1 /* 2 * Copyright (C) 2006 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 17 package android.widget; 18 19 import static android.os.Build.VERSION_CODES.JELLY_BEAN_MR1; 20 21 import android.content.Context; 22 import android.content.res.TypedArray; 23 import android.graphics.Canvas; 24 import android.graphics.Rect; 25 import android.graphics.drawable.Drawable; 26 import android.os.Parcel; 27 import android.os.Parcelable; 28 import android.util.AttributeSet; 29 import android.view.ContextMenu; 30 import android.view.ContextMenu.ContextMenuInfo; 31 import android.view.SoundEffectConstants; 32 import android.view.View; 33 import android.widget.ExpandableListConnector.PositionMetadata; 34 35 import com.android.internal.R; 36 37 import java.util.ArrayList; 38 39 /** 40 * A view that shows items in a vertically scrolling two-level list. This 41 * differs from the {@link ListView} by allowing two levels: groups which can 42 * individually be expanded to show its children. The items come from the 43 * {@link ExpandableListAdapter} associated with this view. 44 * <p> 45 * Expandable lists are able to show an indicator beside each item to display 46 * the item's current state (the states are usually one of expanded group, 47 * collapsed group, child, or last child). Use 48 * {@link #setChildIndicator(Drawable)} or {@link #setGroupIndicator(Drawable)} 49 * (or the corresponding XML attributes) to set these indicators (see the docs 50 * for each method to see additional state that each Drawable can have). The 51 * default style for an {@link ExpandableListView} provides indicators which 52 * will be shown next to Views given to the {@link ExpandableListView}. The 53 * layouts android.R.layout.simple_expandable_list_item_1 and 54 * android.R.layout.simple_expandable_list_item_2 (which should be used with 55 * {@link SimpleCursorTreeAdapter}) contain the preferred position information 56 * for indicators. 57 * <p> 58 * The context menu information set by an {@link ExpandableListView} will be a 59 * {@link ExpandableListContextMenuInfo} object with 60 * {@link ExpandableListContextMenuInfo#packedPosition} being a packed position 61 * that can be used with {@link #getPackedPositionType(long)} and the other 62 * similar methods. 63 * <p> 64 * <em><b>Note:</b></em> You cannot use the value <code>wrap_content</code> 65 * for the <code>android:layout_height</code> attribute of a 66 * ExpandableListView in XML if the parent's size is also not strictly specified 67 * (for example, if the parent were ScrollView you could not specify 68 * wrap_content since it also can be any length. However, you can use 69 * wrap_content if the ExpandableListView parent has a specific size, such as 70 * 100 pixels. 71 * 72 * @attr ref android.R.styleable#ExpandableListView_groupIndicator 73 * @attr ref android.R.styleable#ExpandableListView_indicatorLeft 74 * @attr ref android.R.styleable#ExpandableListView_indicatorRight 75 * @attr ref android.R.styleable#ExpandableListView_childIndicator 76 * @attr ref android.R.styleable#ExpandableListView_childIndicatorLeft 77 * @attr ref android.R.styleable#ExpandableListView_childIndicatorRight 78 * @attr ref android.R.styleable#ExpandableListView_childDivider 79 * @attr ref android.R.styleable#ExpandableListView_indicatorStart 80 * @attr ref android.R.styleable#ExpandableListView_indicatorEnd 81 * @attr ref android.R.styleable#ExpandableListView_childIndicatorStart 82 * @attr ref android.R.styleable#ExpandableListView_childIndicatorEnd 83 */ 84 public class ExpandableListView extends ListView { 85 86 /** 87 * The packed position represents a group. 88 */ 89 public static final int PACKED_POSITION_TYPE_GROUP = 0; 90 91 /** 92 * The packed position represents a child. 93 */ 94 public static final int PACKED_POSITION_TYPE_CHILD = 1; 95 96 /** 97 * The packed position represents a neither/null/no preference. 98 */ 99 public static final int PACKED_POSITION_TYPE_NULL = 2; 100 101 /** 102 * The value for a packed position that represents neither/null/no 103 * preference. This value is not otherwise possible since a group type 104 * (first bit 0) should not have a child position filled. 105 */ 106 public static final long PACKED_POSITION_VALUE_NULL = 0x00000000FFFFFFFFL; 107 108 /** The mask (in packed position representation) for the child */ 109 private static final long PACKED_POSITION_MASK_CHILD = 0x00000000FFFFFFFFL; 110 111 /** The mask (in packed position representation) for the group */ 112 private static final long PACKED_POSITION_MASK_GROUP = 0x7FFFFFFF00000000L; 113 114 /** The mask (in packed position representation) for the type */ 115 private static final long PACKED_POSITION_MASK_TYPE = 0x8000000000000000L; 116 117 /** The shift amount (in packed position representation) for the group */ 118 private static final long PACKED_POSITION_SHIFT_GROUP = 32; 119 120 /** The shift amount (in packed position representation) for the type */ 121 private static final long PACKED_POSITION_SHIFT_TYPE = 63; 122 123 /** The mask (in integer child position representation) for the child */ 124 private static final long PACKED_POSITION_INT_MASK_CHILD = 0xFFFFFFFF; 125 126 /** The mask (in integer group position representation) for the group */ 127 private static final long PACKED_POSITION_INT_MASK_GROUP = 0x7FFFFFFF; 128 129 /** Serves as the glue/translator between a ListView and an ExpandableListView */ 130 private ExpandableListConnector mConnector; 131 132 /** Gives us Views through group+child positions */ 133 private ExpandableListAdapter mAdapter; 134 135 /** Left bound for drawing the indicator. */ 136 private int mIndicatorLeft; 137 138 /** Right bound for drawing the indicator. */ 139 private int mIndicatorRight; 140 141 /** Start bound for drawing the indicator. */ 142 private int mIndicatorStart; 143 144 /** End bound for drawing the indicator. */ 145 private int mIndicatorEnd; 146 147 /** 148 * Left bound for drawing the indicator of a child. Value of 149 * {@link #CHILD_INDICATOR_INHERIT} means use mIndicatorLeft. 150 */ 151 private int mChildIndicatorLeft; 152 153 /** 154 * Right bound for drawing the indicator of a child. Value of 155 * {@link #CHILD_INDICATOR_INHERIT} means use mIndicatorRight. 156 */ 157 private int mChildIndicatorRight; 158 159 /** 160 * Start bound for drawing the indicator of a child. Value of 161 * {@link #CHILD_INDICATOR_INHERIT} means use mIndicatorStart. 