NumberPicker.java revision f66adbe7565ad5dbb75c07dbf36212beeaa582fb
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 && !isInEditMode()) { 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 hideInputControls(); 612 mBeginEditOnUpEvent = false; 613 mAdjustScrollerOnUpEvent = true; 614 if (mDrawSelectorWheel) { 615 boolean scrollersFinished = mFlingScroller.isFinished() 616 && mAdjustScroller.isFinished(); 617 if (!scrollersFinished) { 618 mFlingScroller.forceFinished(true); 619 mAdjustScroller.forceFinished(true); 620 onScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); 621 } 622 mBeginEditOnUpEvent = scrollersFinished; 623 mAdjustScrollerOnUpEvent = true; 624 return true; 625 } 626 if (isEventInViewHitRect(event, mInputText) 627 || (!mIncrementButton.isShown() 628 && isEventInViewHitRect(event, mIncrementButton)) 629 || (!mDecrementButton.isShown() 630 && isEventInViewHitRect(event, mDecrementButton))) { 631 mAdjustScrollerOnUpEvent = false; 632 setDrawSelectorWheel(true); 633 return true; 634 } 635 break; 636 case MotionEvent.ACTION_MOVE: 637 float currentMoveY = event.getY(); 638 int deltaDownY = (int) Math.abs(currentMoveY - mLastDownEventY); 639 if (deltaDownY > mTouchSlop) { 640 mBeginEditOnUpEvent = false; 641 onScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL); 642 setDrawSelectorWheel(true); 643 return true; 644 } 645 break; 646 } 647 return false; 648 } 649 650 @Override 651 public boolean onTouchEvent(MotionEvent ev) { 652 if (!isEnabled()) { 653 return false; 654 } 655 if (mVelocityTracker == null) { 656 mVelocityTracker = VelocityTracker.obtain(); 657 } 658 mVelocityTracker.addMovement(ev); 659 int action = ev.getActionMasked(); 660 switch (action) { 661 case MotionEvent.ACTION_MOVE: 662 float currentMoveY = ev.getY(); 663 if (mBeginEditOnUpEvent 664 || mScrollState != OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) { 665 int deltaDownY = (int) Math.abs(currentMoveY - mLastDownEventY); 666 if (deltaDownY > mTouchSlop) { 667 mBeginEditOnUpEvent = false; 668 onScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL); 669 } 670 } 671 int deltaMoveY = (int) (currentMoveY - mLastMotionEventY); 672 scrollBy(0, deltaMoveY); 673 invalidate(); 674 mLastMotionEventY = currentMoveY; 675 break; 676 case MotionEvent.ACTION_UP: 677 if (mBeginEditOnUpEvent) { 678 setDrawSelectorWheel(false); 679 showInputControls(mShowInputControlsAnimimationDuration); 680 mInputText.requestFocus(); 681 InputMethodManager imm = (InputMethodManager) getContext().getSystemService( 682 Context.INPUT_METHOD_SERVICE); 683 imm.showSoftInput(mInputText, 0); 684 mInputText.setSelection(0, mInputText.getText().length()); 685 return true; 686 } 687 VelocityTracker velocityTracker = mVelocityTracker; 688 velocityTracker.computeCurrentVelocity(1000, mMaximumFlingVelocity); 689 int initialVelocity = (int) velocityTracker.getYVelocity(); 690 if (Math.abs(initialVelocity) > mMinimumFlingVelocity) { 691 fling(initialVelocity); 692 onScrollStateChange(OnScrollListener.SCROLL_STATE_FLING); 693 } else { 694 if (mAdjustScrollerOnUpEvent) { 695 if (mFlingScroller.isFinished() && mAdjustScroller.isFinished()) { 696 postAdjustScrollerCommand(0); 697 } 698 } else { 699 postAdjustScrollerCommand(SHOW_INPUT_CONTROLS_DELAY_MILLIS); 700 } 701 } 702 mVelocityTracker.recycle(); 703 mVelocityTracker = null; 704 break; 705 } 706 return true; 707 } 708 709 @Override 710 public boolean dispatchTouchEvent(MotionEvent event) { 711 int action = event.getActionMasked(); 712 if ((action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) 713 && !isEventInViewHitRect(event, mInputText)) { 714 removeAllCallbacks(); 715 } 716 return super.dispatchTouchEvent(event); 717 } 718 719 @Override 720 public boolean dispatchKeyEvent(KeyEvent event) { 721 int keyCode = event.getKeyCode(); 722 if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER || keyCode == KeyEvent.KEYCODE_ENTER) { 723 removeAllCallbacks(); 724 } 725 return super.dispatchKeyEvent(event); 726 } 727 728 @Override 729 public boolean dispatchTrackballEvent(MotionEvent event) { 730 int action = event.getActionMasked(); 731 if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) { 732 removeAllCallbacks(); 733 } 734 return super.dispatchTrackballEvent(event); 735 } 736 737 @Override 738 public void computeScroll() { 739 if (!mDrawSelectorWheel) { 740 return; 741 } 742 Scroller scroller = mFlingScroller; 743 if (scroller.isFinished()) { 744 scroller = mAdjustScroller; 745 if (scroller.isFinished()) { 746 return; 747 } 748 } 749 scroller.computeScrollOffset(); 750 int currentScrollerY = scroller.getCurrY(); 751 if (mPreviousScrollerY == 0) { 752 mPreviousScrollerY = scroller.getStartY(); 753 } 754 scrollBy(0, currentScrollerY - mPreviousScrollerY); 755 mPreviousScrollerY = currentScrollerY; 756 if (scroller.isFinished()) { 757 onScrollerFinished(scroller); 758 } else { 759 invalidate(); 760 } 761 } 762 763 @Override 764 public void setEnabled(boolean enabled) { 765 super.setEnabled(enabled); 766 mIncrementButton.setEnabled(enabled); 767 mDecrementButton.setEnabled(enabled); 768 mInputText.setEnabled(enabled); 769 } 770 771 @Override 772 public void scrollBy(int x, int y) { 773 int[] selectorIndices = getSelectorIndices(); 774 if (!mWrapSelectorWheel && y > 0 775 && selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] <= mMinValue) { 776 mCurrentScrollOffset = mInitialScrollOffset; 777 return; 778 } 779 if (!mWrapSelectorWheel && y < 0 780 && selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] >= mMaxValue) { 781 mCurrentScrollOffset = mInitialScrollOffset; 782 return; 783 } 784 mCurrentScrollOffset += y; 785 while (mCurrentScrollOffset - mInitialScrollOffset >= mSelectorElementHeight) { 786 mCurrentScrollOffset -= mSelectorElementHeight; 787 decrementSelectorIndices(selectorIndices); 788 changeCurrent(selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX]); 789 if (selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] <= mMinValue) { 790 mCurrentScrollOffset = mInitialScrollOffset; 791 } 792 } 793 while (mCurrentScrollOffset - mInitialScrollOffset <= -mSelectorElementHeight) { 794 mCurrentScrollOffset += mSelectorElementHeight; 795 incrementScrollSelectorIndices(selectorIndices); 796 changeCurrent(selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX]); 797 if (selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] >= mMaxValue) { 798 mCurrentScrollOffset = mInitialScrollOffset; 799 } 800 } 801 } 802 803 @Override 804 public int getSolidColor() { 805 return mSolidColor; 806 } 807 808 /** 809 * Sets the listener to be notified on change of the current value. 810 * 811 * @param onValueChangedListener The listener. 812 */ 813 public void setOnValueChangedListener(OnValueChangeListener onValueChangedListener) { 814 mOnValueChangeListener = onValueChangedListener; 815 } 816 817 /** 818 * Set listener to be notified for scroll state changes. 819 * 820 * @param onScrollListener The listener. 821 */ 822 public void setOnScrollListener(OnScrollListener onScrollListener) { 823 mOnScrollListener = onScrollListener; 824 } 825 826 /** 827 * Set the formatter to be used for formatting the current value. 828 * <p> 829 * Note: If you have provided alternative values for the values this 830 * formatter is never invoked. 831 * </p> 832 * 833 * @param formatter The formatter object. If formatter is <code>null</code>, 834 * {@link String#valueOf(int)} will be used. 835 * 836 * @see #setDisplayedValues(String[]) 837 */ 838 public void setFormatter(Formatter formatter) { 839 if (formatter == mFormatter) { 840 return; 841 } 842 mFormatter = formatter; 843 resetSelectorWheelIndices(); 844 updateInputTextView(); 845 } 846 847 /** 848 * Set the current value for the number picker. 849 * <p> 850 * If the argument is less than the {@link NumberPicker#getMinValue()} and 851 * {@link NumberPicker#getWrapSelectorWheel()} is <code>false</code> the 852 * current value is set to the {@link NumberPicker#getMinValue()} value. 853 * </p> 854 * <p> 855 * If the argument is less than the {@link NumberPicker#getMinValue()} and 856 * {@link NumberPicker#getWrapSelectorWheel()} is <code>true</code> the 857 * current value is set to the {@link NumberPicker#getMaxValue()} value. 858 * </p> 859 * <p> 860 * If the argument is less than the {@link NumberPicker#getMaxValue()} and 861 * {@link NumberPicker#getWrapSelectorWheel()} is <code>false</code> the 862 * current value is set to the {@link NumberPicker#getMaxValue()} value. 