WallpaperManager.java revision a457211af55b2ad5bc58f4228ceb147ac22c92b0
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 android.app; 18 19import android.content.ContentResolver; 20import android.content.Context; 21import android.content.Intent; 22import android.content.pm.PackageManager; 23import android.content.pm.ResolveInfo; 24import android.content.res.Resources; 25import android.graphics.Bitmap; 26import android.graphics.BitmapFactory; 27import android.graphics.BitmapRegionDecoder; 28import android.graphics.Canvas; 29import android.graphics.ColorFilter; 30import android.graphics.Matrix; 31import android.graphics.Paint; 32import android.graphics.PixelFormat; 33import android.graphics.PorterDuff; 34import android.graphics.PorterDuffXfermode; 35import android.graphics.Rect; 36import android.graphics.RectF; 37import android.graphics.drawable.BitmapDrawable; 38import android.graphics.drawable.Drawable; 39import android.net.Uri; 40import android.os.Bundle; 41import android.os.Handler; 42import android.os.IBinder; 43import android.os.Looper; 44import android.os.Message; 45import android.os.ParcelFileDescriptor; 46import android.os.RemoteException; 47import android.os.ServiceManager; 48import android.util.DisplayMetrics; 49import android.util.Log; 50import android.view.WindowManager; 51import android.view.WindowManagerGlobal; 52 53import java.io.BufferedInputStream; 54import java.io.FileOutputStream; 55import java.io.IOException; 56import java.io.InputStream; 57import java.util.List; 58 59/** 60 * Provides access to the system wallpaper. With WallpaperManager, you can 61 * get the current wallpaper, get the desired dimensions for the wallpaper, set 62 * the wallpaper, and more. Get an instance of WallpaperManager with 63 * {@link #getInstance(android.content.Context) getInstance()}. 64 */ 65public class WallpaperManager { 66 private static String TAG = "WallpaperManager"; 67 private static boolean DEBUG = false; 68 private float mWallpaperXStep = -1; 69 private float mWallpaperYStep = -1; 70 71 /** 72 * Activity Action: Show settings for choosing wallpaper. Do not use directly to construct 73 * an intent; instead, use {@link #getCropAndSetWallpaperIntent}. 74 * <p>Input: {@link Intent#getData} is the URI of the image to crop and set as wallpaper. 75 * <p>Output: RESULT_OK if user decided to crop/set the wallpaper, RESULT_CANCEL otherwise 76 * Activities that support this intent should specify a MIME filter of "image/*" 77 */ 78 public static final String ACTION_CROP_AND_SET_WALLPAPER = 79 "android.service.wallpaper.CROP_AND_SET_WALLPAPER"; 80 81 /** 82 * Launch an activity for the user to pick the current global live 83 * wallpaper. 84 */ 85 public static final String ACTION_LIVE_WALLPAPER_CHOOSER 86 = "android.service.wallpaper.LIVE_WALLPAPER_CHOOSER"; 87 88 /** 89 * Directly launch live wallpaper preview, allowing the user to immediately 90 * confirm to switch to a specific live wallpaper. You must specify 91 * {@link #EXTRA_LIVE_WALLPAPER_COMPONENT} with the ComponentName of 92 * a live wallpaper component that is to be shown. 93 */ 94 public static final String ACTION_CHANGE_LIVE_WALLPAPER 95 = "android.service.wallpaper.CHANGE_LIVE_WALLPAPER"; 96 97 /** 98 * Extra in {@link #ACTION_CHANGE_LIVE_WALLPAPER} that specifies the 99 * ComponentName of a live wallpaper that should be shown as a preview, 100 * for the user to confirm. 101 */ 102 public static final String EXTRA_LIVE_WALLPAPER_COMPONENT 103 = "android.service.wallpaper.extra.LIVE_WALLPAPER_COMPONENT"; 104 105 /** 106 * Manifest entry for activities that respond to {@link Intent#ACTION_SET_WALLPAPER} 107 * which allows them to provide a custom large icon associated with this action. 108 */ 109 public static final String WALLPAPER_PREVIEW_META_DATA = "android.wallpaper.preview"; 110 111 /** 112 * Command for {@link #sendWallpaperCommand}: reported by the wallpaper 113 * host when the user taps on an empty area (not performing an action 114 * in the host). The x and y arguments are the location of the tap in 115 * screen coordinates. 116 */ 117 public static final String COMMAND_TAP = "android.wallpaper.tap"; 118 119 /** 120 * Command for {@link #sendWallpaperCommand}: reported by the wallpaper 121 * host when the user releases a secondary pointer on an empty area 122 * (not performing an action in the host). The x and y arguments are 123 * the location of the secondary tap in screen coordinates. 