NumberPicker.java revision 156f20919b3d5f298f8851215adbf65f8b4dc61b
1/* 2 * Copyright (C) 2008 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 com.android.internal.R; 20 21import android.animation.Animator; 22import android.animation.AnimatorListenerAdapter; 23import android.animation.AnimatorSet; 24import android.animation.ObjectAnimator; 25import android.animation.ValueAnimator; 26import android.annotation.Widget; 27import android.content.Context; 28import android.content.res.ColorStateList; 29import android.content.res.TypedArray; 30import android.graphics.Canvas; 31import android.graphics.Color; 32import android.graphics.Paint; 33import android.graphics.Rect; 34import android.graphics.Paint.Align; 35import android.graphics.drawable.Drawable; 36import android.text.InputFilter; 37import android.text.InputType; 38import android.text.Spanned; 39import android.text.TextUtils; 40import android.text.method.NumberKeyListener; 41import android.util.AttributeSet; 42import android.util.SparseArray; 43import android.util.TypedValue; 44import android.view.KeyEvent; 45import android.view.LayoutInflater; 46import android.view.MotionEvent; 47import android.view.VelocityTracker; 48import android.view.View; 49import android.view.ViewConfiguration; 50import android.view.LayoutInflater.Filter; 51import android.view.animation.DecelerateInterpolator; 52import android.view.inputmethod.InputMethodManager; 53 54/** 55 * A widget that enables the user to select a number form a predefined range. 56 * The widget presents an input filed and up and down buttons for selecting the 57 * current value. Pressing/long pressing the up and down buttons increments and 58 * decrements the current value respectively. Touching the input filed shows a 59 * scroll wheel, tapping on which while shown and not moving allows direct edit 60 * of the current value. Sliding motions up or down hide the buttons and the 61 * input filed, show the scroll wheel, and rotate the latter. Flinging is 62 * also supported. The widget enables mapping from positions to strings such 63 * that instead the position index the corresponding string is displayed. 64 * <p> 65 * For an example of using this widget, see {@link android.widget.TimePicker}. 66 * </p> 67 */ 68@Widget 69public class NumberPicker extends LinearLayout { 70 71 /** 72 * The default update interval during long press. 73 */ 74 private static final long DEFAULT_LONG_PRESS_UPDATE_INTERVAL = 300; 75 76 /** 77 * The index of the middle selector item. 78 */ 79 private static final int SELECTOR_MIDDLE_ITEM_INDEX = 2; 80 81 /** 82 * The coefficient by which to adjust (divide) the max fling velocity. 83 */ 84 private static final int SELECTOR_MAX_FLING_VELOCITY_ADJUSTMENT = 8; 85 86 /** 87 * The the duration for adjusting the selector wheel. 88 */ 89 private static final int SELECTOR_ADJUSTMENT_DURATION_MILLIS = 800; 90 91 /** 92 * The the delay for showing the input controls after a single tap on the 93 * input text. 94 */ 95 private static final int SHOW_INPUT_CONTROLS_DELAY_MILLIS = ViewConfiguration 96 .getDoubleTapTimeout(); 97 98 /** 99 * The update step for incrementing the current value. 100 */ 101 private static final int UPDATE_STEP_INCREMENT = 1; 102 103 /** 104 * The update step for decrementing the current value. 105 */ 106 private static final int UPDATE_STEP_DECREMENT = -1; 107 108 /** 109 * The strength of fading in the top and bottom while drawing the selector. 110 */ 111 private static final float TOP_AND_BOTTOM_FADING_EDGE_STRENGTH = 0.9f; 112 113 /** 114 * The default unscaled height of the selection divider. 115 */ 116 private final int UNSCALED_DEFAULT_SELECTION_DIVIDER_HEIGHT = 2; 117 118 /** 119 * The numbers accepted by the input text's {@link Filter} 120 */ 121 private static final char[] DIGIT_CHARACTERS = new char[] { 122 '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' 123 }; 124 125 /** 126 * Use a custom NumberPicker formatting callback to use two-digit minutes 127 * strings like "01". Keeping a static formatter etc. is the most efficient 128 * way to do this; it avoids creating temporary objects on every call to 129 * format(). 130 * 131 * @hide 132 */ 133 public static final NumberPicker.Formatter TWO_DIGIT_FORMATTER = new NumberPicker.Formatter() { 134 final StringBuilder mBuilder = new StringBuilder(); 135 136 final java.util.Formatter mFmt = new java.util.Formatter(mBuilder, java.util.Locale.US); 137 138 final Object[] mArgs = new Object[1]; 139 140 public String format(int value) { 141 mArgs[0] = value; 142 mBuilder.delete(0, mBuilder.length()); 143 mFmt.format("%02d", mArgs); 144 return mFmt.toString(); 145 } 146 }; 147 148 /** 149 * The increment button. 150 */ 151 private final ImageButton mIncrementButton; 152 153 /** 154 * The decrement button. 155 */ 156 private final ImageButton mDecrementButton; 157 158 /** 159 * The text for showing the current value. 160 */ 161 private final EditText mInputText; 162 163 /** 164 * The height of the text. 165 */ 166 private final int mTextSize; 167 168 /** 169 * The values to be displayed instead the indices. 170 */ 171 private String[] mDisplayedValues; 172 173 /** 174 * Lower value of the range of numbers allowed for the NumberPicker 175 */ 176 private int mMinValue; 177 178 /** 179 * Upper value of the range of numbers allowed for the NumberPicker 180 */ 181 private int mMaxValue; 182 183 /** 184 * Current value of this NumberPicker 185 */ 186 private int mValue; 187 188 /** 189 * Listener to be notified upon current value change. 190 */ 191 private OnValueChangeListener mOnValueChangeListener; 192 193 /** 194 * Listener to be notified upon scroll state change. 195 */ 196 private OnScrollListener mOnScrollListener; 197 198 /** 199 * Formatter for for displaying the current value. 200 */ 201 private Formatter mFormatter; 202 203 /** 204 * The speed for updating the value form long press. 205 */ 206 private long mLongPressUpdateInterval = DEFAULT_LONG_PRESS_UPDATE_INTERVAL; 207 208 /** 209 * Cache for the string representation of selector indices. 210 */ 211 private final SparseArray<String> mSelectorIndexToStringCache = new SparseArray<String>(); 212 213 /** 214 * The selector indices whose value are show by the selector. 215 */ 216 private final int[] mSelectorIndices = new int[] { 217 Integer.MIN_VALUE, Integer.MIN_VALUE, Integer.MIN_VALUE, Integer.MIN_VALUE, 218 Integer.MIN_VALUE 219 }; 220 221 /** 222 * The {@link Paint} for drawing the selector. 