863 * </p> 864 * <p> 865 * If the argument is less than the {@link NumberPicker#getMaxValue()} and 866 * {@link NumberPicker#getWrapSelectorWheel()} is <code>true</code> the 867 * current value is set to the {@link NumberPicker#getMinValue()} value. 868 * </p> 869 * 870 * @param value The current value. 871 * @see #setWrapSelectorWheel(boolean) 872 * @see #setMinValue(int) 873 * @see #setMaxValue(int) 874 */ 875 public void setValue(int value) { 876 if (mValue == value) { 877 return; 878 } 879 if (value < mMinValue) { 880 value = mWrapSelectorWheel ? mMaxValue : mMinValue; 881 } 882 if (value > mMaxValue) { 883 value = mWrapSelectorWheel ? mMinValue : mMaxValue; 884 } 885 mValue = value; 886 updateInputTextView(); 887 updateIncrementAndDecrementButtonsVisibilityState(); 888 } 889 890 /** 891 * Gets whether the selector wheel wraps when reaching the min/max value. 892 * 893 * @return True if the selector wheel wraps. 894 * 895 * @see #getMinValue() 896 * @see #getMaxValue() 897 */ 898 public boolean getWrapSelectorWheel() { 899 return mWrapSelectorWheel; 900 } 901 902 /** 903 * Sets whether the selector wheel shown during flinging/scrolling should 904 * wrap around the {@link NumberPicker#getMinValue()} and 905 * {@link NumberPicker#getMaxValue()} values. 906 * <p> 907 * By default if the range (max - min) is more than five (the number of 908 * items shown on the selector wheel) the selector wheel wrapping is 909 * enabled. 910 * </p> 911 * 912 * @param wrapSelector Whether to wrap. 913 */ 914 public void setWrapSelectorWheel(boolean wrapSelector) { 915 if (wrapSelector && (mMaxValue - mMinValue) < mSelectorIndices.length) { 916 throw new IllegalStateException("Range less than selector items count."); 917 } 918 if (wrapSelector != mWrapSelectorWheel) { 919 // force the selector indices array to be reinitialized 920 mSelectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] = Integer.MAX_VALUE; 921 mWrapSelectorWheel = wrapSelector; 922 // force redraw since we might look different 923 updateIncrementAndDecrementButtonsVisibilityState(); 924 } 925 } 926 927 /** 928 * Sets the speed at which the numbers be incremented and decremented when 929 * the up and down buttons are long pressed respectively. 930 * <p> 931 * The default value is 300 ms. 932 * </p> 933 * 934 * @param intervalMillis The speed (in milliseconds) at which the numbers 935 * will be incremented and decremented. 936 */ 937 public void setOnLongPressUpdateInterval(long intervalMillis) { 938 mLongPressUpdateInterval = intervalMillis; 939 } 940 941 /** 942 * Returns the value of the picker. 943 * 944 * @return The value. 945 */ 946 public int getValue() { 947 return mValue; 948 } 949 950 /** 951 * Returns the min value of the picker. 952 * 953 * @return The min value 954 */ 955 public int getMinValue() { 956 return mMinValue; 957 } 958 959 /** 960 * Sets the min value of the picker. 961 * 962 * @param minValue The min value. 963 */ 964 public void setMinValue(int minValue) { 965 if (mMinValue == minValue) { 966 return; 967 } 968 if (minValue < 0) { 969 throw new IllegalArgumentException("minValue must be >= 0"); 970 } 971 mMinValue = minValue; 972 if (mMinValue > mValue) { 973 mValue = mMinValue; 974 } 975 boolean wrapSelectorWheel = mMaxValue - mMinValue > mSelectorIndices.length; 976 setWrapSelectorWheel(wrapSelectorWheel); 977 resetSelectorWheelIndices(); 978 updateInputTextView(); 979 } 980 981 /** 982 * Returns the max value of the picker. 983 * 984 * @return The max value. 985 */ 986 public int getMaxValue() { 987 return mMaxValue; 988 } 989 990 /** 991 * Sets the max value of the picker. 992 * 993 * @param maxValue The max value. 994 */ 995 public void setMaxValue(int maxValue) { 996 if (mMaxValue == maxValue) { 997 return; 998 } 999 if (maxValue < 0) { 1000 throw new IllegalArgumentException("maxValue must be >= 0"); 1001 } 1002 mMaxValue = maxValue; 1003 if (mMaxValue < mValue) { 1004 mValue = mMaxValue; 1005 } 1006 boolean wrapSelectorWheel = mMaxValue - mMinValue > mSelectorIndices.length; 1007 setWrapSelectorWheel(wrapSelectorWheel); 1008 resetSelectorWheelIndices(); 1009 updateInputTextView(); 1010 } 1011 1012 /** 1013 * Gets the values to be displayed instead of string values. 