| /* |
| * 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.TAG; |
| 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 int MAX_CLIP_ITEMS = 1000; |
| |
| 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); |
| } |
| } |
| |
| intent.putExtra(Intent.EXTRA_INDEX, documentLocation); |
| 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 List<String> siblingIds = mModel.getModelIds(); |
| uris.ensureCapacity(siblingIds.size()); |
| |
| 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.size(); i++) { |
| cursor = mModel.getItem(siblingIds.get(i)); |
| |
| mimeType = getCursorString(cursor, Document.COLUMN_MIME_TYPE); |
| if (Document.MIME_TYPE_DIR.equals(mimeType)) { |
| continue; |
| } |
| |
| id = getCursorString(cursor, Document.COLUMN_DOCUMENT_ID); |
| authority = getCursorString(cursor, RootCursorWrapper.COLUMN_AUTHORITY); |
| uri = DocumentsContract.buildDocumentUri(authority, id); |
| |
| if (id.equals(mDocument.documentId)) { |
| if (DEBUG) Log.d(TAG, "Found starting point for QV. " + i); |
| documentLocation = i; |
| } |
| |
| uris.add(uri); |
| } |
| |
| 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_CLIP_ITEMS / 2); |
| lastSibling = Math.min(uris.size() - 1, firstSibling + MAX_CLIP_ITEMS - 1); |
| } else { |
| lastSibling = Math.min(uris.size() - 1, documentLocation + MAX_CLIP_ITEMS / 2); |
| firstSibling = Math.max(0, lastSibling - MAX_CLIP_ITEMS + 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; |
| } |
| } |