1 /* 2 * Copyright (C) 2011 Google Inc. 3 * Licensed to The Android Open Source Project. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package com.android.ex.photo.adapters; 19 20 import android.content.Context; 21 import android.content.Intent; 22 import android.database.Cursor; 23 import android.support.v4.app.Fragment; 24 import android.support.v4.util.SimpleArrayMap; 25 26 import com.android.ex.photo.Intents; 27 import com.android.ex.photo.Intents.PhotoViewIntentBuilder; 28 import com.android.ex.photo.fragments.PhotoViewFragment; 29 import com.android.ex.photo.provider.PhotoContract.PhotoViewColumns; 30 import com.android.ex.photo.provider.PhotoContract.PhotoQuery; 31 32 /** 33 * Pager adapter for the photo view 34 */ 35 public class PhotoPagerAdapter extends BaseCursorPagerAdapter { 36 protected SimpleArrayMap<String, Integer> mColumnIndices = 37 new SimpleArrayMap<String, Integer>(PhotoQuery.PROJECTION.length); 38 protected final float mMaxScale; 39 protected boolean mDisplayThumbsFullScreen; 40 PhotoPagerAdapter( Context context, android.support.v4.app.FragmentManager fm, Cursor c, float maxScale, boolean thumbsFullScreen)41 public PhotoPagerAdapter( 42 Context context, android.support.v4.app.FragmentManager fm, Cursor c, 43 float maxScale, boolean thumbsFullScreen) { 44 super(context, fm, c); 45 mMaxScale = maxScale; 46 mDisplayThumbsFullScreen = thumbsFullScreen; 47 } 48 49 @Override getItem(Context context, Cursor cursor, int position)50 public Fragment getItem(Context context, Cursor cursor, int position) { 51 final String photoUri = getPhotoUri(cursor); 52 final String thumbnailUri = getThumbnailUri(cursor); 53 boolean loading = shouldShowLoadingIndicator(cursor); 54 boolean onlyShowSpinner = false; 55 if(photoUri == null && loading) { 56 onlyShowSpinner = true; 57 } 58 59 // create new PhotoViewFragment 60 final PhotoViewIntentBuilder builder = 61 Intents.newPhotoViewFragmentIntentBuilder(mContext, getPhotoViewFragmentClass()); 62 builder 63 .setResolvedPhotoUri(photoUri) 64 .setThumbnailUri(thumbnailUri) 65 .setDisplayThumbsFullScreen(mDisplayThumbsFullScreen) 66 .setMaxInitialScale(mMaxScale); 67 68 return createPhotoViewFragment(builder.build(), position, onlyShowSpinner); 69 } 70 getPhotoViewFragmentClass()71 protected Class<? extends PhotoViewFragment> getPhotoViewFragmentClass() { 72 return PhotoViewFragment.class; 73 } 74 createPhotoViewFragment( Intent intent, int position, boolean onlyShowSpinner)75 protected PhotoViewFragment createPhotoViewFragment( 76 Intent intent, int position, boolean onlyShowSpinner) { 77 return PhotoViewFragment.newInstance(intent, position, onlyShowSpinner); 78 } 79 80 @Override swapCursor(Cursor newCursor)81 public Cursor swapCursor(Cursor newCursor) { 82 mColumnIndices.clear(); 83 84 if (newCursor != null) { 85 for(String column : PhotoQuery.PROJECTION) { 86 mColumnIndices.put(column, newCursor.getColumnIndexOrThrow(column)); 87 } 88 89 for(String column : PhotoQuery.OPTIONAL_COLUMNS) { 90 int index = newCursor.getColumnIndex(column); 91 if (index != -1) { 92 mColumnIndices.put(column, index); 93 } 94 } 95 } 96 97 return super.swapCursor(newCursor); 98 } 99 getPhotoUri(Cursor cursor)100 public String getPhotoUri(Cursor cursor) { 101 return getString(cursor, PhotoViewColumns.CONTENT_URI); 102 } 103 getThumbnailUri(Cursor cursor)104 public String getThumbnailUri(Cursor cursor) { 105 return getString(cursor, PhotoViewColumns.THUMBNAIL_URI); 106 } 107 getContentType(Cursor cursor)108 public String getContentType(Cursor cursor) { 109 return getString(cursor, PhotoViewColumns.CONTENT_TYPE); 110 } 111 shouldShowLoadingIndicator(Cursor cursor)112 public boolean shouldShowLoadingIndicator(Cursor cursor) { 113 String value = getString(cursor, PhotoViewColumns.LOADING_INDICATOR); 114 if (value == null) { 115 return false; 116 } else { 117 return Boolean.valueOf(value); 118 } 119 } 120 getString(Cursor cursor, String column)121 private String getString(Cursor cursor, String column) { 122 if (mColumnIndices.containsKey(column)) { 123 return cursor.getString(mColumnIndices.get(column)); 124 } else { 125 return null; 126 } 127 } 128 } 129