1014 * 1015 * @return The displayed values. 1016 */ 1017 public String[] getDisplayedValues() { 1018 return mDisplayedValues; 1019 } 1020 1021 /** 1022 * Sets the values to be displayed. 1023 * 1024 * @param displayedValues The displayed values. 1025 */ 1026 public void setDisplayedValues(String[] displayedValues) { 1027 if (mDisplayedValues == displayedValues) { 1028 return; 1029 } 1030 mDisplayedValues = displayedValues; 1031 if (mDisplayedValues != null) { 1032 // Allow text entry rather than strictly numeric entry. 1033 mInputText.setRawInputType(InputType.TYPE_CLASS_TEXT 1034 | InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS); 1035 } else { 1036 mInputText.setRawInputType(InputType.TYPE_CLASS_NUMBER); 1037 } 1038 updateInputTextView(); 1039 resetSelectorWheelIndices(); 1040 } 1041 1042 @Override 1043 protected float getTopFadingEdgeStrength() { 1044 return TOP_AND_BOTTOM_FADING_EDGE_STRENGTH; 1045 } 1046 1047 @Override 1048 protected float getBottomFadingEdgeStrength() { 1049 return TOP_AND_BOTTOM_FADING_EDGE_STRENGTH; 1050 } 1051 1052 @Override 1053 protected void onAttachedToWindow() { 1054 super.onAttachedToWindow(); 1055 // make sure we show the controls only the very 1056 // first time the user sees this widget 1057 if (mFlingable && !isInEditMode()) { 1058 // animate a bit slower the very first time 1059 showInputControls(mShowInputControlsAnimimationDuration * 2); 1060 } 1061 } 1062 1063 @Override 1064 protected void onDetachedFromWindow() { 1065 removeAllCallbacks(); 1066 } 1067 1068 @Override 1069 protected void dispatchDraw(Canvas canvas) { 1070 // There is a good reason for doing this. See comments in draw(). 1071 } 1072 1073 @Override 1074 public void draw(Canvas canvas) { 1075 // Dispatch draw to our children only if we are not currently running 1076 // the animation for simultaneously fading out the scroll wheel and 1077 // showing in the buttons. This class takes advantage of the View 1078 // implementation of fading edges effect to draw the selector wheel. 1079 // However, in View.draw(), the fading is applied after all the children 1080 // have been drawn and we do not want this fading to be applied to the 1081 // buttons which are currently showing in. Therefore, we draw our 1082 // children after we have completed drawing ourselves. 1083 super.draw(canvas); 1084 1085 // Draw our children if we are not showing the selector wheel of fading 1086 // it out 1087 if (mShowInputControlsAnimator.isRunning() || !mDrawSelectorWheel) { 1088 long drawTime = getDrawingTime(); 1089 for (int i = 0, count = getChildCount(); i < count; i++) { 1090 View child = getChildAt(i); 1091 if (!child.isShown()) { 1092 continue; 1093 } 1094 drawChild(canvas, getChildAt(i), drawTime); 1095 } 1096 } 1097 } 1098 1099 @Override 1100 protected void onDraw(Canvas canvas) { 1101 // we only draw the selector wheel 1102 if (!mDrawSelectorWheel) { 1103 return; 1104 } 1105 float x = (mRight - mLeft) / 2; 1106 float y = mCurrentScrollOffset; 1107 1108 // draw the selector wheel 1109 int[] selectorIndices = getSelectorIndices(); 1110 for (int i = 0; i < selectorIndices.length; i++) { 1111 int selectorIndex = selectorIndices[i]; 1112 String scrollSelectorValue = mSelectorIndexToStringCache.get(selectorIndex); 1113 canvas.drawText(scrollSelectorValue, x, y, mSelectorPaint); 1114 y += mSelectorElementHeight; 1115 } 1116 1117 // draw the selection dividers (only if scrolling and drawable specified) 1118 if (mSelectionDivider != null) { 1119 mSelectionDivider.setAlpha(mSelectorPaint.getAlpha()); 1120 // draw the top divider 1121 int topOfTopDivider = 1122 (getHeight() - mSelectorElementHeight - mSelectionDividerHeight) / 2; 1123 int bottomOfTopDivider = topOfTopDivider + mSelectionDividerHeight; 1124 mSelectionDivider.setBounds(0, topOfTopDivider, mRight, bottomOfTopDivider); 1125 mSelectionDivider.draw(canvas); 1126 1127 // draw the bottom divider 1128 int topOfBottomDivider = topOfTopDivider + mSelectorElementHeight; 1129 int bottomOfBottomDivider = bottomOfTopDivider + mSelectorElementHeight; 1130 mSelectionDivider.setBounds(0, topOfBottomDivider, mRight, bottomOfBottomDivider); 1131 mSelectionDivider.draw(canvas); 1132 } 1133 } 1134 1135 /** 1136 * Resets the selector indices and clear the cached 1137 * string representation of these indices. 