162 */ 163 private int mChildIndicatorStart; 164 165 /** 166 * End bound for drawing the indicator of a child. Value of 167 * {@link #CHILD_INDICATOR_INHERIT} means use mIndicatorEnd. 168 */ 169 private int mChildIndicatorEnd; 170 171 /** 172 * Denotes when a child indicator should inherit this bound from the generic 173 * indicator bounds 174 */ 175 public static final int CHILD_INDICATOR_INHERIT = -1; 176 177 /** 178 * Denotes an undefined value for an indicator 179 */ 180 private static final int INDICATOR_UNDEFINED = -2; 181 182 /** The indicator drawn next to a group. */ 183 private Drawable mGroupIndicator; 184 185 /** The indicator drawn next to a child. */ 186 private Drawable mChildIndicator; 187 188 private static final int[] EMPTY_STATE_SET = {}; 189 190 /** State indicating the group is expanded. */ 191 private static final int[] GROUP_EXPANDED_STATE_SET = 192 {R.attr.state_expanded}; 193 194 /** State indicating the group is empty (has no children). */ 195 private static final int[] GROUP_EMPTY_STATE_SET = 196 {R.attr.state_empty}; 197 198 /** State indicating the group is expanded and empty (has no children). */ 199 private static final int[] GROUP_EXPANDED_EMPTY_STATE_SET = 200 {R.attr.state_expanded, R.attr.state_empty}; 201 202 /** States for the group where the 0th bit is expanded and 1st bit is empty. */ 203 private static final int[][] GROUP_STATE_SETS = { 204 EMPTY_STATE_SET, // 00 205 GROUP_EXPANDED_STATE_SET, // 01 206 GROUP_EMPTY_STATE_SET, // 10 207 GROUP_EXPANDED_EMPTY_STATE_SET // 11 208 }; 209 210 /** State indicating the child is the last within its group. */ 211 private static final int[] CHILD_LAST_STATE_SET = 212 {R.attr.state_last}; 213 214 /** Drawable to be used as a divider when it is adjacent to any children */ 215 private Drawable mChildDivider; 216 217 // Bounds of the indicator to be drawn 218 private final Rect mIndicatorRect = new Rect(); 219 ExpandableListView(Context context)220 public ExpandableListView(Context context) { 221 this(context, null); 222 } 223 ExpandableListView(Context context, AttributeSet attrs)224 public ExpandableListView(Context context, AttributeSet attrs) { 225 this(context, attrs, com.android.internal.R.attr.expandableListViewStyle); 226 } 227 ExpandableListView(Context context, AttributeSet attrs, int defStyleAttr)228 public ExpandableListView(Context context, AttributeSet attrs, int defStyleAttr) { 229 this(context, attrs, defStyleAttr, 0); 230 } 231 ExpandableListView( Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)232 public ExpandableListView( 233 Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 234 super(context, attrs, defStyleAttr, defStyleRes); 235 236 final TypedArray a = context.obtainStyledAttributes(attrs, 237 com.android.internal.R.styleable.ExpandableListView, defStyleAttr, defStyleRes); 238 239 mGroupIndicator = a.getDrawable( 240 com.android.internal.R.styleable.ExpandableListView_groupIndicator); 241 mChildIndicator = a.getDrawable( 242 com.android.internal.R.styleable.ExpandableListView_childIndicator); 243 mIndicatorLeft = a.getDimensionPixelSize( 244 com.android.internal.R.styleable.ExpandableListView_indicatorLeft, 0); 245 mIndicatorRight = a.getDimensionPixelSize( 246 com.android.internal.R.styleable.ExpandableListView_indicatorRight, 0); 247 if (mIndicatorRight == 0 && mGroupIndicator != null) { 248 mIndicatorRight = mIndicatorLeft + mGroupIndicator.getIntrinsicWidth(); 249 } 250 mChildIndicatorLeft = a.getDimensionPixelSize( 251 com.android.internal.R.styleable.ExpandableListView_childIndicatorLeft, 252 CHILD_INDICATOR_INHERIT); 253 mChildIndicatorRight = a.getDimensionPixelSize( 254 com.android.internal.R.styleable.ExpandableListView_childIndicatorRight, 255 CHILD_INDICATOR_INHERIT); 256 mChildDivider = a.getDrawable( 257 com.android.internal.R.styleable.ExpandableListView_childDivider); 258 259 if (!isRtlCompatibilityMode()) { 260 mIndicatorStart = a.getDimensionPixelSize( 261 com.android.internal.R.styleable.ExpandableListView_indicatorStart, 262 INDICATOR_UNDEFINED); 263 mIndicatorEnd = a.getDimensionPixelSize( 264 com.android.internal.R.styleable.ExpandableListView_indicatorEnd, 265 INDICATOR_UNDEFINED); 266 267 mChildIndicatorStart = a.getDimensionPixelSize( 268 com.android.internal.R.styleable.ExpandableListView_childIndicatorStart, 269 CHILD_INDICATOR_INHERIT); 270 mChildIndicatorEnd = a.getDimensionPixelSize( 271 com.android.internal.R.styleable.ExpandableListView_childIndicatorEnd, 272 CHILD_INDICATOR_INHERIT); 273 } 274 275 a.recycle(); 276 } 277 278 /** 279 * Return true if we are in RTL compatibility mode (either before Jelly Bean MR1 or 280 * RTL not supported) 281 */ isRtlCompatibilityMode()282 private boolean isRtlCompatibilityMode() { 283 final int targetSdkVersion = mContext.getApplicationInfo().targetSdkVersion; 284 return targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport(); 285 } 286 287 /** 288 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 289 */ hasRtlSupport()290 private boolean hasRtlSupport() { 291 return mContext.getApplicationInfo().hasRtlSupport(); 292 } 293 onRtlPropertiesChanged(int layoutDirection)294 public void onRtlPropertiesChanged(int layoutDirection) { 295 resolveIndicator(); 296 resolveChildIndicator(); 297 } 298 299 /** 300 * Resolve start/end indicator. start/end indicator always takes precedence over left/right 301 * indicator when defined. 302 */ resolveIndicator()303 private void resolveIndicator() { 304 final boolean isLayoutRtl = isLayoutRtl(); 305 if (isLayoutRtl) { 306 if (mIndicatorStart >= 0) { 307 mIndicatorRight = mIndicatorStart; 308 } 309 if (mIndicatorEnd >= 0) { 310 mIndicatorLeft = mIndicatorEnd; 311 } 312 } else { 313 if (mIndicatorStart >= 0) { 314 mIndicatorLeft = mIndicatorStart; 315 } 316 if (mIndicatorEnd >= 0) { 317 mIndicatorRight = mIndicatorEnd; 318 } 319 } 320 if (mIndicatorRight == 0 && mGroupIndicator != null) { 321 mIndicatorRight = mIndicatorLeft + mGroupIndicator.getIntrinsicWidth(); 322 } 323 } 324 325 /** 326 * Resolve start/end child indicator. start/end child indicator always takes precedence over 327 * left/right child indicator when defined. 