/documentation/RockLockTutorial/RockLock_00/src/com/marvin/rocklock/TagStructuredSongPicker.java
Java | 435 lines | 382 code | 32 blank | 21 comment | 94 complexity | 794ae78d14fc0457d86e8d47e83b57a5 MD5 | raw file
1/* 2 * Copyright (C) 2010 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not 5 * use this file except in compliance with the License. You may obtain a copy of 6 * 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, WITHOUT 12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 13 * License for the specific language governing permissions and limitations under 14 * the License. 15 */ 16 17package com.marvin.rocklock; 18 19import android.app.Activity; 20import android.content.SharedPreferences; 21import android.content.SharedPreferences.Editor; 22import android.database.Cursor; 23import android.preference.PreferenceManager; 24import android.provider.MediaStore; 25import android.provider.MediaStore.MediaColumns; 26import android.provider.MediaStore.Audio.AudioColumns; 27import android.util.Log; 28 29/** 30 * SongPicker implementation that uses the tags in the music files to organize 31 * the music. 32 * 33 * @author clchen@google.com (Charles L. Chen) 34 */ 35public class TagStructuredSongPicker implements SongPicker { 36 private static final String PREF_ARTIST = "TAG_ARTIST"; 37 38 private static final String PREF_ALBUM = "TAG_ALBUM"; 39 40 private static final String PREF_TRACK = "TAG_TRACK"; 41 42 private static final int ARTIST = 0; 43 44 private static final int ALBUM = 1; 45 46 private static final int TRACK = 2; 47 48 private static final int FILEPATH = 3; 49 50 private Cursor musicCursor; 51 52 private String currentArtist = ""; 53 54 private String currentAlbum = ""; 55 56 private String currentTrack = ""; 57 58 private Editor editor; 59 60 private boolean taggedMusicAvailable = true; 61 62 public TagStructuredSongPicker(Activity parentActivity) { 63 SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(parentActivity); 64 editor = prefs.edit(); 65 66 String[] proj = { 67 AudioColumns.ARTIST, AudioColumns.ALBUM, MediaColumns.TITLE, MediaColumns.DATA 68 }; 69 taggedMusicAvailable = true; 70 musicCursor = parentActivity.managedQuery(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, 71 proj, null, null, null); 72 if (musicCursor == null) { 73 taggedMusicAvailable = false; 74 return; 75 } 76 taggedMusicAvailable = musicCursor.moveToFirst(); 77 if (!taggedMusicAvailable) { 78 return; 79 } 80 if (!restoreFromPrefs(prefs)) { 81 musicCursor.moveToFirst(); 82 currentArtist = musicCursor.getString(ARTIST); 83 currentAlbum = musicCursor.getString(ALBUM); 84 currentTrack = musicCursor.getString(TRACK); 85 } 86 } 87 88 private boolean restoreFromPrefs(SharedPreferences prefs) { 89 musicCursor.moveToFirst(); 90 currentArtist = prefs.getString(PREF_ARTIST, ""); 91 currentAlbum = prefs.getString(PREF_ALBUM, ""); 92 currentTrack = prefs.getString(PREF_TRACK, ""); 93 while (musicCursor.moveToNext()) { 94 if (musicCursor.getString(ARTIST).equals(currentArtist) 95 && musicCursor.getString(ALBUM).equals(currentAlbum) 96 && musicCursor.getString(TRACK).equals(currentTrack)) { 97 return true; 98 } 99 } 100 return false; 101 } 102 103 public String peekNextArtist() { 104 if (!taggedMusicAvailable) { 105 return ""; 106 } 107 int initialPosition = musicCursor.getPosition(); 108 while (musicCursor.moveToNext()) { 109 if (!musicCursor.getString(ARTIST).equals(currentArtist)) { 110 String artist = musicCursor.getString(ARTIST); 111 musicCursor.moveToPosition(initialPosition); 112 