Util.java revision 4a12eec56ad1c5a7e89168b205363a3ced7e26b6
1/* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of 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, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package com.android.camera; 18 19import android.annotation.TargetApi; 20import android.app.Activity; 21import android.app.AlertDialog; 22import android.app.admin.DevicePolicyManager; 23import android.content.ActivityNotFoundException; 24import android.content.ContentResolver; 25import android.content.Context; 26import android.content.DialogInterface; 27import android.content.Intent; 28import android.graphics.Bitmap; 29import android.graphics.BitmapFactory; 30import android.graphics.Matrix; 31import android.graphics.Point; 32import android.graphics.Rect; 33import android.graphics.RectF; 34import android.hardware.Camera; 35import android.hardware.Camera.CameraInfo; 36import android.hardware.Camera.Parameters; 37import android.hardware.Camera.Size; 38import android.location.Location; 39import android.net.Uri; 40import android.os.Build; 41import android.os.ParcelFileDescriptor; 42import android.telephony.TelephonyManager; 43import android.util.DisplayMetrics; 44import android.util.FloatMath; 45import android.util.Log; 46import android.view.Display; 47import android.view.OrientationEventListener; 48import android.view.Surface; 49import android.view.View; 50import android.view.WindowManager; 51import android.view.animation.AlphaAnimation; 52import android.view.animation.Animation; 53 54import java.io.Closeable; 55import java.io.IOException; 56import java.lang.reflect.Method; 57import java.text.SimpleDateFormat; 58import java.util.Date; 59import java.util.List; 60import java.util.StringTokenizer; 61 62/** 63 * Collection of utility functions used in this package. 64 */ 65public class Util { 66 private static final String TAG = "Util"; 67 68 // Orientation hysteresis amount used in rounding, in degrees 69 public static final int ORIENTATION_HYSTERESIS = 5; 70 71 public static final String REVIEW_ACTION = "com.android.camera.action.REVIEW"; 72 73 // Private intent extras. Test only. 74 private static final String EXTRAS_CAMERA_FACING = 75 "android.intent.extras.CAMERA_FACING"; 76 77 private static float sPixelDensity = 1; 78 private static ImageFileNamer sImageFileNamer; 79 80 private Util() { 81 } 82 83 public static void initialize(Context context) { 84 DisplayMetrics metrics = new DisplayMetrics(); 85 WindowManager wm = (WindowManager) 86 context.getSystemService(Context.WINDOW_SERVICE); 87 wm.getDefaultDisplay().getMetrics(metrics); 88 sPixelDensity = metrics.density; 89 sImageFileNamer = new ImageFileNamer( 90 context.getString(R.string.image_file_name_format)); 91 } 92 93 public static int dpToPixel(int dp) { 94 return Math.round(sPixelDensity * dp); 95 } 96 97 // Rotates the bitmap by the specified degree. 98 // If a new bitmap is created, the original bitmap is recycled. 99 public static Bitmap rotate(Bitmap b, int degrees) { 100 return rotateAndMirror(b, degrees, false); 101 } 102 103 // Rotates and/or mirrors the bitmap. If a new bitmap is created, the 104 // original bitmap is recycled. 105 public static Bitmap rotateAndMirror(Bitmap b, int degrees, boolean mirror) { 106 if ((degrees != 0 || mirror) && b != null) { 107 Matrix m = new Matrix(); 108 // Mirror first. 109 // horizontal flip + rotation = -rotation + horizontal flip 110 if (mirror) { 111 m.postScale(-1, 1); 112 degrees = (degrees + 360) % 360; 113 if (degrees == 0 || degrees == 180) { 114 m.postTranslate(b.getWidth(), 0); 115 } else if (degrees == 90 || degrees == 270) { 116 m.postTranslate(b.getHeight(), 0); 117 } else { 118 throw new IllegalArgumentException("Invalid degrees=" + degrees); 119 } 120 } 121 if (degrees != 0) { 122 // clockwise 123 m.postRotate(degrees, 124 (float) b.getWidth() / 2, (float) b.getHeight() / 2); 125 } 126 127 try { 128 Bitmap b2 = Bitmap.createBitmap( 129 b, 0, 0, b.getWidth(), b.getHeight(), m, true); 130 if (b != b2) { 131 b.recycle(); 132 b = b2; 133 } 134 } catch (OutOfMemoryError ex) { 135 // We have no memory to rotate. Return the original bitmap. 