223 */ 224 private final Paint mSelectorPaint; 225 226 /** 227 * The height of a selector element (text + gap). 228 */ 229 private int mSelectorElementHeight; 230 231 /** 232 * The initial offset of the scroll selector. 233 */ 234 private int mInitialScrollOffset = Integer.MIN_VALUE; 235 236 /** 237 * The current offset of the scroll selector. 238 */ 239 private int mCurrentScrollOffset; 240 241 /** 242 * The {@link Scroller} responsible for flinging the selector. 243 */ 244 private final Scroller mFlingScroller; 245 246 /** 247 * The {@link Scroller} responsible for adjusting the selector. 248 */ 249 private final Scroller mAdjustScroller; 250 251 /** 252 * The previous Y coordinate while scrolling the selector. 253 */ 254 private int mPreviousScrollerY; 255 256 /** 257 * Handle to the reusable command for setting the input text selection. 258 */ 259 private SetSelectionCommand mSetSelectionCommand; 260 261 /** 262 * Handle to the reusable command for adjusting the scroller. 263 */ 264 private AdjustScrollerCommand mAdjustScrollerCommand; 265 266 /** 267 * Handle to the reusable command for updating the current value from long 268 * press. 269 */ 270 private UpdateValueFromLongPressCommand mUpdateFromLongPressCommand; 271 272 /** 273 * {@link Animator} for showing the up/down arrows. 274 */ 275 private final AnimatorSet mShowInputControlsAnimator; 276 277 /** 278 * The Y position of the last down event. 279 */ 280 private float mLastDownEventY; 281 282 /** 283 * The Y position of the last motion event. 284 */ 285 private float mLastMotionEventY; 286 287 /** 288 * Flag if to begin edit on next up event. 289 */ 290 private boolean mBeginEditOnUpEvent; 291 292 /** 293 * Flag if to adjust the selector wheel on next up event. 294 */ 295 private boolean mAdjustScrollerOnUpEvent; 296 297 /** 298 * Flag if to draw the selector wheel. 299 */ 300 private boolean mDrawSelectorWheel; 301 302 /** 303 * Determines speed during touch scrolling. 304 */ 305 private VelocityTracker mVelocityTracker; 306 307 /** 308 * @see ViewConfiguration#getScaledTouchSlop() 309 */ 310 private int mTouchSlop; 311 312 /** 313 * @see ViewConfiguration#getScaledMinimumFlingVelocity() 314 */ 315 private int mMinimumFlingVelocity; 316 317 /** 318 * @see ViewConfiguration#getScaledMaximumFlingVelocity() 319 */ 320 private int mMaximumFlingVelocity; 321 322 /** 323 * Flag whether the selector should wrap around. 324 */ 325 private boolean mWrapSelectorWheel; 326 327 /** 328 * The back ground color used to optimize scroller fading. 329 */ 330 private final int mSolidColor; 331 332 /** 333 * Flag indicating if this widget supports flinging. 334 */ 335 private final boolean mFlingable; 336 337 /** 338 * Divider for showing item to be selected while scrolling 339 */ 340 private final Drawable mSelectionDivider; 341 342 /** 343 * The height of the selection divider. 344 */ 345 private final int mSelectionDividerHeight; 346 347 /** 348 * Reusable {@link Rect} instance. 349 */ 350 private final Rect mTempRect = new Rect(); 351 352 /** 353 * The current scroll state of the number picker. 354 */ 355 private int mScrollState = OnScrollListener.SCROLL_STATE_IDLE; 356 357 /** 358 * The duration of the animation for showing the input controls. 359 */ 360 private final long mShowInputControlsAnimimationDuration; 361 362 /** 363 * Interface to listen for changes of the current value. 364 */ 365 public interface OnValueChangeListener { 366 367 /** 368 * Called upon a change of the current value. 369 * 370 * @param picker The NumberPicker associated with this listener. 371 * @param oldVal The previous value. 372 * @param newVal The new value. 373 */ 374 void onValueChange(NumberPicker picker, int oldVal, int newVal); 375 } 376 377 /** 378 * Interface to listen for the picker scroll state. 379 */ 380 public interface OnScrollListener { 381 382 /** 383 * The view is not scrolling. 384 */ 385 public static int SCROLL_STATE_IDLE = 0; 386 387 /** 388 * The user is scrolling using touch, and their finger is still on the screen. 389 */ 390 public static int SCROLL_STATE_TOUCH_SCROLL = 1; 391 392 /** 393 * The user had previously been scrolling using touch and performed a fling. 394 */ 395 public static int SCROLL_STATE_FLING = 2; 396 397 /** 398 * Callback invoked while the number picker scroll state has changed. 399 * 400 * @param view The view whose scroll state is being reported. 401 * @param scrollState The current scroll state. One of 402 * {@link #SCROLL_STATE_IDLE}, 403 * {@link #SCROLL_STATE_TOUCH_SCROLL} or 404 * {@link #SCROLL_STATE_IDLE}. 405 */ 406 public void onScrollStateChange(NumberPicker view, int scrollState); 407 } 408 409 /** 410 * Interface used to format current value into a string for presentation. 411 */ 412 public interface Formatter { 413 414 /** 415 * Formats a string representation of the current value. 416 * 417 * @param value The currently selected value. 418 * @return A formatted string representation. 419 */ 420 public String format(int value); 421 } 422 423 /** 424 * Create a new number picker. 425 * 426 * @param context The application environment. 427 */ 428 public NumberPicker(Context context) { 429 this(context, null); 430 } 431 432 /** 433 * Create a new number picker. 434 * 435 * @param context The application environment. 436 * @param attrs A collection of attributes. 437 */ 438 public NumberPicker(Context context, AttributeSet attrs) { 439 this(context, attrs, R.attr.numberPickerStyle); 440 } 441 442 /** 443 * Create a new number picker 444 * 445 * @param context the application environment. 446 * @param attrs a collection of attributes. 