124 */ 125 public static final String COMMAND_SECONDARY_TAP = "android.wallpaper.secondaryTap"; 126 127 /** 128 * Command for {@link #sendWallpaperCommand}: reported by the wallpaper 129 * host when the user drops an object into an area of the host. The x 130 * and y arguments are the location of the drop. 131 */ 132 public static final String COMMAND_DROP = "android.home.drop"; 133 134 private final Context mContext; 135 136 /** 137 * Special drawable that draws a wallpaper as fast as possible. Assumes 138 * no scaling or placement off (0,0) of the wallpaper (this should be done 139 * at the time the bitmap is loaded). 140 */ 141 static class FastBitmapDrawable extends Drawable { 142 private final Bitmap mBitmap; 143 private final int mWidth; 144 private final int mHeight; 145 private int mDrawLeft; 146 private int mDrawTop; 147 private final Paint mPaint; 148 149 private FastBitmapDrawable(Bitmap bitmap) { 150 mBitmap = bitmap; 151 mWidth = bitmap.getWidth(); 152 mHeight = bitmap.getHeight(); 153 154 setBounds(0, 0, mWidth, mHeight); 155 156 mPaint = new Paint(); 157 mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC)); 158 } 159 160 @Override 161 public void draw(Canvas canvas) { 162 canvas.drawBitmap(mBitmap, mDrawLeft, mDrawTop, mPaint); 163 } 164 165 @Override 166 public int getOpacity() { 167 return PixelFormat.OPAQUE; 168 } 169 170 @Override 171 public void setBounds(int left, int top, int right, int bottom) { 172 mDrawLeft = left + (right-left - mWidth) / 2; 173 mDrawTop = top + (bottom-top - mHeight) / 2; 174 } 175 176 @Override 177 public void setAlpha(int alpha) { 178 throw new UnsupportedOperationException("Not supported with this drawable"); 179 } 180 181 @Override 182 public void setColorFilter(ColorFilter cf) { 183 throw new UnsupportedOperationException("Not supported with this drawable"); 184 } 185 186 @Override 187 public void setDither(boolean dither) { 188 throw new UnsupportedOperationException("Not supported with this drawable"); 189 } 190 191 @Override 192 public void setFilterBitmap(boolean filter) { 193 throw new UnsupportedOperationException("Not supported with this drawable"); 194 } 195 196 @Override 197 public int getIntrinsicWidth() { 198 return mWidth; 199 } 200 201 @Override 202 public int getIntrinsicHeight() { 203 return mHeight; 204 } 205 206 @Override 207 public int getMinimumWidth() { 208 return mWidth; 209 } 210 211 @Override 212 public int getMinimumHeight() { 213 return mHeight; 214 } 215 } 216 217 static class Globals extends IWallpaperManagerCallback.Stub { 218 private IWallpaperManager mService; 219 private Bitmap mWallpaper; 220 private Bitmap mDefaultWallpaper; 221 222 private static final int MSG_CLEAR_WALLPAPER = 1; 223 224 private final Handler mHandler; 225 226 Globals(Looper looper) { 227 IBinder b = ServiceManager.getService(Context.WALLPAPER_SERVICE); 228 mService = IWallpaperManager.Stub.asInterface(b); 229 mHandler = new Handler(looper) { 230 @Override 231 public void handleMessage(Message msg) { 232 switch (msg.what) { 233 case MSG_CLEAR_WALLPAPER: 234 synchronized (this) { 235 mWallpaper = null; 236 mDefaultWallpaper = null; 237 } 238 break; 239 } 240 } 241 }; 242 } 243 244 public void onWallpaperChanged() { 245 /* The wallpaper has changed but we shouldn't eagerly load the 246 * wallpaper as that would be inefficient. Reset the cached wallpaper 247 * to null so if the user requests the wallpaper again then we'll 248 * fetch it. 249 */ 250 mHandler.sendEmptyMessage(MSG_CLEAR_WALLPAPER); 251 } 252 253 public Bitmap peekWallpaperBitmap(Context context, boolean returnDefault) { 254 synchronized (this) { 255 if (mWallpaper != null) { 256 return mWallpaper; 257 } 258 if (mDefaultWallpaper != null) { 259 return mDefaultWallpaper; 260 } 261 mWallpaper = null; 262 try { 263 mWallpaper = getCurrentWallpaperLocked(context); 264 } catch (OutOfMemoryError e) { 265 Log.w(TAG, "No memory load current wallpaper", e); 266 } 267 if (returnDefault) { 268 if (mWallpaper == null) { 269 mDefaultWallpaper = getDefaultWallpaperLocked(context); 270 return mDefaultWallpaper; 271 } else { 272 mDefaultWallpaper = null; 273 } 274 } 275 return mWallpaper; 276 } 277 } 278 279 public void forgetLoadedWallpaper() { 280 synchronized (this) { 281 mWallpaper = null; 282 mDefaultWallpaper = null; 283 } 284 } 285 286 private Bitmap getCurrentWallpaperLocked(Context context) { 287 try { 288 Bundle params = new Bundle(); 289 ParcelFileDescriptor fd = mService.getWallpaper(this, params); 290 if (fd != null) { 291 int width = params.getInt("width", 0); 292 int height = params.getInt("height", 0); 293 294 try { 295 BitmapFactory.Options options = new BitmapFactory.Options(); 296 Bitmap bm = BitmapFactory.decodeFileDescriptor( 297 fd.getFileDescriptor(), null, options); 298 return generateBitmap(context, bm, width, height); 299 } catch (OutOfMemoryError e) { 300 Log.w(TAG, "Can't decode file", e); 301 } finally { 302 try { 303 fd.close(); 304 } catch (IOException e) { 305 // Ignore 306 } 307 } 308 } 309 } catch (RemoteException e) { 310 // Ignore 311 } 312 return null; 313 } 314 315 private Bitmap getDefaultWallpaperLocked(Context context) { 316 try { 317 InputStream is = context.getResources().openRawResource( 318 com.android.internal.R.drawable.default_wallpaper); 319 if (is != null) { 320 int width = mService.getWidthHint(); 321 int height = mService.getHeightHint(); 322 323 try { 324 BitmapFactory.Options options = new BitmapFactory.Options(); 325 Bitmap bm = BitmapFactory.decodeStream(is, null, options); 326 return generateBitmap(context, bm, width, height); 327 } catch (OutOfMemoryError e) { 328 Log.w(TAG, "Can't decode stream", e); 329 } finally { 330 try { 331 is.close(); 332 } catch (IOException e) { 333 // Ignore 334 } 335 } 336 } 337 } catch (RemoteException e) { 338 // Ignore 339 } 340 return null; 341 } 342 } 343 344 private static final Object sSync = new Object[0]; 345 private static Globals sGlobals; 346 347 static void initGlobals(Looper looper) { 348 synchronized (sSync) { 349 if (sGlobals == null) { 350 sGlobals = new Globals(looper); 351 } 352 } 353 } 354 355 /*package*/ WallpaperManager(Context context, Handler handler) { 356 mContext = context; 357 initGlobals(context.getMainLooper()); 358 } 359 360 /** 361 * Retrieve a WallpaperManager associated with the given Context. 362 */ 363 public static WallpaperManager getInstance(Context context) { 364 return (WallpaperManager)context.getSystemService( 365 Context.WALLPAPER_SERVICE); 366 } 367 368 /** @hide */ 369 public IWallpaperManager getIWallpaperManager() { 370 return sGlobals.mService; 371 } 372 373 /** 374 * Retrieve the current system wallpaper; if 375 * no wallpaper is set, the system built-in static wallpaper is returned. 376 * This is returned as an 377 * abstract Drawable that you can install in a View to display whatever 378 * wallpaper the user has currently set. 379 * 380 * @return Returns a Drawable object that will draw the wallpaper. 381 */ 382 public Drawable getDrawable() { 383 Bitmap bm = sGlobals.peekWallpaperBitmap(mContext, true); 384 if (bm != null) { 385 Drawable dr = new BitmapDrawable(mContext.getResources(), bm); 386 dr.setDither(false); 387 return dr; 388 } 389 return null; 390 } 391 392 /** 393 * Returns a drawable for the system built-in static wallpaper . 394 * 395 */ 396 public Drawable getBuiltInDrawable() { 397 return getBuiltInDrawable(0, 0, false, 0, 0); 398 } 399 400 /** 401 * Returns a drawable for the system built-in static wallpaper. Based on the parameters, the 402 * drawable can be cropped and scaled 403 * 404 * @param outWidth The width of the returned drawable 405 * @param outWidth The height of the returned drawable 406 * @param scaleToFit If true, scale the wallpaper down rather than just cropping it 407 * @param horizontalAlignment A float value between 0 and 1 specifying where to crop the image; 408 * 0 for left-aligned, 0.5 for horizontal center-aligned, and 1 for right-aligned 409 * @param verticalAlignment A float value between 0 and 1 specifying where to crop the image; 410 * 0 for top-aligned, 0.5 for vertical center-aligned, and 1 for bottom-aligned 411 * 412 */ 413 public Drawable getBuiltInDrawable(int outWidth, int outHeight, 414 boolean scaleToFit, float horizontalAlignment, float verticalAlignment) { 415 if (sGlobals.mService == null) { 416 Log.w(TAG, "WallpaperService not running"); 417 return null; 418 } 419 Resources resources = mContext.getResources(); 420 horizontalAlignment = Math.max(0, Math.min(1, horizontalAlignment)); 421 verticalAlignment = Math.max(0, Math.min(1, verticalAlignment)); 422 423 InputStream is = new BufferedInputStream( 424 resources.openRawResource(com.android.internal.R.drawable.default_wallpaper)); 425 426 if (is == null) { 427 Log.e(TAG, "default wallpaper input stream is null"); 428 return null; 429 } else { 430 if (outWidth <= 0 || outHeight <= 0) { 431 Bitmap fullSize = BitmapFactory.decodeStream(is, null, null); 432 return new BitmapDrawable(resources, fullSize); 433 } else { 434 int inWidth; 435 int inHeight; 436 { 437 BitmapFactory.Options options = new BitmapFactory.Options(); 438 options.inJustDecodeBounds = true; 439 BitmapFactory.decodeStream(is, null, options); 440 if (options.outWidth != 0 && options.outHeight != 0) { 441 inWidth = options.outWidth; 442 inHeight = options.outHeight; 443 } else { 444 Log.e(TAG, "default wallpaper dimensions are 0"); 445 return null; 446 } 447 } 448 449 is = new BufferedInputStream(resources.openRawResource( 450 com.android.internal.R.drawable.default_wallpaper)); 451 452 RectF cropRectF; 453 454 outWidth = Math.min(inWidth, outWidth); 455 outHeight = Math.min(inHeight, outHeight); 456 if (scaleToFit) { 457 cropRectF = getMaxCropRect(inWidth, inHeight, outWidth, outHeight, 458 horizontalAlignment, verticalAlignment); 459 } else { 460 float left = (inWidth - outWidth) * horizontalAlignment; 461 float right = left + outWidth; 462 float top = (inHeight - outHeight) * verticalAlignment; 463 float bottom = top + outHeight; 464 cropRectF = new RectF(left, top, right, bottom); 465 } 466 Rect roundedTrueCrop = new Rect(); 467 cropRectF.roundOut(roundedTrueCrop); 468 469 if (roundedTrueCrop.width() <= 0 || roundedTrueCrop.height() <= 0) { 470 Log.w(TAG, "crop has bad values for full size image"); 471 return null; 472 } 473 474 // See how much we're reducing the size of the image 475 int scaleDownSampleSize = Math.min(roundedTrueCrop.width() / outWidth, 476 roundedTrueCrop.height() / outHeight); 477 478 // Attempt to open a region decoder 479 BitmapRegionDecoder decoder = null; 480 try { 481 decoder = BitmapRegionDecoder.newInstance(is, true); 482 } catch (IOException e) { 483 Log.w(TAG, "cannot open region decoder for default wallpaper"); 484 } 485 486 Bitmap crop = null; 487 if (decoder != null) { 488 // Do region decoding to get crop bitmap 489 BitmapFactory.Options options = new BitmapFactory.Options(); 490 if (scaleDownSampleSize > 1) { 491 options.inSampleSize = scaleDownSampleSize; 492 } 493 crop = decoder.decodeRegion(roundedTrueCrop, options); 494 decoder.recycle(); 495 } 496 497 if (crop == null) { 498 // BitmapRegionDecoder has failed, try to crop in-memory 499 is = new BufferedInputStream(resources.openRawResource( 500 com.android.internal.R.drawable.default_wallpaper)); 501 Bitmap fullSize = null; 502 if (is != null) { 503 BitmapFactory.Options options = new BitmapFactory.Options(); 504 if (scaleDownSampleSize > 1) { 505 options.inSampleSize = scaleDownSampleSize; 506 } 507 fullSize = BitmapFactory.decodeStream(is, null, options); 508 } 509 if (fullSize != null) { 510 crop = Bitmap.createBitmap(fullSize, roundedTrueCrop.left, 511 roundedTrueCrop.top, roundedTrueCrop.width(), 512 roundedTrueCrop.height()); 513 } 514 } 515 516 if (crop == null) { 517 Log.w(TAG, "cannot decode default wallpaper"); 518 return null; 519 } 520 521 // Scale down if necessary 522 if (outWidth > 0 && outHeight > 0 && 523 (crop.getWidth() != outWidth || crop.getHeight() != outHeight)) { 524 Matrix m = new Matrix(); 525 RectF cropRect = new RectF(0, 0, crop.getWidth(), crop.getHeight()); 526 RectF returnRect = new RectF(0, 0, outWidth, outHeight); 527 m.setRectToRect(cropRect, returnRect, Matrix.ScaleToFit.FILL); 528 Bitmap tmp = Bitmap.createBitmap((int) returnRect.width(), 529 (int) returnRect.height(), Bitmap.Config.ARGB_8888); 530 if (tmp != null) { 531 Canvas c = new Canvas(tmp); 532 Paint p = new Paint(); 533 p.setFilterBitmap(true); 534 c.drawBitmap(crop, m, p); 535 crop = tmp; 536 } 537 } 538 539 return new BitmapDrawable(resources, crop); 540 } 541 } 542 } 543 544 private static RectF getMaxCropRect(int inWidth, int inHeight, int outWidth, int outHeight, 545 float horizontalAlignment, float verticalAlignment) { 546 RectF cropRect = new RectF(); 547 // Get a crop rect that will fit this 548 if (inWidth / (float) inHeight > outWidth / (float) outHeight) { 549 cropRect.top = 0; 550 cropRect.bottom = inHeight; 551 float cropWidth = outWidth * (inHeight / (float) outHeight); 552 cropRect.left = (inWidth - cropWidth) * horizontalAlignment; 553 cropRect.right = cropRect.left + cropWidth; 554 } else { 555 cropRect.left = 0; 556 cropRect.right = inWidth; 557 float cropHeight = outHeight * (inWidth / (float) outWidth); 558 cropRect.top = (inHeight - cropHeight) * verticalAlignment; 559 cropRect.bottom = cropRect.top + cropHeight; 560 } 561 return cropRect; 562 } 563 564 /** 565 * Retrieve the current system wallpaper; if there is no wallpaper set, 566 * a null pointer is returned. This is returned as an 567 * abstract Drawable that you can install in a View to display whatever 568 * wallpaper the user has currently set. 569 * 570 * @return Returns a Drawable object that will draw the wallpaper or a 571 * null pointer if these is none. 572 */ 573 public Drawable peekDrawable() { 574 