AdapterViewAnimator.java revision ef52176f1244a5bb98d82a0c8c7f4351edec17a1
1/* 2 * Copyright (C) 2010 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.widget; 18 19import java.util.ArrayList; 20import java.util.HashMap; 21 22import android.animation.AnimatorInflater; 23import android.animation.ObjectAnimator; 24import android.content.Context; 25import android.content.Intent; 26import android.content.res.TypedArray; 27import android.os.Handler; 28import android.os.Looper; 29import android.os.Parcel; 30import android.os.Parcelable; 31import android.util.AttributeSet; 32import android.view.View; 33import android.view.ViewGroup; 34import android.view.ViewGroup.LayoutParams; 35import android.view.animation.Animation; 36import android.view.animation.AnimationUtils; 37 38/** 39 * Base class for a {@link AdapterView} that will perform animations 40 * when switching between its views. 41 * 42 * @attr ref android.R.styleable#AdapterViewAnimator_inAnimation 43 * @attr ref android.R.styleable#AdapterViewAnimator_outAnimation 44 * @attr ref android.R.styleable#AdapterViewAnimator_animateFirstView 45 * @attr ref android.R.styleable#AdapterViewAnimator_loopViews 46 */ 47public abstract class AdapterViewAnimator extends AdapterView<Adapter> 48 implements RemoteViewsAdapter.RemoteAdapterConnectionCallback { 49 private static final String TAG = "RemoteViewAnimator"; 50 51 /** 52 * The index of the current child, which appears anywhere from the beginning 53 * to the end of the current set of children, as specified by {@link #mActiveOffset} 54 */ 55 int mWhichChild = 0; 56 57 /** 58 * Whether or not the first view(s) should be animated in 59 */ 60 boolean mAnimateFirstTime = true; 61 62 /** 63 * Represents where the in the current window of 64 * views the current <code>mDisplayedChild</code> sits 65 */ 66 int mActiveOffset = 0; 67 68 /** 69 * The number of views that the {@link AdapterViewAnimator} keeps as children at any 70 * given time (not counting views that are pending removal, see {@link #mPreviousViews}). 71 */ 72 int mNumActiveViews = 1; 73 74 /** 75 * Map of the children of the {@link AdapterViewAnimator}. 76 */ 77 private HashMap<Integer, ViewAndIndex> mViewsMap = new HashMap<Integer, ViewAndIndex>(); 78 79 /** 80 * List of views pending removal from the {@link AdapterViewAnimator} 81 */ 82 ArrayList<Integer> mPreviousViews; 83 84 /** 85 * The index, relative to the adapter, of the beginning of the window of views 86 */ 87 int mCurrentWindowStart = 0; 88 89 /** 90 * The index, relative to the adapter, of the end of the window of views 91 */ 92 int mCurrentWindowEnd = -1; 93 94 /** 95 * The same as {@link #mCurrentWindowStart}, except when the we have bounded 96 * {@link #mCurrentWindowStart} to be non-negative 97 */ 98 int mCurrentWindowStartUnbounded = 0; 99 100 /** 101 * Handler to post events to the main thread 102 */ 103 Handler mMainQueue; 104 105 /** 106 * Listens for data changes from the adapter 107 */ 108 AdapterDataSetObserver mDataSetObserver; 109 110 /** 111 * The {@link Adapter} for this {@link AdapterViewAnimator} 112 */ 113 Adapter mAdapter; 114 115 /** 116 * The {@link RemoteViewsAdapter} for this {@link AdapterViewAnimator} 117 */ 118 RemoteViewsAdapter mRemoteViewsAdapter; 119 120 /** 121 * Specifies whether this is the first time the animator is showing views 122 */ 123 boolean mFirstTime = true; 124 125 /** 126 * Specifies if the animator should wrap from 0 to the end and vice versa 127 * or have hard boundaries at the beginning and end 128 */ 129 boolean mLoopViews = true; 130 131 /** 132 * The width and height of some child, used as a size reference in-case our 133 * dimensions are unspecified by the parent. 134 */ 135 int mReferenceChildWidth = -1; 136 int mReferenceChildHeight = -1; 137 138 /** 139 * In and out animations. 140 */ 141 ObjectAnimator<?> mInAnimation; 142 ObjectAnimator<?