WallpaperService.java revision 694f79b5d1196640d1beb680b7d1fc68e6e77cbd
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.service.wallpaper; 18 19import com.android.internal.os.HandlerCaller; 20import com.android.internal.view.BaseIWindow; 21import com.android.internal.view.BaseSurfaceHolder; 22 23import android.annotation.SdkConstant; 24import android.annotation.SdkConstant.SdkConstantType; 25import android.app.Service; 26import android.app.WallpaperManager; 27import android.content.BroadcastReceiver; 28import android.content.Context; 29import android.content.Intent; 30import android.content.IntentFilter; 31import android.content.res.Configuration; 32import android.graphics.Rect; 33import android.os.Bundle; 34import android.os.IBinder; 35import android.os.Looper; 36import android.os.Message; 37import android.os.RemoteException; 38import android.util.Log; 39import android.util.LogPrinter; 40import android.view.Gravity; 41import android.view.IWindowSession; 42import android.view.MotionEvent; 43import android.view.SurfaceHolder; 44import android.view.View; 45import android.view.ViewGroup; 46import android.view.ViewRoot; 47import android.view.WindowManager; 48import android.view.WindowManagerImpl; 49 50import java.util.ArrayList; 51 52/** 53 * A wallpaper service is responsible for showing a live wallpaper behind 54 * applications that would like to sit on top of it. This service object 55 * itself does very little -- its only purpose is to generate instances of 56 * {@link Engine} as needed. Implementing a wallpaper thus 57 * involves subclassing from this, subclassing an Engine implementation, 58 * and implementing {@link #onCreateEngine()} to return a new instance of 59 * your engine. 60 */ 61public abstract class WallpaperService extends Service { 62 /** 63 * The {@link Intent} that must be declared as handled by the service. 64 * To be supported, the service must also require the 65 * {@link android.Manifest.permission#BIND_WALLPAPER} permission so 66 * that other applications can not abuse it. 67 */ 68 @SdkConstant(SdkConstantType.SERVICE_ACTION) 69 public static final String SERVICE_INTERFACE = 70 "android.service.wallpaper.WallpaperService"; 71 72 /** 73 * Name under which a WallpaperService component publishes information 74 * about itself. This meta-data must reference an XML resource containing 75 * a <code><{@link android.R.styleable#Wallpaper wallpaper}></code> 76 * tag. 77 */ 78 public static final String SERVICE_META_DATA = "android.service.wallpaper"; 79 80 static final String TAG = "WallpaperService"; 81 static final boolean DEBUG = false; 82 83 private static final int DO_ATTACH = 10; 84 private static final int DO_DETACH = 20; 85 private static final int DO_SET_DESIRED_SIZE = 30; 86 87 private static final int MSG_UPDATE_SURFACE = 10000; 88 private static final int MSG_VISIBILITY_CHANGED = 10010; 89 private static final int MSG_WALLPAPER_OFFSETS = 10020; 90 private static final int MSG_WALLPAPER_COMMAND = 10025; 91 private static final int MSG_WINDOW_RESIZED = 10030; 92 private static final int MSG_TOUCH_EVENT = 10040; 93 94 private Looper mCallbackLooper; 95 private final ArrayList<Engine> mActiveEngines 96 = new ArrayList<Engine>(); 97 98 static final class WallpaperCommand { 99 String action; 100 int x; 101 int y; 102 int z; 103 Bundle extras; 104 boolean sync; 105 } 106 107 /** 108 * The actual implementation of a wallpaper. A wallpaper service may 109 * have multiple instances running (for example as a real wallpaper 110 * and as a preview), each of which is represented by its own Engine 111 * instance. You must implement {@link WallpaperService#onCreateEngine()} 112 * to return your concrete Engine implementation. 