Bitmap bm = sGlobals.peekWallpaperBitmap(mContext, false); 575 if (bm != null) { 576 Drawable dr = new BitmapDrawable(mContext.getResources(), bm); 577 dr.setDither(false); 578 return dr; 579 } 580 return null; 581 } 582 583 /** 584 * Like {@link #getDrawable()}, but the returned Drawable has a number 585 * of limitations to reduce its overhead as much as possible. It will 586 * never scale the wallpaper (only centering it if the requested bounds 587 * do match the bitmap bounds, which should not be typical), doesn't 588 * allow setting an alpha, color filter, or other attributes, etc. The 589 * bounds of the returned drawable will be initialized to the same bounds 590 * as the wallpaper, so normally you will not need to touch it. The 591 * drawable also assumes that it will be used in a context running in 592 * the same density as the screen (not in density compatibility mode). 593 * 594 * @return Returns a Drawable object that will draw the wallpaper. 595 */ 596 public Drawable getFastDrawable() { 597 Bitmap bm = sGlobals.peekWallpaperBitmap(mContext, true); 598 if (bm != null) { 599 return new FastBitmapDrawable(bm); 600 } 601 return null; 602 } 603 604 /** 605 * Like {@link #getFastDrawable()}, but if there is no wallpaper set, 606 * a null pointer is returned. 607 * 608 * @return Returns an optimized Drawable object that will draw the 609 * wallpaper or a null pointer if these is none. 610 */ 611 public Drawable peekFastDrawable() { 612 Bitmap bm = sGlobals.peekWallpaperBitmap(mContext, false); 613 if (bm != null) { 614 return new FastBitmapDrawable(bm); 615 } 616 return null; 617 } 618 619 /** 620 * Like {@link #getDrawable()} but returns a Bitmap. 621 * 622 * @hide 623 */ 624 public Bitmap getBitmap() { 625 return sGlobals.peekWallpaperBitmap(mContext, true); 626 } 627 628 /** 629 * Remove all internal references to the last loaded wallpaper. Useful 630 * for apps that want to reduce memory usage when they only temporarily 631 * need to have the wallpaper. After calling, the next request for the 632 * wallpaper will require reloading it again from disk. 633 */ 634 public void forgetLoadedWallpaper() { 635 sGlobals.forgetLoadedWallpaper(); 636 } 637 638 /** 639 * If the current wallpaper is a live wallpaper component, return the 640 * information about that wallpaper. Otherwise, if it is a static image, 641 * simply return null. 642 */ 643 public WallpaperInfo getWallpaperInfo() { 644 try { 645 if (sGlobals.mService == null) { 646 Log.w(TAG, "WallpaperService not running"); 647 return null; 648 } else { 649 return sGlobals.mService.getWallpaperInfo(); 650 } 651 } catch (RemoteException e) { 652 return null; 653 } 654 } 655 656 /** 657 * Gets an Intent that will launch an activity that crops the given 658 * image and sets the device's wallpaper. If there is a default HOME activity 659 * that supports cropping wallpapers, it will be preferred as the default. 660 * Use this method instead of directly creating a {@link #ACTION_CROP_AND_SET_WALLPAPER} 661 * intent. 662 * 663 * @param imageUri The image URI that will be set in the intent. The must be a content 664 * URI and its provider must resolve its type to "image/*" 665 * 666 * @throws IllegalArgumentException if the URI is not a content URI or its MIME type is 667 * not "image/*" 668 */ 669 public Intent getCropAndSetWallpaperIntent(Uri imageUri) { 670 if (!ContentResolver.SCHEME_CONTENT.equals(imageUri.getScheme())) { 671 throw new IllegalArgumentException("Image URI must be of the " 672 + ContentResolver.SCHEME_CONTENT + " scheme type"); 673 } 674 675 final PackageManager packageManager = mContext.getPackageManager(); 676 Intent cropAndSetWallpaperIntent = 677 new Intent(ACTION_CROP_AND_SET_WALLPAPER, imageUri); 678 cropAndSetWallpaperIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); 679 680 // Find out if the default HOME activity supports CROP_AND_SET_WALLPAPER 681 Intent homeIntent = new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME); 682 ResolveInfo resolvedHome = packageManager.resolveActivity(homeIntent, 683 PackageManager.MATCH_DEFAULT_ONLY); 684 if (resolvedHome != null) { 685 cropAndSetWallpaperIntent.setPackage(resolvedHome.activityInfo.packageName); 686 687 List<ResolveInfo> cropAppList = packageManager.queryIntentActivities( 688 cropAndSetWallpaperIntent, 0); 689 if (cropAppList.size() > 0) { 690 return cropAndSetWallpaperIntent; 691 } 692 } 693 694 // fallback crop activity 695 cropAndSetWallpaperIntent.setPackage("com.android.wallpapercropper"); 696 List<ResolveInfo> cropAppList = packageManager.queryIntentActivities( 697 cropAndSetWallpaperIntent, 0); 698 if (cropAppList.size() > 0) { 699 return cropAndSetWallpaperIntent; 700 } 701 // If the URI is not of the right type, or for some reason the system wallpaper 702 // cropper doesn't exist, return null 703 throw new IllegalArgumentException("Cannot use passed URI to set wallpaper; " + 704 "check that the type returned by ContentProvider matches image/*"); 705 } 706 707 /** 708 * Change the current system wallpaper to the bitmap in the given resource. 