328 */ resolveChildIndicator()329 private void resolveChildIndicator() { 330 final boolean isLayoutRtl = isLayoutRtl(); 331 if (isLayoutRtl) { 332 if (mChildIndicatorStart >= CHILD_INDICATOR_INHERIT) { 333 mChildIndicatorRight = mChildIndicatorStart; 334 } 335 if (mChildIndicatorEnd >= CHILD_INDICATOR_INHERIT) { 336 mChildIndicatorLeft = mChildIndicatorEnd; 337 } 338 } else { 339 if (mChildIndicatorStart >= CHILD_INDICATOR_INHERIT) { 340 mChildIndicatorLeft = mChildIndicatorStart; 341 } 342 if (mChildIndicatorEnd >= CHILD_INDICATOR_INHERIT) { 343 mChildIndicatorRight = mChildIndicatorEnd; 344 } 345 } 346 } 347 348 @Override dispatchDraw(Canvas canvas)349 protected void dispatchDraw(Canvas canvas) { 350 // Draw children, etc. 351 super.dispatchDraw(canvas); 352 353 // If we have any indicators to draw, we do it here 354 if ((mChildIndicator == null) && (mGroupIndicator == null)) { 355 return; 356 } 357 358 int saveCount = 0; 359 final boolean clipToPadding = (mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 360 if (clipToPadding) { 361 saveCount = canvas.save(); 362 final int scrollX = mScrollX; 363 final int scrollY = mScrollY; 364 canvas.clipRect(scrollX + mPaddingLeft, scrollY + mPaddingTop, 365 scrollX + mRight - mLeft - mPaddingRight, 366 scrollY + mBottom - mTop - mPaddingBottom); 367 } 368 369 final int headerViewsCount = getHeaderViewsCount(); 370 371 final int lastChildFlPos = mItemCount - getFooterViewsCount() - headerViewsCount - 1; 372 373 final int myB = mBottom; 374 375 PositionMetadata pos; 376 View item; 377 Drawable indicator; 378 int t, b; 379 380 // Start at a value that is neither child nor group 381 int lastItemType = ~(ExpandableListPosition.CHILD | ExpandableListPosition.GROUP); 382 383 final Rect indicatorRect = mIndicatorRect; 384 385 // The "child" mentioned in the following two lines is this 386 // View's child, not referring to an expandable list's 387 // notion of a child (as opposed to a group) 388 final int childCount = getChildCount(); 389 for (int i = 0, childFlPos = mFirstPosition - headerViewsCount; i < childCount; 390 i++, childFlPos++) { 391 392 if (childFlPos < 0) { 393 // This child is header 394 continue; 395 } else if (childFlPos > lastChildFlPos) { 396 // This child is footer, so are all subsequent children 397 break; 398 } 399 400 item = getChildAt(i); 401 t = item.getTop(); 402 b = item.getBottom(); 403 404 // This item isn't on the screen 405 if ((b < 0) || (t > myB)) continue; 406 407 // Get more expandable list-related info for this item 408 pos = mConnector.getUnflattenedPos(childFlPos); 409 410 final boolean isLayoutRtl = isLayoutRtl(); 411 final int width = getWidth(); 412 413 // If this item type and the previous item type are different, then we need to change 414 // the left & right bounds 415 if (pos.position.type != lastItemType) { 416 if (pos.position.type == ExpandableListPosition.CHILD) { 417 indicatorRect.left = (mChildIndicatorLeft == CHILD_INDICATOR_INHERIT) ? 418 mIndicatorLeft : mChildIndicatorLeft; 419 indicatorRect.right = (mChildIndicatorRight == CHILD_INDICATOR_INHERIT) ? 420 mIndicatorRight : mChildIndicatorRight; 421 } else { 422 indicatorRect.left = mIndicatorLeft; 423 indicatorRect.right = mIndicatorRight; 424 } 425 426 if (isLayoutRtl) { 427 final int temp = indicatorRect.left; 428 indicatorRect.left = width - indicatorRect.right; 429 indicatorRect.right = width - temp; 430 431 indicatorRect.left -= mPaddingRight; 432 indicatorRect.right -= mPaddingRight; 433 } else { 434 indicatorRect.left += mPaddingLeft; 435 indicatorRect.right += mPaddingLeft; 436 } 437 438 lastItemType = pos.position.type; 439 } 440 441 if (indicatorRect.left != indicatorRect.right) { 442 // Use item's full height + the divider height 443 if (mStackFromBottom) { 444 // See ListView#dispatchDraw 445 indicatorRect.top = t;// - mDividerHeight; 446 indicatorRect.bottom = b; 447 } else { 448 indicatorRect.top = t; 449 indicatorRect.bottom = b;// + mDividerHeight; 450 } 451 452 // Get the indicator (with its state set to the item's state) 453 indicator = getIndicator(pos); 454 if (indicator != null) { 455 // Draw the indicator 456 indicator.setBounds(indicatorRect); 457 indicator.draw(canvas); 458 } 459 } 460 pos.recycle(); 461 } 462 463 if (clipToPadding) { 464 canvas.restoreToCount(saveCount); 465 } 466 } 467 468 /** 469 * Gets the indicator for the item at the given position. If the indicator 470 * is stateful, the state will be given to the indicator. 471 * 472 * @param pos The flat list position of the item whose indicator 473 * should be returned. 474 * @return The indicator in the proper state. 475 */ getIndicator(PositionMetadata pos)476 private Drawable getIndicator(PositionMetadata pos) { 477 Drawable indicator; 478 479 if (pos.position.type == ExpandableListPosition.GROUP) { 480 indicator = mGroupIndicator; 481 482 if (indicator != null && indicator.isStateful()) { 483 // Empty check based on availability of data. If the groupMetadata isn't null, 484 // we do a check on it. Otherwise, the group is collapsed so we consider it 485 // empty for performance reasons. 486 boolean isEmpty = (pos.groupMetadata == null) || 487 (pos.groupMetadata.lastChildFlPos == pos.groupMetadata.flPos); 488 489 final int stateSetIndex = 490 (pos.isExpanded() ? 1 : 0) | // Expanded? 491 (isEmpty ? 2 : 0); // Empty? 492 indicator.setState(GROUP_STATE_SETS[stateSetIndex]); 493 } 494 } else { 495 indicator = mChildIndicator; 496 497 if (indicator != null && indicator.isStateful()) { 498 // No need for a state sets array for the child since it only has two states 499 final int stateSet[] = pos.position.flatListPos == pos.groupMetadata.lastChildFlPos 500 ? CHILD_LAST_STATE_SET 501 : EMPTY_STATE_SET; 502 indicator.setState(stateSet); 503 } 504 } 505 506 return indicator; 507 } 508 509 /** 510 * Sets the drawable that will be drawn adjacent to every child in the list. This will 511 * be drawn using the same height as the normal divider ({@link #setDivider(Drawable)}) or 512 * if it does not have an intrinsic height, the height set by {@link #setDividerHeight(int)}. 