1138 */ 1139 private void resetSelectorWheelIndices() { 1140 mSelectorIndexToStringCache.clear(); 1141 int[] selectorIdices = getSelectorIndices(); 1142 for (int i = 0; i < selectorIdices.length; i++) { 1143 selectorIdices[i] = Integer.MIN_VALUE; 1144 } 1145 } 1146 1147 /** 1148 * Sets the current value of this NumberPicker, and sets mPrevious to the 1149 * previous value. If current is greater than mEnd less than mStart, the 1150 * value of mCurrent is wrapped around. Subclasses can override this to 1151 * change the wrapping behavior 1152 * 1153 * @param current the new value of the NumberPicker 1154 */ 1155 private void changeCurrent(int current) { 1156 if (mValue == current) { 1157 return; 1158 } 1159 // Wrap around the values if we go past the start or end 1160 if (mWrapSelectorWheel) { 1161 current = getWrappedSelectorIndex(current); 1162 } 1163 int previous = mValue; 1164 setValue(current); 1165 notifyChange(previous, current); 1166 } 1167 1168 /** 1169 * Sets the <code>alpha</code> of the {@link Paint} for drawing the selector 1170 * wheel. 1171 */ 1172 @SuppressWarnings("unused") 1173 // Called by ShowInputControlsAnimator via reflection 1174 private void setSelectorPaintAlpha(int alpha) { 1175 mSelectorPaint.setAlpha(alpha); 1176 if (mDrawSelectorWheel) { 1177 invalidate(); 1178 } 1179 } 1180 1181 /** 1182 * @return If the <code>event</code> is in the <code>view</code>. 1183 */ 1184 private boolean isEventInViewHitRect(MotionEvent event, View view) { 1185 view.getHitRect(mTempRect); 1186 return mTempRect.contains((int) event.getX(), (int) event.getY()); 1187 } 1188 1189 /** 1190 * Sets if to <code>drawSelectionWheel</code>. 1191 */ 1192 private void setDrawSelectorWheel(boolean drawSelectorWheel) { 1193 mDrawSelectorWheel = drawSelectorWheel; 1194 // do not fade if the selector wheel not shown 1195 setVerticalFadingEdgeEnabled(drawSelectorWheel); 1196 } 1197 1198 private void initializeScrollWheel() { 1199 if (mInitialScrollOffset != Integer.MIN_VALUE) { 1200 return; 1201 1202 } 1203 int[] selectorIndices = getSelectorIndices(); 1204 int totalTextHeight = selectorIndices.length * mTextSize; 1205 int totalTextGapHeight = (mBottom - mTop) - totalTextHeight; 1206 int textGapCount = selectorIndices.length - 1; 1207 int selectorTextGapHeight = totalTextGapHeight / textGapCount; 1208 // compensate for integer division loss of the components used to 1209 // calculate the text gap 1210 int integerDivisionLoss = (mTextSize + mBottom - mTop) % textGapCount; 1211 mInitialScrollOffset = mCurrentScrollOffset = mTextSize - integerDivisionLoss / 2; 1212 mSelectorElementHeight = mTextSize + selectorTextGapHeight; 1213 updateInputTextView(); 1214 } 1215 1216 /** 1217 * Callback invoked upon completion of a given <code>scroller</code>. 1218 */ 1219 private void onScrollerFinished(Scroller scroller) { 1220 if (scroller == mFlingScroller) { 1221 postAdjustScrollerCommand(0); 1222 onScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); 1223 } else { 1224 updateInputTextView(); 1225 showInputControls(mShowInputControlsAnimimationDuration); 1226 } 1227 } 1228 1229 /** 1230 * Handles transition to a given <code>scrollState</code> 1231 */ 1232 private void onScrollStateChange(int scrollState) { 1233 if (mScrollState == scrollState) { 1234 return; 1235 } 1236 mScrollState = scrollState; 1237 if (mOnScrollListener != null) { 1238 mOnScrollListener.onScrollStateChange(this, scrollState); 1239 } 1240 } 1241 1242 /** 1243 * Flings the selector with the given <code>velocityY</code>. 1244 */ 1245 private void fling(int velocityY) { 1246 mPreviousScrollerY = 0; 1247 Scroller flingScroller = mFlingScroller; 1248 1249 if (mWrapSelectorWheel) { 1250 if (velocityY > 0) { 1251 flingScroller.fling(0, 0, 0, velocityY, 0, 0, 0, Integer.MAX_VALUE); 1252 } else { 1253 flingScroller.fling(0, Integer.MAX_VALUE, 0, velocityY, 0, 0, 0, Integer.MAX_VALUE); 1254 } 1255 } else { 1256 if (velocityY > 0) { 1257 int maxY = mTextSize * (mValue - mMinValue); 1258 flingScroller.fling(0, 0, 0, velocityY, 0, 0, 0, maxY); 1259 } else { 1260 int startY = mTextSize * (mMaxValue - mValue); 1261 int maxY = startY; 1262 flingScroller.fling(0, startY, 0, velocityY, 0, 0, 0, maxY); 1263 } 1264 } 1265 1266 invalidate(); 1267 } 1268 1269 /** 1270 * Hides the input controls which is the up/down arrows and the text field. 