709 * The resource is opened as a raw data stream and copied into the 710 * wallpaper; it must be a valid PNG or JPEG image. On success, the intent 711 * {@link Intent#ACTION_WALLPAPER_CHANGED} is broadcast. 712 * 713 * <p>This method requires the caller to hold the permission 714 * {@link android.Manifest.permission#SET_WALLPAPER}. 715 * 716 * @param resid The bitmap to save. 717 * 718 * @throws IOException If an error occurs reverting to the built-in 719 * wallpaper. 720 */ 721 public void setResource(int resid) throws IOException { 722 if (sGlobals.mService == null) { 723 Log.w(TAG, "WallpaperService not running"); 724 return; 725 } 726 try { 727 Resources resources = mContext.getResources(); 728 /* Set the wallpaper to the default values */ 729 ParcelFileDescriptor fd = sGlobals.mService.setWallpaper( 730 "res:" + resources.getResourceName(resid)); 731 if (fd != null) { 732 FileOutputStream fos = null; 733 try { 734 fos = new ParcelFileDescriptor.AutoCloseOutputStream(fd); 735 setWallpaper(resources.openRawResource(resid), fos); 736 } finally { 737 if (fos != null) { 738 fos.close(); 739 } 740 } 741 } 742 } catch (RemoteException e) { 743 // Ignore 744 } 745 } 746 747 /** 748 * Change the current system wallpaper to a bitmap. The given bitmap is 749 * converted to a PNG and stored as the wallpaper. On success, the intent 750 * {@link Intent#ACTION_WALLPAPER_CHANGED} is broadcast. 751 * 752 * <p>This method requires the caller to hold the permission 753 * {@link android.Manifest.permission#SET_WALLPAPER}. 754 * 755 * @param bitmap The bitmap to save. 756 * 757 * @throws IOException If an error occurs reverting to the built-in 758 * wallpaper. 759 */ 760 public void setBitmap(Bitmap bitmap) throws IOException { 761 if (sGlobals.mService == null) { 762 Log.w(TAG, "WallpaperService not running"); 763 return; 764 } 765 try { 766 ParcelFileDescriptor fd = sGlobals.mService.setWallpaper(null); 767 if (fd == null) { 768 return; 769 } 770 FileOutputStream fos = null; 771 try { 772 fos = new ParcelFileDescriptor.AutoCloseOutputStream(fd); 773 bitmap.compress(Bitmap.CompressFormat.PNG, 90, fos); 774 } finally { 775 if (fos != null) { 776 fos.close(); 777 } 778 } 779 } catch (RemoteException e) { 780 // Ignore 781 } 782 } 783 784 /** 785 * Change the current system wallpaper to a specific byte stream. The 786 * give InputStream is copied into persistent storage and will now be 787 * used as the wallpaper. Currently it must be either a JPEG or PNG 788 * image. On success, the intent {@link Intent#ACTION_WALLPAPER_CHANGED} 789 * is broadcast. 790 * 791 * <p>This method requires the caller to hold the permission 792 * {@link android.Manifest.permission#SET_WALLPAPER}. 793 * 794 * @param data A stream containing the raw data to install as a wallpaper. 795 * 796 * @throws IOException If an error occurs reverting to the built-in 797 * wallpaper. 798 */ 799 public void setStream(InputStream data) throws IOException { 800 if (sGlobals.mService == null) { 801 Log.w(TAG, "WallpaperService not running"); 802 return; 803 } 804 try { 805 ParcelFileDescriptor fd = sGlobals.mService.setWallpaper(null); 806 if (fd == null) { 807 return; 808 } 809 FileOutputStream fos = null; 810 try { 811 fos = new ParcelFileDescriptor.AutoCloseOutputStream(fd); 812 setWallpaper(data, fos); 813 } finally { 814 if (fos != null) { 815 fos.close(); 816 } 817 } 818 } catch (RemoteException e) { 819 // Ignore 820 } 821 } 822 823 private void setWallpaper(InputStream data, FileOutputStream fos) 824 throws IOException { 825 byte[] buffer = new byte[32768]; 826 int amt; 827 while ((amt=data.read(buffer)) > 0) { 828 fos.write(buffer, 0, amt); 829 } 830 } 831 832 /** 833 * Return whether any users are currently set to use the wallpaper 834 * with the given resource ID. That is, their wallpaper has been 835 * set through {@link #setResource(int)} with the same resource id. 836 */ 837 public boolean hasResourceWallpaper(int resid) { 838 if (sGlobals.mService == null) { 839 Log.w(TAG, "WallpaperService not running"); 840 return false; 841 } 842 try { 843 Resources resources = mContext.getResources(); 844 String name = "res:" + resources.getResourceName(resid); 845 return sGlobals.mService.hasNamedWallpaper(name); 846 } catch (RemoteException e) { 847 return false; 848 } 849 } 850 851 /** 852 * Returns the desired minimum width for the wallpaper. Callers of 853 * {@link #setBitmap(android.graphics.Bitmap)} or 854 * {@link #setStream(java.io.InputStream)} should check this value 855 * beforehand to make sure the supplied wallpaper respects the desired 856 * minimum width. 