Save custom download button state listfragment android

Usually, a fragment contributes a portion of UI to the host activity, which is embedded as a part of the activity's overall view hierarchy.

There are two ways you can add a fragment to the activity layout:. In this case, you can specify layout properties for the fragment as if it were a view. For example, here's the layout file for an activity with two fragments:. When the system creates this activity layout, it instantiates each fragment specified in the layout and calls the onCreateView method for each one, to retrieve each fragment's layout.

Note: Each fragment requires a unique identifier that the system can use to restore the fragment if the activity is restarted and which you can use to capture the fragment to perform transactions, such as remove it. There are three ways to provide an ID for a fragment:. At any time while your activity is running, you can add fragments to your activity layout.

You simply need to specify a ViewGroup in which to place the fragment. To make fragment transactions in your activity such as add, remove, or replace a fragment , you must use APIs from FragmentTransaction.

You can get an instance of FragmentTransaction from your Activity like this:. You can then add a fragment using the add method, specifying the fragment to add and the view in which to insert it.

For example:. The first argument passed to add is the ViewGroup in which the fragment should be placed, specified by resource ID, and the second parameter is the fragment to add. Once you've made your changes with FragmentTransaction , you must call commit for the changes to take effect. The examples above show how to add a fragment to your activity in order to provide a UI.

However, you can also use a fragment to provide a background behavior for the activity without presenting additional UI. To add a fragment without a UI, add the fragment from the activity using add Fragment, String supplying a unique string "tag" for the fragment, rather than a view ID. This adds the fragment, but, because it's not associated with a view in the activity layout, it does not receive a call to onCreateView.

So you don't need to implement that method. Supplying a string tag for the fragment isn't strictly for non-UI fragments—you can also supply string tags to fragments that do have a UI—but if the fragment does not have a UI, then the string tag is the only way to identify it. If you want to get the fragment from the activity later, you need to use findFragmentByTag. For an example activity that uses a fragment as a background worker, without a UI, see the FragmentRetainInstance.

To manage the fragments in your activity, you need to use FragmentManager. To get it, call getFragmentManager from your activity. Some things that you can do with FragmentManager include:. For more information about these methods and others, refer to the FragmentManager class documentation. As demonstrated in the previous section, you can also use FragmentManager to open a FragmentTransaction , which allows you to perform transactions, such as add and remove fragments.

A great feature about using fragments in your activity is the ability to add, remove, replace, and perform other actions with them, in response to user interaction. Each set of changes that you commit to the activity is called a transaction and you can perform one using APIs in FragmentTransaction.

You can also save each transaction to a back stack managed by the activity, allowing the user to navigate backward through the fragment changes similar to navigating backward through activities. You can acquire an instance of FragmentTransaction from the FragmentManager like this:.

Each transaction is a set of changes that you want to perform at the same time. You can set up all the changes you want to perform for a given transaction using methods such as add , remove , and replace.

Then, to apply the transaction to the activity, you must call commit. Before you call commit , however, you might want to call addToBackStack , in order to add the transaction to a back stack of fragment transactions.

This back stack is managed by the activity and allows the user to return to the previous fragment state, by pressing the Back button.

For example, here's how you can replace one fragment with another, and preserve the previous state in the back stack:. In this example, newFragment replaces whatever fragment if any is currently in the layout container identified by the R.

By calling addToBackStack , the replace transaction is saved to the back stack so the user can reverse the transaction and bring back the previous fragment by pressing the Back button.

If you add multiple changes to the transaction such as another add or remove and call addToBackStack , then all changes applied before you call commit are added to the back stack as a single transaction and the Back button will reverse them all together.

The order in which you add changes to a FragmentTransaction doesn't matter, except:. If you do not call addToBackStack when you perform a transaction that removes a fragment, then that fragment is destroyed when the transaction is committed and the user cannot navigate back to it.

Whereas, if you do call addToBackStack when removing a fragment, then the fragment is stopped and will be resumed if the user navigates back. Tip: For each fragment transaction, you can apply a transition animation, by calling setTransition before you commit.

Calling commit does not perform the transaction immediately. Rather, it schedules it to run on the activity's UI thread the "main" thread as soon as the thread is able to do so. If necessary, however, you may call executePendingTransactions from your UI thread to immediately execute transactions submitted by commit.

We arrived at that shorthand Toast function by adding the Anko commons dependency in our build. Colors converts the string array stored in the resources file into a Kotlin Array.

Here we can implement our logic. The row is a TextView in this case. We can change the default item press color by creating a selector drawable inside the drawable folder. Dear Sir, so how to move another activity when someone was press one of data?.

Your email address will not be published. Shoot him queries. Follow Author. Implemented the RetainedFragment to save the List collection on device rotation.

Previously I had not done this and figured "Ah, the adapter is fed a blank List collection on creation. I'll save the state of the List and then when Activity's onCreate is called I can feed the retained List to the Adapter constructor and it'll work.

Paul Eaton's Ownd. Save custom download button state listfragment android. Are you recycling inflated views? Or just creating them and leaving them by there? As being new to Android, don't know so much to answer you.

I think this might answer better: stackoverflow. Add this code to your XML layout file and it will be displayed in the bottom right hand corner. Nicolas Zawada Nicolas Zawada 1 1 gold badge 3 3 silver badges 11 11 bronze badges.

This will not work. After that it inflates each view as LayoutInflater. Because that's in his ItemView class, Spira. He is supposed to put it in his ItemListFragment class. Can you give an example of this? ItemListFragment class dosen't have a xml layout file. Oh my bad, then simply put the xml for the FloatingActionButton in your acitivity layout file and call it in your MainActivity java class. That gives you the endresult you want, right?

No it dosen't. My problem is that ItemView is used by ItemAdapter. So maybe somehow how to place to ItemListFragment the xml.