447 * @param defStyle The default style to apply to this view. 448 */ 449 public NumberPicker(Context context, AttributeSet attrs, int defStyle) { 450 super(context, attrs, defStyle); 451 452 // process style attributes 453 TypedArray attributesArray = context.obtainStyledAttributes(attrs, 454 R.styleable.NumberPicker, defStyle, 0); 455 mSolidColor = attributesArray.getColor(R.styleable.NumberPicker_solidColor, 0); 456 mFlingable = attributesArray.getBoolean(R.styleable.NumberPicker_flingable, true); 457 mSelectionDivider = attributesArray.getDrawable(R.styleable.NumberPicker_selectionDivider); 458 int defSelectionDividerHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 459 UNSCALED_DEFAULT_SELECTION_DIVIDER_HEIGHT, 460 getResources().getDisplayMetrics()); 461 mSelectionDividerHeight = attributesArray.getDimensionPixelSize( 462 R.styleable.NumberPicker_selectionDividerHeight, defSelectionDividerHeight); 463 attributesArray.recycle(); 464 465 mShowInputControlsAnimimationDuration = getResources().getInteger( 466 R.integer.config_longAnimTime); 467 468 // By default Linearlayout that we extend is not drawn. This is 469 // its draw() method is not called but dispatchDraw() is called 470 // directly (see ViewGroup.drawChild()). However, this class uses 471 // the fading edge effect implemented by View and we need our 472 // draw() method to be called. Therefore, we declare we will draw. 473 setWillNotDraw(false); 474 setDrawSelectorWheel(false); 475 476 LayoutInflater inflater = (LayoutInflater) getContext().getSystemService( 477 Context.LAYOUT_INFLATER_SERVICE); 478 inflater.inflate(R.layout.number_picker, this, true); 479 480 OnClickListener onClickListener = new OnClickListener() { 481 public void onClick(View v) { 482 mInputText.clearFocus(); 483 if (v.getId() == R.id.increment) { 484 changeCurrent(mValue + 1); 485 } else { 486 changeCurrent(mValue - 1); 487 } 488 } 489 }; 490 491 OnLongClickListener onLongClickListener = new OnLongClickListener() { 492 public boolean onLongClick(View v) { 493 mInputText.clearFocus(); 494 if (v.getId() == R.id.increment) { 495 postUpdateValueFromLongPress(UPDATE_STEP_INCREMENT); 496 } else { 497 postUpdateValueFromLongPress(UPDATE_STEP_DECREMENT); 498 } 499 return true; 500 } 501 }; 502 503 // increment button 504 mIncrementButton = (ImageButton) findViewById(R.id.increment); 505 mIncrementButton.setOnClickListener(onClickListener); 506 mIncrementButton.setOnLongClickListener(onLongClickListener); 507 508 // decrement button 509 mDecrementButton = (ImageButton) findViewById(R.id.decrement); 510 mDecrementButton.setOnClickListener(onClickListener); 511 mDecrementButton.setOnLongClickListener(onLongClickListener); 512 513 // input text 514 mInputText = (EditText) findViewById(R.id.numberpicker_input); 515 mInputText.setOnFocusChangeListener(new OnFocusChangeListener() { 516 public void onFocusChange(View v, boolean hasFocus) { 517 if (!hasFocus) { 518 validateInputTextView(v); 519 } 520 } 521 }); 522 mInputText.setFilters(new InputFilter[] { 523 new InputTextFilter() 524 }); 525 526 mInputText.setRawInputType(InputType.TYPE_CLASS_NUMBER); 527 528 // initialize constants 529 mTouchSlop = ViewConfiguration.getTapTimeout(); 530 ViewConfiguration configuration = ViewConfiguration.get(context); 531 mTouchSlop = configuration.getScaledTouchSlop(); 532 mMinimumFlingVelocity = configuration.getScaledMinimumFlingVelocity(); 533 mMaximumFlingVelocity = configuration.getScaledMaximumFlingVelocity() 534 / SELECTOR_MAX_FLING_VELOCITY_ADJUSTMENT; 535 mTextSize = (int) mInputText.getTextSize(); 536 537 // create the selector wheel paint 538 Paint paint = new Paint(); 539 paint.setAntiAlias(true); 540 paint.setTextAlign(Align.CENTER); 541 paint.setTextSize(mTextSize); 542 paint.setTypeface(mInputText.getTypeface()); 543 ColorStateList colors = mInputText.getTextColors(); 544 int color = colors.getColorForState(ENABLED_STATE_SET, Color.WHITE); 545 paint.setColor(color); 546 mSelectorPaint = paint; 547 548 // create the animator for showing the input controls 549 final ValueAnimator fadeScroller = ObjectAnimator.ofInt(this, "selectorPaintAlpha", 255, 0); 550 final ObjectAnimator showIncrementButton = ObjectAnimator.ofFloat(mIncrementButton, 551 "alpha", 0, 1); 552 final ObjectAnimator showDecrementButton = ObjectAnimator.ofFloat(mDecrementButton, 553 "alpha", 0, 1); 554 mShowInputControlsAnimator = new AnimatorSet(); 555 mShowInputControlsAnimator.playTogether(fadeScroller, showIncrementButton, 556 showDecrementButton); 557 mShowInputControlsAnimator.addListener(new AnimatorListenerAdapter() { 558 private boolean mCanceled = false; 559 560 @Override 561 public void onAnimationEnd(Animator animation) { 562 if (!mCanceled) { 563 // if canceled => we still want the wheel drawn 564 setDrawSelectorWheel(false); 565 } 566 mCanceled = false; 567 mSelectorPaint.setAlpha(255); 568 invalidate(); 569 } 570 571 @Override 572 public void onAnimationCancel(Animator animation) { 573 if (mShowInputControlsAnimator.isRunning()) { 574 mCanceled = true; 575 } 576 } 577 }); 578 579 // create the fling and adjust scrollers 580 mFlingScroller = new Scroller(getContext(), null, true); 581 mAdjustScroller = new Scroller(getContext(), new DecelerateInterpolator(2.5f)); 582 583 updateInputTextView(); 584 updateIncrementAndDecrementButtonsVisibilityState(); 585 586 if (mFlingable) { 587 // Start with shown selector wheel and hidden controls. When made 588 // visible hide the selector and fade-in the controls to suggest 589 // fling interaction. 590 setDrawSelectorWheel(true); 591 hideInputControls(); 592 } 593 } 594 595 @Override 596 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 597 super.onLayout(changed, left, top, right, bottom); 598 // need to do this when we know our size 599 initializeScrollWheel(); 600 } 601 602 @Override 603 public boolean onInterceptTouchEvent(MotionEvent event) { 604 if (!isEnabled() || !mFlingable) { 605 return false; 606 } 607 switch (event.getActionMasked()) { 608 case MotionEvent.ACTION_DOWN: 609 mLastMotionEventY = mLastDownEventY = event.getY(); 610 removeAllCallbacks(); 611 mBeginEditOnUpEvent = false; 612 mAdjustScrollerOnUpEvent = true; 613 if (mDrawSelectorWheel) { 614 boolean scrollersFinished = mFlingScroller.isFinished() 615 && mAdjustScroller.isFinished(); 616 if (!scrollersFinished) { 617 mFlingScroller.forceFinished(true); 618 mAdjustScroller.forceFinished(true); 619 onScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); 620 } 621 mBeginEditOnUpEvent = scrollersFinished; 622 mAdjustScrollerOnUpEvent = true; 623 hideInputControls(); 624 return true; 625 } 626 if (isEventInInputText(event)) { 627 mAdjustScrollerOnUpEvent = false; 628 setDrawSelectorWheel(true); 629 hideInputControls(); 630 return true; 631 } 632 break; 633 case MotionEvent.ACTION_MOVE: 634 float currentMoveY = event.getY(); 635 int deltaDownY = (int) Math.abs(currentMoveY - mLastDownEventY); 636 if (deltaDownY > mTouchSlop) { 637 mBeginEditOnUpEvent = false; 638 onScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL); 639 setDrawSelectorWheel(true); 640 hideInputControls(); 641 return true; 642 } 643 break; 644 } 645 return false; 646 } 647 648 @Override 649 public boolean onTouchEvent(MotionEvent ev) { 650 if (!isEnabled()) { 