Android Open Source - PlayTunes Playlists One Fragment

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The source code is released under:
Copyright (c) 2014, Impeccable Labs, LLC. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions ar...
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Java Source Code

package com.ideabag.playtunes.fragment;
// w  ww  .jav  a  2s. co  m
import com.google.android.gms.analytics.HitBuilders;
import com.google.android.gms.analytics.Tracker;
import com.ideabag.playtunes.PlaylistManager;
import com.ideabag.playtunes.R;
import com.ideabag.playtunes.DragNDrop.DragListener;
import com.ideabag.playtunes.DragNDrop.DragNDropListView;
import com.ideabag.playtunes.DragNDrop.DropListener;
import com.ideabag.playtunes.activity.MainActivity;
import com.ideabag.playtunes.adapter.PlaylistsOneAdapter;
import com.ideabag.playtunes.database.MediaQuery;
import com.ideabag.playtunes.dialog.SongMenuDialogFragment;
import com.ideabag.playtunes.util.IMusicBrowser;
import com.ideabag.playtunes.util.TrackerSingleton;
import com.ideabag.playtunes.util.GAEvent.Categories;
import com.ideabag.playtunes.util.GAEvent.Playlist;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.database.ContentObserver;
import android.database.Cursor;
import android.os.Bundle;
import android.os.Handler;
import android.provider.MediaStore;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
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 android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import android.widget.ToggleButton;

public class PlaylistsOneFragment extends Fragment implements IMusicBrowser, AdapterView.OnItemClickListener {
  
  public static final String TAG = "One Playlist Fragment";
  public static final String STARRED_TAG = "Starred Playlist Fragment";
  
  MainActivity mActivity;
  private Tracker mTracker;
  PlaylistsOneAdapter adapter;
  
  private String PLAYLIST_ID = "";
  
  private MenuItem menuItemEdit, menuItemDoneEditing;
  
  private String mTitle, mSubtitle;
  
  private DragNDropListView mListView;
  
  private boolean isEditing = false;
  
  private boolean isStarred = false;
  
  private static final String KEY_POSTION = "position_y";
  private static final String KEY_OFFSET = "offset_y";
  
  protected int mSavedScrollOffset = 0;
  protected int mSavedScrollListPosition = 0;
  
  
  @Override public void setMediaID( String media_id ) {
    
    PLAYLIST_ID = media_id;
    
  }
  
  @Override public String getMediaID() { return PLAYLIST_ID; }
  
  @Override public void onSaveInstanceState( Bundle outState ) {
    super.onSaveInstanceState( outState );
    outState.putString( getString( R.string.key_state_media_id ), PLAYLIST_ID );
    outState.putBoolean( getString( R.string.key_state_playlist_editing ), isEditing );
    outState.putInt( KEY_POSTION, mSavedScrollListPosition );
    outState.putInt( KEY_OFFSET, mSavedScrollOffset );
    
  }
  
  @Override public void onAttach( Activity activity ) {
      
    super.onAttach( activity );
    
    mActivity = ( MainActivity ) activity;
    mTracker = TrackerSingleton.getDefaultTracker( mActivity );
    
    // Set screen name.
    mTracker.setScreenName( TAG );
        
    mActivity.setActionbarTitle( null );
      mActivity.setActionbarSubtitle( null );
      
      
      
    MediaQuery mGetPlaylistName = new MediaQuery(
        MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI,
        new String[] {
              
              MediaStore.Audio.Playlists.NAME,
            MediaStore.Audio.Playlists._ID
          
        },
        MediaStore.Audio.Playlists._ID + " =?",
        new String[] {
          
            PLAYLIST_ID
            
        },
        null
      );
      
    MediaQuery.executeAsync( getActivity(), mGetPlaylistName, new MediaQuery.OnQueryCompletedListener() {
      
      @Override public void onQueryCompleted(MediaQuery mQuery, Cursor mResult) {
        
        if ( mResult != null && mResult.getCount() > 0 ) {
          
          mResult.moveToFirst();
          
          try {
            
            mActivity.setActionbarTitle( mResult.getString( mResult.getColumnIndexOrThrow( MediaStore.Audio.Playlists.NAME ) ) );
                
