问题
I have a GridView with items which I defined in an adapter. Those items are composted by TextView and ImageView. I want to control the focus on GridView, It looks like this:
(1) (2) (3) (4)
when I press "right" on keyboard, focus move 1->2-3>4. I need disable the focus on 2, that is 1->3->4. I tried :
((GridView) view).getChildAt(mPosition).setNextFocusRightId(mGridView.getChildAt(mPosition+2).getId());
((GridView) view).getChildAt(mPosition + 2).requestFocus();
((GridView) view).setSelection(mPosition + 2);
on dispatchKeyEvent function when item selected on position 0. But it didn't work. And also I tried getChildAt(mPosition + 1).setSelected(false)
in the GridView onFocusChangeListener, and it did no good. I'm stuck by this problem. Please anyone who can give me a note?
回答1:
So for external keyboard i have one idea.
1.Declare one map
Map<View,View> right = new HashMap<View,View>();
View currentViewFocus;
2.Assign value of android UI control
void putValueOnDownMap(){
down.put(androidautocomextview1,textview2);
down.put(textview2, editetxt3);
down.put(editetxt3, button4);
down.put(button4, androidautocomextview1);
}
3. On key callback do this
View currentViewFocus = androidautocomextview1;
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
if(productname.hasFocus()){
if(keyCode == KeyEvent.KEYCODE_DPAD_DOWN){
View temp = currentViewFocus;
if(temp.getClass().equals(AutoCompleteTextView.class)){
/**
* First it will check that view class object belongs to which child class if it *belongs to autoComplete textview then it will type-cast super class object to child *class and call requestFocus() method to get focus.
*/
AutoCompleteTextView auto_temp = (AutoCompleteTextView)temp;
if(auto_temp.isPopupShowing()){
/**If popup is showing then on press of down D-pad in popup it should be remain
* navigate on popup
*/
auto_temp.requestFocus();
}
else{
/**Now we made our selection from autocomplete textview popup by “Enter key”
*Then time to navigate in textview2 . Pass currentViewFocus as key and get value *from down map again assign new value in currentViewFocus again check it child *class again type-cast and so on.
*/
temp = down.get(currentViewFocus);
currentViewFocus = temp;
if (temp == null){
}
else{
if(temp.getClass().equals(TextView.class)){
TextView txtv = (TextView)temp;
txtv.requestFocus();
currentViewFocus = temp;
}
else{
temp.performClick();
temp.requestFocus();
currentViewFocus = temp;
}
}
}
}
else{
// and so on we first check that class of super class
// type-cast according to child class
// perform stub.
}
}
//=====================================================================
/** So-far we are navigating through D-pad down key now suppose that our current
* focus on editetxt3 and we want to navigate through D-pad UP key.
*/
if(keyCode == KeyEvent.KEYCODE_DPAD_UP){
return super.onKeyUp(keyCode, event);
}
回答2:
if (event.getKeyCode() == KeyEvent.KEYCODE_DPAD_LEFT
&& (event.getAction() == KeyEvent.ACTION_DOWN)) {
if (mType == 0 && currentPos == (disablePos + 1) && disablePos >= 1) {
((GridView) v).getChildAt(disablePos).setSelected(false);
((GridView) v).getChildAt(disablePos - 1).requestFocus();
((GridView) v).setSelection(disablePos - 1);
return true;
} else {
return false;
}if (event.getKeyCode() == KeyEvent.KEYCODE_DPAD_LEFT
&& (event.getAction() == KeyEvent.ACTION_DOWN)) {
if (mType == 0 && currentPos == (disablePos + 1) && disablePos >= 1) {
((GridView) v).getChildAt(disablePos).setSelected(false);
((GridView) v).getChildAt(disablePos - 1).requestFocus();
((GridView) v).setSelection(disablePos - 1);
return true;
} else {
return false;
}
来源：https://stackoverflow.com/questions/29072810/set-disable-focus-on-a-certain-item-in-gridview