513 * 514 * @param childDivider The drawable to use. 515 */ setChildDivider(Drawable childDivider)516 public void setChildDivider(Drawable childDivider) { 517 mChildDivider = childDivider; 518 } 519 520 @Override drawDivider(Canvas canvas, Rect bounds, int childIndex)521 void drawDivider(Canvas canvas, Rect bounds, int childIndex) { 522 int flatListPosition = childIndex + mFirstPosition; 523 524 // Only proceed as possible child if the divider isn't above all items (if it is above 525 // all items, then the item below it has to be a group) 526 if (flatListPosition >= 0) { 527 final int adjustedPosition = getFlatPositionForConnector(flatListPosition); 528 PositionMetadata pos = mConnector.getUnflattenedPos(adjustedPosition); 529 // If this item is a child, or it is a non-empty group that is expanded 530 if ((pos.position.type == ExpandableListPosition.CHILD) || (pos.isExpanded() && 531 pos.groupMetadata.lastChildFlPos != pos.groupMetadata.flPos)) { 532 // These are the cases where we draw the child divider 533 final Drawable divider = mChildDivider; 534 divider.setBounds(bounds); 535 divider.draw(canvas); 536 pos.recycle(); 537 return; 538 } 539 pos.recycle(); 540 } 541 542 // Otherwise draw the default divider 543 super.drawDivider(canvas, bounds, flatListPosition); 544 } 545 546 /** 547 * This overloaded method should not be used, instead use 548 * {@link #setAdapter(ExpandableListAdapter)}. 549 * <p> 550 * {@inheritDoc} 551 */ 552 @Override setAdapter(ListAdapter adapter)553 public void setAdapter(ListAdapter adapter) { 554 throw new RuntimeException( 555 "For ExpandableListView, use setAdapter(ExpandableListAdapter) instead of " + 556 "setAdapter(ListAdapter)"); 557 } 558 559 /** 560 * This method should not be used, use {@link #getExpandableListAdapter()}. 561 */ 562 @Override getAdapter()563 public ListAdapter getAdapter() { 564 /* 565 * The developer should never really call this method on an 566 * ExpandableListView, so it would be nice to throw a RuntimeException, 567 * but AdapterView calls this 568 */ 569 return super.getAdapter(); 570 } 571 572 /** 573 * Register a callback to be invoked when an item has been clicked and the 574 * caller prefers to receive a ListView-style position instead of a group 575 * and/or child position. In most cases, the caller should use 576 * {@link #setOnGroupClickListener} and/or {@link #setOnChildClickListener}. 577 * <p /> 578 * {@inheritDoc} 579 */ 580 @Override setOnItemClickListener(OnItemClickListener l)581 public void setOnItemClickListener(OnItemClickListener l) { 582 super.setOnItemClickListener(l); 583 } 584 585 /** 586 * Sets the adapter that provides data to this view. 587 * @param adapter The adapter that provides data to this view. 588 */ setAdapter(ExpandableListAdapter adapter)589 public void setAdapter(ExpandableListAdapter adapter) { 590 // Set member variable 591 mAdapter = adapter; 592 593 if (adapter != null) { 594 // Create the connector 595 mConnector = new ExpandableListConnector(adapter); 596 } else { 597 mConnector = null; 598 } 599 600 // Link the ListView (superclass) to the expandable list data through the connector 601 super.setAdapter(mConnector); 602 } 603 604 /** 605 * Gets the adapter that provides data to this view. 606 * @return The adapter that provides data to this view. 607 */ getExpandableListAdapter()608 public ExpandableListAdapter getExpandableListAdapter() { 609 return mAdapter; 610 } 611 612 /** 613 * @param position An absolute (including header and footer) flat list position. 614 * @return true if the position corresponds to a header or a footer item. 615 */ isHeaderOrFooterPosition(int position)616 private boolean isHeaderOrFooterPosition(int position) { 617 final int footerViewsStart = mItemCount - getFooterViewsCount(); 618 return (position < getHeaderViewsCount() || position >= footerViewsStart); 619 } 620 621 /** 622 * Converts an absolute item flat position into a group/child flat position, shifting according 623 * to the number of header items. 624 * 625 * @param flatListPosition The absolute flat position 626 * @return A group/child flat position as expected by the connector. 627 */ getFlatPositionForConnector(int flatListPosition)628 private int getFlatPositionForConnector(int flatListPosition) { 629 return flatListPosition - getHeaderViewsCount(); 630 } 631 632 /** 633 * Converts a group/child flat position into an absolute flat position, that takes into account 634 * the possible headers. 635 * 636 * @param flatListPosition The child/group flat position 637 * @return An absolute flat position. 638 */ getAbsoluteFlatPosition(int flatListPosition)639 private int getAbsoluteFlatPosition(int flatListPosition) { 640 return flatListPosition + getHeaderViewsCount(); 641 } 642 643 @Override performItemClick(View v, int position, long id)644 public boolean performItemClick(View v, int position, long id) { 645 // Ignore clicks in header/footers 646 if (isHeaderOrFooterPosition(position)) { 647 // Clicked on a header/footer, so ignore pass it on to super 648 return super.performItemClick(v, position, id); 649 } 650 651 // Internally handle the item click 652 final int adjustedPosition = getFlatPositionForConnector(position); 653 return handleItemClick(v, adjustedPosition, id); 654 } 655 656 /** 657 * This will either expand/collapse groups (if a group was clicked) or pass 658 * on the click to the proper child (if a child was clicked) 659 * 660 * @param position The flat list position. This has already been factored to 661 * remove the header/footer. 662 * @param id The ListAdapter ID, not the group or child ID. 663 */ handleItemClick(View v, int position, long id)664 boolean handleItemClick(View v, int position, long id) { 665 final PositionMetadata posMetadata = mConnector.getUnflattenedPos(position); 666 667 id = getChildOrGroupId(posMetadata.position); 668 669 boolean returnValue; 670 if (posMetadata.position.type == ExpandableListPosition.GROUP) { 671 /* It's a group, so handle collapsing/expanding */ 672 673 /* It's a group click, so pass on event */ 674 if (mOnGroupClickListener != null) { 675 if (mOnGroupClickListener.onGroupClick(this, v, 676 posMetadata.position.groupPos, id)) { 677 posMetadata.recycle(); 678 return true; 679 } 680 } 681 682 if (posMetadata.isExpanded()) { 683 /* Collapse it */ 684 mConnector.collapseGroup(posMetadata); 685 686 playSoundEffect(SoundEffectConstants.CLICK); 687 688 if (mOnGroupCollapseListener != null) { 689 mOnGroupCollapseListener.onGroupCollapse(posMetadata.position.groupPos); 690 } 691 } else { 692 /* Expand it */ 693 mConnector.expandGroup(posMetadata); 694 695 playSoundEffect(SoundEffectConstants.CLICK); 696 697 if (mOnGroupExpandListener != null) { 698 mOnGroupExpandListener.onGroupExpand(posMetadata.position.groupPos); 699 } 700 701 final int groupPos = posMetadata.position.groupPos; 702 final int groupFlatPos = posMetadata.position.flatListPos; 