I have some idea for my app. But I don't know how to do.
Basic, we create activity then load it, or call some another Activity from buttom...
My idea is:
We have a ListView, can add, remove item. So everytime we add a item, we add a Activity,too.
How many items in listview so activity is many,too.
Ho to do that?
Sorry you can not create Activity dynamically but you can assign already exist activity to number of items in listview.
You can also make your activity to behave differently according to different values but all is depends on your requirement and your logical implementation.
Make sure that all your Activity is listed in Manifest. Do remember.
Check this & this links mentioning the same.
Related
I'm using Recyclerview to show a list. I want to delete some items like IOS. In my listview template I have added a button to delete item which is invisible by default. In my activity I have another button attached at bottom (Not part of listview) and on tap of this button I want to make all delete buttons of listview visible.
My Question is how can I get reference to all delete buttons of listview in activity and is it the right way to do this?
Thanks
Assuming you have ViewHolders set up, you already have references to all the buttons in your list. All you have to do is to make them visible for every item in the list with a simple loop.
In case you haven't implemented ViewHolders I suggest you check out the documentation and take a look at some simple tutorials on how to use them.
On a side note. If I understood correctly you're making a bottom tab for your app and since you referenced iOS I gotta say this; Remember that Android and iOS are two unique operating systems with their own ways of handling things. Check out Googles pure Android documentation.
In your question title you say RecyclerView, but in your text you say ListView. The solution is similar either way, but it's best to be perfectly clear what you're doing.
In either case, there are at least two different solutions.
First, you could use a boolean flag to determine if all the the item buttons should be showing or not. You check this flag at the time the item view is inflated or created and toggle the button accordingly. If the boolean flag is ever changed, the easiest thing to do is tell the RecyclerView/ListView that the underlying data has changed and to redraw all the views. Call notifyDatasetChanged on the adapter.
The other thing you can do at the time the item buttons should change is iterate all the visible item views, find the button, and change its visibility. With RecyclerView, you can do this, and with ListView you can do this.
I was thinking about using spinners (as it is like a dropdown feature) to change the type of text on my activity. For example let us say we choose the car from the spinner, it would change/replace the layout completely and show the car attributes e.g. car make. Another example is if the user click "Mobile" the spinners will change the layout on the activity.
Is this a good approach to take? Or is it best to create a activity for each product? The only reason I asked this as one of the answers here recommended its not a good idea.
You are the only one that can decide whether to do that or not which mainly depends on the amount of changes that you will make to your layout events handling, and about spinner it has nothing to do with this manner, you will have to do an action after choosing an item from the spinner either creating a new intent() and launching an activity or changing the layout.
So, if you have minor changes in your "layout events handling", you have two options:
if the layout changes mainly in sources, backgrounds, and
visibility of the layout-elements but the structure remains as it is, your best choice is to just make your changes to the views(elements)
itself without changing the whole layout.
if the layout structure has to be changed, you are advised to change
the whole layout by using the method:
setContentView(R.layout.new_layout);
and after that you have to
declare the layout elements again.
BUT, if you have a complete new layout for every element in the spinner, you have two options:
create an activity for each element of the spinner, and include the spinner in each activity of them.
create a fragment activity, and include the spinner in the main
layout of the activity, and create a fragment for each element in
the spinner, and with each element change, navigate to it's
corresponding fragment.
I've been trying many things with list items and i'm facing some problems. In my previous question, thanks to #nEx.Software i was able to resolve the problem. But I'm still missing some concepts here.
Right now i'm trying to differentiate between an item's click and a checkbox within it. However, I want to do it without extending the array adapter. Is there a way to use both methods: listView.onItemClickListener() AND listView.getCheckedItemPositions(), together!
There should be a way to use an xml file [doesn't matter how complex it gets] along with extending the available Views and this thing should be done.
Putting it simple, open the gmail app, and u'll find all emails listed with checkboxes where u can click on the checkbox to mark it OR the rest of the item to open the email.
Again, I know that it is doable with extending Adapters and adding an Array for the checkboxes, but, is it possible to use the convenient methods: listView.onItemClickListener() AND listView.getCheckedItemPositions()? is CheckedTextView a part of the solution?
One more thing, rather than just answering me [where i become lazy]
Wheather it is possible or not, is there a verry reliable reference for such issues? I would really like to fully understand everything that goes into this matter... if its not possible, i must be able to tell why!
Thank you :)
add custom row into your listview. into your custom row you add one textview and checkbox into linerlayout and get linerlayout click event.
I ran into the situation that I need a way to edit the data of list-view item from another activity. I can handle the click event on each item, then edit it on the fly. However, I still prefer to handle all the editing in a separate activity. My listview item is customized from BaseAdapter.
Here is my main page,
Each item within the ListView, contains two other TextView. When the I hit the menu setting, it will go to another activity where I can edit and update the information:
I'm currently having two solutions in mind. Either retrieving data from the previous activity and update the whole ListView (which I think it's kinda expensive in the case user just edit one item). Or I can just get rid of the ListView and create a bunch TextView in the xml, by doing this I can just reference to each TextView by their id. So my question is, which way is preferred in this case? Any suggestion would be greatly appreciated.
Your ListView is displaying Email, Name, Headline, etc? That should be a fixed XML layout with TextView entries, I think. ListView is for variable numbers of elements. You CAN implement it with a ListView, but I wouldn't.
However, your concern about updating the whole list being overkill, I wouldn't worry about that either. You're talking about 7-10 fields. The amount of time Android needs to run through its lifecycle and display everything will dwarf you updating a few fields.
You can use SharedPreferences for this. You can create a wrapper class through which you can access the preferences.Thats the usual way to go about solving these kind of problems. You can check this for details.
You can have it as a variable in your application class, so that you can access that in a global context.
Use text views instead. List View code has been optimized for large amounts of data only and not recommended for small data.
I have two activities, both of which use a listview. I called one "android:list", but called the second one "#+id/myList". Now, my application crashes on startup with a "must have android:list" error message. How does one get around this?
If your Activity's extend ListActivity, then your ListViews must have an ID of android:list. If they are two separate Activity's then it is OK for both to have a ListView with the same ID - the important thing is not to have two Views with the same ID in the same Layout.
ListActivity looks for a ListView with the ID android.R.id.list to get a reference so it can provide all the API features for the developer. Without that it thinks there's no list and crashes when trying to use it. Just define the list in xml like you do with the other one and it will start working. All the pieces need to fit together like a jigsaw puzzle.
I think your activity must be extended from ListActivity, so you should create a listview with the tag android:name="android:id/list" in the layout xml. Hopes useful to you!