          } catch( Exception e ) {
            
            mActivity.setActionbarTitle( null );
            
          }
          
        }
        
        mListView.setSelectionFromTop( mSavedScrollListPosition, mSavedScrollOffset );
        
        if ( mResult != null && !mResult.isClosed() ) {
          
          mResult.close();
          
        }
        
      }
      
    });
      
  }
    
  @SuppressLint("NewApi")
  @Override public void onActivityCreated( Bundle savedInstanceState ) {
    super.onActivityCreated( savedInstanceState );
    
    if ( null != savedInstanceState ) {
      
      PLAYLIST_ID = savedInstanceState.getString( getString( R.string.key_state_media_id ) );
      isEditing = savedInstanceState.getBoolean( getString( R.string.key_state_playlist_editing ) );
      mSavedScrollListPosition = savedInstanceState.getInt( KEY_POSTION );
      mSavedScrollOffset = savedInstanceState.getInt( KEY_OFFSET );
      
    }
    
    setRetainInstance( true );
    setHasOptionsMenu( true );
    
    // Adapter is asyncronous
      adapter = new PlaylistsOneAdapter( mActivity, PLAYLIST_ID, songMenuClickListener, new MediaQuery.OnQueryCompletedListener() {
      
      @Override public void onQueryCompleted( MediaQuery mQuery, Cursor mResult ) {
        
        mActivity.setActionbarSubtitle( mResult.getCount() + " " + ( mResult.getCount() == 1 ? getString( R.string.song_singular) : getString( R.string.songs_plural) ) );
        mListView.setSelectionFromTop( mSavedScrollListPosition, mSavedScrollOffset );
        
        mTracker.send( new HitBuilders.EventBuilder()
          .setCategory( isStarred ? Categories.STARRED_PLAYLIST : Categories.PLAYLIST )
          .setAction( Playlist.ACTION_SHOWLIST )
          .setValue( adapter.getCount() )
          .build());
        
      }
      
    } );
      
      // Configure for editing (or not)
      adapter.setEditing( isEditing );
      mListView.setDraggingEnabled( isEditing );
      
      
      if ( android.os.Build.VERSION.SDK_INT < 11 && android.os.Build.VERSION.SDK_INT > 8) {
        
        mListView.setOverScrollMode( AbsListView.OVER_SCROLL_NEVER );
        
      }
      
      mListView.setDivider( getResources().getDrawable( R.drawable.list_divider ) );
      mListView.setDividerHeight( 1 );
      mListView.setSelector( R.drawable.list_item_background );
      
    
    // Dumb thing to have a bottom divider shown
      mListView.setFooterDividersEnabled( true );
      mListView.addFooterView( new View( getActivity() ), null, true);
    //
      
      
      mListView.setAdapter( adapter );
    
      mListView.setOnItemClickListener( this );
      mListView.setOnItemLongClickListener( mSongMenuLongClickListener );
      
    getActivity().getContentResolver().registerContentObserver(
        MediaStore.Audio.Playlists.Members.getContentUri( "external", Long.parseLong( PLAYLIST_ID ) ), true, mediaStoreChanged );
    getActivity().getContentResolver().registerContentObserver(
        MediaStore.Audio.Playlists.Members.getContentUri( "external", Long.parseLong( new PlaylistManager( getActivity() ).createStarredIfNotExist() ) ), true, mediaStoreChanged );
    
    mListView.setDropListener( mSongDropListener );
    
    mListView.setDragListener( mSongDragListener );
    
    
  }
  
  @Override public View onCreateView( LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState ) {
    
    mListView = new DragNDropListView( getActivity(), null );
    
    return mListView;
    
  }
  
  @Override public void onPause() {
    super.onPause();
    
    saveScrollPosition();
    
  }
  
  @Override public void onResume() {
    super.onResume();
    
    mTracker.send( new HitBuilders.AppViewBuilder().build() );
    
  }
  
  @Override public void onDestroy() {
    super.onDestroy();
    
    setHasOptionsMenu( false );
    getActivity().getContentResolver().unregisterContentObserver( mediaStoreChanged );
    