1271 */ 1272 private void hideInputControls() { 1273 mShowInputControlsAnimator.cancel(); 1274 mIncrementButton.setVisibility(INVISIBLE); 1275 mDecrementButton.setVisibility(INVISIBLE); 1276 mInputText.setVisibility(INVISIBLE); 1277 } 1278 1279 /** 1280 * Show the input controls by making them visible and animating the alpha 1281 * property up/down arrows. 1282 * 1283 * @param animationDuration The duration of the animation. 1284 */ 1285 private void showInputControls(long animationDuration) { 1286 updateIncrementAndDecrementButtonsVisibilityState(); 1287 mInputText.setVisibility(VISIBLE); 1288 mShowInputControlsAnimator.setDuration(animationDuration); 1289 mShowInputControlsAnimator.start(); 1290 } 1291 1292 /** 1293 * Updates the visibility state of the increment and decrement buttons. 1294 */ 1295 private void updateIncrementAndDecrementButtonsVisibilityState() { 1296 if (mWrapSelectorWheel || mValue < mMaxValue) { 1297 mIncrementButton.setVisibility(VISIBLE); 1298 } else { 1299 mIncrementButton.setVisibility(INVISIBLE); 1300 } 1301 if (mWrapSelectorWheel || mValue > mMinValue) { 1302 mDecrementButton.setVisibility(VISIBLE); 1303 } else { 1304 mDecrementButton.setVisibility(INVISIBLE); 1305 } 1306 } 1307 1308 /** 1309 * @return The selector indices array with proper values with the current as 1310 * the middle one. 1311 */ 1312 private int[] getSelectorIndices() { 1313 int current = getValue(); 1314 if (mSelectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] != current) { 1315 for (int i = 0; i < mSelectorIndices.length; i++) { 1316 int selectorIndex = current + (i - SELECTOR_MIDDLE_ITEM_INDEX); 1317 if (mWrapSelectorWheel) { 1318 selectorIndex = getWrappedSelectorIndex(selectorIndex); 1319 } 1320 mSelectorIndices[i] = selectorIndex; 1321 ensureCachedScrollSelectorValue(mSelectorIndices[i]); 1322 } 1323 } 1324 return mSelectorIndices; 1325 } 1326 1327 /** 1328 * @return The wrapped index <code>selectorIndex</code> value. 1329 */ 1330 private int getWrappedSelectorIndex(int selectorIndex) { 1331 if (selectorIndex > mMaxValue) { 1332 return mMinValue + (selectorIndex - mMaxValue) % (mMaxValue - mMinValue) - 1; 1333 } else if (selectorIndex < mMinValue) { 1334 return mMaxValue - (mMinValue - selectorIndex) % (mMaxValue - mMinValue) + 1; 1335 } 1336 return selectorIndex; 1337 } 1338 1339 /** 1340 * Increments the <code>selectorIndices</code> whose string representations 1341 * will be displayed in the selector. 1342 */ 1343 private void incrementScrollSelectorIndices(int[] selectorIndices) { 1344 for (int i = 0; i < selectorIndices.length - 1; i++) { 1345 selectorIndices[i] = selectorIndices[i + 1]; 1346 } 1347 int nextScrollSelectorIndex = selectorIndices[selectorIndices.length - 2] + 1; 1348 if (mWrapSelectorWheel && nextScrollSelectorIndex > mMaxValue) { 1349 nextScrollSelectorIndex = mMinValue; 1350 } 1351 selectorIndices[selectorIndices.length - 1] = nextScrollSelectorIndex; 1352 ensureCachedScrollSelectorValue(nextScrollSelectorIndex); 1353 } 1354 1355 /** 1356 * Decrements the <code>selectorIndices</code> whose string representations 1357 * will be displayed in the selector. 1358 */ 1359 private void decrementSelectorIndices(int[] selectorIndices) { 1360 for (int i = selectorIndices.length - 1; i > 0; i--) { 1361 selectorIndices[i] = selectorIndices[i - 1]; 1362 } 1363 int nextScrollSelectorIndex = selectorIndices[1] - 1; 1364 if (mWrapSelectorWheel && nextScrollSelectorIndex < mMinValue) { 1365 nextScrollSelectorIndex = mMaxValue; 1366 } 1367 selectorIndices[0] = nextScrollSelectorIndex; 1368 ensureCachedScrollSelectorValue(nextScrollSelectorIndex); 1369 } 1370 1371 /** 1372 * Ensures we have a cached string representation of the given <code> 1373 * selectorIndex</code> 1374 * to avoid multiple instantiations of the same string. 