703 704 final int shiftedGroupPosition = groupFlatPos + getHeaderViewsCount(); 705 smoothScrollToPosition(shiftedGroupPosition + mAdapter.getChildrenCount(groupPos), 706 shiftedGroupPosition); 707 } 708 709 returnValue = true; 710 } else { 711 /* It's a child, so pass on event */ 712 if (mOnChildClickListener != null) { 713 playSoundEffect(SoundEffectConstants.CLICK); 714 return mOnChildClickListener.onChildClick(this, v, posMetadata.position.groupPos, 715 posMetadata.position.childPos, id); 716 } 717 718 returnValue = false; 719 } 720 721 posMetadata.recycle(); 722 723 return returnValue; 724 } 725 726 /** 727 * Expand a group in the grouped list view 728 * 729 * @param groupPos the group to be expanded 730 * @return True if the group was expanded, false otherwise (if the group 731 * was already expanded, this will return false) 732 */ expandGroup(int groupPos)733 public boolean expandGroup(int groupPos) { 734 return expandGroup(groupPos, false); 735 } 736 737 /** 738 * Expand a group in the grouped list view 739 * 740 * @param groupPos the group to be expanded 741 * @param animate true if the expanding group should be animated in 742 * @return True if the group was expanded, false otherwise (if the group 743 * was already expanded, this will return false) 744 */ expandGroup(int groupPos, boolean animate)745 public boolean expandGroup(int groupPos, boolean animate) { 746 ExpandableListPosition elGroupPos = ExpandableListPosition.obtain( 747 ExpandableListPosition.GROUP, groupPos, -1, -1); 748 PositionMetadata pm = mConnector.getFlattenedPos(elGroupPos); 749 elGroupPos.recycle(); 750 boolean retValue = mConnector.expandGroup(pm); 751 752 if (mOnGroupExpandListener != null) { 753 mOnGroupExpandListener.onGroupExpand(groupPos); 754 } 755 756 if (animate) { 757 final int groupFlatPos = pm.position.flatListPos; 758 759 final int shiftedGroupPosition = groupFlatPos + getHeaderViewsCount(); 760 smoothScrollToPosition(shiftedGroupPosition + mAdapter.getChildrenCount(groupPos), 761 shiftedGroupPosition); 762 } 763 pm.recycle(); 764 765 return retValue; 766 } 767 768 /** 769 * Collapse a group in the grouped list view 770 * 771 * @param groupPos position of the group to collapse 772 * @return True if the group was collapsed, false otherwise (if the group 773 * was already collapsed, this will return false) 774 */ collapseGroup(int groupPos)775 public boolean collapseGroup(int groupPos) { 776 boolean retValue = mConnector.collapseGroup(groupPos); 777 778 if (mOnGroupCollapseListener != null) { 779 mOnGroupCollapseListener.onGroupCollapse(groupPos); 780 } 781 782 return retValue; 783 } 784 785 /** Used for being notified when a group is collapsed */ 786 public interface OnGroupCollapseListener { 787 /** 788 * Callback method to be invoked when a group in this expandable list has 789 * been collapsed. 790 * 791 * @param groupPosition The group position that was collapsed 792 */ onGroupCollapse(int groupPosition)793 void onGroupCollapse(int groupPosition); 794 } 795 796 private OnGroupCollapseListener mOnGroupCollapseListener; 797 setOnGroupCollapseListener( OnGroupCollapseListener onGroupCollapseListener)798 public void setOnGroupCollapseListener( 799 OnGroupCollapseListener onGroupCollapseListener) { 800 mOnGroupCollapseListener = onGroupCollapseListener; 801 } 802 803 /** Used for being notified when a group is expanded */ 804 public interface OnGroupExpandListener { 805 /** 806 * Callback method to be invoked when a group in this expandable list has 807 * been expanded. 808 * 809 * @param groupPosition The group position that was expanded 810 */ onGroupExpand(int groupPosition)811 void onGroupExpand(int groupPosition); 812 } 813 814 private OnGroupExpandListener mOnGroupExpandListener; 815 setOnGroupExpandListener( OnGroupExpandListener onGroupExpandListener)816 public void setOnGroupExpandListener( 817 OnGroupExpandListener onGroupExpandListener) { 818 mOnGroupExpandListener = onGroupExpandListener; 819 } 820 821 /** 822 * Interface definition for a callback to be invoked when a group in this 823 * expandable list has been clicked. 824 */ 825 public interface OnGroupClickListener { 826 /** 827 * Callback method to be invoked when a group in this expandable list has 828 * been clicked. 829 * 830 * @param parent The ExpandableListConnector where the click happened 831 * @param v The view within the expandable list/ListView that was clicked 832 * @param groupPosition The group position that was clicked 833 * @param id The row id of the group that was clicked 834 * @return True if the click was handled 835 */ onGroupClick(ExpandableListView parent, View v, int groupPosition, long id)836 boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, 837 long id); 838 } 839 840 private OnGroupClickListener mOnGroupClickListener; 841 setOnGroupClickListener(OnGroupClickListener onGroupClickListener)842 public void setOnGroupClickListener(OnGroupClickListener onGroupClickListener) { 843 mOnGroupClickListener = onGroupClickListener; 844 } 845 846 /** 847 * Interface definition for a callback to be invoked when a child in this 848 * expandable list has been clicked. 849 */ 850 public interface OnChildClickListener { 851 /** 852 * Callback method to be invoked when a child in this expandable list has 853 * been clicked. 854 * 855 * @param parent The ExpandableListView where the click happened 856 * @param v The view within the expandable list/ListView that was clicked 857 * @param groupPosition The group position that contains the child that 858 * was clicked 859 * @param childPosition The child position within the group 860 * @param id The row id of the child that was clicked 861 * @return True if the click was handled 862 */ onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id)863 boolean onChildClick(ExpandableListView parent, View v, int groupPosition, 864 int childPosition, long id); 865 } 866 867 private OnChildClickListener mOnChildClickListener; 868 setOnChildClickListener(OnChildClickListener onChildClickListener)869 public void setOnChildClickListener(OnChildClickListener onChildClickListener) { 870 mOnChildClickListener = onChildClickListener; 871 } 872 873 /** 874 * Converts a flat list position (the raw position of an item (child or group) 875 * in the list) to a group and/or child position (represented in a 876 * packed position). This is useful in situations where the caller needs to 877 * use the underlying {@link ListView}'s methods. Use 878 * {@link ExpandableListView#getPackedPositionType} , 879 * {@link ExpandableListView#getPackedPositionChild}, 880 * {@link ExpandableListView#getPackedPositionGroup} to unpack. 