113 */ 114 public class Engine { 115 IWallpaperEngineWrapper mIWallpaperEngine; 116 117 // Copies from mIWallpaperEngine. 118 HandlerCaller mCaller; 119 IWallpaperConnection mConnection; 120 IBinder mWindowToken; 121 122 boolean mInitializing = true; 123 boolean mVisible; 124 boolean mScreenOn = true; 125 boolean mReportedVisible; 126 boolean mDestroyed; 127 128 // Current window state. 129 boolean mCreated; 130 boolean mIsCreating; 131 boolean mDrawingAllowed; 132 int mWidth; 133 int mHeight; 134 int mFormat; 135 int mType; 136 int mCurWidth; 137 int mCurHeight; 138 int mWindowFlags = WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE; 139 int mCurWindowFlags = mWindowFlags; 140 boolean mDestroyReportNeeded; 141 final Rect mVisibleInsets = new Rect(); 142 final Rect mWinFrame = new Rect(); 143 final Rect mContentInsets = new Rect(); 144 final Configuration mConfiguration = new Configuration(); 145 146 final WindowManager.LayoutParams mLayout 147 = new WindowManager.LayoutParams(); 148 IWindowSession mSession; 149 150 final Object mLock = new Object(); 151 boolean mOffsetMessageEnqueued; 152 float mPendingXOffset; 153 float mPendingYOffset; 154 float mPendingXOffsetStep; 155 float mPendingYOffsetStep; 156 boolean mPendingSync; 157 MotionEvent mPendingMove; 158 159 final BroadcastReceiver mReceiver = new BroadcastReceiver() { 160 @Override 161 public void onReceive(Context context, Intent intent) { 162 if (Intent.ACTION_SCREEN_ON.equals(intent.getAction())) { 163 mScreenOn = true; 164 reportVisibility(); 165 } else if (Intent.ACTION_SCREEN_OFF.equals(intent.getAction())) { 166 mScreenOn = false; 167 reportVisibility(); 168 } 169 } 170 }; 171 172 final BaseSurfaceHolder mSurfaceHolder = new BaseSurfaceHolder() { 173 174 @Override 175 public boolean onAllowLockCanvas() { 176 return mDrawingAllowed; 177 } 178 179 @Override 180 public void onRelayoutContainer() { 181 Message msg = mCaller.obtainMessage(MSG_UPDATE_SURFACE); 182 mCaller.sendMessage(msg); 183 } 184 185 @Override 186 public void onUpdateSurface() { 187 Message msg = mCaller.obtainMessage(MSG_UPDATE_SURFACE); 188 mCaller.sendMessage(msg); 189 } 190 191 public boolean isCreating() { 192 return mIsCreating; 193 } 194 195 @Override 196 public void setFixedSize(int width, int height) { 197 throw new UnsupportedOperationException( 198 "Wallpapers currently only support sizing from layout"); 199 } 200 201 public void setKeepScreenOn(boolean screenOn) { 202 throw new UnsupportedOperationException( 203 "Wallpapers do not support keep screen on"); 204 } 205 206 }; 207 208 final BaseIWindow mWindow = new BaseIWindow() { 209 @Override 210 public boolean onDispatchPointer(MotionEvent event, long eventTime, 211 boolean callWhenDone) { 212 synchronized (mLock) { 213 if (event.getAction() == MotionEvent.ACTION_MOVE) { 214 if (mPendingMove != null) { 215 mCaller.removeMessages(MSG_TOUCH_EVENT, mPendingMove); 216 mPendingMove.recycle(); 217 } 218 mPendingMove = event; 219 } else { 220 mPendingMove = null; 221 } 222 Message msg = mCaller.obtainMessageO(MSG_TOUCH_EVENT, 223 event); 224 mCaller.sendMessage(msg); 225 } 226 return false; 227 } 228 229 @Override 230 public void resized(int w, int h, Rect coveredInsets, 231 Rect visibleInsets, boolean reportDraw, Configuration newConfig) { 232 Message msg = mCaller.obtainMessageI(MSG_WINDOW_RESIZED, 233 reportDraw ? 