Adding support to NumberPicker

Change-Id: I471b995c8d364c2bd5eef3ab0397c17fc77f6ccc

Author: sganov

core/java/android/widget/NumberPicker.java

@@ -469,6 +469,11 @@ public static final Formatter getTwoDigitFormatter() {
      */
     private final PressedStateHelper mPressedStateHelper;
 
+    /**
+     * The keycode of the last handled DPAD down event.
+     */
+    private int mLastHandledDownDpadKeyCode = -1;
+
     /**
      * Interface to listen for changes of the current value.
      */
@@ -936,6 +941,31 @@ public boolean dispatchKeyEvent(KeyEvent event) {
             case KeyEvent.KEYCODE_ENTER:
                 removeAllCallbacks();
                 break;
+            case KeyEvent.KEYCODE_DPAD_DOWN:
+            case KeyEvent.KEYCODE_DPAD_UP:
+                if (!mHasSelectorWheel) {
+                    break;
+                }
+                switch (event.getAction()) {
+                    case KeyEvent.ACTION_DOWN:
+                        if (mWrapSelectorWheel || (keyCode == KeyEvent.KEYCODE_DPAD_UP)
+                                ? getValue() < getMaxValue() : getValue() > getMinValue()) {
+                            requestFocus();
+                            mLastHandledDownDpadKeyCode = keyCode;
+                            removeAllCallbacks();
+                            if (mFlingScroller.isFinished()) {
+                                changeValueByOne(keyCode == KeyEvent.KEYCODE_DPAD_UP);
+                            }
+                            return true;
+                        }
+                        break;
+                    case KeyEvent.ACTION_UP:
+                        if (mLastHandledDownDpadKeyCode == keyCode) {
+                            mLastHandledDownDpadKeyCode = -1;
+                            return true;
+                        }
+                        break;
+                }
         }
         return super.dispatchKeyEvent(event);
     }