857 * 858 * If the returned value is <= 0, the caller should use the width of 859 * the default display instead. 860 * 861 * @return The desired minimum width for the wallpaper. This value should 862 * be honored by applications that set the wallpaper but it is not 863 * mandatory. 864 */ 865 public int getDesiredMinimumWidth() { 866 if (sGlobals.mService == null) { 867 Log.w(TAG, "WallpaperService not running"); 868 return 0; 869 } 870 try { 871 return sGlobals.mService.getWidthHint(); 872 } catch (RemoteException e) { 873 // Shouldn't happen! 874 return 0; 875 } 876 } 877 878 /** 879 * Returns the desired minimum height for the wallpaper. Callers of 880 * {@link #setBitmap(android.graphics.Bitmap)} or 881 * {@link #setStream(java.io.InputStream)} should check this value 882 * beforehand to make sure the supplied wallpaper respects the desired 883 * minimum height. 884 * 885 * If the returned value is <= 0, the caller should use the height of 886 * the default display instead. 887 * 888 * @return The desired minimum height for the wallpaper. This value should 889 * be honored by applications that set the wallpaper but it is not 890 * mandatory. 891 */ 892 public int getDesiredMinimumHeight() { 893 if (sGlobals.mService == null) { 894 Log.w(TAG, "WallpaperService not running"); 895 return 0; 896 } 897 try { 898 return sGlobals.mService.getHeightHint(); 899 } catch (RemoteException e) { 900 // Shouldn't happen! 901 return 0; 902 } 903 } 904 905 /** 906 * For use only by the current home application, to specify the size of 907 * wallpaper it would like to use. This allows such applications to have 908 * a virtual wallpaper that is larger than the physical screen, matching 909 * the size of their workspace. 910 * 911 * <p>Note developers, who don't seem to be reading this. This is 912 * for <em>home screens</em> to tell what size wallpaper they would like. 913 * Nobody else should be calling this! Certainly not other non-home-screen 914 * apps that change the wallpaper. Those apps are supposed to 915 * <b>retrieve</b> the suggested size so they can construct a wallpaper 916 * that matches it. 917 * 918 * <p>This method requires the caller to hold the permission 919 * {@link android.Manifest.permission#SET_WALLPAPER_HINTS}. 920 * 921 * @param minimumWidth Desired minimum width 922 * @param minimumHeight Desired minimum height 923 */ 924 public void suggestDesiredDimensions(int minimumWidth, int minimumHeight) { 925 try { 926 if (sGlobals.mService == null) { 927 Log.w(TAG, "WallpaperService not running"); 928 } else { 929 sGlobals.mService.setDimensionHints(minimumWidth, minimumHeight); 930 } 931 } catch (RemoteException e) { 932 // Ignore 933 } 934 } 935 936 /** 937 * Set the position of the current wallpaper within any larger space, when 938 * that wallpaper is visible behind the given window. The X and Y offsets 939 * are floating point numbers ranging from 0 to 1, representing where the 940 * wallpaper should be positioned within the screen space. These only 941 * make sense when the wallpaper is larger than the screen. 942 * 943 * @param windowToken The window who these offsets should be associated 944 * with, as returned by {@link android.view.View#getWindowToken() 945 * View.getWindowToken()}. 946 * @param xOffset The offset along the X dimension, from 0 to 1. 947 * @param yOffset The offset along the Y dimension, from 0 to 1. 948 */ 949 public void setWallpaperOffsets(IBinder windowToken, float xOffset, float yOffset) { 950 try { 951 //Log.v(TAG, "Sending new wallpaper offsets from app..."); 952 WindowManagerGlobal.getWindowSession().setWallpaperPosition( 953 windowToken, xOffset, yOffset, mWallpaperXStep, mWallpaperYStep); 954 //Log.v(TAG, "...app returning after sending offsets!"); 955 } catch (RemoteException e) { 956 // Ignore. 