CODEWITHSUNDEEP
javaandroidandroid-fragmentsarraylist
user3585510
user3585510

Reputation: 151

Passing ArrayList to Fragments

I have MainActivity that has two fragment (Tab1 and Tab2). I have fetched data from URL through XML parsing 2 times and store in 2 different ArrayList in MainActivity.

These two fragment has list views. Now i have to pass 1 Arraylist to one fragment and pass 2nd ArrayList to second fragment and then show these ArrayList into ListViews of these two fragments.

How i pass 2 Arraylists to these two fragment and how to show them in these 2 fragments.

This is onCreate method of MinActivity

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    loadPage();
    // Creating The Toolbar and setting it as the Toolbar for the activity

    toolbar = (Toolbar) findViewById(R.id.tool_bar);
    setSupportActionBar(toolbar);


    // Creating The ViewPagerAdapter and Passing Fragment Manager, Titles fot the Tabs and Number Of Tabs.
    adapter =  new ViewPagerAdapter(getSupportFragmentManager(),Titles,Numboftabs);

    // Assigning ViewPager View and setting the adapter
    pager = (ViewPager) findViewById(R.id.pager);
    pager.setAdapter(adapter);

    // Assiging the Sliding Tab Layout View
    tabs = (SlidingTabLayout) findViewById(R.id.tabs);
    tabs.setDistributeEvenly(true); // To make the Tabs Fixed set this true, This makes the tabs Space Evenly in Available width

    // Setting Custom Color for the Scroll bar indicator of the Tab View
    tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
        @Override
        public int getIndicatorColor(int position) {
            return getResources().getColor(R.color.tabsScrollColor);
        }
    });

    // Setting the ViewPager For the SlidingTabsLayout
    tabs.setViewPager(pager);

}

I have two ArrayList in another function(OnPostExecute) where i received data thorugh XML parsing.

I haven't edit anything in Two fragments. I just create these two fragment with List View up till now

Upvotes: 1

Views: 2673

Answers (1)

Benjamin Dobell
Benjamin Dobell

Reputation: 4072

Fragments have a method called setArguments(Bundle). Bundle has built-in support for various ArrayList. You simply put the ArrayList inside the Bundle using a key of your choosing.

However, I do suggest that you follow the newInstance(<parameters>) pattern whereby your Fragment has a static newInstance() method which takes any arguments the Fragment requires to function, in this case an ArrayList of some sort.

Quoting an example from the official Fragment documentation:

public static DetailsFragment newInstance(int index) {
    DetailsFragment f = new DetailsFragment();

    // Supply index input as an argument.
    Bundle args = new Bundle();
    args.putInt("index", index);
    f.setArguments(args);

    return f;
}

This Bundle can be retrieved later (at any time), but is typically done in onCreate() or similar. The "index" stored above could be retrieved as follows:

@Override public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    Bundle args = getArguments();
    if (args != null) {
        mIndex = args.getInt("index");
    }
}

In the example above the parameter is an int, but the same logic can be followed with an ArrayList.

Upvotes: 3

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