881 * 882 * @param flatListPosition The flat list position to be converted. 883 * @return The group and/or child position for the given flat list position 884 * in packed position representation. #PACKED_POSITION_VALUE_NULL if 885 * the position corresponds to a header or a footer item. 886 */ getExpandableListPosition(int flatListPosition)887 public long getExpandableListPosition(int flatListPosition) { 888 if (isHeaderOrFooterPosition(flatListPosition)) { 889 return PACKED_POSITION_VALUE_NULL; 890 } 891 892 final int adjustedPosition = getFlatPositionForConnector(flatListPosition); 893 PositionMetadata pm = mConnector.getUnflattenedPos(adjustedPosition); 894 long packedPos = pm.position.getPackedPosition(); 895 pm.recycle(); 896 return packedPos; 897 } 898 899 /** 900 * Converts a group and/or child position to a flat list position. This is 901 * useful in situations where the caller needs to use the underlying 902 * {@link ListView}'s methods. 903 * 904 * @param packedPosition The group and/or child positions to be converted in 905 * packed position representation. Use 906 * {@link #getPackedPositionForChild(int, int)} or 907 * {@link #getPackedPositionForGroup(int)}. 908 * @return The flat list position for the given child or group. 909 */ getFlatListPosition(long packedPosition)910 public int getFlatListPosition(long packedPosition) { 911 ExpandableListPosition elPackedPos = ExpandableListPosition 912 .obtainPosition(packedPosition); 913 PositionMetadata pm = mConnector.getFlattenedPos(elPackedPos); 914 elPackedPos.recycle(); 915 final int flatListPosition = pm.position.flatListPos; 916 pm.recycle(); 917 return getAbsoluteFlatPosition(flatListPosition); 918 } 919 920 /** 921 * Gets the position of the currently selected group or child (along with 922 * its type). Can return {@link #PACKED_POSITION_VALUE_NULL} if no selection. 923 * 924 * @return A packed position containing the currently selected group or 925 * child's position and type. #PACKED_POSITION_VALUE_NULL if no selection 926 * or if selection is on a header or a footer item. 927 */ getSelectedPosition()928 public long getSelectedPosition() { 929 final int selectedPos = getSelectedItemPosition(); 930 931 // The case where there is no selection (selectedPos == -1) is also handled here. 932 return getExpandableListPosition(selectedPos); 933 } 934 935 /** 936 * Gets the ID of the currently selected group or child. Can return -1 if no 937 * selection. 938 * 939 * @return The ID of the currently selected group or child. -1 if no 940 * selection. 941 */ getSelectedId()942 public long getSelectedId() { 943 long packedPos = getSelectedPosition(); 944 if (packedPos == PACKED_POSITION_VALUE_NULL) return -1; 945 946 int groupPos = getPackedPositionGroup(packedPos); 947 948 if (getPackedPositionType(packedPos) == PACKED_POSITION_TYPE_GROUP) { 949 // It's a group 950 return mAdapter.getGroupId(groupPos); 951 } else { 952 // It's a child 953 return mAdapter.getChildId(groupPos, getPackedPositionChild(packedPos)); 954 } 955 } 956 957 /** 958 * Sets the selection to the specified group. 959 * @param groupPosition The position of the group that should be selected. 960 */ setSelectedGroup(int groupPosition)961 public void setSelectedGroup(int groupPosition) { 962 ExpandableListPosition elGroupPos = ExpandableListPosition 963 .obtainGroupPosition(groupPosition); 964 PositionMetadata pm = mConnector.getFlattenedPos(elGroupPos); 965 elGroupPos.recycle(); 966 final int absoluteFlatPosition = getAbsoluteFlatPosition(pm.position.flatListPos); 967 super.setSelection(absoluteFlatPosition); 968 pm.recycle(); 969 } 970 971 /** 972 * Sets the selection to the specified child. If the child is in a collapsed 973 * group, the group will only be expanded and child subsequently selected if 974 * shouldExpandGroup is set to true, otherwise the method will return false. 975 * 976 * @param groupPosition The position of the group that contains the child. 977 * @param childPosition The position of the child within the group. 978 * @param shouldExpandGroup Whether the child's group should be expanded if 979 * it is collapsed. 980 * @return Whether the selection was successfully set on the child. 981 */ setSelectedChild(int groupPosition, int childPosition, boolean shouldExpandGroup)982 public boolean setSelectedChild(int groupPosition, int childPosition, boolean shouldExpandGroup) { 983 ExpandableListPosition elChildPos = ExpandableListPosition.obtainChildPosition( 984 groupPosition, childPosition); 985 PositionMetadata flatChildPos = mConnector.getFlattenedPos(elChildPos); 986 987 if (flatChildPos == null) { 988 // The child's group isn't expanded 989 990 // Shouldn't expand the group, so return false for we didn't set the selection 991 if (!shouldExpandGroup) return false; 992 993 expandGroup(groupPosition); 994 995 flatChildPos = mConnector.getFlattenedPos(elChildPos); 996 997 // Sanity check 998 if (flatChildPos == null) { 999 throw new IllegalStateException("Could not find child"); 1000 } 1001 } 1002 1003 int absoluteFlatPosition = getAbsoluteFlatPosition(flatChildPos.position.flatListPos); 1004 super.setSelection(absoluteFlatPosition); 1005 1006 elChildPos.recycle(); 1007 flatChildPos.recycle(); 1008 1009 return true; 1010 } 1011 1012 /** 1013 * Whether the given group is currently expanded. 1014 * 1015 * @param groupPosition The group to check. 1016 * @return Whether the group is currently expanded. 1017 */ isGroupExpanded(int groupPosition)1018 public boolean isGroupExpanded(int groupPosition) { 1019 return mConnector.isGroupExpanded(groupPosition); 1020 } 1021 1022 /** 1023 * Gets the type of a packed position. See 1024 * {@link #getPackedPositionForChild(int, int)}. 1025 * 1026 * @param packedPosition The packed position for which to return the type. 1027 * @return The type of the position contained within the packed position, 1028 * either {@link #PACKED_POSITION_TYPE_CHILD}, {@link #PACKED_POSITION_TYPE_GROUP}, or 1029 * {@link #PACKED_POSITION_TYPE_NULL}. 