957 } 958 } 959 960 /** 961 * For applications that use multiple virtual screens showing a wallpaper, 962 * specify the step size between virtual screens. For example, if the 963 * launcher has 3 virtual screens, it would specify an xStep of 0.5, 964 * since the X offset for those screens are 0.0, 0.5 and 1.0 965 * @param xStep The X offset delta from one screen to the next one 966 * @param yStep The Y offset delta from one screen to the next one 967 */ 968 public void setWallpaperOffsetSteps(float xStep, float yStep) { 969 mWallpaperXStep = xStep; 970 mWallpaperYStep = yStep; 971 } 972 973 /** 974 * Send an arbitrary command to the current active wallpaper. 975 * 976 * @param windowToken The window who these offsets should be associated 977 * with, as returned by {@link android.view.View#getWindowToken() 978 * View.getWindowToken()}. 979 * @param action Name of the command to perform. This must be a scoped 980 * name to avoid collisions, such as "com.mycompany.wallpaper.DOIT". 981 * @param x Arbitrary integer argument based on command. 982 * @param y Arbitrary integer argument based on command. 983 * @param z Arbitrary integer argument based on command. 984 * @param extras Optional additional information for the command, or null. 985 */ 986 public void sendWallpaperCommand(IBinder windowToken, String action, 987 int x, int y, int z, Bundle extras) { 988 try { 989 //Log.v(TAG, "Sending new wallpaper offsets from app..."); 990 WindowManagerGlobal.getWindowSession().sendWallpaperCommand( 991 windowToken, action, x, y, z, extras, false); 992 //Log.v(TAG, "...app returning after sending offsets!"); 993 } catch (RemoteException e) { 994 // Ignore. 995 } 996 } 997 998 /** 999 * Clear the offsets previously associated with this window through 1000 * {@link #setWallpaperOffsets(IBinder, float, float)}. This reverts 1001 * the window to its default state, where it does not cause the wallpaper 1002 * to scroll from whatever its last offsets were. 1003 * 1004 * @param windowToken The window who these offsets should be associated 1005 * with, as returned by {@link android.view.View#getWindowToken() 1006 * View.getWindowToken()}. 1007 */ 1008 public void clearWallpaperOffsets(IBinder windowToken) { 1009 try { 1010 WindowManagerGlobal.getWindowSession().setWallpaperPosition( 1011 windowToken, -1, -1, -1, -1); 1012 } catch (RemoteException e) { 1013 // Ignore. 1014 } 1015 } 1016 1017 /** 1018 * Remove any currently set wallpaper, reverting to the system's built-in 1019 * wallpaper. On success, the intent {@link Intent#ACTION_WALLPAPER_CHANGED} 1020 * is broadcast. 1021 * 1022 * <p>This method requires the caller to hold the permission 1023 * {@link android.Manifest.permission#SET_WALLPAPER}. 1024 * 1025 * @throws IOException If an error occurs reverting to the built-in 1026 * wallpaper. 1027 */ 1028 public void clear() throws IOException { 1029 setResource(com.android.internal.R.drawable.default_wallpaper); 1030 } 1031 1032 static Bitmap generateBitmap(Context context, Bitmap bm, int width, int height) { 1033 if (bm == null) { 1034 return null; 1035 } 1036 1037 WindowManager wm = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE); 1038 DisplayMetrics metrics = new DisplayMetrics(); 1039 wm.getDefaultDisplay().getMetrics(metrics); 1040 bm.setDensity(metrics.noncompatDensityDpi); 1041 1042 if (width <= 0 || height <= 0 1043 || (bm.getWidth() == width && bm.getHeight() == height)) { 1044 return bm; 1045 } 1046 1047 // This is the final bitmap we want to return. 1048 try { 1049 Bitmap newbm = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); 1050 newbm.setDensity(metrics.noncompatDensityDpi); 1051 1052 Canvas c = new Canvas(newbm); 1053 Rect targetRect = new Rect(); 1054 targetRect.right = bm.getWidth(); 1055 targetRect.bottom = bm.getHeight(); 1056 1057 int deltaw = width - targetRect.right; 1058 int deltah = height - targetRect.bottom; 1059 1060 if (deltaw > 0 || deltah > 0) { 1061 // We need to scale up so it covers the entire area. 1062 float scale; 1063 if (deltaw > deltah) { 1064 scale = width / (float)targetRect.right; 1065 } else { 1066 scale = height / (float)targetRect.bottom; 1067 } 1068 targetRect.right = (int)(targetRect.right*scale); 1069 targetRect.bottom = (int)(targetRect.bottom*scale); 1070 deltaw = width - targetRect.right; 1071 deltah = height - targetRect.bottom; 1072 } 1073 1074 targetRect.offset(deltaw/2, deltah/2); 1075 1076 Paint paint = new Paint(); 1077 paint.setFilterBitmap(true); 1078 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC)); 1079 c.drawBitmap(bm, null, targetRect, paint); 1080 1081 bm.recycle(); 1082 c.setBitmap(null); 1083 return newbm; 1084 } catch (OutOfMemoryError e) { 1085 Log.w(TAG, "Can't generate default bitmap", e); 1086 return bm; 1087 } 1088 } 1089} 1090