> mOutAnimation; 143 144 private ArrayList<View> mViewsToBringToFront; 145 146 private static final int DEFAULT_ANIMATION_DURATION = 200; 147 148 public AdapterViewAnimator(Context context) { 149 super(context); 150 initViewAnimator(); 151 } 152 153 public AdapterViewAnimator(Context context, AttributeSet attrs) { 154 super(context, attrs); 155 156 TypedArray a = context.obtainStyledAttributes(attrs, 157 com.android.internal.R.styleable.AdapterViewAnimator); 158 int resource = a.getResourceId( 159 com.android.internal.R.styleable.AdapterViewAnimator_inAnimation, 0); 160 if (resource > 0) { 161 setInAnimation(context, resource); 162 } else { 163 setInAnimation(getDefaultInAnimation()); 164 } 165 166 resource = a.getResourceId(com.android.internal.R.styleable.AdapterViewAnimator_outAnimation, 0); 167 if (resource > 0) { 168 setOutAnimation(context, resource); 169 } else { 170 setOutAnimation(getDefaultOutAnimation()); 171 } 172 173 boolean flag = a.getBoolean( 174 com.android.internal.R.styleable.AdapterViewAnimator_animateFirstView, true); 175 setAnimateFirstView(flag); 176 177 mLoopViews = a.getBoolean( 178 com.android.internal.R.styleable.AdapterViewAnimator_loopViews, false); 179 180 a.recycle(); 181 182 initViewAnimator(); 183 } 184 185 /** 186 * Initialize this {@link AdapterViewAnimator} 187 */ 188 private void initViewAnimator() { 189 mMainQueue = new Handler(Looper.myLooper()); 190 mPreviousViews = new ArrayList<Integer>(); 191 mViewsToBringToFront = new ArrayList<View>(); 192 } 193 194 private class ViewAndIndex { 195 ViewAndIndex(View v, int i) { 196 view = v; 197 index = i; 198 } 199 View view; 200 int index; 201 } 202 203 /** 204 * This method is used by subclasses to configure the animator to display the 205 * desired number of views, and specify the offset 206 * 207 * @param numVisibleViews The number of views the animator keeps in the {@link ViewGroup} 208 * @param activeOffset This parameter specifies where the current index ({@link #mWhichChild}) 209 * sits within the window. For example if activeOffset is 1, and numVisibleViews is 3, 210 * and {@link #setDisplayedChild(int)} is called with 10, then the effective window will 211 * be the indexes 9, 10, and 11. In the same example, if activeOffset were 0, then the 212 * window would instead contain indexes 10, 11 and 12. 213 * @param shouldLoop If the animator is show view 0, and setPrevious() is called, do we 214 * we loop back to the end, or do we do nothing 215 */ 216 void configureViewAnimator(int numVisibleViews, int activeOffset) { 217 if (activeOffset > numVisibleViews - 1) { 218 // Throw an exception here. 219 } 220 mNumActiveViews = numVisibleViews; 221 mActiveOffset = activeOffset; 222 mPreviousViews.clear(); 223 mViewsMap.clear(); 224 removeAllViewsInLayout(); 225 mCurrentWindowStart = 0; 226 mCurrentWindowEnd = -1; 227 } 228 229 /** 230 * This class should be overridden by subclasses to customize view transitions within 231 * the set of visible views 232 * 233 * @param fromIndex The relative index within the window that the view was in, -1 if it wasn't 234 * in the window 235 * @param toIndex The relative index within the window that the view is going to, -1 if it is 236 * being removed 237 * @param view The view that is being animated 238 */ 239 void animateViewForTransition(int fromIndex, int toIndex, View view) { 240 if (fromIndex == -1) { 241 mInAnimation.setTarget(view); 242 mInAnimation.start(); 243 } else if (toIndex == -1) { 244 mOutAnimation.setTarget(view); 245 mOutAnimation.start(); 246 } 247 } 248 249 ObjectAnimator<?> getDefaultInAnimation() { 250 return new ObjectAnimator<Float>(DEFAULT_ANIMATION_DURATION, null, "alpha", 0.0f, 1.0f); 251 } 252 253 ObjectAnimator<?> getDefaultOutAnimation() { 254 return new ObjectAnimator<Float>(DEFAULT_ANIMATION_DURATION, null, "alpha", 1.0f, 0.0f); 255 } 256 257 /** 258 * Sets which child view will be displayed. 