Android search with Fragments

2019-01-03 20:00发布

Does somebody know of a tutorial or an example of how to implement the standard Android search interface with Fragments? In other words, is it possible to put a standard search with a SearchManager in a Fragment?

12条回答
走好不送
2楼-- · 2019-01-03 20:37

Here is the example to search something using fragments. Hope it helps and this is what you are looking for:

public class LoaderCursor extends Activity {

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

        FragmentManager fm = getFragmentManager();

        // Create the list fragment and add it as our sole content.
        if (fm.findFragmentById(android.R.id.content) == null) {
            CursorLoaderListFragment list = new CursorLoaderListFragment();
            fm.beginTransaction().add(android.R.id.content, list).commit();
        }
    }

    public static class CursorLoaderListFragment extends ListFragment
            implements OnQueryTextListener, LoaderManager.LoaderCallbacks<Cursor> {

        // This is the Adapter being used to display the list's data.
        SimpleCursorAdapter mAdapter;

        // If non-null, this is the current filter the user has provided.
        String mCurFilter;

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

            // Give some text to display if there is no data.  In a real
            // application this would come from a resource.
            setEmptyText("No phone numbers");

            // We have a menu item to show in action bar.
            setHasOptionsMenu(true);

            // Create an empty adapter we will use to display the loaded data.
            mAdapter = new SimpleCursorAdapter(getActivity(),
                    android.R.layout.simple_list_item_2, null,
                    new String[] { Contacts.DISPLAY_NAME, Contacts.CONTACT_STATUS },
                    new int[] { android.R.id.text1, android.R.id.text2 }, 0);
            setListAdapter(mAdapter);

            // Start out with a progress indicator.
            setListShown(false);

            // Prepare the loader.  Either re-connect with an existing one,
            // or start a new one.
            getLoaderManager().initLoader(0, null, this);
        }

        @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
            // Place an action bar item for searching.
            MenuItem item = menu.add("Search");
            item.setIcon(android.R.drawable.ic_menu_search);
            item.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
            SearchView sv = new SearchView(getActivity());
            sv.setOnQueryTextListener(this);
            item.setActionView(sv);
        }

        public boolean onQueryTextChange(String newText) {
            // Called when the action bar search text has changed.  Update
            // the search filter, and restart the loader to do a new query
            // with this filter.
            mCurFilter = !TextUtils.isEmpty(newText) ? newText : null;
            getLoaderManager().restartLoader(0, null, this);
            return true;
        }

        @Override public boolean onQueryTextSubmit(String query) {
            // Don't care about this.
            return true;
        }

        @Override public void onListItemClick(ListView l, View v, int position, long id) {
            // Insert desired behavior here.
            Log.i("FragmentComplexList", "Item clicked: " + id);
        }

        // These are the Contacts rows that we will retrieve.
        static final String[] CONTACTS_SUMMARY_PROJECTION = new String[] {
            Contacts._ID,
            Contacts.DISPLAY_NAME,
            Contacts.CONTACT_STATUS,
            Contacts.CONTACT_PRESENCE,
            Contacts.PHOTO_ID,
            Contacts.LOOKUP_KEY,
        };

        public Loader<Cursor> onCreateLoader(int id, Bundle args) {
            // This is called when a new Loader needs to be created.  This
            // sample only has one Loader, so we don't care about the ID.
            // First, pick the base URI to use depending on whether we are
            // currently filtering.
            Uri baseUri;
            if (mCurFilter != null) {
                baseUri = Uri.withAppendedPath(Contacts.CONTENT_FILTER_URI,
                        Uri.encode(mCurFilter));
            } else {
                baseUri = Contacts.CONTENT_URI;
            }

            // Now create and return a CursorLoader that will take care of
            // creating a Cursor for the data being displayed.
            String select = "((" + Contacts.DISPLAY_NAME + " NOTNULL) AND ("
                    + Contacts.HAS_PHONE_NUMBER + "=1) AND ("
                    + Contacts.DISPLAY_NAME + " != '' ))";
            return new CursorLoader(getActivity(), baseUri,
                    CONTACTS_SUMMARY_PROJECTION, select, null,
                    Contacts.DISPLAY_NAME + " COLLATE LOCALIZED ASC");
        }

        public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
            // Swap the new cursor in.  (The framework will take care of closing the
            // old cursor once we return.)
            mAdapter.swapCursor(data);

            // The list should now be shown.
            if (isResumed()) {
                setListShown(true);
            } else {
                setListShownNoAnimation(true);
            }
        }

        public void onLoaderReset(Loader<Cursor> loader) {
            // This is called when the last Cursor provided to onLoadFinished()
            // above is about to be closed.  We need to make sure we are no
            // longer using it.
            mAdapter.swapCursor(null);
        }
    }
}
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Ridiculous、
3楼-- · 2019-01-03 20:37

Using AppCompat support classes v7. Just adding something to @David 's solution from @Rookie solution to get it work properly in a simple manner, here is my fragment code:

MyFragment:

public class MyFragment extends Fragment implements SearchView.OnQueryTextListener {

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        // What i have added is this
        setHasOptionsMenu(true);
    }

    @Override
    public void onCreateOptionsMenu (Menu menu, MenuInflater inflater) {

        //inflater.inflate(R.menu.main, menu); // removed to not double the menu items
        MenuItem item = menu.findItem(R.id.action_search);
        SearchView sv = new SearchView(((MainActivity) getActivity()).getSupportActionBar().getThemedContext());
        MenuItemCompat.setShowAsAction(item, MenuItemCompat.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW | MenuItemCompat.SHOW_AS_ACTION_IF_ROOM);
        MenuItemCompat.setActionView(item, sv);
        sv.setOnQueryTextListener(this);
        sv.setIconifiedByDefault(false);
        sv.setOnSearchClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Utils.LogDebug("Clicked: ");
            }
        });

        MenuItemCompat.setOnActionExpandListener(item, new MenuItemCompat.OnActionExpandListener() {
            @Override
            public boolean onMenuItemActionCollapse(MenuItem item) {
                // Do something when collapsed
                Utils.LogDebug("Closed: ");
                return true;  // Return true to collapse action view
            }

            @Override
            public boolean onMenuItemActionExpand(MenuItem item) {
                // Do something when expanded
                Utils.LogDebug("Openeed: ");
                return true;  // Return true to expand action view
            }
        });

        super.onCreateOptionsMenu(menu,inflater);
    }

    @Override
    public boolean onQueryTextSubmit(String query) {
        Utils.LogDebug("Submitted: "+query);
        return true;
    }

    @Override
    public boolean onQueryTextChange(String newText) {
        Utils.LogDebug("Changed: "+newText);
        return false;
    }
}

I added the onActivityCreated, cuz without calling setHasOptionsMenu(true); the system will not know that this fragment needs to interact with the menu.

then I removed the line inflater.inflate(R.menu.main, menu); because it doubled the menu items since Activity inflated a menu, then Fragment inflated another menu

Thanks to @David and @Rookie

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Explosion°爆炸
4楼-- · 2019-01-03 20:37

Use the ActionBar and SearchView. You will be able to handle searches without any connection to Activity. Just set an OnQueryTextListener to the SearchView.

MenuItem item = menu.add("Search");
SearchView sv = new SearchView(getActionBar().getThemedContext());
item.setActionView(sv);
item.setIcon(R.drawable.ic_search);
item.setShowAsAction(MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW
        | MenuItem.SHOW_AS_ACTION_IF_ROOM);
sv.setOnQueryTextListener(new OnQueryTextListener() {
    @Override
    public boolean onQueryTextSubmit(String query) {
        //...
        return false;
    }
    @Override
    public boolean onQueryTextChange(String newText) {
        //...
        return false;
    }
});

See this post for more details on custom search.

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萌系小妹纸
5楼-- · 2019-01-03 20:38

It is quite possible to search in a fragment using the standard ActionBar SearchView ActionView API. This will work back to Android 2.1 (API level 7) too using AppCompat support classes v7.

In your fragment:

@Override
public void onCreateOptionsMenu (Menu menu, MenuInflater inflater){
    inflater.inflate(R.menu.search, menu);
    MenuItem item = menu.findItem(R.id.action_search);
    SearchView sv = new SearchView(((YourActivity) getActivity()).getSupportActionBar().getThemedContext());
    MenuItemCompat.setShowAsAction(item, MenuItemCompat.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW | MenuItemCompat.SHOW_AS_ACTION_IF_ROOM);
    MenuItemCompat.setActionView(item, sv);
    sv.setOnQueryTextListener(new OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {
            System.out.println("search query submit");
            return false;
        }

        @Override
        public boolean onQueryTextChange(String newText) {
            System.out.println("tap");
            return false;
        }
    });
}

In your menu XML

<item
    android:id="@+id/action_search"
    android:icon="@drawable/ic_action_search"
    android:title="Search Waste Items"
    android:showAsAction="ifRoom|collapseActionView"
    nz.govt.app:actionViewClass="android.support.v7.widget.SearchView"
    nz.govt.app:showAsAction="ifRoom|collapseActionView" />
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Ridiculous、
6楼-- · 2019-01-03 20:38

yes its possible,

please implements Search view on your Activity ,'onQueryTextChange' in Activity will also listen the search in fragment, you can check the fragment visibility in 'onQueryTextChange' , if it visible you can call your search method for fragment, its working perfect in my code

太酷不给撩
7楼-- · 2019-01-03 20:40

i found a work around :) you can override this method (startActivity(Intent) ) in your BaseActivity and then check if the action is ACTION_SEARCH then do your special job :D

@Override
    public void startActivity(Intent intent) {
        try {
            if (intent.getAction().equals(Intent.ACTION_SEARCH))
                toast("hello");
        } catch (Exception e) {

        }
    }
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