1030 */ getPackedPositionType(long packedPosition)1031 public static int getPackedPositionType(long packedPosition) { 1032 if (packedPosition == PACKED_POSITION_VALUE_NULL) { 1033 return PACKED_POSITION_TYPE_NULL; 1034 } 1035 1036 return (packedPosition & PACKED_POSITION_MASK_TYPE) == PACKED_POSITION_MASK_TYPE 1037 ? PACKED_POSITION_TYPE_CHILD 1038 : PACKED_POSITION_TYPE_GROUP; 1039 } 1040 1041 /** 1042 * Gets the group position from a packed position. See 1043 * {@link #getPackedPositionForChild(int, int)}. 1044 * 1045 * @param packedPosition The packed position from which the group position 1046 * will be returned. 1047 * @return The group position portion of the packed position. If this does 1048 * not contain a group, returns -1. 1049 */ getPackedPositionGroup(long packedPosition)1050 public static int getPackedPositionGroup(long packedPosition) { 1051 // Null 1052 if (packedPosition == PACKED_POSITION_VALUE_NULL) return -1; 1053 1054 return (int) ((packedPosition & PACKED_POSITION_MASK_GROUP) >> PACKED_POSITION_SHIFT_GROUP); 1055 } 1056 1057 /** 1058 * Gets the child position from a packed position that is of 1059 * {@link #PACKED_POSITION_TYPE_CHILD} type (use {@link #getPackedPositionType(long)}). 1060 * To get the group that this child belongs to, use 1061 * {@link #getPackedPositionGroup(long)}. See 1062 * {@link #getPackedPositionForChild(int, int)}. 1063 * 1064 * @param packedPosition The packed position from which the child position 1065 * will be returned. 1066 * @return The child position portion of the packed position. If this does 1067 * not contain a child, returns -1. 1068 */ getPackedPositionChild(long packedPosition)1069 public static int getPackedPositionChild(long packedPosition) { 1070 // Null 1071 if (packedPosition == PACKED_POSITION_VALUE_NULL) return -1; 1072 1073 // Group since a group type clears this bit 1074 if ((packedPosition & PACKED_POSITION_MASK_TYPE) != PACKED_POSITION_MASK_TYPE) return -1; 1075 1076 return (int) (packedPosition & PACKED_POSITION_MASK_CHILD); 1077 } 1078 1079 /** 1080 * Returns the packed position representation of a child's position. 1081 * <p> 1082 * In general, a packed position should be used in 1083 * situations where the position given to/returned from an 1084 * {@link ExpandableListAdapter} or {@link ExpandableListView} method can 1085 * either be a child or group. The two positions are packed into a single 1086 * long which can be unpacked using 1087 * {@link #getPackedPositionChild(long)}, 1088 * {@link #getPackedPositionGroup(long)}, and 1089 * {@link #getPackedPositionType(long)}. 1090 * 1091 * @param groupPosition The child's parent group's position. 1092 * @param childPosition The child position within the group. 1093 * @return The packed position representation of the child (and parent group). 1094 */ getPackedPositionForChild(int groupPosition, int childPosition)1095 public static long getPackedPositionForChild(int groupPosition, int childPosition) { 1096 return (((long)PACKED_POSITION_TYPE_CHILD) << PACKED_POSITION_SHIFT_TYPE) 1097 | ((((long)groupPosition) & PACKED_POSITION_INT_MASK_GROUP) 1098 << PACKED_POSITION_SHIFT_GROUP) 1099 | (childPosition & PACKED_POSITION_INT_MASK_CHILD); 1100 } 1101 1102 /** 1103 * Returns the packed position representation of a group's position. See 1104 * {@link #getPackedPositionForChild(int, int)}. 1105 * 1106 * @param groupPosition The child's parent group's position. 1107 * @return The packed position representation of the group. 1108 */ getPackedPositionForGroup(int groupPosition)1109 public static long getPackedPositionForGroup(int groupPosition) { 1110 // No need to OR a type in because PACKED_POSITION_GROUP == 0 1111 return ((((long)groupPosition) & PACKED_POSITION_INT_MASK_GROUP) 1112 << PACKED_POSITION_SHIFT_GROUP); 1113 } 1114 1115 @Override createContextMenuInfo(View view, int flatListPosition, long id)1116 ContextMenuInfo createContextMenuInfo(View view, int flatListPosition, long id) { 1117 if (isHeaderOrFooterPosition(flatListPosition)) { 1118 // Return normal info for header/footer view context menus 1119 return new AdapterContextMenuInfo(view, flatListPosition, id); 1120 } 1121 1122 final int adjustedPosition = getFlatPositionForConnector(flatListPosition); 1123 PositionMetadata pm = mConnector.getUnflattenedPos(adjustedPosition); 1124 ExpandableListPosition pos = pm.position; 1125 1126 id = getChildOrGroupId(pos); 1127 long packedPosition = pos.getPackedPosition(); 1128 1129 pm.recycle(); 1130 1131 return new ExpandableListContextMenuInfo(view, packedPosition, id); 1132 } 1133 1134 /** 1135 * Gets the ID of the group or child at the given <code>position</code>. 1136 * This is useful since there is no ListAdapter ID -> ExpandableListAdapter 1137 * ID conversion mechanism (in some cases, it isn't possible). 1138 * 1139 * @param position The position of the child or group whose ID should be 1140 * returned. 1141 */ getChildOrGroupId(ExpandableListPosition position)1142 private long getChildOrGroupId(ExpandableListPosition position) { 1143 if (position.type == ExpandableListPosition.CHILD) { 1144 return mAdapter.getChildId(position.groupPos, position.childPos); 1145 } else { 1146 return mAdapter.getGroupId(position.groupPos); 1147 } 1148 } 1149 1150 /** 1151 * Sets the indicator to be drawn next to a child. 1152 * 1153 * @param childIndicator The drawable to be used as an indicator. If the 1154 * child is the last child for a group, the state 1155 * {@link android.R.attr#state_last} will be set. 1156 */ setChildIndicator(Drawable childIndicator)1157 public void setChildIndicator(Drawable childIndicator) { 1158 mChildIndicator = childIndicator; 1159 } 1160 1161 /** 1162 * Sets the drawing bounds for the child indicator. For either, you can 1163 * specify {@link #CHILD_INDICATOR_INHERIT} to use inherit from the general 1164 * indicator's bounds. 1165 * 1166 * @see #setIndicatorBounds(int, int) 1167 * @param left The left position (relative to the left bounds of this View) 1168 * to start drawing the indicator. 1169 * @param right The right position (relative to the left bounds of this 1170 * View) to end the drawing of the indicator. 1171 */ setChildIndicatorBounds(int left, int right)1172 public void setChildIndicatorBounds(int left, int right) { 1173 mChildIndicatorLeft = left; 1174 mChildIndicatorRight = right; 1175 resolveChildIndicator(); 1176 } 1177 1178 /** 1179 * Sets the relative drawing bounds for the child indicator. For either, you can 1180 * specify {@link #CHILD_INDICATOR_INHERIT} to use inherit from the general 1181 * indicator's bounds. 