136 } 137 } 138 return b; 139 } 140 141 /* 142 * Compute the sample size as a function of minSideLength 143 * and maxNumOfPixels. 144 * minSideLength is used to specify that minimal width or height of a 145 * bitmap. 146 * maxNumOfPixels is used to specify the maximal size in pixels that is 147 * tolerable in terms of memory usage. 148 * 149 * The function returns a sample size based on the constraints. 150 * Both size and minSideLength can be passed in as -1 151 * which indicates no care of the corresponding constraint. 152 * The functions prefers returning a sample size that 153 * generates a smaller bitmap, unless minSideLength = -1. 154 * 155 * Also, the function rounds up the sample size to a power of 2 or multiple 156 * of 8 because BitmapFactory only honors sample size this way. 157 * For example, BitmapFactory downsamples an image by 2 even though the 158 * request is 3. So we round up the sample size to avoid OOM. 159 */ 160 public static int computeSampleSize(BitmapFactory.Options options, 161 int minSideLength, int maxNumOfPixels) { 162 int initialSize = computeInitialSampleSize(options, minSideLength, 163 maxNumOfPixels); 164 165 int roundedSize; 166 if (initialSize <= 8) { 167 roundedSize = 1; 168 while (roundedSize < initialSize) { 169 roundedSize <<= 1; 170 } 171 } else { 172 roundedSize = (initialSize + 7) / 8 * 8; 173 } 174 175 return roundedSize; 176 } 177 178 private static int computeInitialSampleSize(BitmapFactory.Options options, 179 int minSideLength, int maxNumOfPixels) { 180 double w = options.outWidth; 181 double h = options.outHeight; 182 183 int lowerBound = (maxNumOfPixels < 0) ? 1 : 184 (int) Math.ceil(Math.sqrt(w * h / maxNumOfPixels)); 185 int upperBound = (minSideLength < 0) ? 128 : 186 (int) Math.min(Math.floor(w / minSideLength), 187 Math.floor(h / minSideLength)); 188 189 if (upperBound < lowerBound) { 190 // return the larger one when there is no overlapping zone. 191 return lowerBound; 192 } 193 194 if (maxNumOfPixels < 0 && minSideLength < 0) { 195 return 1; 196 } else if (minSideLength < 0) { 197 return lowerBound; 198 } else { 199 return upperBound; 200 } 201 } 202 203 public static Bitmap makeBitmap(byte[] jpegData, int maxNumOfPixels) { 204 try { 205 BitmapFactory.Options options = new BitmapFactory.Options(); 206 options.inJustDecodeBounds = true; 207 BitmapFactory.decodeByteArray(jpegData, 0, jpegData.length, 208 options); 209 if (options.mCancel || options.outWidth == -1 210 || options.outHeight == -1) { 211 return null; 212 } 213 options.inSampleSize = computeSampleSize( 214 options, -1, maxNumOfPixels); 215 options.inJustDecodeBounds = false; 216 217 options.inDither = false; 218 options.inPreferredConfig = Bitmap.Config.ARGB_8888; 219 return BitmapFactory.decodeByteArray(jpegData, 0, jpegData.length, 220 options); 221 } catch (OutOfMemoryError ex) { 222 Log.e(TAG, "Got oom exception ", ex); 223 return null; 224 } 225 } 226 227 public static void closeSilently(Closeable c) { 228 if (c == null) return; 229 try { 230 c.close(); 231 } catch (Throwable t) { 232 // do nothing 233 } 234 } 235 236 public static void Assert(boolean cond) { 237 if (!cond) { 238 throw new AssertionError(); 239 } 240 } 241 242 public static CameraManager.CameraProxy openCamera(Activity activity, int cameraId) 243 throws CameraHardwareException, CameraDisabledException { 244 // Check if device policy has disabled the camera. 