651 return false; 652 } 653 if (mVelocityTracker == null) { 654 mVelocityTracker = VelocityTracker.obtain(); 655 } 656 mVelocityTracker.addMovement(ev); 657 int action = ev.getActionMasked(); 658 switch (action) { 659 case MotionEvent.ACTION_MOVE: 660 float currentMoveY = ev.getY(); 661 if (mBeginEditOnUpEvent 662 || mScrollState != OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) { 663 int deltaDownY = (int) Math.abs(currentMoveY - mLastDownEventY); 664 if (deltaDownY > mTouchSlop) { 665 mBeginEditOnUpEvent = false; 666 onScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL); 667 } 668 } 669 int deltaMoveY = (int) (currentMoveY - mLastMotionEventY); 670 scrollBy(0, deltaMoveY); 671 invalidate(); 672 mLastMotionEventY = currentMoveY; 673 break; 674 case MotionEvent.ACTION_UP: 675 if (mBeginEditOnUpEvent) { 676 setDrawSelectorWheel(false); 677 showInputControls(mShowInputControlsAnimimationDuration); 678 mInputText.requestFocus(); 679 InputMethodManager imm = (InputMethodManager) getContext().getSystemService( 680 Context.INPUT_METHOD_SERVICE); 681 imm.showSoftInput(mInputText, 0); 682 mInputText.setSelection(0, mInputText.getText().length()); 683 return true; 684 } 685 VelocityTracker velocityTracker = mVelocityTracker; 686 velocityTracker.computeCurrentVelocity(1000, mMaximumFlingVelocity); 687 int initialVelocity = (int) velocityTracker.getYVelocity(); 688 if (Math.abs(initialVelocity) > mMinimumFlingVelocity) { 689 fling(initialVelocity); 690 onScrollStateChange(OnScrollListener.SCROLL_STATE_FLING); 691 } else { 692 if (mAdjustScrollerOnUpEvent) { 693 if (mFlingScroller.isFinished() && mAdjustScroller.isFinished()) { 694 postAdjustScrollerCommand(0); 695 } 696 } else { 697 postAdjustScrollerCommand(SHOW_INPUT_CONTROLS_DELAY_MILLIS); 698 } 699 } 700 mVelocityTracker.recycle(); 701 mVelocityTracker = null; 702 break; 703 } 704 return true; 705 } 706 707 @Override 708 public boolean dispatchTouchEvent(MotionEvent event) { 709 int action = event.getActionMasked(); 710 if ((action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) 711 && !isEventInInputText(event)) { 712 removeAllCallbacks(); 713 } 714 return super.dispatchTouchEvent(event); 715 } 716 717 @Override 718 public boolean dispatchKeyEvent(KeyEvent event) { 719 int keyCode = event.getKeyCode(); 720 if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER || keyCode == KeyEvent.KEYCODE_ENTER) { 721 removeAllCallbacks(); 722 } 723 return super.dispatchKeyEvent(event); 724 } 725 726 @Override 727 public boolean dispatchTrackballEvent(MotionEvent event) { 728 int action = event.getActionMasked(); 729 if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) { 730 removeAllCallbacks(); 731 } 732 return super.dispatchTrackballEvent(event); 733 } 734 735 @Override 736 public void computeScroll() { 737 if (!mDrawSelectorWheel) { 738 return; 739 } 740 Scroller scroller = mFlingScroller; 741 if (scroller.isFinished()) { 742 scroller = mAdjustScroller; 743 if (scroller.isFinished()) { 744 return; 745 } 746 } 747 scroller.computeScrollOffset(); 748 int currentScrollerY = scroller.getCurrY(); 749 if (mPreviousScrollerY == 0) { 750 mPreviousScrollerY = scroller.getStartY(); 751 } 752 scrollBy(0, currentScrollerY - mPreviousScrollerY); 753 mPreviousScrollerY = currentScrollerY; 754 if (scroller.isFinished()) { 755 onScrollerFinished(scroller); 756 } else { 757 invalidate(); 758 } 759 } 760 761 @Override 762 public void setEnabled(boolean enabled) { 763 super.setEnabled(enabled); 764 mIncrementButton.setEnabled(enabled); 765 mDecrementButton.setEnabled(enabled); 766 mInputText.setEnabled(enabled); 767 } 768 769 @Override 770 public void scrollBy(int x, int y) { 771 int[] selectorIndices = getSelectorIndices(); 772 if (!mWrapSelectorWheel && y > 0 773 && selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] <= mMinValue) { 774 mCurrentScrollOffset = mInitialScrollOffset; 775 return; 776 } 777 if (!mWrapSelectorWheel && y < 0 778 && selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] >= mMaxValue) { 779 mCurrentScrollOffset = mInitialScrollOffset; 780 return; 781 } 782 mCurrentScrollOffset += y; 783 while (mCurrentScrollOffset - mInitialScrollOffset >= mSelectorElementHeight) { 784 mCurrentScrollOffset -= mSelectorElementHeight; 785 decrementSelectorIndices(selectorIndices); 786 changeCurrent(selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX]); 787 if (selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] <= mMinValue) { 788 mCurrentScrollOffset = mInitialScrollOffset; 789 } 790 } 791 while (mCurrentScrollOffset - mInitialScrollOffset <= -mSelectorElementHeight) { 792 mCurrentScrollOffset += mSelectorElementHeight; 793 incrementScrollSelectorIndices(selectorIndices); 794 changeCurrent(selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX]); 795 if (selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] >= mMaxValue) { 796 mCurrentScrollOffset = mInitialScrollOffset; 797 } 798 } 799 } 800 801 @Override 802 public int getSolidColor() { 803 return mSolidColor; 804 } 805 806 /** 807 * Sets the listener to be notified on change of the current value. 808 * 809 * @param onValueChangedListener The listener. 810 */ 811 public void setOnValueChangedListener(OnValueChangeListener onValueChangedListener) { 812 mOnValueChangeListener = onValueChangedListener; 813 } 814 815 /** 816 * Set listener to be notified for scroll state changes. 817 * 818 * @param onScrollListener The listener. 819 */ 820 public void setOnScrollListener(OnScrollListener onScrollListener) { 821 mOnScrollListener = onScrollListener; 822 } 823 824 /** 825 * Set the formatter to be used for formatting the current value. 826 * <p> 827 * Note: If you have provided alternative values for the values this 828 * formatter is never invoked. 829 * </p> 830 * 831 * @param formatter The formatter object. If formatter is <code>null</code>, 832 * {@link String#valueOf(int)} will be used. 833 * 834 * @see #setDisplayedValues(String[]) 835 */ 836 public void setFormatter(Formatter formatter) { 837 if (formatter == mFormatter) { 838 return; 839 } 840 mFormatter = formatter; 841 resetSelectorWheelIndices(); 842 updateInputTextView(); 843 } 844 845 /** 846 * Set the current value for the number picker. 847 * <p> 848 * If the argument is less than the {@link NumberPicker#getMinValue()} and 849 * {@link NumberPicker#getWrapSelectorWheel()} is <code>false</code> the 850 * current value is set to the {@link NumberPicker#getMinValue()} value. 