下面列出了android.view.KeyEvent#isConfirmKey ( ) 实例代码,或者点击链接到github查看源代码,也可以在右侧发表评论。
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
if (KeyEvent.isConfirmKey(keyCode)) {
if (mReceivedInvokeKeyDown) {
if (mItemCount > 0) {
dispatchPress(mSelectedChild);
postDelayed(new Runnable() {
@Override
public void run() {
dispatchUnpress();
}
}, ViewConfiguration.getPressedStateDuration());
int selectedIndex = mSelectedPosition - mFirstPosition;
performItemClick(getChildAt(selectedIndex), mSelectedPosition, mAdapter
.getItemId(mSelectedPosition));
}
}
// Clear the flag
mReceivedInvokeKeyDown = false;
return true;
}
return super.onKeyUp(keyCode, event);
}
/**
* Filter key up events. By forwarding key up events to this function,
* views using non-modal ListPopupWindow can have it handle key selection of items.
*
* @param keyCode keyCode param passed to the host view's onKeyUp
* @param event event param passed to the host view's onKeyUp
* @return true if the event was handled, false if it was ignored.
*
* @see #setModal(boolean)
* @see #onKeyDown(int, KeyEvent)
*/
public boolean onKeyUp(int keyCode, @NonNull KeyEvent event) {
if (isShowing() && mDropDownList.getSelectedItemPosition() >= 0) {
boolean consumed = mDropDownList.onKeyUp(keyCode, event);
if (consumed && KeyEvent.isConfirmKey(keyCode)) {
// if the list accepts the key events and the key event was a click, the text view
// gets the selected item from the drop down as its content
dismiss();
}
return consumed;
}
return false;
}
/**
* Filter key down events. By forwarding key down events to this function,
* views using non-modal ListPopupWindow can have it handle key selection of items.
*
* @param keyCode keyCode param passed to the host view's onKeyDown
* @param event event param passed to the host view's onKeyDown
* @return true if the event was handled, false if it was ignored.
*
* @see #setModal(boolean)
* @see #onKeyUp(int, KeyEvent)
*/
public boolean onKeyDown(int keyCode, @NonNull KeyEvent event) {
// when the drop down is shown, we drive it directly
if (isShowing()) {
// the key events are forwarded to the list in the drop down view
// note that ListView handles space but we don't want that to happen
// also if selection is not currently in the drop down, then don't
// let center or enter presses go there since that would cause it
// to select one of its items
if (keyCode != KeyEvent.KEYCODE_SPACE
&& (mDropDownList.getSelectedItemPosition() >= 0
|| !KeyEvent.isConfirmKey(keyCode))) {
int curIndex = mDropDownList.getSelectedItemPosition();
boolean consumed;
final boolean below = !mPopup.isAboveAnchor();
final ListAdapter adapter = mAdapter;
boolean allEnabled;
int firstItem = Integer.MAX_VALUE;
int lastItem = Integer.MIN_VALUE;
if (adapter != null) {
allEnabled = adapter.areAllItemsEnabled();
firstItem = allEnabled ? 0 :
mDropDownList.lookForSelectablePosition(0, true);
lastItem = allEnabled ? adapter.getCount() - 1 :
mDropDownList.lookForSelectablePosition(adapter.getCount() - 1, false);
}
if ((below && keyCode == KeyEvent.KEYCODE_DPAD_UP && curIndex <= firstItem) ||
(!below && keyCode == KeyEvent.KEYCODE_DPAD_DOWN && curIndex >= lastItem)) {
// When the selection is at the top, we block the key
// event to prevent focus from moving.
clearListSelection();
mPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);
show();
return true;
} else {
// WARNING: Please read the comment where mListSelectionHidden
// is declared
mDropDownList.setListSelectionHidden(false);
}
consumed = mDropDownList.onKeyDown(keyCode, event);
if (DEBUG) Log.v(TAG, "Key down: code=" + keyCode + " list consumed=" + consumed);
if (consumed) {
// If it handled the key event, then the user is
// navigating in the list, so we should put it in front.
mPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NOT_NEEDED);
// Here's a little trick we need to do to make sure that
// the list view is actually showing its focus indicator,
// by ensuring it has focus and getting its window out
// of touch mode.
mDropDownList.requestFocusFromTouch();
show();
switch (keyCode) {
// avoid passing the focus from the text view to the
// next component
case KeyEvent.KEYCODE_ENTER:
case KeyEvent.KEYCODE_DPAD_CENTER:
case KeyEvent.KEYCODE_DPAD_DOWN:
case KeyEvent.KEYCODE_DPAD_UP:
return true;
}
} else {
if (below && keyCode == KeyEvent.KEYCODE_DPAD_DOWN) {
// when the selection is at the bottom, we block the
// event to avoid going to the next focusable widget
if (curIndex == lastItem) {
return true;
}
} else if (!below && keyCode == KeyEvent.KEYCODE_DPAD_UP &&
curIndex == firstItem) {
return true;
}
}
}
}
return false;
}