245 DevicePolicyManager dpm = (DevicePolicyManager) activity.getSystemService( 246 Context.DEVICE_POLICY_SERVICE); 247 if (dpm.getCameraDisabled(null)) { 248 throw new CameraDisabledException(); 249 } 250 251 try { 252 return CameraHolder.instance().open(cameraId); 253 } catch (CameraHardwareException e) { 254 // In eng build, we throw the exception so that test tool 255 // can detect it and report it 256 if ("eng".equals(Build.TYPE)) { 257 throw new RuntimeException("openCamera failed", e); 258 } else { 259 throw e; 260 } 261 } 262 } 263 264 public static void showErrorAndFinish(final Activity activity, int msgId) { 265 DialogInterface.OnClickListener buttonListener = 266 new DialogInterface.OnClickListener() { 267 @Override 268 public void onClick(DialogInterface dialog, int which) { 269 activity.finish(); 270 } 271 }; 272 new AlertDialog.Builder(activity) 273 .setCancelable(false) 274 .setIconAttribute(android.R.attr.alertDialogIcon) 275 .setTitle(R.string.camera_error_title) 276 .setMessage(msgId) 277 .setNeutralButton(R.string.dialog_ok, buttonListener) 278 .show(); 279 } 280 281 public static <T> T checkNotNull(T object) { 282 if (object == null) throw new NullPointerException(); 283 return object; 284 } 285 286 public static boolean equals(Object a, Object b) { 287 return (a == b) || (a == null ? false : a.equals(b)); 288 } 289 290 public static int nextPowerOf2(int n) { 291 n -= 1; 292 n |= n >>> 16; 293 n |= n >>> 8; 294 n |= n >>> 4; 295 n |= n >>> 2; 296 n |= n >>> 1; 297 return n + 1; 298 } 299 300 public static float distance(float x, float y, float sx, float sy) { 301 float dx = x - sx; 302 float dy = y - sy; 303 return FloatMath.sqrt(dx * dx + dy * dy); 304 } 305 306 public static int clamp(int x, int min, int max) { 307 if (x > max) return max; 308 if (x < min) return min; 309 return x; 310 } 311 312 public static int getDisplayRotation(Activity activity) { 313 int rotation = activity.getWindowManager().getDefaultDisplay() 314 .getRotation(); 315 switch (rotation) { 316 case Surface.ROTATION_0: return 0; 317 case Surface.ROTATION_90: return 90; 318 case Surface.ROTATION_180: return 180; 319 case Surface.ROTATION_270: return 270; 320 } 321 return 0; 322 } 323 324 public static int getDisplayOrientation(int degrees, int cameraId) { 325 // See android.hardware.Camera.setDisplayOrientation for 326 // documentation. 327 Camera.CameraInfo info = new Camera.CameraInfo(); 328 Camera.getCameraInfo(cameraId, info); 329 int result; 330 if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) { 331 result = (info.orientation + degrees) % 360; 332 result = (360 - result) % 360; // compensate the mirror 333 } else { // back-facing 334 result = (info.orientation - degrees + 360) % 360; 335 } 336 return result; 337 } 338 339 public static int getCameraOrientation(int cameraId) { 340 Camera.CameraInfo info = new Camera.CameraInfo(); 341 Camera.getCameraInfo(cameraId, info); 342 return info.orientation; 343 } 344 345 public static int roundOrientation(int orientation, int orientationHistory) { 346 boolean changeOrientation = false; 347 if (orientationHistory == OrientationEventListener.ORIENTATION_UNKNOWN) { 348 changeOrientation = true; 349 } else { 350 int dist = Math.abs(orientation - orientationHistory); 351 dist = Math.min( dist, 360 - dist ); 352 changeOrientation = ( dist >= 45 + ORIENTATION_HYSTERESIS ); 353 } 354 if (changeOrientation) { 355 return ((orientation + 45) / 90 * 90) % 360; 356 } 357 return orientationHistory; 358 } 359 360 @SuppressWarnings("deprecation") 361 @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2) 362 private static Point getDefaultDisplaySize(Activity activity, Point size) { 363 Display d = activity.getWindowManager().getDefaultDisplay(); 364 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) { 365 d.getSize(size); 366 } else { 367 size.set(d.getWidth(), d.getHeight()); 368 } 369 return size; 370 } 371 372 public static Size getOptimalPreviewSize(Activity currentActivity, 373 List<Size> sizes, double targetRatio) { 374 // Use a very small tolerance because we want an exact match. 