I would like to change the Icon of a menu item after its clicked. (I am talking about the action menu which deploys on the Action key press)
This is what I have so far:
#Override
public void onMenuItemSelected(final int menuItem) {
if (menuItem == MENU_ITEM_START) {
if(!Started){
Started=true;
**Intent intent = new Intent(Control.Intents.CONTROL_MENU_SHOW);
intent.putExtra(Control.Intents.EXTRA_MENU_ITEM_ID,MENU_ITEM_START);
intent.putExtra(Control.Intents.EXTRA_MENU_ITEM_ICON, ExtensionUtils.getUriString(mContext, R.drawable.menu_item_stop));
sendToHostApp(intent);**
mHandler.postDelayed(RunnableObject, 1000);
}
else{
Started=false;
mHandler.removeCallbacks(RunnableObject);
}
}
}
So, I added the bolded code (between ** and **), to start an intent to "change" the icon in the same way I create the menu the first time, however, that wont work.
Maybe wrong intent: CONTROL_MENU_SHOW?? That is the one I found in the Control Class when initializing the menu.
Any help is appreciated, thanks!!
Nope, there's no way to do it directly. The way you are doing it is the only way.
Related
I'm searching for ways to implement a swipe gesture recognizer which only triggers when you swipe from the outer left side of the screen to the right. We need the gesture to open our custom SideMenu. I tried to use a simple UISwipeGestureRecognizer with the SwipeDirection property set to right, but that gets triggered on every swipe from left to right, no matter what the startpoint of the swipe is.
Ideally, we want the animation of it to look and feel like the InteractivePopGestureRecognizer of a UINavigationController. We are already using a NavigationController, which pushed our MainView over our IntroView. Now, we disable the InteractivePopGestureRecognizer, so you aren't able to go back to the IntroView. That's our problem. If it is possible, we don't want to disable the gesture of the NavigationController, but change the action of it. So the swipe from the far left side of the screen to the right would not pop the current viewcontroller, but open our SideMenu.
Is it possible to override the InteractivePopGestureRecognizer to change the action of it? If this isn't possible, do you have another idea on how to create the exact same gesture recognizer? It has to be possible somehow because many apps only open their SideMenu if your startpoint of the gesture is the left (or right) side of the screen. (e.g. Reddit)
Thanks for any help in advance.
You could use Touch Events and UISwipeGestureRecognizer to do that.
The workaround that is override TouchesBegan method to detect the started point whether fit your needs, and if so add UISwipeGestureRecognizer for View.
SwipeGestureRecognizer rightSwipeGesture;
public override void TouchesBegan (NSSet touches, UIEvent evt)
{
base.TouchesBegan (touches, evt);
UITouch touch = touches.AnyObject as UITouch;
if (touch != null)
{
//code here to handle touch
CoreGraphics.CGPoint swipPoint = touch.LocationInView(View);
if(swipPoint.X < 0.5)
{
rightSwipeGesture = new SwipeGestureRecognizer { Direction = SwipeDirection.Right };
rightSwipeGesture.Swiped += OnSwiped;
View.AddGestureRecognizers(rightSwipeGesture);
}
}
}
public override void TouchesEnded (NSSet touches, UIEvent evt)
{
base.TouchesBegan (touches, evt);
if(null != rightSwipeGesture ){
rightSwipeGesture.Swiped -= OnSwiped;
View.RemoveGestureRecognizers(rightSwipeGesture);
}
}
=============================Update=================================
I found a workaround only use one GestureRecognizer will make it works. You could have a look at UIScreenEdgePanGestureRecognizer. Although it's a Pan gesture, however if you not deal with somethind with the added view, it will work as a swip gesture. In addition, UIScreenEdgePanGestureRecognizer only can work when on the screen edge. You could set the Left edge to handle your needs.
For example:
UIScreenEdgePanGestureRecognizer panRightGestureRecognizer = new UIScreenEdgePanGestureRecognizer();
panRightGestureRecognizer.Edges = UIRectEdge.Left;
panRightGestureRecognizer.AddTarget(() => HandleSwap(panRightGestureRecognizer));
View.AddGestureRecognizer(panRightGestureRecognizer);
private void HandleSwip(UIScreenEdgePanGestureRecognizer panRightGestureRecognizer)
{
Point point = (Point)panRightGestureRecognizer.TranslationInView(View);
if (panRightGestureRecognizer.State == UGestureRecognizerState.Began)
{
Console.WriteLine("Show slider view");
}
}
I have a SurfaceView with a LinearLayout which hides or shows if you click on the SurfaceView.
The problem is that the SurfaceView is not refreshed so if the setVisibility(View.VISIBLE) actually doesn't work.
This is the code I'm using:
sv.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v)
{
Log.d("MainActivity-onCreate-onClick-buttons",
buttonsVisibility.toString());
if (buttonsVisibility)
{
linearLayoutButtons.setVisibility(View.INVISIBLE);
buttonsVisibility = false;
} else
{
linearLayoutButtons.setVisibility(View.VISIBLE);
buttonsVisibility = true;
}
}
});
By default buttonVisibility is set to false and the first time I click the view it actually is so so the logic is consistent, the only problem is that the setVisibility seems to have no effect. Only if I turn on/off the screen I can see the layout displayed correctly and then working properly. Why I need to turn the screen off to refresh the UI? Shouldn't it refresh automatically after the setVisibility?
