PlaylistFragment.java

package io.hefuyi.listener.ui.fragment;


import android.graphics.Rect;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

import com.afollestad.appthemeengine.ATE;

import java.util.List;

import javax.inject.Inject;

import butterknife.BindView;
import butterknife.ButterKnife;
import io.hefuyi.listener.Constants;
import io.hefuyi.listener.ListenerApp;
import io.hefuyi.listener.R;
import io.hefuyi.listener.RxBus;
import io.hefuyi.listener.event.PlaylistUpdateEvent;
import io.hefuyi.listener.injector.component.ApplicationComponent;
import io.hefuyi.listener.injector.component.DaggerPlaylistComponent;
import io.hefuyi.listener.injector.component.PlaylistComponent;
import io.hefuyi.listener.injector.module.PlaylistModule;
import io.hefuyi.listener.mvp.contract.PlaylistContract;
import io.hefuyi.listener.mvp.model.Playlist;
import io.hefuyi.listener.ui.adapter.PlaylistAdapter;
import io.hefuyi.listener.ui.dialogs.CreatePlaylistDialog;
import io.hefuyi.listener.util.ATEUtil;
import io.hefuyi.listener.util.DensityUtil;
import io.hefuyi.listener.util.PreferencesUtility;
import io.hefuyi.listener.widget.DividerItemDecoration;
import io.hefuyi.listener.widget.fastscroller.FastScrollRecyclerView;
import rx.Subscription;
import rx.android.schedulers.AndroidSchedulers;
import rx.functions.Action1;
import rx.schedulers.Schedulers;


public class PlaylistFragment extends Fragment implements PlaylistContract.View {

    @Inject
    PlaylistContract.Presenter mPresenter;
    @BindView(R.id.recyclerview)
    FastScrollRecyclerView recyclerView;
    @BindView(R.id.view_empty)
    View emptyView;
    @BindView(R.id.toolbar)
    Toolbar toolbar;
    private PlaylistAdapter mAdapter;
    private GridLayoutManager layoutManager;
    private RecyclerView.ItemDecoration itemDecoration;
    private PreferencesUtility mPreferences;
    private boolean isGrid;

    @Override
    public void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        injectDependences();
        mPresenter.attachView(this);

        mPreferences = PreferencesUtility.getInstance(getActivity());
        isGrid = mPreferences.getPlaylistView() == Constants.PLAYLIST_VIEW_GRID;
        mAdapter = new PlaylistAdapter(this, null);
        if (isGrid) {
            layoutManager = new GridLayoutManager(getActivity(), 2);
        } else {
            layoutManager = new GridLayoutManager(getActivity(), 1);
        }
    }

    private void injectDependences() {
        ApplicationComponent applicationComponent = ((ListenerApp) getActivity().getApplication()).getApplicationComponent();
        PlaylistComponent playlistComponent = DaggerPlaylistComponent.builder()
                .applicationComponent(applicationComponent)
                .playlistModule(new PlaylistModule())
                .build();
        playlistComponent.inject(this);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_list_layout, container, false);
        ButterKnife.bind(this, rootView);
        return rootView;
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        ATE.apply(this, ATEUtil.getATEKey(getActivity()));

        if (Build.VERSION.SDK_INT < 21 && view.findViewById(R.id.status_bar) != null) {
            view.findViewById(R.id.status_bar).setVisibility(View.GONE);
            if (Build.VERSION.SDK_INT >= 19) {
                int statusBarHeight = DensityUtil.getStatusBarHeight(getContext());
                view.findViewById(R.id.toolbar).setPadding(0, statusBarHeight, 0, 0);
            }
        }

        ((AppCompatActivity) getActivity()).setSupportActionBar(toolbar);

        final ActionBar ab = ((AppCompatActivity) getActivity()).getSupportActionBar();
        ab.setHomeAsUpIndicator(R.drawable.ic_menu);
        ab.setDisplayHomeAsUpEnabled(true);
        ab.setTitle(R.string.playlists);

        recyclerView.setLayoutManager(layoutManager);
        recyclerView.setAdapter(mAdapter);
        setItemDecoration();
        mPresenter.subscribe();
        subscribePlaylistUpdateEvent();
    }

    @Override
    public void onActivityCreated(final Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        setHasOptionsMenu(true);
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        mPresenter.unsubscribe();
        RxBus.getInstance().unSubscribe(this);
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);
        inflater.inflate(R.menu.menu_playlist, menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.action_new_playlist:
                CreatePlaylistDialog.newInstance().show(getChildFragmentManager(), "CREATE_PLAYLIST");
                return true;
            case R.id.menu_show_as_list:
                if (isGrid) {
                    mPreferences.setPlaylistView(Constants.PLAYLIST_VIEW_LIST);
                    isGrid = false;
                    updateLayoutManager(1);
                }
                return true;
            case R.id.menu_show_as_grid:
                if (!isGrid) {
                    mPreferences.setPlaylistView(Constants.PLAYLIST_VIEW_GRID);
                    isGrid = true;
                    updateLayoutManager(2);
                }
                return true;
        }
        return super.onOptionsItemSelected(item);
    }


    @Override
    public void showPlaylist(List<Playlist> playlists) {
        emptyView.setVisibility(View.GONE);
        mAdapter.setPlaylist(playlists);
    }

    @Override
    public void showEmptyView() {
        emptyView.setVisibility(View.VISIBLE);
        recyclerView.setVisibility(View.GONE);
    }

    private void setItemDecoration() {
        if (isGrid) {
            int spacingInPixels = getActivity().getResources().getDimensionPixelSize(R.dimen.spacing_card_album_grid);
            itemDecoration = new PlaylistFragment.SpacesItemDecoration(spacingInPixels);
        } else {
            itemDecoration = new DividerItemDecoration(getActivity(), DividerItemDecoration.VERTICAL_LIST, false);
        }
        recyclerView.addItemDecoration(itemDecoration);
    }

    private void updateLayoutManager(int column) {
        recyclerView.removeItemDecoration(itemDecoration);
        mAdapter = new PlaylistAdapter(this, null);
        recyclerView.setAdapter(mAdapter);
        layoutManager.setSpanCount(column);
        layoutManager.requestLayout();
        setItemDecoration();
        mPresenter.loadPlaylist();
    }

    private void subscribePlaylistUpdateEvent() {
        Subscription subscription = RxBus.getInstance()
                .toObservable(PlaylistUpdateEvent.class)
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Action1<PlaylistUpdateEvent>() {
                    @Override
                    public void call(PlaylistUpdateEvent event) {
                        mPresenter.loadPlaylist();
                    }
                }, new Action1<Throwable>() {
                    @Override
                    public void call(Throwable throwable) {

                    }
                });
        RxBus.getInstance().addSubscription(this, subscription);
    }

    public class SpacesItemDecoration extends RecyclerView.ItemDecoration {
        private int space;

        public SpacesItemDecoration(int space) {
            this.space = space;
        }

        @Override
        public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
            int position = parent.getChildAdapterPosition(view);
            if (position % 2 == 0) {
                outRect.left = 0;
                outRect.top = space;
                outRect.right = space / 2;
            } else {
                outRect.left = space / 2;
                outRect.top = space;
                outRect.right = 0;
            }
        }
    }
}