375 final double ASPECT_TOLERANCE = 0.001; 376 if (sizes == null) return null; 377 378 Size optimalSize = null; 379 double minDiff = Double.MAX_VALUE; 380 381 // Because of bugs of overlay and layout, we sometimes will try to 382 // layout the viewfinder in the portrait orientation and thus get the 383 // wrong size of preview surface. When we change the preview size, the 384 // new overlay will be created before the old one closed, which causes 385 // an exception. For now, just get the screen size. 386 Point point = getDefaultDisplaySize(currentActivity, new Point()); 387 int targetHeight = Math.min(point.x, point.y); 388 389 // Try to find an size match aspect ratio and size 390 for (Size size : sizes) { 391 double ratio = (double) size.width / size.height; 392 if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue; 393 if (Math.abs(size.height - targetHeight) < minDiff) { 394 optimalSize = size; 395 minDiff = Math.abs(size.height - targetHeight); 396 } 397 } 398 399 // Cannot find the one match the aspect ratio. This should not happen. 400 // Ignore the requirement. 401 if (optimalSize == null) { 402 Log.w(TAG, "No preview size match the aspect ratio"); 403 minDiff = Double.MAX_VALUE; 404 for (Size size : sizes) { 405 if (Math.abs(size.height - targetHeight) < minDiff) { 406 optimalSize = size; 407 minDiff = Math.abs(size.height - targetHeight); 408 } 409 } 410 } 411 return optimalSize; 412 } 413 414 // Returns the largest picture size which matches the given aspect ratio. 415 public static Size getOptimalVideoSnapshotPictureSize( 416 List<Size> sizes, double targetRatio) { 417 // Use a very small tolerance because we want an exact match. 418 final double ASPECT_TOLERANCE = 0.001; 419 if (sizes == null) return null; 420 421 Size optimalSize = null; 422 423 // Try to find a size matches aspect ratio and has the largest width 424 for (Size size : sizes) { 425 double ratio = (double) size.width / size.height; 426 if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue; 427 if (optimalSize == null || size.width > optimalSize.width) { 428 optimalSize = size; 429 } 430 } 431 432 // Cannot find one that matches the aspect ratio. This should not happen. 433 // Ignore the requirement. 434 if (optimalSize == null) { 435 Log.w(TAG, "No picture size match the aspect ratio"); 436 for (Size size : sizes) { 437 if (optimalSize == null || size.width > optimalSize.width) { 438 optimalSize = size; 439 } 440 } 441 } 442 return optimalSize; 443 } 444 445 public static void dumpParameters(Parameters parameters) { 446 String flattened = parameters.flatten(); 447 StringTokenizer tokenizer = new StringTokenizer(flattened, ";"); 448 Log.d(TAG, "Dump all camera parameters:"); 449 while (tokenizer.hasMoreElements()) { 450 Log.d(TAG, tokenizer.nextToken()); 451 } 452 } 453 454 /** 455 * Returns whether the device is voice-capable (meaning, it can do MMS). 456 */ 457 public static boolean isMmsCapable(Context context) { 458 TelephonyManager telephonyManager = (TelephonyManager) 459 context.getSystemService(Context.TELEPHONY_SERVICE); 460 if (telephonyManager == null) { 461 return false; 462 } 463 464 try { 465 Class<?> partypes[] = new Class[0]; 466 Method sIsVoiceCapable = TelephonyManager.class.getMethod( 467 "isVoiceCapable", partypes); 468 469 Object arglist[] = new Object[0]; 470 Object retobj = sIsVoiceCapable.invoke(telephonyManager, arglist); 471 return (Boolean) retobj; 472 } catch (java.lang.reflect.InvocationTargetException ite) { 473 // Failure, must be another device. 474 // Assume that it is voice capable. 475 } catch (IllegalAccessException iae) { 476 // Failure, must be an other device. 477 // Assume that it is voice capable. 