259 * 260 * @param whichChild the index of the child view to display 261 */ 262 public void setDisplayedChild(int whichChild) { 263 if (mAdapter != null) { 264 mWhichChild = whichChild; 265 if (whichChild >= mAdapter.getCount()) { 266 mWhichChild = mLoopViews ? 0 : mAdapter.getCount() - 1; 267 } else if (whichChild < 0) { 268 mWhichChild = mLoopViews ? mAdapter.getCount() - 1 : 0; 269 } 270 271 boolean hasFocus = getFocusedChild() != null; 272 // This will clear old focus if we had it 273 showOnly(mWhichChild); 274 if (hasFocus) { 275 // Try to retake focus if we had it 276 requestFocus(FOCUS_FORWARD); 277 } 278 } 279 } 280 281 /** 282 * To be overridden by subclasses. This method applies a view / index specific 283 * transform to the child view. 284 * 285 * @param child 286 * @param relativeIndex 287 */ 288 void applyTransformForChildAtIndex(View child, int relativeIndex) { 289 } 290 291 /** 292 * Returns the index of the currently displayed child view. 293 */ 294 public int getDisplayedChild() { 295 return mWhichChild; 296 } 297 298 /** 299 * Manually shows the next child. 300 */ 301 public void showNext() { 302 setDisplayedChild(mWhichChild + 1); 303 } 304 305 /** 306 * Manually shows the previous child. 307 */ 308 public void showPrevious() { 309 setDisplayedChild(mWhichChild - 1); 310 } 311 312 /** 313 * Shows only the specified child. The other displays Views exit the screen, 314 * optionally with the with the {@link #getOutAnimation() out animation} and 315 * the specified child enters the screen, optionally with the 316 * {@link #getInAnimation() in animation}. 317 * 318 * @param childIndex The index of the child to be shown. 319 * @param animate Whether or not to use the in and out animations, defaults 320 * to true. 321 */ 322 void showOnly(int childIndex, boolean animate) { 323 showOnly(childIndex, animate, false); 324 } 325 326 private int modulo(int pos, int size) { 327 return (size + (pos % size)) % size; 328 } 329 330 /** 331 * Get the view at this index relative to the current window's start 332 * 333 * @param relativeIndex Position relative to the current window's start 334 * @return View at this index, null if the index is outside the bounds 335 */ 336 View getViewAtRelativeIndex(int relativeIndex) { 337 if (relativeIndex >= 0 && relativeIndex <= mNumActiveViews - 1 && mAdapter != null) { 338 int adapterCount = mAdapter.getCount(); 339 int i = modulo(mCurrentWindowStartUnbounded + relativeIndex, adapterCount); 340 return mViewsMap.get(i).view; 341 } 342 return null; 343 } 344 345 LayoutParams createOrReuseLayoutParams(View v) { 346 final ViewGroup.LayoutParams currentLp = v.getLayoutParams(); 347 if (currentLp instanceof ViewGroup.LayoutParams) { 348 LayoutParams lp = (LayoutParams) currentLp; 349 return lp; 350 } 351 return new ViewGroup.LayoutParams(0, 0); 352 } 353 354 void refreshChildren() { 355 for (int i = mCurrentWindowStart; i <= mCurrentWindowEnd; i++) { 356 int index = modulo(i, mNumActiveViews); 357 358 // get the fresh child from the adapter 359 View updatedChild = mAdapter.getView(i, null, this); 360 361 if (mViewsMap.containsKey(index)) { 362 FrameLayout fl = (FrameLayout) mViewsMap.get(index).view; 363 // flush out the old child 364 fl.removeAllViewsInLayout(); 365 // add the new child to the frame, if it exists 366 if (updatedChild != null) { 367 fl.addView(updatedChild); 368 } 369 } 370 } 371 } 372 373 /** 374 * This method can be overridden so that subclasses can provide a custom frame in which their 375 * children can live. For example, StackView adds padding to its childrens' frames so as to 376 * accomodate for the highlight effect. 377 * 378 * @return The FrameLayout into which children can be placed. 