CODEWITHSUNDEEP
androidandroid-layoutandroid-fragments
JozeRi
JozeRi

Reputation: 3439

Android - how to get the layout id from a view?

Hello fellow developers!

i'll keep this as simple and short as I can, I have a fragment, and in my onCreateView I am sometimes giving it different layouts depend on my status.

is there any way of knowing on which layout I am?

code below:

my onCreateView:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    View view;

    if (programState) {
        view = inflater.inflate(R.layout.fragment_home_program_on, container, false);
    } else {
        view = inflater.inflate(R.layout.fragment_home, container, false);
    }

    findViews(view);
    setupViews();
    return view;
}

basically, my "findViews" method gets that View, and I was wondering if there's a way to know which layout i am on with a switch statement for example or something like that.. like this :

private void findViews(View mainView) {

    switch(mainView) {
        case R.layout.fragment_home:
            //do work
            break;
        case R.layout.fragment_home_program_on:
            //do work
            break;
    }
}

I am trying to do something like that with no success.. all i get is errors and such, is there a way to do that?

thanks a lot in advance

Upvotes: 0

Views: 12719

Answers (4)

Kirill Karmazin
Kirill Karmazin

Reputation: 6781

If you have various Views and you need to differentiate them - try adding tags to them.

1 - If you are going to have more then one tag type - create keys for them. And use mainView.setTag(TAG_TYPE_ID_1, 10011) (many tags for a view) rather than mainView.setTag(10011) (only one tag for a view). In this case TAG_TYPE_ID_1 may be your constant field. It must be initialized with id of some Resource. For example public static final int TAG_TYPE_ID_1 = R.layout.my_frame_layout; Also consider placing int viewId = (int) mainView.getTag() into try/catch because you can get ClassCastException if you will put there a String for example but will try to get int.

But for this example we assume you don't need lots of tags and you know that you have only int as a tag.

2 - Set tag into the view in onCreateview() method in your fragment:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {    View view;
    if (programState) {
        view = inflater.inflate(R.layout.fragment_home_program_on, container, false);
        view.setTag(1011);
    } else {
        view = inflater.inflate(R.layout.fragment_home, container, false);
        view.setTag(1012);
    }

    findViews(view);
    setupViews();
    return view;
}

3 - Then read the tag value in your view and decide what to do

private void findViews(View mainView) {

if(mainView.getTag() == null)
    return;


switch((int) mainView.getTag()) {
    case 1011:
        //do work
        break;
    case 1012:
        //do work
        break;
}

}

NOTE: don't forget that here switch((int) mainView.getTag()) you can get ClassCastException or NullPointerException if tag will be different type or null

Also int codes like 1011, 1012 etc. is better to store as a constant fields

Upvotes: 0

CommonsWare
CommonsWare

Reputation: 1007658

is there any way of knowing on which layout I am?

Sure. Check programState. You are already doing that to determine which layout to load, so use that to determine which layout you loaded.

I was wondering if there's a way to know which layout i am

Use if (programState), the same way you did in onCreateView().

Beyond that, a widget has no idea what layout resource it came from. So, somewhere, you need to track that information yourself, and you seem to be doing so already in programState.

Upvotes: 2

Krupal Shah
Krupal Shah

Reputation: 9187

Change your method to something like this:

private void findViews(View mainView) {
int viewId = mainView.getId();
    switch(viewId) {
        case R.id.firstViewId:
            //do work
            break;
        case R.id.secondViewId:
            //do work
            break;
    }
}

Upvotes: 0

bendaf
bendaf

Reputation: 3031

try mainView.getId() in switch. I think that's what you need

Upvotes: 0

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