1 : 0); 234 mCaller.sendMessage(msg); 235 } 236 237 @Override 238 public void dispatchAppVisibility(boolean visible) { 239 // We don't do this in preview mode; we'll let the preview 240 // activity tell us when to run. 241 if (!mIWallpaperEngine.mIsPreview) { 242 Message msg = mCaller.obtainMessageI(MSG_VISIBILITY_CHANGED, 243 visible ? 1 : 0); 244 mCaller.sendMessage(msg); 245 } 246 } 247 248 @Override 249 public void dispatchWallpaperOffsets(float x, float y, float xStep, float yStep, 250 boolean sync) { 251 synchronized (mLock) { 252 if (DEBUG) Log.v(TAG, "Dispatch wallpaper offsets: " + x + ", " + y); 253 mPendingXOffset = x; 254 mPendingYOffset = y; 255 mPendingXOffsetStep = xStep; 256 mPendingYOffsetStep = yStep; 257 if (sync) { 258 mPendingSync = true; 259 } 260 if (!mOffsetMessageEnqueued) { 261 mOffsetMessageEnqueued = true; 262 Message msg = mCaller.obtainMessage(MSG_WALLPAPER_OFFSETS); 263 mCaller.sendMessage(msg); 264 } 265 } 266 } 267 268 public void dispatchWallpaperCommand(String action, int x, int y, 269 int z, Bundle extras, boolean sync) { 270 synchronized (mLock) { 271 if (DEBUG) Log.v(TAG, "Dispatch wallpaper command: " + x + ", " + y); 272 WallpaperCommand cmd = new WallpaperCommand(); 273 cmd.action = action; 274 cmd.x = x; 275 cmd.y = y; 276 cmd.z = z; 277 cmd.extras = extras; 278 cmd.sync = sync; 279 Message msg = mCaller.obtainMessage(MSG_WALLPAPER_COMMAND); 280 msg.obj = cmd; 281 mCaller.sendMessage(msg); 282 } 283 } 284 }; 285 286 /** 287 * Provides access to the surface in which this wallpaper is drawn. 288 */ 289 public SurfaceHolder getSurfaceHolder() { 290 return mSurfaceHolder; 291 } 292 293 /** 294 * Convenience for {@link WallpaperManager#getDesiredMinimumWidth() 295 * WallpaperManager.getDesiredMinimumWidth()}, returning the width 296 * that the system would like this wallpaper to run in. 297 */ 298 public int getDesiredMinimumWidth() { 299 return mIWallpaperEngine.mReqWidth; 300 } 301 302 /** 303 * Convenience for {@link WallpaperManager#getDesiredMinimumHeight() 304 * WallpaperManager.getDesiredMinimumHeight()}, returning the height 305 * that the system would like this wallpaper to run in. 306 */ 307 public int getDesiredMinimumHeight() { 308 return mIWallpaperEngine.mReqHeight; 309 } 310 311 /** 312 * Return whether the wallpaper is currently visible to the user, 313 * this is the last value supplied to 314 * {@link #onVisibilityChanged(boolean)}. 315 */ 316 public boolean isVisible() { 317 return mReportedVisible; 318 } 319 320 /** 321 * Returns true if this engine is running in preview mode -- that is, 322 * it is being shown to the user before they select it as the actual 323 * wallpaper. 324 */ 325 public boolean isPreview() { 326 return mIWallpaperEngine.mIsPreview; 327 } 328 329 /** 330 * Control whether this wallpaper will receive raw touch events 331 * from the window manager as the user interacts with the window 332 * that is currently displaying the wallpaper. By default they 333 * are turned off. If enabled, the events will be received in 334 * {@link #onTouchEvent(MotionEvent)}. 