  }
  
  @Override public void onItemClick( AdapterView<?> adapterView, View v, int position, long id ) {
    
    if ( adapter.isEditing ) {
      
      Toast.makeText( getActivity(), getString( R.string.playlist_cant_play_when_editing ), Toast.LENGTH_SHORT ).show();
      
    } else {
      
      String playlistName = mActivity.getSupportActionBar().getTitle().toString();
      
      mActivity.mBoundService.setPlaylist( adapter.getQuery(), playlistName, PlaylistsOneFragment.class, PLAYLIST_ID );
      
      mActivity.mBoundService.setPlaylistPosition( position );
      
      mActivity.mBoundService.play();
      
    }
    
    mTracker.send( new HitBuilders.EventBuilder()
      .setCategory( isStarred ? Categories.STARRED_PLAYLIST : Categories.PLAYLIST )
      .setAction( Playlist.ACTION_CLICK )
      .setValue( position )
      .build());
    
  }
  
  // if ( adapter.isEditing ) {
  
  protected AdapterView.OnItemLongClickListener mSongMenuLongClickListener = new AdapterView.OnItemLongClickListener() {
    
    @Override public boolean onItemLongClick( AdapterView<?> arg0, View v, int position, long id ) {
      
      if ( adapter.isEditing ) {
        
        Toast.makeText( getActivity(), getString( R.string.playlist_cant_play_when_editing ), Toast.LENGTH_SHORT ).show();
        
      } else {
        
        showSongMenuDialog( "" + id );
        
      }
      
      mTracker.send( new HitBuilders.EventBuilder()
        .setCategory( isStarred ? Categories.STARRED_PLAYLIST : Categories.PLAYLIST )
        .setAction( Playlist.ACTION_LONGCLICK )
        .setValue( position )
        .build());
      
      return true;
      
    }
    
  };
  
  private DropListener mSongDropListener = new DropListener() {

    @Override public void onDrop( int from, int to ) {
      
      mActivity.PlaylistManager.moveTrack( PLAYLIST_ID, from, to );
      
    }
    
  };
  
  private DragListener mSongDragListener = new DragListener() {

    @Override public void onStartDrag( int itemIndex, View itemView ) {
      
      //android.util.Log.i( TAG, "" + itemView.getId() );
      //itemView.requestFocus();
      //itemView.requestFocusFromTouch();
      
      
    }

    @SuppressLint("NewApi")
    @Override public void onDrag( int x, int y, ListView listView ) {
      
      int mListHeight = listView.getHeight();
      
      int mSafeYMin = mListHeight / 3;
      int mSafeYMax = ( 2 * mListHeight ) / 3;
      
      int mAmountToScrollY = 0;
      
      if ( y < mSafeYMin ) {
        
        int mYDiff = Math.abs( y - mSafeYMin );
        // Scrolling up means a negative distance
        mAmountToScrollY = -1 * calculateScrollYDistance( mYDiff, mSafeYMin );
        
        //android.util.Log.i( TAG, "Scroll up: " + mAmountToScrollY );
        
      } else if ( y > mSafeYMax ) {
        
        int mYDiff = y - mSafeYMax;
        
        mAmountToScrollY = calculateScrollYDistance( mYDiff, mSafeYMin );
        //android.util.Log.i( TAG, "");
        //android.util.Log.i( TAG, "Scroll down: " + mAmountToScrollY );
      }
      
      if ( mAmountToScrollY != 0 ) {
        
        if ( android.os.Build.VERSION.SDK_INT >= 19 ) {
          
          listView.scrollListBy( mAmountToScrollY );
          
        } else {
          
          //http://stackoverflow.com/questions/3014089/maintain-save-restore-scroll-position-when-returning-to-a-listview
          int index = listView.getFirstVisiblePosition();
          View v = listView.getChildAt(0);
          int top = (v == null) ? 0 : v.getTop();
          
          listView.setSelectionFromTop(index, ( top - mAmountToScrollY ) );
          
        }
        
      }
      
    }

    @Override public void onStopDrag( View itemView ) {
      
      
      
    }
    
    
  };
  