1375 */ 1376 private void ensureCachedScrollSelectorValue(int selectorIndex) { 1377 SparseArray<String> cache = mSelectorIndexToStringCache; 1378 String scrollSelectorValue = cache.get(selectorIndex); 1379 if (scrollSelectorValue != null) { 1380 return; 1381 } 1382 if (selectorIndex < mMinValue || selectorIndex > mMaxValue) { 1383 scrollSelectorValue = ""; 1384 } else { 1385 if (mDisplayedValues != null) { 1386 int displayedValueIndex = selectorIndex - mMinValue; 1387 scrollSelectorValue = mDisplayedValues[displayedValueIndex]; 1388 } else { 1389 scrollSelectorValue = formatNumber(selectorIndex); 1390 } 1391 } 1392 cache.put(selectorIndex, scrollSelectorValue); 1393 } 1394 1395 private String formatNumber(int value) { 1396 return (mFormatter != null) ? mFormatter.format(value) : String.valueOf(value); 1397 } 1398 1399 private void validateInputTextView(View v) { 1400 String str = String.valueOf(((TextView) v).getText()); 1401 if (TextUtils.isEmpty(str)) { 1402 // Restore to the old value as we don't allow empty values 1403 updateInputTextView(); 1404 } else { 1405 // Check the new value and ensure it's in range 1406 int current = getSelectedPos(str.toString()); 1407 changeCurrent(current); 1408 } 1409 } 1410 1411 /** 1412 * Updates the view of this NumberPicker. If displayValues were specified in 1413 * the string corresponding to the index specified by the current value will 1414 * be returned. Otherwise, the formatter specified in {@link #setFormatter} 1415 * will be used to format the number. 1416 */ 1417 private void updateInputTextView() { 1418 /* 1419 * If we don't have displayed values then use the current number else 1420 * find the correct value in the displayed values for the current 1421 * number. 1422 */ 1423 if (mDisplayedValues == null) { 1424 mInputText.setText(formatNumber(mValue)); 1425 } else { 1426 mInputText.setText(mDisplayedValues[mValue - mMinValue]); 1427 } 1428 mInputText.setSelection(mInputText.getText().length()); 1429 } 1430 1431 /** 1432 * Notifies the listener, if registered, of a change of the value of this 1433 * NumberPicker. 1434 */ 1435 private void notifyChange(int previous, int current) { 1436 if (mOnValueChangeListener != null) { 1437 mOnValueChangeListener.onValueChange(this, previous, mValue); 1438 } 1439 } 1440 1441 /** 1442 * Posts a command for updating the current value every <code>updateMillis 1443 * </code>. 1444 */ 1445 private void postUpdateValueFromLongPress(int updateMillis) { 1446 mInputText.clearFocus(); 1447 removeAllCallbacks(); 1448 if (mUpdateFromLongPressCommand == null) { 1449 mUpdateFromLongPressCommand = new UpdateValueFromLongPressCommand(); 1450 } 1451 mUpdateFromLongPressCommand.setUpdateStep(updateMillis); 1452 post(mUpdateFromLongPressCommand); 1453 } 1454 1455 /** 1456 * Removes all pending callback from the message queue. 1457 */ 1458 private void removeAllCallbacks() { 1459 if (mUpdateFromLongPressCommand != null) { 1460 removeCallbacks(mUpdateFromLongPressCommand); 1461 } 1462 if (mAdjustScrollerCommand != null) { 1463 removeCallbacks(mAdjustScrollerCommand); 1464 } 1465 if (mSetSelectionCommand != null) { 1466 removeCallbacks(mSetSelectionCommand); 1467 } 1468 } 1469 1470 /** 1471 * @return The selected index given its displayed <code>value</code>. 1472 */ 1473 private int getSelectedPos(String value) { 1474 if (mDisplayedValues == null) { 1475 try { 1476 return Integer.parseInt(value); 1477 } catch (NumberFormatException e) { 1478 // Ignore as if it's not a number we don't care 1479 } 1480 } else { 1481 for (int i = 0; i < mDisplayedValues.length; i++) { 1482 // Don't force the user to type in jan when ja will do 1483 value = value.toLowerCase(); 1484 if (mDisplayedValues[i].toLowerCase().startsWith(value)) { 1485 return mMinValue + i; 1486 } 1487 } 1488 1489 /* 1490 * The user might have typed in a number into the month field i.e. 1491 * 10 instead of OCT so support that too. 1492 */ 1493 try { 1494 return Integer.parseInt(value); 1495 } catch (NumberFormatException e) { 1496 1497 // Ignore as if it's not a number we don't care 1498 } 1499 } 1500 return mMinValue; 1501 } 1502 1503 /** 1504 * Posts an {@link SetSelectionCommand} from the given <code>selectionStart 1505 * </code> to 1506 * <code>selectionEnd</code>. 