335 */ 336 public void setTouchEventsEnabled(boolean enabled) { 337 mWindowFlags = enabled 338 ? (mWindowFlags&~WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE) 339 : (mWindowFlags|WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE); 340 if (mCreated) { 341 updateSurface(false, false); 342 } 343 } 344 345 /** 346 * Called once to initialize the engine. After returning, the 347 * engine's surface will be created by the framework. 348 */ 349 public void onCreate(SurfaceHolder surfaceHolder) { 350 } 351 352 /** 353 * Called right before the engine is going away. After this the 354 * surface will be destroyed and this Engine object is no longer 355 * valid. 356 */ 357 public void onDestroy() { 358 } 359 360 /** 361 * Called to inform you of the wallpaper becoming visible or 362 * hidden. <em>It is very important that a wallpaper only use 363 * CPU while it is visible.</em>. 364 */ 365 public void onVisibilityChanged(boolean visible) { 366 } 367 368 /** 369 * Called as the user performs touch-screen interaction with the 370 * window that is currently showing this wallpaper. Note that the 371 * events you receive here are driven by the actual application the 372 * user is interacting with, so if it is slow you will get fewer 373 * move events. 374 */ 375 public void onTouchEvent(MotionEvent event) { 376 } 377 378 /** 379 * Called to inform you of the wallpaper's offsets changing 380 * within its contain, corresponding to the container's 381 * call to {@link WallpaperManager#setWallpaperOffsets(IBinder, float, float) 382 * WallpaperManager.setWallpaperOffsets()}. 383 */ 384 public void onOffsetsChanged(float xOffset, float yOffset, 385 float xOffsetStep, float yOffsetStep, 386 int xPixelOffset, int yPixelOffset) { 387 } 388 389 /** 390 * Process a command that was sent to the wallpaper with 391 * {@link WallpaperManager#sendWallpaperCommand}. 392 * The default implementation does nothing, and always returns null 393 * as the result. 394 * 395 * @param action The name of the command to perform. This tells you 396 * what to do and how to interpret the rest of the arguments. 397 * @param x Generic integer parameter. 398 * @param y Generic integer parameter. 399 * @param z Generic integer parameter. 400 * @param extras Any additional parameters. 401 * @param resultRequested If true, the caller is requesting that 402 * a result, appropriate for the command, be returned back. 403 * @return If returning a result, create a Bundle and place the 404 * result data in to it. Otherwise return null. 405 */ 406 public Bundle onCommand(String action, int x, int y, int z, 407 Bundle extras, boolean resultRequested) { 408 return null; 409 } 410 411 /** 412 * Called when an application has changed the desired virtual size of 413 * the wallpaper. 414 */ 415 public void onDesiredSizeChanged(int desiredWidth, int desiredHeight) { 416 } 417 418 /** 419 * Convenience for {@link SurfaceHolder.Callback#surfaceChanged 420 * SurfaceHolder.Callback.surfaceChanged()}. 421 */ 422 public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) { 423 } 424 425 /** 426 * Convenience for {@link SurfaceHolder.Callback#surfaceCreated 427 * SurfaceHolder.Callback.surfaceCreated()}. 428 */ 429 public void onSurfaceCreated(SurfaceHolder holder) { 430 } 431 432 /** 433 * Convenience for {@link SurfaceHolder.Callback#surfaceDestroyed 434 * SurfaceHolder.Callback.surfaceDestroyed()}. 