379 */ 380 FrameLayout getFrameForChild() { 381 return new FrameLayout(mContext); 382 } 383 384 void showOnly(int childIndex, boolean animate, boolean onLayout) { 385 if (mAdapter == null) return; 386 387 for (int i = 0; i < mPreviousViews.size(); i++) { 388 View viewToRemove = mViewsMap.get(mPreviousViews.get(i)).view; 389 mViewsMap.remove(mPreviousViews.get(i)); 390 viewToRemove.clearAnimation(); 391 if (viewToRemove instanceof ViewGroup) { 392 ViewGroup vg = (ViewGroup) viewToRemove; 393 vg.removeAllViewsInLayout(); 394 } 395 // applyTransformForChildAtIndex here just allows for any cleanup 396 // associated with this view that may need to be done by a subclass 397 applyTransformForChildAtIndex(viewToRemove, -1); 398 399 removeViewInLayout(viewToRemove); 400 } 401 mPreviousViews.clear(); 402 int adapterCount = mAdapter.getCount(); 403 int newWindowStartUnbounded = childIndex - mActiveOffset; 404 int newWindowEndUnbounded = newWindowStartUnbounded + mNumActiveViews - 1; 405 int newWindowStart = Math.max(0, newWindowStartUnbounded); 406 int newWindowEnd = Math.min(adapterCount - 1, newWindowEndUnbounded); 407 408 if (mLoopViews) { 409 newWindowStart = newWindowStartUnbounded; 410 newWindowEnd = newWindowEndUnbounded; 411 } 412 int rangeStart = modulo(newWindowStart, adapterCount); 413 int rangeEnd = modulo(newWindowEnd, adapterCount); 414 415 boolean wrap = false; 416 if (rangeStart > rangeEnd) { 417 wrap = true; 418 } 419 420 // This section clears out any items that are in our active views list 421 // but are outside the effective bounds of our window (this is becomes an issue 422 // at the extremities of the list, eg. where newWindowStartUnbounded < 0 or 423 // newWindowEndUnbounded > mAdapter.getCount() - 1 424 for (Integer index : mViewsMap.keySet()) { 425 boolean remove = false; 426 if (!wrap && (index < rangeStart || index > rangeEnd)) { 427 remove = true; 428 } else if (wrap && (index > rangeEnd && index < rangeStart)) { 429 remove = true; 430 } 431 432 if (remove) { 433 View previousView = mViewsMap.get(index).view; 434 int oldRelativeIndex = mViewsMap.get(index).index; 435 436 mPreviousViews.add(index); 437 animateViewForTransition(oldRelativeIndex, -1, previousView); 438 } 439 } 440 441 // If the window has changed 442 if (!(newWindowStart == mCurrentWindowStart && newWindowEnd == mCurrentWindowEnd)) { 443 // Run through the indices in the new range 444 for (int i = newWindowStart; i <= newWindowEnd; i++) { 445 446 int index = modulo(i, adapterCount); 447 int oldRelativeIndex; 448 if (mViewsMap.containsKey(index)) { 449 oldRelativeIndex = mViewsMap.get(index).index; 450 } else { 451 oldRelativeIndex = -1; 452 } 453 int newRelativeIndex = i - newWindowStartUnbounded; 454 455 // If this item is in the current window, great, we just need to apply 456 // the transform for it's new relative position in the window, and animate 457 // between it's current and new relative positions 458 boolean inOldRange = mViewsMap.containsKey(index) && !mPreviousViews.contains(index); 459 460 if (inOldRange) { 461 View view = mViewsMap.get(index).view; 462 mViewsMap.get(index).index = newRelativeIndex; 463 applyTransformForChildAtIndex(view, newRelativeIndex); 464 animateViewForTransition(oldRelativeIndex, newRelativeIndex, view); 465 466 // Otherwise this view is new to the window 467 } else { 468 // Get the new view from the adapter, add it and apply any transform / animation 469 View newView = mAdapter.getView(modulo(i, adapterCount), null, this); 470 471 // We wrap the new view in a FrameLayout so as to respect the contract 472 // with the adapter, that is, that we don't modify this view directly 473 FrameLayout fl = getFrameForChild(); 474 475 // If the view from the adapter is null, we still keep an empty frame in place 476 if (newView != null) { 477 fl.addView(newView); 478 } 479 mViewsMap.put(index, new ViewAndIndex(fl, newRelativeIndex)); 480 addChild(fl); 481 applyTransformForChildAtIndex(fl, newRelativeIndex); 482 animateViewForTransition(-1, newRelativeIndex, fl); 