I have a form screen that is also an information screen, but in different states. When the user enters to create I want to hide the MenuItem that assigns to delete.
How to do this without breaking the app?
I'm trying to call it like this:
val menu = findViewById<MenuItem>(R.id.deleteBarra)
Here's the docs about it, but you basically want to do your menu setup in onPrepareOptionsMenu instead of onCreateOptionsMenu. onPrepareOptionsMenu gets called every time the menu needs to be displayed (instead of once, during setup).
So you can set a boolean or whatever to say whether the item should be shown, and call invalidateOptionsMenu() to redisplay it. In prepareOptionsMenu() you have access to the menu itself, so you can check that boolean and set the visibility on the appropriate item
Under what condition you want it to be hidden, you can add it under that condition.
menu.visibility = View.INVISIBLE
or
menu.visibility = View.GONE
Related
I have a list. I shoot data using firebase database. I have a favorite button image on my list. When I click the button, favorites are added to the favorite page. When I click the button, the favorite button image changes. But when I scroll up or down on the page or switch to another page, this changed image returns to its original state. What can I do.
The state of the button is not preserved when moving through activities, because the activity object is re-instantiated each time, so in order to fix it, you just make it a static variable.
private static boolean isCandyPressed = false;
Then in your onclick() of button, set it to true. And thus, handle your logic throughout by cheking this variable.
Hope this solves your problem
I have a button in an activity, on clicking that button, I direct the user to a search activity with a search view in the toolbar..
I'm using android.support.v7.widget.SearchView, I managed to expand it automatically using searchView.setIconifiedByDefault(false) in onCreateOptionsMenu..
I also open the keypad automatically in activity onCreate, yet I still have to click in the searchView to start typing there, I want the cursor to be set there automatically..
any help?
call setIconifiedByDefault(false) when the searchview is intialized.
Sets the default or resting state of the search field. If true, a single search icon is shown by default and expands to show the text field and other buttons when pressed. Also, if the default state is iconified, then it collapses to that state when the close button is pressed. Changes to this property will take effect immediately.
Try the below, it worked for me once.
searchView.setIconifiedByDefault(true);
searchView.setFocusable(true);
searchView.setIconified(false);
searchView.requestFocusFromTouch();
Update: If you are Using android.support.v7.widget.SearchView the behaviour is very different. clearFocus is needed if you don’t want the keyboard pop-up all the time.
Also in the searchview layout, use <requestFocus /> tag.
Possible way of hiding menuItem base on the screen(Activity) is in the foreground. I have four (4) menuItem and I want to show two (2) in the action bar and force 2 into the overflow menu, in some screen I want to show three (3) and have one (1) in the overflow menu,and in some screen the page tile is long I do not want it truncated but instead I want to show only one (1) menuItem in the action bar and force the other three (3) into the overflow menu.
I need a generic way to do this.
I need to do this programmatically I don't need the xml answer of IfRoom, I have a BaseActivity which extends ActionBar and I have BaseActivityHelper where I have my menu layout inflated, all my other activity extends the BaseActivity.
I would love to share my code but I'm not allowed to do so, the big question is if you are the one faced with this situation how will you do it.
The docs say:
If you want to modify the options menu based on events that occur during the activity lifecycle, you can do so in the onPrepareOptionsMenu() method. This method passes you the Menu object as it currently exists so you can modify it, such as add, remove, or disable items. (Fragments also provide an onPrepareOptionsMenu() callback.)
So, you can grab your menu item in onPrepareOptionsMenu and call it's setShowAsAction(int actionEnum) with the appropriate option (SHOW_AS_ACTION_ALWAYS, SHOW_AS_ACTION_IF_ROOM, or SHOW_AS_ACTION_NEVER)
Am designing an application in java using netbeans, in which i need to call a "Save" function by clicking on the save item on the menu bar. Am able to call the function by having a button inside the main panel, but am not able to call the function when i click on the menu bar or any where else. How can this be done?
Start with How to Use Menus, then see this example of How to Use Actions.
First check if you have defined an actionPerformed() method for the menuitem from which you are trying to call the method. If not, then you can define an actionPerformed() method by right clicking on the menu item in the design frame and select "events>actionperformed" from the context menu. Also take care that the menu items objects should not be a static field.
Basically I have a ListPreference to allow a user to change the X position of some text on my Live Wallpaper.
It contains 4 entries: top, middle, bottom and manually input X. The first 3 options are no problem, I simply get the SharedPreferences in my WallpaperService class and check if they are top, middle or bottom and change the position corresponding to their choice.
However, the last option is proving more difficult, what I want to do is have an EditText alert box popup when the user clicks the "Manually input X" ListPreference item so they can enter a value for X. I just cant figure out how to make the alert popup from clicking that specific List element.
You probably want to create a custom ListPreference. Basically you want to extend from ListPreference (see original here), and provide a custom protected void onPrepareDialogBuilder(Builder builder), in which you provide the additional "custom" list item and the onclick to handle the selection of the "custom" entry.
Note that I keep saying "custom" because it would be a best practice to make this class as reusable as possible.
Override onPreferenceTreeClick() in your PreferenceActivity and compare the preference it gives to the one you want to do something for.