478 } catch (NoSuchMethodException nsme) { 479 } 480 return true; 481 } 482 483 // This is for test only. Allow the camera to launch the specific camera. 484 public static int getCameraFacingIntentExtras(Activity currentActivity) { 485 int cameraId = -1; 486 487 int intentCameraId = 488 currentActivity.getIntent().getIntExtra(Util.EXTRAS_CAMERA_FACING, -1); 489 490 if (isFrontCameraIntent(intentCameraId)) { 491 // Check if the front camera exist 492 int frontCameraId = CameraHolder.instance().getFrontCameraId(); 493 if (frontCameraId != -1) { 494 cameraId = frontCameraId; 495 } 496 } else if (isBackCameraIntent(intentCameraId)) { 497 // Check if the back camera exist 498 int backCameraId = CameraHolder.instance().getBackCameraId(); 499 if (backCameraId != -1) { 500 cameraId = backCameraId; 501 } 502 } 503 return cameraId; 504 } 505 506 private static boolean isFrontCameraIntent(int intentCameraId) { 507 return (intentCameraId == android.hardware.Camera.CameraInfo.CAMERA_FACING_FRONT); 508 } 509 510 private static boolean isBackCameraIntent(int intentCameraId) { 511 return (intentCameraId == android.hardware.Camera.CameraInfo.CAMERA_FACING_BACK); 512 } 513 514 private static int sLocation[] = new int[2]; 515 516 // This method is not thread-safe. 517 public static boolean pointInView(float x, float y, View v) { 518 v.getLocationInWindow(sLocation); 519 return x >= sLocation[0] && x < (sLocation[0] + v.getWidth()) 520 && y >= sLocation[1] && y < (sLocation[1] + v.getHeight()); 521 } 522 523 public static int[] getRelativeLocation(View reference, View view) { 524 reference.getLocationInWindow(sLocation); 525 int referenceX = sLocation[0]; 526 int referenceY = sLocation[1]; 527 view.getLocationInWindow(sLocation); 528 sLocation[0] -= referenceX; 529 sLocation[1] -= referenceY; 530 return sLocation; 531 } 532 533 public static boolean isUriValid(Uri uri, ContentResolver resolver) { 534 if (uri == null) return false; 535 536 try { 537 ParcelFileDescriptor pfd = resolver.openFileDescriptor(uri, "r"); 538 if (pfd == null) { 539 Log.e(TAG, "Fail to open URI. URI=" + uri); 540 return false; 541 } 542 pfd.close(); 543 } catch (IOException ex) { 544 return false; 545 } 546 return true; 547 } 548 549 public static void viewUri(Uri uri, Context context) { 550 if (!isUriValid(uri, context.getContentResolver())) { 551 Log.e(TAG, "Uri invalid. uri=" + uri); 552 return; 553 } 554 555 try { 556 context.startActivity(new Intent(Util.REVIEW_ACTION, uri)); 557 } catch (ActivityNotFoundException ex) { 558 try { 559 context.startActivity(new Intent(Intent.ACTION_VIEW, uri)); 560 } catch (ActivityNotFoundException e) { 561 Log.e(TAG, "review image fail. uri=" + uri, e); 562 } 563 } 564 } 565 566 public static void dumpRect(RectF rect, String msg) { 567 Log.v(TAG, msg + "=(" + rect.left + "," + rect.top 568 + "," + rect.right + "," + rect.bottom + ")"); 569 } 570 571 public static void rectFToRect(RectF rectF, Rect rect) { 572 rect.left = Math.round(rectF.left); 573 rect.top = Math.round(rectF.top); 574 rect.right = Math.round(rectF.right); 575 rect.bottom = Math.round(rectF.bottom); 576 } 577 578 public static void prepareMatrix(Matrix matrix, boolean mirror, int displayOrientation, 579 int viewWidth, int viewHeight) { 580 // Need mirror for front camera. 581 matrix.setScale(mirror ? -1 : 1, 1); 582 // This is the value for android.hardware.Camera.setDisplayOrientation. 583 matrix.postRotate(displayOrientation); 584 // Camera driver coordinates range from (-1000, -1000) to (1000, 1000). 585 // UI coordinates range from (0, 0) to (width, height). 