851 * </p> 852 * <p> 853 * If the argument is less than the {@link NumberPicker#getMinValue()} and 854 * {@link NumberPicker#getWrapSelectorWheel()} is <code>true</code> the 855 * current value is set to the {@link NumberPicker#getMaxValue()} value. 856 * </p> 857 * <p> 858 * If the argument is less than the {@link NumberPicker#getMaxValue()} and 859 * {@link NumberPicker#getWrapSelectorWheel()} is <code>false</code> the 860 * current value is set to the {@link NumberPicker#getMaxValue()} value. 861 * </p> 862 * <p> 863 * If the argument is less than the {@link NumberPicker#getMaxValue()} and 864 * {@link NumberPicker#getWrapSelectorWheel()} is <code>true</code> the 865 * current value is set to the {@link NumberPicker#getMinValue()} value. 866 * </p> 867 * 868 * @param value The current value. 869 * @see #setWrapSelectorWheel(boolean) 870 * @see #setMinValue(int) 871 * @see #setMaxValue(int) 872 */ 873 public void setValue(int value) { 874 if (mValue == value) { 875 return; 876 } 877 if (value < mMinValue) { 878 value = mWrapSelectorWheel ? mMaxValue : mMinValue; 879 } 880 if (value > mMaxValue) { 881 value = mWrapSelectorWheel ? mMinValue : mMaxValue; 882 } 883 mValue = value; 884 updateInputTextView(); 885 updateIncrementAndDecrementButtonsVisibilityState(); 886 } 887 888 /** 889 * Gets whether the selector wheel wraps when reaching the min/max value. 890 * 891 * @return True if the selector wheel wraps. 892 * 893 * @see #getMinValue() 894 * @see #getMaxValue() 895 */ 896 public boolean getWrapSelectorWheel() { 897 return mWrapSelectorWheel; 898 } 899 900 /** 901 * Sets whether the selector wheel shown during flinging/scrolling should 902 * wrap around the {@link NumberPicker#getMinValue()} and 903 * {@link NumberPicker#getMaxValue()} values. 904 * <p> 905 * By default if the range (max - min) is more than five (the number of 906 * items shown on the selector wheel) the selector wheel wrapping is 907 * enabled. 908 * </p> 909 * 910 * @param wrapSelector Whether to wrap. 911 */ 912 public void setWrapSelectorWheel(boolean wrapSelector) { 913 if (wrapSelector && (mMaxValue - mMinValue) < mSelectorIndices.length) { 914 throw new IllegalStateException("Range less than selector items count."); 915 } 916 if (wrapSelector != mWrapSelectorWheel) { 917 // force the selector indices array to be reinitialized 918 mSelectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] = Integer.MAX_VALUE; 919 mWrapSelectorWheel = wrapSelector; 920 // force redraw since we might look different 921 updateIncrementAndDecrementButtonsVisibilityState(); 922 } 923 } 924 925 /** 926 * Sets the speed at which the numbers be incremented and decremented when 927 * the up and down buttons are long pressed respectively. 928 * <p> 929 * The default value is 300 ms. 930 * </p> 931 * 932 * @param intervalMillis The speed (in milliseconds) at which the numbers 933 * will be incremented and decremented. 934 */ 935 public void setOnLongPressUpdateInterval(long intervalMillis) { 936 mLongPressUpdateInterval = intervalMillis; 937 } 938 939 /** 940 * Returns the value of the picker. 941 * 942 * @return The value. 943 */ 944 public int getValue() { 945 return mValue; 946 } 947 948 /** 949 * Returns the min value of the picker. 950 * 951 * @return The min value 952 */ 953 public int getMinValue() { 954 return mMinValue; 955 } 956 957 /** 958 * Sets the min value of the picker. 959 * 960 * @param minValue The min value. 961 */ 962 public void setMinValue(int minValue) { 963 if (mMinValue == minValue) { 964 return; 965 } 966 if (minValue < 0) { 967 throw new IllegalArgumentException("minValue must be >= 0"); 968 } 969 mMinValue = minValue; 970 if (mMinValue > mValue) { 971 mValue = mMinValue; 972 } 973 boolean wrapSelectorWheel = mMaxValue - mMinValue > mSelectorIndices.length; 974 setWrapSelectorWheel(wrapSelectorWheel); 975 resetSelectorWheelIndices(); 976 updateInputTextView(); 977 } 978 979 /** 980 * Returns the max value of the picker. 981 * 982 * @return The max value. 983 */ 984 public int getMaxValue() { 985 return mMaxValue; 986 } 987 988 /** 989 * Sets the max value of the picker. 990 * 991 * @param maxValue The max value. 992 */ 993 public void setMaxValue(int maxValue) { 994 if (mMaxValue == maxValue) { 995 return; 996 } 997 if (maxValue < 0) { 998 throw new IllegalArgumentException("maxValue must be >= 0"); 999 } 1000 mMaxValue = maxValue; 1001 if (mMaxValue < mValue) { 1002 mValue = mMaxValue; 1003 } 1004 boolean wrapSelectorWheel = mMaxValue - mMinValue > mSelectorIndices.length; 1005 setWrapSelectorWheel(wrapSelectorWheel); 1006 resetSelectorWheelIndices(); 1007 updateInputTextView(); 1008 } 1009 1010 /** 1011 * Gets the values to be displayed instead of string values. 1012 * 1013 * @return The displayed values. 1014 */ 1015 public String[] getDisplayedValues() { 1016 return mDisplayedValues; 1017 } 1018 1019 /** 1020 * Sets the values to be displayed. 1021 * 1022 * @param displayedValues The displayed values. 1023 */ 1024 public void setDisplayedValues(String[] displayedValues) { 1025 if (mDisplayedValues == displayedValues) { 1026 return; 1027 } 1028 mDisplayedValues = displayedValues; 1029 if (mDisplayedValues != null) { 1030 // Allow text entry rather than strictly numeric entry. 1031 mInputText.setRawInputType(InputType.TYPE_CLASS_TEXT 1032 | InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS); 1033 } else { 1034 mInputText.setRawInputType(InputType.TYPE_CLASS_NUMBER); 1035 } 1036 updateInputTextView(); 1037 resetSelectorWheelIndices(); 1038 } 1039 1040 @Override 1041 protected float getTopFadingEdgeStrength() { 1042 return TOP_AND_BOTTOM_FADING_EDGE_STRENGTH; 1043 } 1044 1045 @Override 1046 protected float getBottomFadingEdgeStrength() { 1047 return TOP_AND_BOTTOM_FADING_EDGE_STRENGTH; 1048 } 1049 1050 @Override 1051 protected void onAttachedToWindow() { 1052 super.onAttachedToWindow(); 1053 // make sure we show the controls only the very 1054 // first time the user sees this widget 1055 if (mFlingable) { 1056 // animate a bit slower the very first time 1057 showInputControls(mShowInputControlsAnimimationDuration * 2); 1058 } 1059 } 1060 1061 @Override 1062 protected void onDetachedFromWindow() { 1063 removeAllCallbacks(); 1064 } 1065 1066 @Override 1067 protected void dispatchDraw(Canvas canvas) { 1068 // There is a good reason for doing this. See comments in draw(). 