Android Open Source - Lollipop-AppCompat-Widgets-Skeleton Callback Fragment

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Back to project page Lollipop-AppCompat-Widgets-Skeleton.

License

The source code is released under:

Apache License

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Java Source Code

package com.sachinshinde.lollipopappcompatskeleton.ui.widgets;
/*from w ww  .ja  v a 2s  . c o m*/
import android.app.Activity;
import android.support.v4.app.Fragment;

public class CallbackFragment extends Fragment {

    /**
     * The fragment's current callback object, which is notified of list item
     * clicks.
     */
    private Callbacks mCallbacks = sDummyCallbacks;

    /**
     * A callback interface that all activities containing this fragment must
     * implement. This mechanism allows activities to be notified of item
     * selections.
     */
    public interface Callbacks {
        /**
         * Callback for when an item has been selected.
         */
        public void onItemSelected(long l);

        /**
         *
         */
        public int getSelectedFragment();
    }

    /**
     * A dummy implementation of the {@link Callbacks} interface that does
     * nothing. Used only when this fragment is not attached to an activity.
     */
    private static Callbacks sDummyCallbacks = new Callbacks() {
        @Override
        public void onItemSelected(long id) {
        }

        @Override
        public int getSelectedFragment(){
            return 0;
        }
    };

    /**
     * Mandatory empty constructor for the fragment manager to instantiate the
     * fragment (e.g. upon screen orientation changes).
     */
    public CallbackFragment() {
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);

        // Activities containing this fragment must implement its callbacks.
        if (!(activity instanceof Callbacks)) {
            throw new IllegalStateException(
                    "Activity must implement fragment's callbacks.");
        }

        mCallbacks = (Callbacks) activity;
    }

    @Override
    public void onDetach() {
        super.onDetach();

        // Reset the active callbacks interface to the dummy implementation.
        mCallbacks = sDummyCallbacks;
    }

}

Java Source Code List