1182 * 1183 * @see #setIndicatorBounds(int, int) 1184 * @param start The start position (relative to the start bounds of this View) 1185 * to start drawing the indicator. 1186 * @param end The end position (relative to the end bounds of this 1187 * View) to end the drawing of the indicator. 1188 */ setChildIndicatorBoundsRelative(int start, int end)1189 public void setChildIndicatorBoundsRelative(int start, int end) { 1190 mChildIndicatorStart = start; 1191 mChildIndicatorEnd = end; 1192 resolveChildIndicator(); 1193 } 1194 1195 /** 1196 * Sets the indicator to be drawn next to a group. 1197 * 1198 * @param groupIndicator The drawable to be used as an indicator. If the 1199 * group is empty, the state {@link android.R.attr#state_empty} will be 1200 * set. If the group is expanded, the state 1201 * {@link android.R.attr#state_expanded} will be set. 1202 */ setGroupIndicator(Drawable groupIndicator)1203 public void setGroupIndicator(Drawable groupIndicator) { 1204 mGroupIndicator = groupIndicator; 1205 if (mIndicatorRight == 0 && mGroupIndicator != null) { 1206 mIndicatorRight = mIndicatorLeft + mGroupIndicator.getIntrinsicWidth(); 1207 } 1208 } 1209 1210 /** 1211 * Sets the drawing bounds for the indicators (at minimum, the group indicator 1212 * is affected by this; the child indicator is affected by this if the 1213 * child indicator bounds are set to inherit). 1214 * 1215 * @see #setChildIndicatorBounds(int, int) 1216 * @param left The left position (relative to the left bounds of this View) 1217 * to start drawing the indicator. 1218 * @param right The right position (relative to the left bounds of this 1219 * View) to end the drawing of the indicator. 1220 */ setIndicatorBounds(int left, int right)1221 public void setIndicatorBounds(int left, int right) { 1222 mIndicatorLeft = left; 1223 mIndicatorRight = right; 1224 resolveIndicator(); 1225 } 1226 1227 /** 1228 * Sets the relative drawing bounds for the indicators (at minimum, the group indicator 1229 * is affected by this; the child indicator is affected by this if the 1230 * child indicator bounds are set to inherit). 1231 * 1232 * @see #setChildIndicatorBounds(int, int) 1233 * @param start The start position (relative to the start bounds of this View) 1234 * to start drawing the indicator. 1235 * @param end The end position (relative to the end bounds of this 1236 * View) to end the drawing of the indicator. 1237 */ setIndicatorBoundsRelative(int start, int end)1238 public void setIndicatorBoundsRelative(int start, int end) { 1239 mIndicatorStart = start; 1240 mIndicatorEnd = end; 1241 resolveIndicator(); 1242 } 1243 1244 /** 1245 * Extra menu information specific to an {@link ExpandableListView} provided 1246 * to the 1247 * {@link android.view.View.OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo) } 1248 * callback when a context menu is brought up for this AdapterView. 1249 */ 1250 public static class ExpandableListContextMenuInfo implements ContextMenu.ContextMenuInfo { 1251 ExpandableListContextMenuInfo(View targetView, long packedPosition, long id)1252 public ExpandableListContextMenuInfo(View targetView, long packedPosition, long id) { 1253 this.targetView = targetView; 1254 this.packedPosition = packedPosition; 1255 this.id = id; 1256 } 1257 1258 /** 1259 * The view for which the context menu is being displayed. This 1260 * will be one of the children Views of this {@link ExpandableListView}. 1261 */ 1262 public View targetView; 1263 1264 /** 1265 * The packed position in the list represented by the adapter for which 1266 * the context menu is being displayed. Use the methods 1267 * {@link ExpandableListView#getPackedPositionType}, 1268 * {@link ExpandableListView#getPackedPositionChild}, and 1269 * {@link ExpandableListView#getPackedPositionGroup} to unpack this. 1270 */ 1271 public long packedPosition; 1272 1273 /** 1274 * The ID of the item (group or child) for which the context menu is 1275 * being displayed. 1276 */ 1277 public long id; 1278 } 1279 1280 static class SavedState extends BaseSavedState { 1281 ArrayList<ExpandableListConnector.GroupMetadata> expandedGroupMetadataList; 1282 1283 /** 1284 * Constructor called from {@link ExpandableListView#onSaveInstanceState()} 1285 */ SavedState( Parcelable superState, ArrayList<ExpandableListConnector.GroupMetadata> expandedGroupMetadataList)1286 SavedState( 1287 Parcelable superState, 1288 ArrayList<ExpandableListConnector.GroupMetadata> expandedGroupMetadataList) { 1289 super(superState); 1290 this.expandedGroupMetadataList = expandedGroupMetadataList; 1291 } 1292 1293 /** 1294 * Constructor called from {@link #CREATOR} 1295 */ SavedState(Parcel in)1296 private SavedState(Parcel in) { 1297 super(in); 1298 expandedGroupMetadataList = new ArrayList<ExpandableListConnector.GroupMetadata>(); 1299 in.readList(expandedGroupMetadataList, ExpandableListConnector.class.getClassLoader()); 1300 } 1301 1302 @Override writeToParcel(Parcel out, int flags)1303 public void writeToParcel(Parcel out, int flags) { 1304 super.writeToParcel(out, flags); 1305 out.writeList(expandedGroupMetadataList); 1306 } 1307 1308 public static final Parcelable.Creator<SavedState> CREATOR 1309 = new Parcelable.Creator<SavedState>() { 1310 public SavedState createFromParcel(Parcel in) { 1311 return new SavedState(in); 1312 } 1313 1314 public SavedState[] newArray(int size) { 1315 return new SavedState[size]; 1316 } 1317 }; 1318 } 1319 1320 @Override onSaveInstanceState()1321 public Parcelable onSaveInstanceState() { 1322 Parcelable superState = super.onSaveInstanceState(); 1323 return new SavedState(superState, 1324 mConnector != null ? mConnector.getExpandedGroupMetadataList() : null); 1325 } 1326 1327 @Override onRestoreInstanceState(Parcelable state)1328 public void onRestoreInstanceState(Parcelable state) { 1329 if (!(state instanceof SavedState)) { 1330 super.onRestoreInstanceState(state); 1331 return; 1332 } 1333 1334 SavedState ss = (SavedState) state; 1335 super.onRestoreInstanceState(ss.getSuperState()); 1336 1337 if (mConnector != null && ss.expandedGroupMetadataList != null) { 1338 mConnector.setExpandedGroupMetadataList(ss.expandedGroupMetadataList); 1339 } 1340 } 1341 1342 @Override getAccessibilityClassName()1343 public CharSequence getAccessibilityClassName() { 1344 return ExpandableListView.class.getName(); 1345 } 1346 } 1347