435 */ 436 public void onSurfaceDestroyed(SurfaceHolder holder) { 437 } 438 439 void updateSurface(boolean forceRelayout, boolean forceReport) { 440 if (mDestroyed) { 441 Log.w(TAG, "Ignoring updateSurface: destroyed"); 442 } 443 444 int myWidth = mSurfaceHolder.getRequestedWidth(); 445 if (myWidth <= 0) myWidth = ViewGroup.LayoutParams.MATCH_PARENT; 446 int myHeight = mSurfaceHolder.getRequestedHeight(); 447 if (myHeight <= 0) myHeight = ViewGroup.LayoutParams.MATCH_PARENT; 448 449 final boolean creating = !mCreated; 450 final boolean formatChanged = mFormat != mSurfaceHolder.getRequestedFormat(); 451 boolean sizeChanged = mWidth != myWidth || mHeight != myHeight; 452 final boolean typeChanged = mType != mSurfaceHolder.getRequestedType(); 453 final boolean flagsChanged = mCurWindowFlags != mWindowFlags; 454 if (forceRelayout || creating || formatChanged || sizeChanged 455 || typeChanged || flagsChanged) { 456 457 if (DEBUG) Log.v(TAG, "Changes: creating=" + creating 458 + " format=" + formatChanged + " size=" + sizeChanged); 459 460 try { 461 mWidth = myWidth; 462 mHeight = myHeight; 463 mFormat = mSurfaceHolder.getRequestedFormat(); 464 mType = mSurfaceHolder.getRequestedType(); 465 466 mLayout.x = 0; 467 mLayout.y = 0; 468 mLayout.width = myWidth; 469 mLayout.height = myHeight; 470 471 mLayout.format = mFormat; 472 473 mCurWindowFlags = mWindowFlags; 474 mLayout.flags = mWindowFlags 475 | WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS 476 | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN 477 | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE 478 ; 479 480 mLayout.memoryType = mType; 481 mLayout.token = mWindowToken; 482 483 if (!mCreated) { 484 mLayout.type = mIWallpaperEngine.mWindowType; 485 mLayout.gravity = Gravity.LEFT|Gravity.TOP; 486 mLayout.setTitle(WallpaperService.this.getClass().getName()); 487 mLayout.windowAnimations = 488 com.android.internal.R.style.Animation_Wallpaper; 489 mSession.add(mWindow, mLayout, View.VISIBLE, mContentInsets); 490 } 491 492 mSurfaceHolder.mSurfaceLock.lock(); 493 mDrawingAllowed = true; 494 495 final int relayoutResult = mSession.relayout( 496 mWindow, mLayout, mWidth, mHeight, 497 View.VISIBLE, false, mWinFrame, mContentInsets, 498 mVisibleInsets, mConfiguration, mSurfaceHolder.mSurface); 499 500 if (DEBUG) Log.v(TAG, "New surface: " + mSurfaceHolder.mSurface 501 + ", frame=" + mWinFrame); 502 503 int w = mWinFrame.width(); 504 if (mCurWidth != w) { 505 sizeChanged = true; 506 mCurWidth = w; 507 } 508 int h = mWinFrame.height(); 509 if (mCurHeight != h) { 510 sizeChanged = true; 511 mCurHeight = h; 512 } 513 514 mSurfaceHolder.mSurfaceLock.unlock(); 515 516 try { 517 mDestroyReportNeeded = true; 518 519 SurfaceHolder.Callback callbacks[] = null; 520 synchronized (mSurfaceHolder.mCallbacks) { 521 final int N = mSurfaceHolder.mCallbacks.size(); 522 if (N > 0) { 523 callbacks = new SurfaceHolder.Callback[N]; 524 mSurfaceHolder.mCallbacks.toArray(callbacks); 525 } 526 } 527 528 if (!mCreated) { 529 mIsCreating = true; 530 if (DEBUG) Log.v(TAG, "onSurfaceCreated(" 531 + mSurfaceHolder + "): " + this); 532 onSurfaceCreated(mSurfaceHolder); 533 if (callbacks != null) { 534 for (SurfaceHolder.Callback c : callbacks) { 535 c.surfaceCreated(mSurfaceHolder); 536 } 537 } 538 } 539 if (forceReport || creating || formatChanged || sizeChanged) { 540 if (DEBUG) { 541 RuntimeException e = new RuntimeException(); 542 e.fillInStackTrace(); 543 Log.w(TAG, "forceReport=" + forceReport + " creating=" + creating 544 + " formatChanged=" + formatChanged 545 + " sizeChanged=" + sizeChanged, e); 546 } 547 if (DEBUG) Log.v(TAG, "onSurfaceChanged(" 548 + mSurfaceHolder + ", " + mFormat 549 + ", " + mCurWidth + ", " + mCurHeight 550 + "): " + this); 551 onSurfaceChanged(mSurfaceHolder, mFormat, 552 mCurWidth, mCurHeight); 553 if (callbacks != null) { 554 for (SurfaceHolder.Callback c : callbacks) { 555 c.surfaceChanged(mSurfaceHolder, mFormat, 556 mCurWidth, mCurHeight); 557 } 558 } 559 } 560 } finally { 561 mIsCreating = false; 562 mCreated = true; 563 if (creating || (relayoutResult&WindowManagerImpl.RELAYOUT_FIRST_TIME) != 0) { 564 mSession.finishDrawing(mWindow); 565 } 566 } 567 } catch (RemoteException ex) { 568 } 569 if (DEBUG) Log.v( 570 TAG, "Layout: x=" + mLayout.x + " y=" + mLayout.y + 571 " w=" + mLayout.width + " h=" + mLayout.height); 572 } 573 } 574 575 void attach(IWallpaperEngineWrapper wrapper) { 576 if (DEBUG) Log.v(TAG, "attach: " + this + " wrapper=" + wrapper); 577 if (mDestroyed) { 578 return; 579 } 580 581 mIWallpaperEngine = wrapper; 582 mCaller = wrapper.mCaller; 583 mConnection = wrapper.mConnection; 584 mWindowToken = wrapper.mWindowToken; 585 mSurfaceHolder.setSizeFromLayout(); 586 mInitializing = true; 587 mSession = ViewRoot.getWindowSession(getMainLooper()); 588 mWindow.setSession(mSession); 589 590 IntentFilter filter = new IntentFilter(); 591 filter.addAction(Intent.ACTION_SCREEN_ON); 592 filter.addAction(Intent.ACTION_SCREEN_OFF); 593 registerReceiver(mReceiver, filter); 594 595 if (DEBUG) Log.v(TAG, "onCreate(): " + this); 596 onCreate(mSurfaceHolder); 597 598 mInitializing = false; 599 updateSurface(false, false); 600 } 601 602 void doDesiredSizeChanged(int desiredWidth, int desiredHeight) { 603 if (!mDestroyed) { 604 if (DEBUG) Log.v(TAG, "onDesiredSizeChanged(" 605 + desiredWidth + "," + desiredHeight + "): " + this); 606 onDesiredSizeChanged(desiredWidth, desiredHeight); 607 } 608 } 609 610 void doVisibilityChanged(boolean visible) { 611 if (!mDestroyed) { 612 mVisible = visible; 613 reportVisibility(); 614 } 615 } 616 617 void reportVisibility() { 618 if (!mDestroyed) { 619 boolean visible = mVisible && mScreenOn; 620 if (mReportedVisible != visible) { 621 mReportedVisible = visible; 622 if (DEBUG) Log.v(TAG, "onVisibilityChanged(" + visible 623 + "): " + this); 624 onVisibilityChanged(visible); 625 } 626 } 627 } 628 629 void doOffsetsChanged() { 630 if (mDestroyed) { 631 return; 632 } 633 634 float xOffset; 635 float yOffset; 636 float xOffsetStep; 637 float yOffsetStep; 638 boolean sync; 639 synchronized (mLock) { 640 xOffset = mPendingXOffset; 641 yOffset = mPendingYOffset; 642 xOffsetStep = mPendingXOffsetStep; 643 yOffsetStep = mPendingYOffsetStep; 644 sync = mPendingSync; 645 mPendingSync = false; 646 mOffsetMessageEnqueued = false; 647 } 648 if (DEBUG) Log.v(TAG, "Offsets change in " + this 649 + ": " + xOffset + "," + yOffset); 650 final int availw = mIWallpaperEngine.mReqWidth-mCurWidth; 651 final int xPixels = availw > 0 ? -(int)(availw*xOffset+.5f) : 0; 652 final int availh = mIWallpaperEngine.mReqHeight-mCurHeight; 653 final int yPixels = availh > 0 ? -(int)(availh*yOffset+.5f) : 0; 654 onOffsetsChanged(xOffset, yOffset, xOffsetStep, yOffsetStep, xPixels, yPixels); 655 656 if (sync) { 657 try { 658 if (DEBUG) Log.v(TAG, "Reporting offsets change complete"); 659 mSession.wallpaperOffsetsComplete(mWindow.asBinder()); 660 } catch (RemoteException e) { 661 } 662 } 663 } 664 665 void doCommand(WallpaperCommand cmd) { 666 Bundle result; 667 if (!mDestroyed) { 668 result = onCommand(cmd.action, cmd.x, cmd.y, cmd.z, 