Thank you very much
I don't know why but if I change my Buttons to be ImageButtons it works but buttons appear with a wrong "z-index" wherever I put them. I need to click once on them to fix the "z-index". If I change setVisibility(View.INVISIBLE) with setVisibility(View.GONE) all works fine.
Hope this might be helpful for someone with the same problem.
I recently started creating an app for blackberry. I want the app to display a screen (Let's say it's called "InfoScreen") but as I said i am still very new to this. What code will I have to use if I want the "InfoScreen" to be show when the button "buttonInfo" is clicked?
Here is some code I used to create the button that is might relevant to this question.
//Create button
ButtonField buttonInfo = new ButtonField("Information", Field.FIELD_HCENTER);
//Center buttons
VerticalFieldManager vfm = new VerticalFieldManager(Field.USE_ALL_WIDTH);
vfm.add(buttonInfo);
add(vfm);
What code will have to be used for both touch-screen devices and those that use the track-pad?
Thanks
Try this:
FieldChangeListener infoListener = new FieldChangeListener() {
public void fieldChanged(Field field, int context) {
UiApplication.getUiApplication().pushScreen(new InfoScreen());
}
};
buttonInfo.setChangeListener(infoListener);
I am working on a game where I am extending the view and performing operations in the class. I need to have a popup in the game which will have 3 buttons inside it. I have managed to have the popup show-up using custom dialogs but when I configure the onClick as follows:
private void popUp() {
Context mContext = getContext();
Dialog dialog = new Dialog(mContext);
dialog.setContentView(R.layout.custom_fullimage_dialog);
dialog.setTitle("Cheese Market");
Button one = (Button)findViewById(R.id.firstpack);
one.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
cheeseLeft = cheeseLeft + 10;
masterMoveLock = false;
return;
}
});
}
It force closes giving a nullpointerexeption even though it is defined in the custom_fullimage_dialog layout.
Can someone help me figure out how to have the button click detected in this scenario?
Thank you.
Try calling dialog.findViewById instead.
You're setting the contentView for the dialog, but by calling findViewById you're looking for it under your activity's content view.
I'm trying to add a menu item such that it acts like a check mark where the user can check/uncheck, and the other classes can see that menu item's check mark status. I received a suggestion of creating a class for the menu option (with a popup option), however, I can't create a class for the menu option when I'm in the resource layout editor in Visual Studio 2005. It would be great to hear suggestions on the easiest way to create menu items that can do what I have described.
You should use the CCmdUI::SetCheck function to add a checkbox to a menu item, via an ON_UPDATE_COMMAND_UI handler function, and the ON_COMMAND handler to change the state of the checkbox. This method works for both for your application's main menu and for any popup menus you might create.
Assuming you have an MDI or SDI MFC application, you should first decide where you want to add the handler functions, for example in the application, main frame, document, or view class. This depends on what the flag will be used for: if it controls application-wide behaviour, put it in the application class; if it controls view-specific behaviour, put it in your view class, etc.
(Also, I'd recommend leaving the menu item's Checked property in the resource editor set to False.)
Here's an example using a view class to control the checkbox state of the ID_MY_COMMAND menu item:
// MyView.h
class CMyView : public CView
{
private:
BOOL m_Flag;
afx_msg void OnMyCommand();
afx_msg void OnUpdateMyCommand(CCmdUI* pCmdUI);
DECLARE_MESSAGE_MAP()
};
// MyView.cpp
BEGIN_MESSAGE_MAP(CMyView, CView)
ON_COMMAND(ID_MY_COMMAND, OnMyCommand)
ON_UPDATE_COMMAND_UI(ID_MY_COMMAND, OnUpdateMyCommand)
END_MESSAGE_MAP()
void CMyView::OnMyCommand()
{
m_Flag = !m_Flag; // Toggle the flag
// Use the new flag value.
}
void CMyView::OnUpdateMyCommand(CCmdUI* pCmdUI)
{
pCmdUI->SetCheck(m_Flag);
}
You should ensure the m_Flag member variable is initialised, for example, in the CMyView constructor or OnInitialUpdate function.
I hope this helps!
#ChrisN's approach doesn't quite work for MFC Dialog applications (the pCmdUI->SetCheck(m_Flag); has no effect). Here is a solution for Dialog apps:
// MyView.h
class CMyView : public CView
{
private:
BOOL m_Flag;
CMenu * m_menu;
virtual BOOL OnInitDialog();
afx_msg void OnMyCommand();
DECLARE_MESSAGE_MAP()
};
// MyView.cpp
BEGIN_MESSAGE_MAP(CMyView, CView)
ON_COMMAND(ID_MY_COMMAND, OnMyCommand)
END_MESSAGE_MAP()
BOOL CMyView::OnInitDialog()
{
m_menu = GetMenu();
}
void CMyView::OnMyCommand()
{
m_Flag = !m_Flag; // Toggle the flag
if (m_flag) {
m_menu->CheckMenuItem(ID_MENUITEM, MF_CHECKED | MF_BYCOMMAND);
} else {
m_menu->CheckMenuItem(ID_MENUITEM, MF_UNCHECKED | MF_BYCOMMAND);
}
}
References:
http://www.codeguru.com/forum/showthread.php?t=322261
I ended up retrieving the menu from the mainframe using GetMenu() method, and then used that menu object and ID numbers to call CheckMenuItem() with the right flags, as well as GetMenuState() function.