1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/*
* Copyright (C) 2015 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.documentsui;
import static com.android.documentsui.Shared.DEBUG;
import static com.android.documentsui.Shared.MAX_DOCS_IN_INTENT;
import static com.android.documentsui.model.DocumentInfo.getCursorString;
import android.content.ClipData;
import android.content.ClipDescription;
import android.content.ComponentName;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.database.Cursor;
import android.net.Uri;
import android.provider.DocumentsContract;
import android.provider.DocumentsContract.Document;
import android.support.annotation.Nullable;
import android.text.TextUtils;
import android.util.Log;
import android.util.Range;
import com.android.documentsui.dirlist.Model;
import com.android.documentsui.model.DocumentInfo;
import java.util.ArrayList;
import java.util.List;
/**
* Provides support for gather a list of quick-viewable files into a quick view intent.
*/
final class QuickViewIntentBuilder {
private static final String TAG = "QuickViewIntentBuilder";
private final DocumentInfo mDocument;
private final Model mModel;
private final PackageManager mPkgManager;
private final Resources mResources;
public QuickViewIntentBuilder(
PackageManager pkgManager,
Resources resources,
DocumentInfo doc,
Model model) {
mPkgManager = pkgManager;
mResources = resources;
mDocument = doc;
mModel = model;
}
/**
* Builds the intent for quick viewing. Short circuits building if a handler cannot
* be resolved; in this case {@code null} is returned.
*/
@Nullable Intent build() {
if (DEBUG) Log.d(TAG, "Preparing intent for doc:" + mDocument.documentId);
String trustedPkg = mResources.getString(R.string.trusted_quick_viewer_package);
if (!TextUtils.isEmpty(trustedPkg)) {
Intent intent = new Intent(Intent.ACTION_QUICK_VIEW);
intent.setDataAndType(mDocument.derivedUri, mDocument.mimeType);
intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
intent.setPackage(trustedPkg);
if (hasRegisteredHandler(intent)) {
final ArrayList<Uri> uris = new ArrayList<Uri>();
final int documentLocation = collectViewableUris(uris);
final Range<Integer> range = computeSiblingsRange(uris, documentLocation);
ClipData clipData = null;
ClipData.Item item;
Uri uri;
for (int i = range.getLower(); i <= range.getUpper(); i++) {
uri = uris.get(i);
item = new ClipData.Item(uri);
if (DEBUG) Log.d(TAG, "Including file: " + uri);
if (clipData == null) {
clipData = new ClipData(
"URIs", new String[] { ClipDescription.MIMETYPE_TEXT_URILIST },
item);
} else {
clipData.addItem(item);
}
}
// The documentLocation variable contains an index in "uris". However,
// ClipData contains a slice of "uris", so we need to shift the location
// so it points to the same Uri.
intent.putExtra(Intent.EXTRA_INDEX, documentLocation - range.getLower());
intent.setClipData(clipData);
return intent;
} else {
Log.e(TAG, "Can't resolve trusted quick view package: " + trustedPkg);
}
}
return null;
}
private int collectViewableUris(ArrayList<Uri> uris) {
final String[] siblingIds = mModel.getModelIds();
uris.ensureCapacity(siblingIds.length);
int documentLocation = 0;
Cursor cursor;
String mimeType;
String id;
String authority;
Uri uri;
// Cursor's are not guaranteed to be immutable. Hence, traverse it only once.
for (int i = 0; i < siblingIds.length; i++) {
cursor = mModel.getItem(siblingIds[i]);
if (cursor == null) {
if (DEBUG) Log.d(TAG,
"Unable to obtain cursor for sibling document, modelId: "
+ siblingIds[i]);
continue;
}
mimeType = getCursorString(cursor, Document.COLUMN_MIME_TYPE);
if (Document.MIME_TYPE_DIR.equals(mimeType)) {
if (DEBUG) Log.d(TAG,
"Skipping directory, not supported by quick view. modelId: "
+ siblingIds[i]);
continue;
}
id = getCursorString(cursor, Document.COLUMN_DOCUMENT_ID);
authority = getCursorString(cursor, RootCursorWrapper.COLUMN_AUTHORITY);
uri = DocumentsContract.buildDocumentUri(authority, id);
uris.add(uri);
if (id.equals(mDocument.documentId)) {
documentLocation = uris.size() - 1; // Position in "uris", not in the model.
if (DEBUG) Log.d(TAG, "Found starting point for QV. " + documentLocation);
}
}
return documentLocation;
}
private static Range<Integer> computeSiblingsRange(List<Uri> uris, int documentLocation) {
// Restrict number of siblings to avoid hitting the IPC limit.
// TODO: Remove this restriction once ClipData can hold an arbitrary number of
// items.
int firstSibling;
int lastSibling;
if (documentLocation < uris.size() / 2) {
firstSibling = Math.max(0, documentLocation - MAX_DOCS_IN_INTENT / 2);
lastSibling = Math.min(uris.size() - 1, firstSibling + MAX_DOCS_IN_INTENT - 1);
} else {
lastSibling = Math.min(uris.size() - 1, documentLocation + MAX_DOCS_IN_INTENT / 2);
firstSibling = Math.max(0, lastSibling - MAX_DOCS_IN_INTENT + 1);
}
if (DEBUG) Log.d(TAG, "Copmuted siblings from index: " + firstSibling
+ " to: " + lastSibling);
return new Range(firstSibling, lastSibling);
}
private boolean hasRegisteredHandler(Intent intent) {
// Try to resolve the intent. If a matching app isn't installed, it won't resolve.
return intent.resolveActivity(mPkgManager) != null;
}
}
|
