mirror of
https://github.com/playmusicexporter/playmusicexporter
synced 2024-05-04 19:46:42 +00:00
175 lines
6 KiB
Java
175 lines
6 KiB
Java
/*
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* Copyright (c) 2015 David Schulte
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package de.arcus.playmusicexporter2;
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import android.app.Activity;
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import android.os.Bundle;
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import android.support.v4.app.ListFragment;
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import android.view.View;
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import android.widget.ArrayAdapter;
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import android.widget.ListView;
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import de.arcus.playmusicexporter2.dummy.DummyContent;
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/**
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* A list fragment representing a list of Tracks. This fragment
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* also supports tablet devices by allowing list items to be given an
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* 'activated' state upon selection. This helps indicate which item is
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* currently being viewed in a {@link TrackDetailFragment}.
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* <p/>
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* Activities containing this fragment MUST implement the {@link Callbacks}
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* interface.
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*/
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public class TrackListFragment extends ListFragment {
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/**
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* The serialization (saved instance state) Bundle key representing the
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* activated item position. Only used on tablets.
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*/
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private static final String STATE_ACTIVATED_POSITION = "activated_position";
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/**
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* The fragment's current callback object, which is notified of list item
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* clicks.
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*/
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private Callbacks mCallbacks = sDummyCallbacks;
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/**
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* The current activated item position. Only used on tablets.
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*/
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private int mActivatedPosition = ListView.INVALID_POSITION;
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/**
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* A callback interface that all activities containing this fragment must
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* implement. This mechanism allows activities to be notified of item
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* selections.
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*/
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public interface Callbacks {
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/**
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* Callback for when an item has been selected.
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*/
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public void onItemSelected(String id);
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}
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/**
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* A dummy implementation of the {@link Callbacks} interface that does
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* nothing. Used only when this fragment is not attached to an activity.
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*/
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private static Callbacks sDummyCallbacks = new Callbacks() {
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@Override
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public void onItemSelected(String id) {
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}
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};
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/**
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* Mandatory empty constructor for the fragment manager to instantiate the
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* fragment (e.g. upon screen orientation changes).
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*/
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public TrackListFragment() {
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}
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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// TODO: replace with a real list adapter.
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setListAdapter(new ArrayAdapter<>(
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getActivity(),
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android.R.layout.simple_list_item_activated_1,
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android.R.id.text1,
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DummyContent.ITEMS));
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}
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@Override
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public void onViewCreated(View view, Bundle savedInstanceState) {
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super.onViewCreated(view, savedInstanceState);
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// Restore the previously serialized activated item position.
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if (savedInstanceState != null
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&& savedInstanceState.containsKey(STATE_ACTIVATED_POSITION)) {
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setActivatedPosition(savedInstanceState.getInt(STATE_ACTIVATED_POSITION));
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}
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}
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@Override
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public void onAttach(Activity activity) {
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super.onAttach(activity);
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// Activities containing this fragment must implement its callbacks.
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if (!(activity instanceof Callbacks)) {
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throw new IllegalStateException("Activity must implement fragment's callbacks.");
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}
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mCallbacks = (Callbacks) activity;
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}
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@Override
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public void onDetach() {
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super.onDetach();
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// Reset the active callbacks interface to the dummy implementation.
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mCallbacks = sDummyCallbacks;
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}
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@Override
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public void onListItemClick(ListView listView, View view, int position, long id) {
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super.onListItemClick(listView, view, position, id);
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// Notify the active callbacks interface (the activity, if the
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// fragment is attached to one) that an item has been selected.
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mCallbacks.onItemSelected(DummyContent.ITEMS.get(position).id);
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}
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@Override
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public void onSaveInstanceState(Bundle outState) {
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super.onSaveInstanceState(outState);
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if (mActivatedPosition != ListView.INVALID_POSITION) {
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// Serialize and persist the activated item position.
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outState.putInt(STATE_ACTIVATED_POSITION, mActivatedPosition);
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}
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}
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/**
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* Turns on activate-on-click mode. When this mode is on, list items will be
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* given the 'activated' state when touched.
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*/
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public void setActivateOnItemClick(boolean activateOnItemClick) {
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// When setting CHOICE_MODE_SINGLE, ListView will automatically
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// give items the 'activated' state when touched.
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getListView().setChoiceMode(activateOnItemClick
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? ListView.CHOICE_MODE_SINGLE
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: ListView.CHOICE_MODE_NONE);
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}
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private void setActivatedPosition(int position) {
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if (position == ListView.INVALID_POSITION) {
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getListView().setItemChecked(mActivatedPosition, false);
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} else {
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getListView().setItemChecked(position, true);
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}
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mActivatedPosition = position;
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}
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}
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