483 } 484 mViewsMap.get(index).view.bringToFront(); 485 } 486 487 for (int i = 0; i < mViewsToBringToFront.size(); i++) { 488 View v = mViewsToBringToFront.get(i); 489 v.bringToFront(); 490 } 491 mViewsToBringToFront.clear(); 492 493 mCurrentWindowStart = newWindowStart; 494 mCurrentWindowEnd = newWindowEnd; 495 mCurrentWindowStartUnbounded = newWindowStartUnbounded; 496 } 497 498 mFirstTime = false; 499 if (!onLayout) { 500 requestLayout(); 501 invalidate(); 502 } else { 503 // If the Adapter tries to layout the current view when we get it using getView 504 // above the layout will end up being ignored since we are currently laying out, so 505 // we post a delayed requestLayout and invalidate 506 mMainQueue.post(new Runnable() { 507 @Override 508 public void run() { 509 requestLayout(); 510 invalidate(); 511 } 512 }); 513 } 514 } 515 516 private void addChild(View child) { 517 addViewInLayout(child, -1, createOrReuseLayoutParams(child)); 518 519 // This code is used to obtain a reference width and height of a child in case we need 520 // to decide our own size. TODO: Do we want to update the size of the child that we're 521 // using for reference size? If so, when? 522 if (mReferenceChildWidth == -1 || mReferenceChildHeight == -1) { 523 int measureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); 524 child.measure(measureSpec, measureSpec); 525 mReferenceChildWidth = child.getMeasuredWidth(); 526 mReferenceChildHeight = child.getMeasuredHeight(); 527 } 528 } 529 530 private void measureChildren() { 531 final int count = getChildCount(); 532 final int childWidth = mMeasuredWidth - mPaddingLeft - mPaddingRight; 533 final int childHeight = mMeasuredHeight - mPaddingTop - mPaddingBottom; 534 535 for (int i = 0; i < count; i++) { 536 final View child = getChildAt(i); 537 child.measure(MeasureSpec.makeMeasureSpec(childWidth, MeasureSpec.EXACTLY), 538 MeasureSpec.makeMeasureSpec(childHeight, MeasureSpec.EXACTLY)); 539 } 540 } 541 542 @Override 543 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 544 int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec); 545 int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec); 546 final int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec); 547 final int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec); 548 549 boolean haveChildRefSize = (mReferenceChildWidth != -1 && mReferenceChildHeight != -1); 550 551 // We need to deal with the case where our parent hasn't told us how 552 // big we should be. In this case we try to use the desired size of the first 553 // child added. 554 if (heightSpecMode == MeasureSpec.UNSPECIFIED) { 555 heightSpecSize = haveChildRefSize ? mReferenceChildHeight + mPaddingTop + 556 mPaddingBottom : 0; 557 } else if (heightSpecMode == MeasureSpec.AT_MOST) { 558 heightSpecSize = haveChildRefSize ? Math.min(mReferenceChildHeight + mPaddingTop + 559 mPaddingBottom, heightSpecSize) : 0; 560 } 561 562 if (widthSpecMode == MeasureSpec.UNSPECIFIED) { 563 widthSpecSize = haveChildRefSize ? mReferenceChildWidth + mPaddingLeft + 564 mPaddingRight : 0; 565 } else if (heightSpecMode == MeasureSpec.AT_MOST) { 566 widthSpecSize = haveChildRefSize ? Math.min(mReferenceChildWidth + mPaddingLeft + 567 mPaddingRight, widthSpecSize) : 0; 568 } 569 570 setMeasuredDimension(widthSpecSize, heightSpecSize); 571 measureChildren(); 572 } 573 574 @Override 575 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 576 boolean dataChanged = mDataChanged; 577 if (dataChanged) { 578 handleDataChanged(); 579 580 // if the data changes, mWhichChild might be out of the bounds of the adapter 581 // in this case, we reset mWhichChild to the beginning 582 if (mWhichChild >= mAdapter.getCount()) { 583 mWhichChild = 0; 584 585 showOnly(mWhichChild, true, true); 586 } 587 refreshChildren(); 588 } 589 590 final int childCount = getChildCount(); 