1069 } 1070 1071 @Override 1072 public void draw(Canvas canvas) { 1073 // Dispatch draw to our children only if we are not currently running 1074 // the animation for simultaneously fading out the scroll wheel and 1075 // showing in the buttons. This class takes advantage of the View 1076 // implementation of fading edges effect to draw the selector wheel. 1077 // However, in View.draw(), the fading is applied after all the children 1078 // have been drawn and we do not want this fading to be applied to the 1079 // buttons which are currently showing in. Therefore, we draw our 1080 // children after we have completed drawing ourselves. 1081 super.draw(canvas); 1082 1083 // Draw our children if we are not showing the selector wheel of fading 1084 // it out 1085 if (mShowInputControlsAnimator.isRunning() || !mDrawSelectorWheel) { 1086 long drawTime = getDrawingTime(); 1087 for (int i = 0, count = getChildCount(); i < count; i++) { 1088 View child = getChildAt(i); 1089 if (!child.isShown()) { 1090 continue; 1091 } 1092 drawChild(canvas, getChildAt(i), drawTime); 1093 } 1094 } 1095 } 1096 1097 @Override 1098 protected void onDraw(Canvas canvas) { 1099 // we only draw the selector wheel 1100 if (!mDrawSelectorWheel) { 1101 return; 1102 } 1103 float x = (mRight - mLeft) / 2; 1104 float y = mCurrentScrollOffset; 1105 1106 // draw the selector wheel 1107 int[] selectorIndices = getSelectorIndices(); 1108 for (int i = 0; i < selectorIndices.length; i++) { 1109 int selectorIndex = selectorIndices[i]; 1110 String scrollSelectorValue = mSelectorIndexToStringCache.get(selectorIndex); 1111 canvas.drawText(scrollSelectorValue, x, y, mSelectorPaint); 1112 y += mSelectorElementHeight; 1113 } 1114 1115 // draw the selection dividers (only if scrolling and drawable specified) 1116 if (mSelectionDivider != null) { 1117 mSelectionDivider.setAlpha(mSelectorPaint.getAlpha()); 1118 // draw the top divider 1119 int topOfTopDivider = 1120 (getHeight() - mSelectorElementHeight - mSelectionDividerHeight) / 2; 1121 int bottomOfTopDivider = topOfTopDivider + mSelectionDividerHeight; 1122 mSelectionDivider.setBounds(0, topOfTopDivider, mRight, bottomOfTopDivider); 1123 mSelectionDivider.draw(canvas); 1124 1125 // draw the bottom divider 1126 int topOfBottomDivider = topOfTopDivider + mSelectorElementHeight; 1127 int bottomOfBottomDivider = bottomOfTopDivider + mSelectorElementHeight; 1128 mSelectionDivider.setBounds(0, topOfBottomDivider, mRight, bottomOfBottomDivider); 1129 mSelectionDivider.draw(canvas); 1130 } 1131 } 1132 1133 /** 1134 * Resets the selector indices and clear the cached 1135 * string representation of these indices. 1136 */ 1137 private void resetSelectorWheelIndices() { 1138 mSelectorIndexToStringCache.clear(); 1139 int[] selectorIdices = getSelectorIndices(); 1140 for (int i = 0; i < selectorIdices.length; i++) { 1141 selectorIdices[i] = Integer.MIN_VALUE; 1142 } 1143 } 1144 1145 /** 1146 * Sets the current value of this NumberPicker, and sets mPrevious to the 1147 * previous value. If current is greater than mEnd less than mStart, the 1148 * value of mCurrent is wrapped around. Subclasses can override this to 1149 * change the wrapping behavior 1150 * 1151 * @param current the new value of the NumberPicker 1152 */ 1153 private void changeCurrent(int current) { 1154 if (mValue == current) { 1155 return; 1156 } 1157 // Wrap around the values if we go past the start or end 1158 if (mWrapSelectorWheel) { 1159 current = getWrappedSelectorIndex(current); 1160 } 1161 int previous = mValue; 1162 setValue(current); 1163 notifyChange(previous, current); 1164 } 1165 1166 /** 1167 * Sets the <code>alpha</code> of the {@link Paint} for drawing the selector 1168 * wheel. 1169 */ 1170 @SuppressWarnings("unused") 1171 // Called by ShowInputControlsAnimator via reflection 1172 private void setSelectorPaintAlpha(int alpha) { 1173 mSelectorPaint.setAlpha(alpha); 1174 if (mDrawSelectorWheel) { 1175 invalidate(); 1176 } 1177 } 1178 1179 /** 1180 * @return If the <code>event</code> is in the input text. 1181 */ 1182 private boolean isEventInInputText(MotionEvent event) { 1183 mInputText.getHitRect(mTempRect); 1184 return mTempRect.contains((int) event.getX(), (int) event.getY()); 1185 } 1186 1187 /** 1188 * Sets if to <code>drawSelectionWheel</code>. 1189 */ 1190 private void setDrawSelectorWheel(boolean drawSelectorWheel) { 1191 mDrawSelectorWheel = drawSelectorWheel; 1192 // do not fade if the selector wheel not shown 1193 setVerticalFadingEdgeEnabled(drawSelectorWheel); 1194 } 1195 1196 private void initializeScrollWheel() { 1197 if (mInitialScrollOffset != Integer.MIN_VALUE) { 1198 return; 1199 1200 } 1201 int[] selectorIndices = getSelectorIndices(); 1202 int totalTextHeight = selectorIndices.length * mTextSize; 1203 int totalTextGapHeight = (mBottom - mTop) - totalTextHeight; 1204 int textGapCount = selectorIndices.length - 1; 1205 int selectorTextGapHeight = totalTextGapHeight / textGapCount; 1206 // compensate for integer division loss of the components used to 1207 // calculate the text gap 1208 int integerDivisionLoss = (mTextSize + mBottom - mTop) % textGapCount; 1209 mInitialScrollOffset = mCurrentScrollOffset = mTextSize - integerDivisionLoss / 2; 1210 mSelectorElementHeight = mTextSize + selectorTextGapHeight; 1211 updateInputTextView(); 1212 } 1213 1214 /** 1215 * Callback invoked upon completion of a given <code>scroller</code>. 1216 */ 1217 private void onScrollerFinished(Scroller scroller) { 1218 if (scroller == mFlingScroller) { 1219 postAdjustScrollerCommand(0); 1220 onScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); 1221 } else { 1222 updateInputTextView(); 1223 showInputControls(mShowInputControlsAnimimationDuration); 1224 } 1225 } 1226 1227 /** 1228 * Handles transition to a given <code>scrollState</code> 1229 */ 1230 private void onScrollStateChange(int scrollState) { 1231 if (mScrollState == scrollState) { 1232 return; 1233 } 1234 mScrollState = scrollState; 1235 if (mOnScrollListener != null) { 1236 mOnScrollListener.onScrollStateChange(this, scrollState); 1237 } 1238 } 1239 1240 /** 1241 * Flings the selector with the given <code>velocityY</code>. 