1 package com.example.photoviewersample; 2 3 import android.content.ContentProvider; 4 import android.content.ContentValues; 5 import android.content.UriMatcher; 6 import android.content.res.AssetFileDescriptor; 7 import android.database.Cursor; 8 import android.database.MatrixCursor; 9 import android.net.Uri; 10 11 import java.io.FileNotFoundException; 12 import java.io.IOException; 13 import java.util.List; 14 15 public class SampleProvider extends ContentProvider { 16 private static final int PHOTOS = 1; 17 private static final int PHOTO_INDIVIDUAL_1 = 2; 18 private static final int PHOTO_INDIVIDUAL_2 = 3; 19 private static final int PHOTO_INDIVIDUAL_3 = 4; 20 private static final int PHOTO_INDIVIDUAL_4 = 5; 21 22 private static final String PROVIDER_URI = "com.example.photoviewersample.SampleProvider"; 23 24 // Creates a UriMatcher object. 25 private static final UriMatcher sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH); 26 27 static 28 { 29 sUriMatcher.addURI(PROVIDER_URI, "photos", PHOTOS); 30 sUriMatcher.addURI(PROVIDER_URI, "photos/1", PHOTO_INDIVIDUAL_1); 31 sUriMatcher.addURI(PROVIDER_URI, "photos/2", PHOTO_INDIVIDUAL_2); 32 sUriMatcher.addURI(PROVIDER_URI, "photos/3", PHOTO_INDIVIDUAL_3); 33 sUriMatcher.addURI(PROVIDER_URI, "photos/4", PHOTO_INDIVIDUAL_4); 34 } 35 36 @Override 37 public int delete(Uri uri, String selection, String[] selectionArgs) { 38 // TODO Auto-generated method stub 39 return 0; 40 } 41 42 @Override 43 public String getType(Uri uri) { 44 // TODO Auto-generated method stub 45 return null; 46 } 47 48 @Override 49 public Uri insert(Uri uri, ContentValues values) { 50 // TODO Auto-generated method stub 51 return null; 52 } 53 54 @Override 55 public boolean onCreate() { 56 // TODO Auto-generated method stub 57 return false; 58 } 59 60 @Override 61 public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, 62 String sortOrder) { 63 MatrixCursor matrix = new MatrixCursor(projection); 64 65 /* 66 * Choose the table to query and a sort order based on the code returned for the incoming 67 * URI. Here, too, only the statements for table 3 are shown. 68 */ 69 switch (sUriMatcher.match(uri)) { 70 // If the incoming URI was for all of the photos table 71 case PHOTOS: 72 addRow(matrix, PHOTO_INDIVIDUAL_1); 73 addRow(matrix, PHOTO_INDIVIDUAL_2); 74 addRow(matrix, PHOTO_INDIVIDUAL_3); 75 addRow(matrix, PHOTO_INDIVIDUAL_4); 76 break; 77 78 // If the incoming URI was for a single row 79 case PHOTO_INDIVIDUAL_1: 80 addRow(matrix, PHOTO_INDIVIDUAL_1); 81 break; 82 case PHOTO_INDIVIDUAL_2: 83 addRow(matrix, PHOTO_INDIVIDUAL_2); 84 break; 85 case PHOTO_INDIVIDUAL_3: 86 addRow(matrix, PHOTO_INDIVIDUAL_3); 87 break; 88 case PHOTO_INDIVIDUAL_4: 89 addRow(matrix, PHOTO_INDIVIDUAL_4); 90 break; 91 92 default: 93 // If the URI is not recognized, you should do some error handling here. 94 } 95 // call the code to actually do the query 96 97 return matrix; 98 } 99 100 /** 101 * Adds a single row to the Cursor. A real implementation should 102 * check the projection to properly match the columns. 103 */ 104 private void addRow(MatrixCursor matrix, int match_id) { 105 switch (match_id) { 106 case PHOTO_INDIVIDUAL_1: 107 matrix.newRow() 108 .add("content://" + PROVIDER_URI + "/photos/1") // uri 109 .add("blah.png") // displayName 110 .add("content://" + PROVIDER_URI + "/photos/1/contentUri") // contentUri 111 .add("content://" + PROVIDER_URI + "/photos/1/thumbnailUri") // thumbnailUri 112 .add("image/png"); // contentType 113 break; 114 case PHOTO_INDIVIDUAL_2: 115 matrix.newRow() 116 .add("content://" + PROVIDER_URI + "/photos/2") // uri 117 .add("johannson.png") // displayName 118 .add("content://" + PROVIDER_URI + "/photos/2/contentUri") // contentUri 119 .add("content://" + PROVIDER_URI + "/photos/2/thumbnailUri") // thumbnailUri 120 .add("image/png"); // contentType 121 break; 122 case PHOTO_INDIVIDUAL_3: 123 matrix.newRow() 124 .add("content://" + PROVIDER_URI + "/photos/3") // uri 125 .add("planets.png") // displayName 126 .add("content://" + PROVIDER_URI + "/photos/3/contentUri") // contentUri 127 .add("content://" + PROVIDER_URI + "/photos/3/thumbnailUri") // thumbnailUri 128 .add("image/png"); // contentType 129 break; 130 case PHOTO_INDIVIDUAL_4: 131 matrix.newRow() 132 .add("content://" + PROVIDER_URI + "/photos/4") // uri 133 .add("galaxy.png") // displayName 134 .add("content://" + PROVIDER_URI + "/photos/4/contentUri") // contentUri 135 .add("content://" + PROVIDER_URI + "/photos/4/thumbnailUri") // thumbnailUri 136 .add("image/png"); // contentType 137 break; 138 139 default: 140 // If the URI is not recognized, you should do some error handling here. 141 } 142 } 143 144 @Override 145 public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { 146 // TODO Auto-generated method stub 147 return 0; 148 } 149 150 @Override 151 public AssetFileDescriptor openAssetFile(Uri uri, String mode) throws FileNotFoundException { 152 List<String> pathSegments = uri.getPathSegments(); 153 final int id = Integer.parseInt(pathSegments.get(1)); 154 String fileName; 155 switch (id) { 156 case 1: 157 fileName = "blah.png"; 158 break; 159 case 2: 160 fileName = "johannson.png"; 161 break; 162 case 3: 163 fileName = "planets.png"; 164 break; 165 case 4: 166 fileName = "galaxy.png"; 167 break; 168 default: 169 fileName = null; 170 break; 171 } 172 try { 173 return getContext().getAssets().openFd(fileName); 174 } catch (IOException e) { 175 e.printStackTrace(); 176 return null; 177 } 178 } 179 } 180