591 for (int i = 0; i < childCount; i++) { 592 final View child = getChildAt(i); 593 594 int childRight = mPaddingLeft + child.getMeasuredWidth(); 595 int childBottom = mPaddingTop + child.getMeasuredHeight(); 596 597 child.layout(mPaddingLeft, mPaddingTop, childRight, childBottom); 598 } 599 mDataChanged = false; 600 } 601 602 static class SavedState extends BaseSavedState { 603 int whichChild; 604 605 /** 606 * Constructor called from {@link AdapterViewAnimator#onSaveInstanceState()} 607 */ 608 SavedState(Parcelable superState, int whichChild) { 609 super(superState); 610 this.whichChild = whichChild; 611 } 612 613 /** 614 * Constructor called from {@link #CREATOR} 615 */ 616 private SavedState(Parcel in) { 617 super(in); 618 this.whichChild = in.readInt(); 619 } 620 621 @Override 622 public void writeToParcel(Parcel out, int flags) { 623 super.writeToParcel(out, flags); 624 out.writeInt(this.whichChild); 625 } 626 627 @Override 628 public String toString() { 629 return "AdapterViewAnimator.SavedState{ whichChild = " + this.whichChild + " }"; 630 } 631 632 public static final Parcelable.Creator<SavedState> CREATOR 633 = new Parcelable.Creator<SavedState>() { 634 public SavedState createFromParcel(Parcel in) { 635 return new SavedState(in); 636 } 637 638 public SavedState[] newArray(int size) { 639 return new SavedState[size]; 640 } 641 }; 642 } 643 644 @Override 645 public Parcelable onSaveInstanceState() { 646 Parcelable superState = super.onSaveInstanceState(); 647 return new SavedState(superState, mWhichChild); 648 } 649 650 @Override 651 public void onRestoreInstanceState(Parcelable state) { 652 SavedState ss = (SavedState) state; 653 super.onRestoreInstanceState(ss.getSuperState()); 654 655 // Here we set mWhichChild in addition to setDisplayedChild 656 // We do the former in case mAdapter is null, and hence setDisplayedChild won't 657 // set mWhichChild 658 mWhichChild = ss.whichChild; 659 setDisplayedChild(mWhichChild); 660 } 661 662 /** 663 * Shows only the specified child. The other displays Views exit the screen 664 * with the {@link #getOutAnimation() out animation} and the specified child 665 * enters the screen with the {@link #getInAnimation() in animation}. 666 * 667 * @param childIndex The index of the child to be shown. 668 */ 669 void showOnly(int childIndex) { 670 final boolean animate = (!mFirstTime || mAnimateFirstTime); 671 showOnly(childIndex, animate); 672 } 673 674 /** 675 * Returns the View corresponding to the currently displayed child. 676 * 677 * @return The View currently displayed. 678 * 679 * @see #getDisplayedChild() 680 */ 681 public View getCurrentView() { 682 return getViewAtRelativeIndex(mActiveOffset); 683 } 684 685 /** 686 * Returns the current animation used to animate a View that enters the screen. 687 * 688 * @return An Animation or null if none is set. 689 * 690 * @see #setInAnimation(android.view.animation.Animation) 691 * @see #setInAnimation(android.content.Context, int) 692 */ 693 public ObjectAnimator<?> getInAnimation() { 694 return mInAnimation; 695 } 696 697 /** 698 * Specifies the animation used to animate a View that enters the screen. 699 * 700 * @param inAnimation The animation started when a View enters the screen. 701 * 702 * @see #getInAnimation() 703 * @see #setInAnimation(android.content.Context, int) 704 */ 705 public void setInAnimation(ObjectAnimator<?> inAnimation) { 706 mInAnimation = inAnimation; 707 } 708 709 /** 710 * Returns the current animation used to animate a View that exits the screen. 711 * 712 * @return An Animation or null if none is set. 713 * 714 * @see #setOutAnimation(android.view.animation.Animation) 715 * @see #setOutAnimation(android.content.Context, int) 716 */ 717 public ObjectAnimator<?> getOutAnimation() { 718 return mOutAnimation; 719 } 720 721 /** 722 * Specifies the animation used to animate a View that exit the screen. 