1507 */ 1508 private void postSetSelectionCommand(int selectionStart, int selectionEnd) { 1509 if (mSetSelectionCommand == null) { 1510 mSetSelectionCommand = new SetSelectionCommand(); 1511 } else { 1512 removeCallbacks(mSetSelectionCommand); 1513 } 1514 mSetSelectionCommand.mSelectionStart = selectionStart; 1515 mSetSelectionCommand.mSelectionEnd = selectionEnd; 1516 post(mSetSelectionCommand); 1517 } 1518 1519 /** 1520 * Posts an {@link AdjustScrollerCommand} within the given <code> 1521 * delayMillis</code> 1522 * . 1523 */ 1524 private void postAdjustScrollerCommand(int delayMillis) { 1525 if (mAdjustScrollerCommand == null) { 1526 mAdjustScrollerCommand = new AdjustScrollerCommand(); 1527 } else { 1528 removeCallbacks(mAdjustScrollerCommand); 1529 } 1530 postDelayed(mAdjustScrollerCommand, delayMillis); 1531 } 1532 1533 /** 1534 * Filter for accepting only valid indices or prefixes of the string 1535 * representation of valid indices. 1536 */ 1537 class InputTextFilter extends NumberKeyListener { 1538 1539 // XXX This doesn't allow for range limits when controlled by a 1540 // soft input method! 1541 public int getInputType() { 1542 return InputType.TYPE_CLASS_TEXT; 1543 } 1544 1545 @Override 1546 protected char[] getAcceptedChars() { 1547 return DIGIT_CHARACTERS; 1548 } 1549 1550 @Override 1551 public CharSequence filter(CharSequence source, int start, int end, Spanned dest, 1552 int dstart, int dend) { 1553 if (mDisplayedValues == null) { 1554 CharSequence filtered = super.filter(source, start, end, dest, dstart, dend); 1555 if (filtered == null) { 1556 filtered = source.subSequence(start, end); 1557 } 1558 1559 String result = String.valueOf(dest.subSequence(0, dstart)) + filtered 1560 + dest.subSequence(dend, dest.length()); 1561 1562 if ("".equals(result)) { 1563 return result; 1564 } 1565 int val = getSelectedPos(result); 1566 1567 /* 1568 * Ensure the user can't type in a value greater than the max 1569 * allowed. We have to allow less than min as the user might 1570 * want to delete some numbers and then type a new number. 1571 */ 1572 if (val > mMaxValue) { 1573 return ""; 1574 } else { 1575 return filtered; 1576 } 1577 } else { 1578 CharSequence filtered = String.valueOf(source.subSequence(start, end)); 1579 if (TextUtils.isEmpty(filtered)) { 1580 return ""; 1581 } 1582 String result = String.valueOf(dest.subSequence(0, dstart)) + filtered 1583 + dest.subSequence(dend, dest.length()); 1584 String str = String.valueOf(result).toLowerCase(); 1585 for (String val : mDisplayedValues) { 1586 String valLowerCase = val.toLowerCase(); 1587 if (valLowerCase.startsWith(str)) { 1588 postSetSelectionCommand(result.length(), val.length()); 1589 return val.subSequence(dstart, val.length()); 1590 } 1591 } 1592 return ""; 1593 } 1594 } 1595 } 1596 1597 /** 1598 * Command for setting the input text selection. 1599 */ 1600 class SetSelectionCommand implements Runnable { 1601 private int mSelectionStart; 1602 1603 private int mSelectionEnd; 1604 1605 public void run() { 1606 mInputText.setSelection(mSelectionStart, mSelectionEnd); 1607 } 1608 } 1609 1610 /** 1611 * Command for adjusting the scroller to show in its center the closest of 1612 * the displayed items. 1613 */ 1614 class AdjustScrollerCommand implements Runnable { 1615 public void run() { 1616 mPreviousScrollerY = 0; 1617 if (mInitialScrollOffset == mCurrentScrollOffset) { 1618 updateInputTextView(); 1619 showInputControls(mShowInputControlsAnimimationDuration); 1620 return; 1621 } 1622 // adjust to the closest value 1623 int deltaY = mInitialScrollOffset - mCurrentScrollOffset; 1624 if (Math.abs(deltaY) > mSelectorElementHeight / 2) { 1625 deltaY += (deltaY > 0) ? -mSelectorElementHeight : mSelectorElementHeight; 1626 } 1627 mAdjustScroller.startScroll(0, 0, 0, deltaY, SELECTOR_ADJUSTMENT_DURATION_MILLIS); 1628 invalidate(); 1629 } 1630 } 1631 1632 /** 1633 * Command for updating the current value from a long press. 1634 */ 1635 class UpdateValueFromLongPressCommand implements Runnable { 1636 private int mUpdateStep = 0; 1637 1638 private void setUpdateStep(int updateStep) { 1639 mUpdateStep = updateStep; 1640 } 1641 1642 public void run() { 1643 changeCurrent(mValue + mUpdateStep); 1644 postDelayed(this, mLongPressUpdateInterval); 1645 } 1646 } 1647} 1648