return artist; 113 } 114 } 115 musicCursor.moveToFirst(); 116 while (musicCursor.getPosition() < initialPosition) { 117 if (!musicCursor.getString(ARTIST).equals(currentArtist)) { 118 String artist = musicCursor.getString(ARTIST); 119 musicCursor.moveToPosition(initialPosition); 120 return artist; 121 } 122 musicCursor.moveToNext(); 123 } 124 return musicCursor.getString(ARTIST); 125 } 126 127 public String goNextArtist() { 128 if (!taggedMusicAvailable) { 129 return ""; 130 } 131 int initialPosition = musicCursor.getPosition(); 132 while (musicCursor.moveToNext()) { 133 if (!musicCursor.getString(ARTIST).equals(currentArtist)) { 134 currentArtist = musicCursor.getString(ARTIST); 135 return currentArtist; 136 } 137 } 138 musicCursor.moveToFirst(); 139 while (musicCursor.getPosition() < initialPosition) { 140 if (!musicCursor.getString(ARTIST).equals(currentArtist)) { 141 currentArtist = musicCursor.getString(ARTIST); 142 return currentArtist; 143 } 144 musicCursor.moveToNext(); 145 } 146 currentArtist = musicCursor.getString(ARTIST); 147 return currentArtist; 148 } 149 150 public String peekPrevArtist() { 151 if (!taggedMusicAvailable) { 152 return ""; 153 } 154 int initialPosition = musicCursor.getPosition(); 155 while (musicCursor.moveToPrevious()) { 156 if (!musicCursor.getString(ARTIST).equals(currentArtist)) { 157 String artist = musicCursor.getString(ARTIST); 158 musicCursor.moveToPosition(initialPosition); 159 return artist; 160 } 161 } 162 musicCursor.moveToLast(); 163 while (musicCursor.getPosition() > initialPosition) { 164 if (!musicCursor.getString(ARTIST).equals(currentArtist)) { 165 String artist = musicCursor.getString(ARTIST); 166 musicCursor.moveToPosition(initialPosition); 167 return artist; 168 } 169 musicCursor.moveToPrevious(); 170 } 171 return musicCursor.getString(ARTIST); 172 } 173 174 public String goPrevArtist() { 175 if (!taggedMusicAvailable) { 176 return ""; 177 } 178 int initialPosition = musicCursor.getPosition(); 179 while (musicCursor.moveToPrevious()) { 180 if (!musicCursor.getString(ARTIST).equals(currentArtist)) { 181 currentArtist = musicCursor.getString(ARTIST); 182 return currentArtist; 183 } 184 } 185 musicCursor.moveToLast(); 186 while (musicCursor.getPosition() > initialPosition) { 187 if (!musicCursor.getString(ARTIST).equals(currentArtist)) { 188 currentArtist = musicCursor.getString(ARTIST); 189 return currentArtist; 190 } 191 musicCursor.moveToPrevious(); 192 } 193 currentArtist = musicCursor.getString(ARTIST); 194 return currentArtist; 195 } 196 197 public String peekNextAlbum() { 198 if (!taggedMusicAvailable) { 199 return ""; 200 } 201 int initialPosition = musicCursor.getPosition(); 202 while (musicCursor.moveToNext()) { 203 if (musicCursor.getString(ARTIST).equals(currentArtist) 204 && !musicCursor.getString(ALBUM).equals(currentAlbum)) { 205 String album = musicCursor.getString(ALBUM); 206 musicCursor.moveToPosition(initialPosition); 207 return album; 208 } 209 } 210 musicCursor.moveToFirst(); 211 while (musicCursor.getPosition() < initialPosition) { 212 if (musicCursor.getString(ARTIST).equals(currentArtist) 213 && !musicCursor.getString(ALBUM).equals(currentAlbum)) { 214 String album = musicCursor.getString(ALBUM); 215 musicCursor.moveToPosition(initialPosition); 216 return album; 217 } 218 musicCursor.moveToNext(); 219 } 220 return musicCursor.getString(ALBUM); 221 } 222 223 public String goNextAlbum() { 224 if (!taggedMusicAvailable) { 225 return ""; 226 } 227 int initialPosition = musicCursor.getPosition(); 228 while (musicCursor.moveToNext()) { 229 if (musicCursor.getString(ARTIST).equals(currentArtist) 230 && !musicCursor.getString(ALBUM).equals(currentAlbum)) { 231 currentAlbum = musicCursor.getString(ALBUM); 232 return currentAlbum; 233 } 234 } 235 musicCursor.moveToFirst(); 236 while (musicCursor.getPosition() < initialPosition) { 237 if (musicCursor.getString(ARTIST).equals(currentArtist) 238 && !musicCursor.getString(ALBUM).equals(currentAlbum)) { 239 currentAlbum = musicCursor.getString(ALBUM); 240 return currentAlbum; 241 } 242 musicCursor.moveToNext(); 243 } 244 currentAlbum = musicCursor.getString(ALBUM); 245 return currentAlbum; 246 } 247 248 public String peekPrevAlbum() { 249 if (!taggedMusicAvailable) { 250 return ""; 251 } 252 int initialPosition = musicCursor.getPosition(); 253 while (musicCursor.moveToPrevious()) { 254 if (musicCursor.getString(ARTIST).equals(currentArtist) 255 && !musicCursor.getString(ALBUM).equals(currentAlbum)) { 256 String album = musicCursor.getString(ALBUM); 257 musicCursor.moveToPosition(initialPosition); 258 return album; 259 } 260 } 261 musicCursor.moveToLast(); 262 while (musicCursor.getPosition() > initialPosition) { 263 if (musicCursor.getString(ARTIST).equals(currentArtist) 264 && !musicCursor.getString(ALBUM).equals(currentAlbum)) { 265 String album = musicCursor.getString(ALBUM); 266 musicCursor.moveToPosition(initialPosition); 267 return album; 268 } 269 musicCursor.moveToPrevious(); 270 } 271 return musicCursor.getString(ALBUM); 272 } 273 274 public String goPrevAlbum() { 275 if (!taggedMusicAvailable) { 276 return ""; 277 } 278 int initialPosition = musicCursor.getPosition(); 279 while (musicCursor.moveToPrevious()) { 280 if (musicCursor.getString(ARTIST).equals(currentArtist) 281 && !musicCursor.getString(ALBUM).equals(currentAlbum)) { 282 currentAlbum = musicCursor.getString(ALBUM); 283 return currentAlbum; 284 } 285 } 286 musicCursor.moveToLast(); 287 while (musicCursor.getPosition() > initialPosition) { 288 if (musicCursor.getString(ARTIST).equals(currentArtist) 289 && !musicCursor.getString(ALBUM).equals(currentAlbum)) { 290 currentAlbum = musicCursor.getString(ALBUM); 291 return currentAlbum; 292 } 293 musicCursor.moveToPrevious(); 294 } 295 currentAlbum = musicCursor.getString(ALBUM); 296 return currentAlbum; 297 } 298 299 public String peekNextTrack() { 300 if (!taggedMusicAvailable) { 301 return ""; 302 } 303 int initialPosition = musicCursor.getPosition(); 304 while (musicCursor.moveToNext()) { 305 if (musicCursor.getString(ARTIST).equals(currentArtist) 306 && musicCursor.getString(ALBUM).equals(currentAlbum) 307 && !musicCursor.getString(TRACK).equals(currentTrack)) { 308 String track = musicCursor.getString(TRACK); 309 musicCursor.moveToPosition(initialPosition); 310 Log.e("peek end 0", musicCursor.getPosition() + " " + getCurrentSongInfo()); 311 return track; 312 } 313 } 314 musicCursor.moveToFirst(); 315 while (musicCursor.getPosition() < initialPosition) { 316 if (musicCursor.getString(ARTIST).equals(currentArtist) 317 && musicCursor.getString(ALBUM).equals(currentAlbum) 318 && !musicCursor.getString(TRACK).equals(currentTrack)) { 319 String track = musicCursor.getString(TRACK); 320 musicCursor.moveToPosition(initialPosition); 321 Log.e("peek end 1", musicCursor.getPosition() + " " + getCurrentSongInfo()); 322 return track; 323 } 324 musicCursor.moveToNext(); 325 } 326 Log.e("peek end 2", musicCursor.getPosition() + " " + getCurrentSongInfo()); 327 return musicCursor.getString(TRACK); 328 } 329 330 public String goNextTrack() { 331 if (!taggedMusicAvailable) { 332 return ""; 333 } 334 int initialPosition = musicCursor.getPosition(); 335 while (musicCursor.moveToNext()) { 336 if (musicCursor.getString(ARTIST).equals(currentArtist) 337 && musicCursor.getString(ALBUM).equals(currentAlbum) 338 && !musicCursor.getString(TRACK).equals(currentTrack)) { 339 currentTrack = musicCursor.getString(TRACK); 340 return currentTrack; 341 } 342 } 343 musicCursor.moveToFirst(); 344 while (musicCursor.getPosition() < initialPosition) { 345 if (musicCursor.getString(ARTIST).equals(currentArtist) 346 && musicCursor.getString(ALBUM).equals(currentAlbum) 347 && !musicCursor.getString(TRACK).equals(currentTrack)) { 348 currentTrack = musicCursor.getString(TRACK); 349 return currentTrack; 350 } 351 musicCursor.moveToNext(); 352 } 353 currentTrack = musicCursor.getString(TRACK); 354 return currentTrack; 355 } 356 357 public String peekPrevTrack() { 358 if (!taggedMusicAvailable) { 359 return ""; 360 } 361 int initialPosition = musicCursor.getPosition(); 362 while (musicCursor.moveToPrevious()) { 363 if (musicCursor.getString(ARTIST).equals(currentArtist) 364 && musicCursor.getString(ALBUM).equals(currentAlbum) 365 && !musicCursor.getString(TRACK).equals(currentTrack)) { 366 String track = musicCursor.getString(TRACK); 367 musicCursor.moveToPosition(initialPosition); 368 return track; 369 } 370 } 371 musicCursor.moveToLast(); 372 while (musicCursor.getPosition() > initialPosition) { 373 if (musicCursor.getString(ARTIST).equals(currentArtist) 374 && musicCursor.getString(ALBUM).equals(currentAlbum) 375 && !musicCursor.getString(TRACK).equals(currentTrack)) { 376 String track = musicCursor.getString(TRACK); 377 musicCursor.moveToPosition(initialPosition); 378 return track; 379 } 380 musicCursor.moveToPrevious(); 381 } 382 return musicCursor.getString(TRACK); 383 } 384 385 public String goPrevTrack() { 386 if (!taggedMusicAvailable) { 387 return ""; 388 } 389 int initialPosition = musicCursor.getPosition(); 390 while (musicCursor.moveToPrevious()) { 391 if (musicCursor.getString(ARTIST).equals(currentArtist) 392 && musicCursor.getString(ALBUM).equals(currentAlbum) 393 && !musicCursor.getString(TRACK).equals(currentTrack)) { 394 currentTrack = musicCursor.getString(TRACK); 395 return currentTrack; 396 } 397 } 398 musicCursor.moveToLast(); 399 while (musicCursor.getPosition() > initialPosition) { 400 if (musicCursor.getString(ARTIST).equals(currentArtist) 401 && musicCursor.getString(ALBUM).equals(currentAlbum) 402 && !musicCursor.getString(TRACK).equals(currentTrack)) { 403 currentTrack = musicCursor.getString(TRACK); 404 return currentTrack; 405 } 406 musicCursor.moveToPrevious(); 407 } 408 currentTrack = musicCursor.getString(TRACK); 409 return currentTrack; 410 } 411 412 public String getCurrentSongFile() { 413 if (!taggedMusicAvailable) { 414 return ""; 415 } 416 currentArtist = musicCursor.getString(ARTIST); 417 currentAlbum = musicCursor.getString(ALBUM); 418 currentTrack = musicCursor.getString(TRACK); 419 editor.putString(PREF_ARTIST, currentArtist); 420 editor.putString(PREF_ALBUM, currentAlbum); 421 editor.putString(PREF_TRACK, currentTrack); 422 editor.commit(); 423 return musicCursor.getString(FILEPATH); 424 } 425 426 public String getCurrentSongInfo() { 427 if (!taggedMusicAvailable) { 428 return ""; 429 } 430 currentArtist = musicCursor.getString(ARTIST); 431 currentAlbum = musicCursor.getString(ALBUM); 432 currentTrack = musicCursor.getString(TRACK); 433 return currentArtist + " - " + currentAlbum + " - " + currentTrack; 434 } 435}