1242 */ 1243 private void fling(int velocityY) { 1244 mPreviousScrollerY = 0; 1245 Scroller flingScroller = mFlingScroller; 1246 1247 if (mWrapSelectorWheel) { 1248 if (velocityY > 0) { 1249 flingScroller.fling(0, 0, 0, velocityY, 0, 0, 0, Integer.MAX_VALUE); 1250 } else { 1251 flingScroller.fling(0, Integer.MAX_VALUE, 0, velocityY, 0, 0, 0, Integer.MAX_VALUE); 1252 } 1253 } else { 1254 if (velocityY > 0) { 1255 int maxY = mTextSize * (mValue - mMinValue); 1256 flingScroller.fling(0, 0, 0, velocityY, 0, 0, 0, maxY); 1257 } else { 1258 int startY = mTextSize * (mMaxValue - mValue); 1259 int maxY = startY; 1260 flingScroller.fling(0, startY, 0, velocityY, 0, 0, 0, maxY); 1261 } 1262 } 1263 1264 postAdjustScrollerCommand(flingScroller.getDuration()); 1265 invalidate(); 1266 } 1267 1268 /** 1269 * Hides the input controls which is the up/down arrows and the text field. 1270 */ 1271 private void hideInputControls() { 1272 mShowInputControlsAnimator.cancel(); 1273 mIncrementButton.setVisibility(INVISIBLE); 1274 mDecrementButton.setVisibility(INVISIBLE); 1275 mInputText.setVisibility(INVISIBLE); 1276 } 1277 1278 /** 1279 * Show the input controls by making them visible and animating the alpha 1280 * property up/down arrows. 1281 * 1282 * @param animationDuration The duration of the animation. 1283 */ 1284 private void showInputControls(long animationDuration) { 1285 updateIncrementAndDecrementButtonsVisibilityState(); 1286 mInputText.setVisibility(VISIBLE); 1287 mShowInputControlsAnimator.setDuration(animationDuration); 1288 mShowInputControlsAnimator.start(); 1289 } 1290 1291 /** 1292 * Updates the visibility state of the increment and decrement buttons. 1293 */ 1294 private void updateIncrementAndDecrementButtonsVisibilityState() { 1295 if (mWrapSelectorWheel || mValue < mMaxValue) { 1296 mIncrementButton.setVisibility(VISIBLE); 1297 } else { 1298 mIncrementButton.setVisibility(INVISIBLE); 1299 } 1300 if (mWrapSelectorWheel || mValue > mMinValue) { 1301 mDecrementButton.setVisibility(VISIBLE); 1302 } else { 1303 mDecrementButton.setVisibility(INVISIBLE); 1304 } 1305 } 1306 1307 /** 1308 * @return The selector indices array with proper values with the current as 1309 * the middle one. 1310 */ 1311 private int[] getSelectorIndices() { 1312 int current = getValue(); 1313 if (mSelectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] != current) { 1314 for (int i = 0; i < mSelectorIndices.length; i++) { 1315 int selectorIndex = current + (i - SELECTOR_MIDDLE_ITEM_INDEX); 1316 if (mWrapSelectorWheel) { 1317 selectorIndex = getWrappedSelectorIndex(selectorIndex); 1318 } 1319 mSelectorIndices[i] = selectorIndex; 1320 ensureCachedScrollSelectorValue(mSelectorIndices[i]); 1321 } 1322 } 1323 return mSelectorIndices; 1324 } 1325 1326 /** 1327 * @return The wrapped index <code>selectorIndex</code> value. 1328 */ 1329 private int getWrappedSelectorIndex(int selectorIndex) { 1330 if (selectorIndex > mMaxValue) { 1331 return mMinValue + (selectorIndex - mMaxValue) % (mMaxValue - mMinValue) - 1; 1332 } else if (selectorIndex < mMinValue) { 1333 return mMaxValue - (mMinValue - selectorIndex) % (mMaxValue - mMinValue) + 1; 1334 } 1335 return selectorIndex; 1336 } 1337 1338 /** 1339 * Increments the <code>selectorIndices</code> whose string representations 1340 * will be displayed in the selector. 1341 */ 1342 private void incrementScrollSelectorIndices(int[] selectorIndices) { 1343 for (int i = 0; i < selectorIndices.length - 1; i++) { 1344 selectorIndices[i] = selectorIndices[i + 1]; 1345 } 1346 int nextScrollSelectorIndex = selectorIndices[selectorIndices.length - 2] + 1; 1347 if (mWrapSelectorWheel && nextScrollSelectorIndex > mMaxValue) { 1348 nextScrollSelectorIndex = mMinValue; 1349 } 1350 selectorIndices[selectorIndices.length - 1] = nextScrollSelectorIndex; 1351 ensureCachedScrollSelectorValue(nextScrollSelectorIndex); 1352 } 1353 1354 /** 1355 * Decrements the <code>selectorIndices</code> whose string representations 1356 * will be displayed in the selector. 1357 */ 1358 private void decrementSelectorIndices(int[] selectorIndices) { 1359 for (int i = selectorIndices.length - 1; i > 0; i--) { 1360 selectorIndices[i] = selectorIndices[i - 1]; 1361 } 1362 int nextScrollSelectorIndex = selectorIndices[1] - 1; 1363 if (mWrapSelectorWheel && nextScrollSelectorIndex < mMinValue) { 1364 nextScrollSelectorIndex = mMaxValue; 1365 } 1366 selectorIndices[0] = nextScrollSelectorIndex; 1367 ensureCachedScrollSelectorValue(nextScrollSelectorIndex); 1368 } 1369 1370 /** 1371 * Ensures we have a cached string representation of the given <code> 1372 * selectorIndex</code> 1373 * to avoid multiple instantiations of the same string. 1374 */ 1375 private void ensureCachedScrollSelectorValue(int selectorIndex) { 1376 SparseArray<String> cache = mSelectorIndexToStringCache; 1377 String scrollSelectorValue = cache.get(selectorIndex); 1378 if (scrollSelectorValue != null) { 1379 return; 1380 } 1381 if (selectorIndex < mMinValue || selectorIndex > mMaxValue) { 1382 scrollSelectorValue = ""; 1383 } else { 1384 if (mDisplayedValues != null) { 1385 int displayedValueIndex = selectorIndex - mMinValue; 1386 scrollSelectorValue = mDisplayedValues[displayedValueIndex]; 1387 } else { 1388 scrollSelectorValue = formatNumber(selectorIndex); 1389 } 1390 } 1391 cache.put(selectorIndex, scrollSelectorValue); 1392 } 1393 1394 private String formatNumber(int value) { 1395 return (mFormatter != null) ? mFormatter.format(value) : String.valueOf(value); 1396 } 1397 1398 private void validateInputTextView(View v) { 1399 String str = String.valueOf(((TextView) v).getText()); 1400 if (TextUtils.isEmpty(str)) { 1401 // Restore to the old value as we don't allow empty values 1402 updateInputTextView(); 1403 } else { 1404 // Check the new value and ensure it's in range 1405 int current = getSelectedPos(str.toString()); 1406 changeCurrent(current); 1407 } 1408 } 1409 1410 /** 1411 * Updates the view of this NumberPicker. If displayValues were specified in 1412 * the string corresponding to the index specified by the current value will 1413 * be returned. Otherwise, the formatter specified in {@link #setFormatter} 1414 * will be used to format the number. 1415 */ 1416 private void updateInputTextView() { 1417 /* 1418 * If we don't have displayed values then use the current number else 1419 * find the correct value in the displayed values for the current 1420 * number. 1421 */ 1422 if (mDisplayedValues == null) { 1423 mInputText.setText(formatNumber(mValue)); 1424 } else { 1425 mInputText.setText(mDisplayedValues[mValue - mMinValue]); 1426 } 1427 mInputText.setSelection(mInputText.getText().length()); 1428 } 1429 1430 /** 1431 * Notifies the listener, if registered, of a change of the value of this 1432 * NumberPicker. 