586 matrix.postScale(viewWidth / 2000f, viewHeight / 2000f); 587 matrix.postTranslate(viewWidth / 2f, viewHeight / 2f); 588 } 589 590 public static String createJpegName(long dateTaken) { 591 synchronized (sImageFileNamer) { 592 return sImageFileNamer.generateName(dateTaken); 593 } 594 } 595 596 public static void broadcastNewPicture(Context context, Uri uri) { 597 context.sendBroadcast(new Intent(android.hardware.Camera.ACTION_NEW_PICTURE, uri)); 598 // Keep compatibility 599 context.sendBroadcast(new Intent("com.android.camera.NEW_PICTURE", uri)); 600 } 601 602 public static void fadeIn(View view, float startAlpha, float endAlpha, long duration) { 603 if (view.getVisibility() == View.VISIBLE) return; 604 605 view.setVisibility(View.VISIBLE); 606 Animation animation = new AlphaAnimation(startAlpha, endAlpha); 607 animation.setDuration(duration); 608 view.startAnimation(animation); 609 } 610 611 public static void fadeIn(View view) { 612 fadeIn(view, 0F, 1F, 400); 613 614 // We disabled the button in fadeOut(), so enable it here. 615 view.setEnabled(true); 616 } 617 618 public static void fadeOut(View view) { 619 if (view.getVisibility() != View.VISIBLE) return; 620 621 // Since the button is still clickable before fade-out animation 622 // ends, we disable the button first to block click. 623 view.setEnabled(false); 624 Animation animation = new AlphaAnimation(1F, 0F); 625 animation.setDuration(400); 626 view.startAnimation(animation); 627 view.setVisibility(View.GONE); 628 } 629 630 public static int getJpegRotation(int cameraId, int orientation) { 631 // See android.hardware.Camera.Parameters.setRotation for 632 // documentation. 633 int rotation = 0; 634 if (orientation != OrientationEventListener.ORIENTATION_UNKNOWN) { 635 CameraInfo info = CameraHolder.instance().getCameraInfo()[cameraId]; 636 if (info.facing == CameraInfo.CAMERA_FACING_FRONT) { 637 rotation = (info.orientation - orientation + 360) % 360; 638 } else { // back-facing camera 639 rotation = (info.orientation + orientation) % 360; 640 } 641 } 642 return rotation; 643 } 644 645 public static void setGpsParameters(Parameters parameters, Location loc) { 646 // Clear previous GPS location from the parameters. 647 parameters.removeGpsData(); 648 649 // We always encode GpsTimeStamp 650 parameters.setGpsTimestamp(System.currentTimeMillis() / 1000); 651 652 // Set GPS location. 653 if (loc != null) { 654 double lat = loc.getLatitude(); 655 double lon = loc.getLongitude(); 656 boolean hasLatLon = (lat != 0.0d) || (lon != 0.0d); 657 658 if (hasLatLon) { 659 Log.d(TAG, "Set gps location"); 660 parameters.setGpsLatitude(lat); 661 parameters.setGpsLongitude(lon); 662 parameters.setGpsProcessingMethod(loc.getProvider().toUpperCase()); 663 if (loc.hasAltitude()) { 664 parameters.setGpsAltitude(loc.getAltitude()); 665 } else { 666 // for NETWORK_PROVIDER location provider, we may have 667 // no altitude information, but the driver needs it, so 668 // we fake one. 669 parameters.setGpsAltitude(0); 670 } 671 if (loc.getTime() != 0) { 672 // Location.getTime() is UTC in milliseconds. 673 // gps-timestamp is UTC in seconds. 674 long utcTimeSeconds = loc.getTime() / 1000; 675 parameters.setGpsTimestamp(utcTimeSeconds); 676 } 677 } else { 678 loc = null; 679 } 680 } 681 } 682 683 private static class ImageFileNamer { 684 private SimpleDateFormat mFormat; 685 686 // The date (in milliseconds) used to generate the last name. 687 private long mLastDate; 688 689 // Number of names generated for the same second. 690 private int mSameSecondCount; 691 692 public ImageFileNamer(String format) { 693 mFormat = new SimpleDateFormat(format); 694 } 695 696 public String generateName(long dateTaken) { 697 Date date = new Date(dateTaken); 698 String result = mFormat.format(date); 699 700 // If the last name was generated for the same second, 701 // we append _1, _2, etc to the name. 702 if (dateTaken / 1000 == mLastDate / 1000) { 703 mSameSecondCount++; 704 result += "_" + mSameSecondCount; 705 } else { 706 mLastDate = dateTaken; 707 mSameSecondCount = 0; 708 } 709 710 return result; 711 } 712 } 713} 714