669 cmd.extras, cmd.sync); 670 } else { 671 result = null; 672 } 673 if (cmd.sync) { 674 try { 675 if (DEBUG) Log.v(TAG, "Reporting command complete"); 676 mSession.wallpaperCommandComplete(mWindow.asBinder(), result); 677 } catch (RemoteException e) { 678 } 679 } 680 } 681 682 void detach() { 683 if (mDestroyed) { 684 return; 685 } 686 687 mDestroyed = true; 688 689 if (mVisible) { 690 mVisible = false; 691 if (DEBUG) Log.v(TAG, "onVisibilityChanged(false): " + this); 692 onVisibilityChanged(false); 693 } 694 695 if (mDestroyReportNeeded) { 696 mDestroyReportNeeded = false; 697 SurfaceHolder.Callback callbacks[]; 698 synchronized (mSurfaceHolder.mCallbacks) { 699 callbacks = new SurfaceHolder.Callback[ 700 mSurfaceHolder.mCallbacks.size()]; 701 mSurfaceHolder.mCallbacks.toArray(callbacks); 702 } 703 for (SurfaceHolder.Callback c : callbacks) { 704 c.surfaceDestroyed(mSurfaceHolder); 705 } 706 if (DEBUG) Log.v(TAG, "onSurfaceDestroyed(" 707 + mSurfaceHolder + "): " + this); 708 onSurfaceDestroyed(mSurfaceHolder); 709 } 710 711 if (DEBUG) Log.v(TAG, "onDestroy(): " + this); 712 onDestroy(); 713 714 unregisterReceiver(mReceiver); 715 716 if (mCreated) { 717 try { 718 mSession.remove(mWindow); 719 } catch (RemoteException e) { 720 } 721 mSurfaceHolder.mSurface.release(); 722 mCreated = false; 723 } 724 } 725 } 726 727 class IWallpaperEngineWrapper extends IWallpaperEngine.Stub 728 implements HandlerCaller.Callback { 729 private final HandlerCaller mCaller; 730 731 final IWallpaperConnection mConnection; 732 final IBinder mWindowToken; 733 final int mWindowType; 734 final boolean mIsPreview; 735 int mReqWidth; 736 int mReqHeight; 737 738 Engine mEngine; 739 740 IWallpaperEngineWrapper(WallpaperService context, 741 IWallpaperConnection conn, IBinder windowToken, 742 int windowType, boolean isPreview, int reqWidth, int reqHeight) { 743 if (DEBUG && mCallbackLooper != null) { 744 mCallbackLooper.setMessageLogging(new LogPrinter(Log.VERBOSE, TAG)); 745 } 746 mCaller = new HandlerCaller(context, 747 mCallbackLooper != null 748 ? mCallbackLooper : context.getMainLooper(), 749 this); 750 mConnection = conn; 751 mWindowToken = windowToken; 752 mWindowType = windowType; 753 mIsPreview = isPreview; 754 mReqWidth = reqWidth; 755 mReqHeight = reqHeight; 756 757 Message msg = mCaller.obtainMessage(DO_ATTACH); 758 mCaller.sendMessage(msg); 759 } 760 761 public void setDesiredSize(int width, int height) { 762 Message msg = mCaller.obtainMessageII(DO_SET_DESIRED_SIZE, width, height); 763 mCaller.sendMessage(msg); 764 } 765 766 public void setVisibility(boolean visible) { 767 Message msg = mCaller.obtainMessageI(MSG_VISIBILITY_CHANGED, 768 visible ? 1 : 0); 769 mCaller.sendMessage(msg); 770 } 771 772 public void dispatchPointer(MotionEvent event) { 773 if (mEngine != null) { 774 mEngine.mWindow.onDispatchPointer(event, event.getEventTime(), false); 775 } 776 } 777 778 public void destroy() { 779 Message msg = mCaller.obtainMessage(DO_DETACH); 780 mCaller.sendMessage(msg); 781 } 782 783 public void executeMessage(Message message) { 784 switch (message.what) { 785 case DO_ATTACH: { 786 try { 787 mConnection.attachEngine(this); 788 } catch (RemoteException e) { 789 Log.w(TAG, "Wallpaper host disappeared", e); 790 return; 791 } 792 Engine engine = onCreateEngine(); 793 mEngine = engine; 794 mActiveEngines.add(engine); 795 engine.attach(this); 796 return; 797 } 798 case DO_DETACH: { 799 