View getGroupView(int groupPosition, boolean isExpanded, View convertView,
93            ViewGroup parent) {
94        String heading = getDisclaimer(groupPosition).getHeading();
95
96        View groupView = convertView != null ? convertView : mInflater.inflate(
97                R.layout.terms_disclaimer_header, parent, false);
98        groupView.setContentDescription(
99                parent.getResources().getString(R.string.section_heading, heading));
100        groupView.setAccessibilityDelegate(new View.AccessibilityDelegate() {
101            @Override public void onInitializeAccessibilityNodeInfo(View host,
102                    AccessibilityNodeInfo info) {
103                super.onInitializeAccessibilityNodeInfo(host, info);
104                info.addAction(new AccessibilityNodeInfo.AccessibilityAction(
105                        AccessibilityNodeInfo.AccessibilityAction.ACTION_CLICK.getId(),
106                        parent.getResources().getString(
107                                isExpanded ? R.string.collapse : R.string.expand)));
108            }
109        });
110
111        TextView textView = groupView.findViewById(R.id.header_text);
112        textView.setText(heading);
113
114        ImageView chevron = groupView.findViewById(R.id.chevron);
115        chevron.setRotation(isExpanded ? 90 : -90); // chevron down / up retrospectively
116        groupView.findViewById(R.id.divider).setVisibility(
117                shouldShowGroupDivider(groupPosition) ? View.VISIBLE : View.INVISIBLE);
118
119        return groupView;
120    }
121
122    /**
123     * Helps avoid a double thick divider line: one above header, one from the bottom of prev child
124     */
125    private boolean shouldShowGroupDivider(int groupPosition) {
126        return mGroupExpandedInfo.isGroupExpanded(groupPosition)
127                && (groupPosition == 0 || !mGroupExpandedInfo.isGroupExpanded(groupPosition - 1));
128    }
129
130    // TODO: encapsulate this logic - too much direct view manipulation
131    @Override
132    public View getChildView(int groupPosition, int childPosition, boolean isLastChild,
133            View convertView, ViewGroup parent) {
134        View view = convertView != null ? convertView : mInflater.inflate(
135                R.layout.terms_disclaimer_content, parent, false);
136
137        TermsDocument disclaimer = getDisclaimer(groupPosition);
138        TextView textView = view.findViewById(R.id.disclaimer_content);
139        textView.setText(mHtmlToSpannedParser.parseHtml(disclaimer.getContent()));
140        textView.setContentDescription(
141                parent.getResources().getString(R.string.section_content, disclaimer.getHeading(),
142                        disclaimer.getContent()));
143        textView.setMovementMethod(LinkMovementMethod.getInstance()); // makes html links clickable
144
145        return view;
146    }
147
148    private TermsDocument getDisclaimer(int index) {
149        return mTermsDocuments.get(index);
150    }
151
152    @Override
153    public boolean isChildSelectable(int groupPosition, int childPosition) {
154        return false;
155    }
156
157    interface GroupExpandedInfo {
158        boolean isGroupExpanded(int groupPosition);
159    }
160}