1433 */ 1434 private void notifyChange(int previous, int current) { 1435 if (mOnValueChangeListener != null) { 1436 mOnValueChangeListener.onValueChange(this, previous, mValue); 1437 } 1438 } 1439 1440 /** 1441 * Posts a command for updating the current value every <code>updateMillis 1442 * </code>. 1443 */ 1444 private void postUpdateValueFromLongPress(int updateMillis) { 1445 mInputText.clearFocus(); 1446 removeAllCallbacks(); 1447 if (mUpdateFromLongPressCommand == null) { 1448 mUpdateFromLongPressCommand = new UpdateValueFromLongPressCommand(); 1449 } 1450 mUpdateFromLongPressCommand.setUpdateStep(updateMillis); 1451 post(mUpdateFromLongPressCommand); 1452 } 1453 1454 /** 1455 * Removes all pending callback from the message queue. 1456 */ 1457 private void removeAllCallbacks() { 1458 if (mUpdateFromLongPressCommand != null) { 1459 removeCallbacks(mUpdateFromLongPressCommand); 1460 } 1461 if (mAdjustScrollerCommand != null) { 1462 removeCallbacks(mAdjustScrollerCommand); 1463 } 1464 if (mSetSelectionCommand != null) { 1465 removeCallbacks(mSetSelectionCommand); 1466 } 1467 } 1468 1469 /** 1470 * @return The selected index given its displayed <code>value</code>. 1471 */ 1472 private int getSelectedPos(String value) { 1473 if (mDisplayedValues == null) { 1474 try { 1475 return Integer.parseInt(value); 1476 } catch (NumberFormatException e) { 1477 // Ignore as if it's not a number we don't care 1478 } 1479 } else { 1480 for (int i = 0; i < mDisplayedValues.length; i++) { 1481 // Don't force the user to type in jan when ja will do 1482 value = value.toLowerCase(); 1483 if (mDisplayedValues[i].toLowerCase().startsWith(value)) { 1484 return mMinValue + i; 1485 } 1486 } 1487 1488 /* 1489 * The user might have typed in a number into the month field i.e. 1490 * 10 instead of OCT so support that too. 1491 */ 1492 try { 1493 return Integer.parseInt(value); 1494 } catch (NumberFormatException e) { 1495 1496 // Ignore as if it's not a number we don't care 1497 } 1498 } 1499 return mMinValue; 1500 } 1501 1502 /** 1503 * Posts an {@link SetSelectionCommand} from the given <code>selectionStart 1504 * </code> to 1505 * <code>selectionEnd</code>. 1506 */ 1507 private void postSetSelectionCommand(int selectionStart, int selectionEnd) { 1508 if (mSetSelectionCommand == null) { 1509 mSetSelectionCommand = new SetSelectionCommand(); 1510 } else { 1511 removeCallbacks(mSetSelectionCommand); 1512 } 1513 mSetSelectionCommand.mSelectionStart = selectionStart; 1514 mSetSelectionCommand.mSelectionEnd = selectionEnd; 1515 post(mSetSelectionCommand); 1516 } 1517 1518 /** 1519 * Posts an {@link AdjustScrollerCommand} within the given <code> 1520 * delayMillis</code> 1521 * . 1522 */ 1523 private void postAdjustScrollerCommand(int delayMillis) { 1524 if (mAdjustScrollerCommand == null) { 1525 mAdjustScrollerCommand = new AdjustScrollerCommand(); 1526 } else { 1527 removeCallbacks(mAdjustScrollerCommand); 1528 } 1529 postDelayed(mAdjustScrollerCommand, delayMillis); 1530 } 1531 1532 /** 1533 * Filter for accepting only valid indices or prefixes of the string 1534 * representation of valid indices. 1535 */ 1536 class InputTextFilter extends NumberKeyListener { 1537 1538 // XXX This doesn't allow for range limits when controlled by a 1539 // soft input method! 1540 public int getInputType() { 1541 return InputType.TYPE_CLASS_TEXT; 1542 } 1543 1544 @Override 1545 protected char[] getAcceptedChars() { 1546 return DIGIT_CHARACTERS; 1547 } 1548 1549 @Override 1550 public CharSequence filter(CharSequence source, int start, int end, Spanned dest, 1551 int dstart, int dend) { 1552 if (mDisplayedValues == null) { 1553 CharSequence filtered = super.filter(source, start, end, dest, dstart, dend); 1554 if (filtered == null) { 1555 filtered = source.subSequence(start, end); 1556 } 1557 1558 String result = String.valueOf(dest.subSequence(0, dstart)) + filtered 1559 + dest.subSequence(dend, dest.length()); 1560 1561 if ("".equals(result)) { 1562 return result; 1563 } 1564 int val = getSelectedPos(result); 1565 1566 /* 1567 * Ensure the user can't type in a value greater than the max 1568 * allowed. We have to allow less than min as the user might 1569 * want to delete some numbers and then type a new number. 1570 */ 1571 if (val > mMaxValue) { 1572 return ""; 1573 } else { 1574 return filtered; 1575 } 1576 } else { 1577 CharSequence filtered = String.valueOf(source.subSequence(start, end)); 1578 if (TextUtils.isEmpty(filtered)) { 1579 return ""; 1580 } 1581 String result = String.valueOf(dest.subSequence(0, dstart)) + filtered 1582 + dest.subSequence(dend, dest.length()); 1583 String str = String.valueOf(result).toLowerCase(); 1584 for (String val : mDisplayedValues) { 1585 String valLowerCase = val.toLowerCase(); 1586 if (valLowerCase.startsWith(str)) { 1587 postSetSelectionCommand(result.length(), val.length()); 1588 return val.subSequence(dstart, val.length()); 1589 } 1590 } 1591 return ""; 1592 } 1593 } 1594 } 1595 1596 /** 1597 * Command for setting the input text selection. 1598 */ 1599 class SetSelectionCommand implements Runnable { 1600 private int mSelectionStart; 1601 1602 private int mSelectionEnd; 1603 1604 public void run() { 1605 mInputText.setSelection(mSelectionStart, mSelectionEnd); 1606 } 1607 } 1608 1609 /** 1610 * Command for adjusting the scroller to show in its center the closest of 1611 * the displayed items. 1612 */ 1613 class AdjustScrollerCommand implements Runnable { 1614 public void run() { 1615 mPreviousScrollerY = 0; 1616 if (mInitialScrollOffset == mCurrentScrollOffset) { 1617 updateInputTextView(); 1618 showInputControls(mShowInputControlsAnimimationDuration); 1619 return; 1620 } 1621 // adjust to the closest value 1622 int deltaY = mInitialScrollOffset - mCurrentScrollOffset; 1623 if (Math.abs(deltaY) > mSelectorElementHeight / 2) { 1624 deltaY += (deltaY > 0) ? -mSelectorElementHeight : mSelectorElementHeight; 1625 } 1626 mAdjustScroller.startScroll(0, 0, 0, deltaY, SELECTOR_ADJUSTMENT_DURATION_MILLIS); 1627 invalidate(); 1628 } 1629 } 1630 1631 /** 1632 * Command for updating the current value from a long press. 1633 */ 1634 class UpdateValueFromLongPressCommand implements Runnable { 1635 private int mUpdateStep = 0; 1636 1637 private void setUpdateStep(int updateStep) { 1638 mUpdateStep = updateStep; 1639 } 1640 1641 public void run() { 1642 changeCurrent(mValue + mUpdateStep); 1643 postDelayed(this, mLongPressUpdateInterval); 1644 } 1645 } 1646} 1647