mActiveEngines.remove(mEngine); 800 mEngine.detach(); 801 return; 802 } 803 case DO_SET_DESIRED_SIZE: { 804 mEngine.doDesiredSizeChanged(message.arg1, message.arg2); 805 return; 806 } 807 case MSG_UPDATE_SURFACE: 808 mEngine.updateSurface(true, false); 809 break; 810 case MSG_VISIBILITY_CHANGED: 811 if (DEBUG) Log.v(TAG, "Visibility change in " + mEngine 812 + ": " + message.arg1); 813 mEngine.doVisibilityChanged(message.arg1 != 0); 814 break; 815 case MSG_WALLPAPER_OFFSETS: { 816 mEngine.doOffsetsChanged(); 817 } break; 818 case MSG_WALLPAPER_COMMAND: { 819 WallpaperCommand cmd = (WallpaperCommand)message.obj; 820 mEngine.doCommand(cmd); 821 } break; 822 case MSG_WINDOW_RESIZED: { 823 final boolean reportDraw = message.arg1 != 0; 824 mEngine.updateSurface(true, false); 825 mEngine.doOffsetsChanged(); 826 if (reportDraw) { 827 try { 828 mEngine.mSession.finishDrawing(mEngine.mWindow); 829 } catch (RemoteException e) { 830 } 831 } 832 } break; 833 case MSG_TOUCH_EVENT: { 834 MotionEvent ev = (MotionEvent)message.obj; 835 synchronized (mEngine.mLock) { 836 if (mEngine.mPendingMove == ev) { 837 mEngine.mPendingMove = null; 838 } 839 } 840 if (DEBUG) Log.v(TAG, "Delivering touch event: " + ev); 841 mEngine.onTouchEvent(ev); 842 ev.recycle(); 843 } break; 844 default : 845 Log.w(TAG, "Unknown message type " + message.what); 846 } 847 } 848 } 849 850 /** 851 * Implements the internal {@link IWallpaperService} interface to convert 852 * incoming calls to it back to calls on an {@link WallpaperService}. 853 */ 854 class IWallpaperServiceWrapper extends IWallpaperService.Stub { 855 private final WallpaperService mTarget; 856 857 public IWallpaperServiceWrapper(WallpaperService context) { 858 mTarget = context; 859 } 860 861 public void attach(IWallpaperConnection conn, IBinder windowToken, 862 int windowType, boolean isPreview, int reqWidth, int reqHeight) { 863 new IWallpaperEngineWrapper(mTarget, conn, windowToken, 864 windowType, isPreview, reqWidth, reqHeight); 865 } 866 } 867 868 @Override 869 public void onCreate() { 870 super.onCreate(); 871 } 872 873 @Override 874 public void onDestroy() { 875 super.onDestroy(); 876 for (int i=0; i<mActiveEngines.size(); i++) { 877 mActiveEngines.get(i).detach(); 878 } 879 mActiveEngines.clear(); 880 } 881 882 /** 883 * Implement to return the implementation of the internal accessibility 884 * service interface. Subclasses should not override. 885 */ 886 @Override 887 public final IBinder onBind(Intent intent) { 888 return new IWallpaperServiceWrapper(this); 889 } 890 891 /** 892 * This allows subclasses to change the thread that most callbacks 893 * occur on. Currently hidden because it is mostly needed for the 894 * image wallpaper (which runs in the system process and doesn't want 895 * to get stuck running on that seriously in use main thread). Not 896 * exposed right now because the semantics of this are not totally 897 * well defined and some callbacks can still happen on the main thread). 898 * @hide 899 */ 900 public void setCallbackLooper(Looper looper) { 901 mCallbackLooper = looper; 902 } 903 904 /** 905 * Must be implemented to return a new instance of the wallpaper's engine. 906 * Note that multiple instances may be active at the same time, such as 907 * when the wallpaper is currently set as the active wallpaper and the user 908 * is in the wallpaper picker viewing a preview of it as well. 909 */ 910 public abstract Engine onCreateEngine(); 911} 912