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/*
* Copyright (C) 2012 Andrew Neal
* Copyright (C) 2014 The CyanogenMod Project
* Licensed under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law
* or agreed to in writing, software distributed under the License is
* distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the specific language
* governing permissions and limitations under the License.
*/
package com.cyanogenmod.eleven.adapters;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.util.SparseArray;
import android.view.ViewGroup;
import com.cyanogenmod.eleven.R;
import com.cyanogenmod.eleven.ui.fragments.AlbumFragment;
import com.cyanogenmod.eleven.ui.fragments.ArtistFragment;
import com.cyanogenmod.eleven.ui.fragments.PlaylistFragment;
import com.cyanogenmod.eleven.ui.fragments.SongFragment;
import com.cyanogenmod.eleven.utils.Lists;
import java.lang.ref.WeakReference;
import java.util.List;
import java.util.Locale;
/**
* A {@link FragmentPagerAdapter} class for swiping between playlists, recent,
* artists, albums, songs, and genre {@link Fragment}s on phones.<br/>
*/
public class PagerAdapter extends FragmentPagerAdapter {
private final SparseArray<WeakReference<Fragment>> mFragmentArray = new SparseArray<WeakReference<Fragment>>();
private final List<Holder> mHolderList = Lists.newArrayList();
private final Context mContext;
private int mCurrentPage;
/**
* Constructor of <code>PagerAdatper<code>
*
* @param fragmentManager The supporting fragment manager
*/
public PagerAdapter(final Context context, final FragmentManager fragmentManager) {
super(fragmentManager);
mContext = context;
}
/**
* Method that adds a new fragment class to the viewer (the fragment is
* internally instantiate)
*
* @param className The full qualified name of fragment class.
* @param params The instantiate params.
*/
@SuppressWarnings("synthetic-access")
public void add(final Class<? extends Fragment> className, final Bundle params) {
final Holder mHolder = new Holder();
mHolder.mClassName = className.getName();
mHolder.mParams = params;
final int mPosition = mHolderList.size();
mHolderList.add(mPosition, mHolder);
notifyDataSetChanged();
}
/**
* Method that returns the {@link Fragment} in the argument
* position.
*
* @param position The position of the fragment to return.
* @return Fragment The {@link Fragment} in the argument position.
*/
public Fragment getFragment(final int position) {
final WeakReference<Fragment> mWeakFragment = mFragmentArray.get(position);
if (mWeakFragment != null && mWeakFragment.get() != null) {
return mWeakFragment.get();
}
return getItem(position);
}
/**
* {@inheritDoc}
*/
@Override
public Object instantiateItem(final ViewGroup container, final int position) {
final Fragment mFragment = (Fragment)super.instantiateItem(container, position);
final WeakReference<Fragment> mWeakFragment = mFragmentArray.get(position);
if (mWeakFragment != null) {
mWeakFragment.clear();
}
mFragmentArray.put(position, new WeakReference<Fragment>(mFragment));
return mFragment;
}
/**
* {@inheritDoc}
*/
@Override
public Fragment getItem(final int position) {
final Holder mCurrentHolder = mHolderList.get(position);
final Fragment mFragment = Fragment.instantiate(mContext,
mCurrentHolder.mClassName, mCurrentHolder.mParams);
return mFragment;
}
/**
* {@inheritDoc}
*/
@Override
public void destroyItem(final ViewGroup container, final int position, final Object object) {
super.destroyItem(container, position, object);
final WeakReference<Fragment> mWeakFragment = mFragmentArray.get(position);
if (mWeakFragment != null) {
mWeakFragment.clear();
}
}
/**
* {@inheritDoc}
*/
@Override
public int getCount() {
return mHolderList.size();
}
/**
* {@inheritDoc}
*/
@Override
public CharSequence getPageTitle(final int position) {
return mContext.getResources().getStringArray(R.array.page_titles)[position]
.toUpperCase(Locale.getDefault());
}
/**
* Method that returns the current page position.
*
* @return int The current page.
*/
public int getCurrentPage() {
return mCurrentPage;
}
/**
* Method that sets the current page position.
*
* @param currentPage The current page.
*/
protected void setCurrentPage(final int currentPage) {
mCurrentPage = currentPage;
}
/**
* An enumeration of all the main fragments supported.
*/
public enum MusicFragments {
/**
* The artist fragment
*/
ARTIST(ArtistFragment.class),
/**
* The album fragment
*/
ALBUM(AlbumFragment.class),
/**
* The song fragment
*/
SONG(SongFragment.class),
/**
* The playlist fragment
*/
PLAYLIST(PlaylistFragment.class);
private Class<? extends Fragment> mFragmentClass;
/**
* Constructor of <code>MusicFragments</code>
*
* @param fragmentClass The fragment class
*/
private MusicFragments(final Class<? extends Fragment> fragmentClass) {
mFragmentClass = fragmentClass;
}
/**
* Method that returns the fragment class.
*
* @return Class<? extends Fragment> The fragment class.
*/
public Class<? extends Fragment> getFragmentClass() {
return mFragmentClass;
}
}
/**
* A private class with information about fragment initialization
*/
private final static class Holder {
String mClassName;
Bundle mParams;
}
}
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