723 * 724 * @param outAnimation The animation started when a View exit the screen. 725 * 726 * @see #getOutAnimation() 727 * @see #setOutAnimation(android.content.Context, int) 728 */ 729 public void setOutAnimation(ObjectAnimator<?> outAnimation) { 730 mOutAnimation = outAnimation; 731 } 732 733 /** 734 * Specifies the animation used to animate a View that enters the screen. 735 * 736 * @param context The application's environment. 737 * @param resourceID The resource id of the animation. 738 * 739 * @see #getInAnimation() 740 * @see #setInAnimation(android.view.animation.Animation) 741 */ 742 public void setInAnimation(Context context, int resourceID) { 743 setInAnimation((ObjectAnimator<?>) AnimatorInflater.loadAnimator(context, resourceID)); 744 } 745 746 /** 747 * Specifies the animation used to animate a View that exit the screen. 748 * 749 * @param context The application's environment. 750 * @param resourceID The resource id of the animation. 751 * 752 * @see #getOutAnimation() 753 * @see #setOutAnimation(android.view.animation.Animation) 754 */ 755 public void setOutAnimation(Context context, int resourceID) { 756 setOutAnimation((ObjectAnimator<?>) AnimatorInflater.loadAnimator(context, resourceID)); 757 } 758 759 /** 760 * Indicates whether the current View should be animated the first time 761 * the ViewAnimation is displayed. 762 * 763 * @param animate True to animate the current View the first time it is displayed, 764 * false otherwise. 765 */ 766 public void setAnimateFirstView(boolean animate) { 767 mAnimateFirstTime = animate; 768 } 769 770 @Override 771 public int getBaseline() { 772 return (getCurrentView() != null) ? getCurrentView().getBaseline() : super.getBaseline(); 773 } 774 775 @Override 776 public Adapter getAdapter() { 777 return mAdapter; 778 } 779 780 @Override 781 public void setAdapter(Adapter adapter) { 782 if (mAdapter != null && mDataSetObserver != null) { 783 mAdapter.unregisterDataSetObserver(mDataSetObserver); 784 } 785 786 mAdapter = adapter; 787 checkFocus(); 788 789 if (mAdapter != null) { 790 mDataSetObserver = new AdapterDataSetObserver(); 791 mAdapter.registerDataSetObserver(mDataSetObserver); 792 } 793 setFocusable(true); 794 } 795 796 /** 797 * Sets up this AdapterViewAnimator to use a remote views adapter which connects to a 798 * RemoteViewsService through the specified intent. 799 * 800 * @param intent the intent used to identify the RemoteViewsService for the adapter to 801 * connect to. 802 */ 803 @android.view.RemotableViewMethod 804 public void setRemoteViewsAdapter(Intent intent) { 805 // Ensure that we don't already have a RemoteViewsAdapter that is bound to an existing 806 // service handling the specified intent. 807 if (mRemoteViewsAdapter != null) { 808 Intent.FilterComparison fcNew = new Intent.FilterComparison(intent); 809 Intent.FilterComparison fcOld = new Intent.FilterComparison( 810 mRemoteViewsAdapter.getRemoteViewsServiceIntent()); 811 if (fcNew.equals(fcOld)) { 812 return; 813 } 814 } 815 816 // Otherwise, create a new RemoteViewsAdapter for binding 817 mRemoteViewsAdapter = new RemoteViewsAdapter(getContext(), intent, this); 818 } 819 820 @Override 821 public void setSelection(int position) { 822 setDisplayedChild(position); 823 } 824 825 @Override 826 public View getSelectedView() { 827 return getViewAtRelativeIndex(mActiveOffset); 828 } 829 830 /** 831 * Called back when the adapter connects to the RemoteViewsService. 832 */ 833 public void onRemoteAdapterConnected() { 834 if (mRemoteViewsAdapter != mAdapter) { 835 setAdapter(mRemoteViewsAdapter); 836 } 837 } 838 839 /** 840 * Called back when the adapter disconnects from the RemoteViewsService. 841 */ 842 public void onRemoteAdapterDisconnected() { 843 if (mRemoteViewsAdapter != mAdapter) { 844 mRemoteViewsAdapter = null; 845 setAdapter(mRemoteViewsAdapter); 846 } 847 } 848} 849