  @Override public void onCreateOptionsMenu( Menu menu, MenuInflater inflater) {
    
     inflater.inflate( R.menu.menu_playlist_one, menu );
     
     menuItemEdit = menu.findItem( R.id.MenuPlaylistEdit );
     
     menuItemDoneEditing = menu.findItem( R.id.MenuPlaylistDone );
     
     menuItemDoneEditing.setVisible( isEditing );
     
     menuItemEdit.setVisible( !isEditing );
     
  }
  
  @Override public void onPrepareOptionsMenu( Menu menu ) {
    
    super.onPrepareOptionsMenu( menu );
    
    if ( !mActivity.mShouldHideActionItems ) {
      
      menuItemDoneEditing.setVisible( isEditing );
      
      menuItemEdit.setVisible( !isEditing );
        
    }
      
  }
  
  
  @Override public boolean onOptionsItemSelected( MenuItem item ) {
    
     switch ( item.getItemId() ) {
     
        case R.id.MenuPlaylistEdit:
           
          isEditing = true;
          
          menuItemDoneEditing.setVisible( isEditing );
          menuItemEdit.setVisible( !isEditing );
          
          adapter.setEditing( isEditing );
          mListView.setDraggingEnabled( isEditing );
          
          mTitle = (String) mActivity.getSupportActionBar().getTitle();
          mSubtitle = (String) mActivity.getSupportActionBar().getSubtitle();
          mActivity.setActionbarSubtitle( mTitle );
          mActivity.setActionbarTitle( getActivity().getString( R.string.playlist_editing ) );
          
           return true;
           
        case R.id.MenuPlaylistDone:
          
          isEditing = false;
          
          menuItemDoneEditing.setVisible( isEditing );
          menuItemEdit.setVisible( !isEditing );
          adapter.setEditing( isEditing );
          mListView.setDraggingEnabled( isEditing );
          
          mActivity.setActionbarTitle( mTitle );
          mActivity.setActionbarSubtitle( mSubtitle );
          
          
          return true;
          
        default:
           return super.onOptionsItemSelected(item);
           
     }
     
  }
  
  View.OnClickListener songMenuClickListener = new View.OnClickListener() {
    
    @Override public void onClick( View v ) {
      
      int viewID = v.getId();
      String songID = "" + v.getTag( R.id.tag_song_id );
      
      if ( viewID == R.id.StarButton ) {
        
        ToggleButton starButton = ( ToggleButton ) v;
        
        if ( starButton.isChecked() ) {
          
          mActivity.PlaylistManager.addFavorite( songID );
          //android.util.Log.i( "starred", songID );
          
        } else {
          
          mActivity.PlaylistManager.removeFavorite( songID );
          //android.util.Log.i( "unstarred", songID );
          
        }
        
      } else if ( viewID == R.id.MenuButton ) {
        
        showSongMenuDialog( songID );
        
      } else if ( viewID == R.id.RemoveButton ) {
        
        mActivity.PlaylistManager.removeSong( PLAYLIST_ID, songID );
        
        Toast.makeText(getActivity(), getString( R.string.playlist_removed ), Toast.LENGTH_SHORT ).show();
        
      }
      
    }
    
  };
  
  protected void showSongMenuDialog( String songID ) {
    
    FragmentTransaction ft = getActivity().getSupportFragmentManager().beginTransaction();
      
    SongMenuDialogFragment newFragment = new SongMenuDialogFragment();
    newFragment.setMediaID( songID );
      
        newFragment.show( ft, "dialog" );
    
  }
  
  ContentObserver mediaStoreChanged = new ContentObserver( new Handler() ) {
    
        @Override public void onChange( boolean selfChange ) {
            
            mActivity.runOnUiThread( new Runnable() {

        @Override public void run() {
          
          saveScrollPosition();
          adapter.requery();
          adapter.notifyDataSetChanged();
          
        }
              
            });
            
            super.onChange( selfChange );
            
        }

  };
  
  
  // 
  // The list is intended to scroll faster the closer the dragged item gets to the edge.
  // 
  // The amount you scroll is calculated with f(x) = e^(b * x)
  // Where b is the percentage inside of the scrolling zone you are times 5
  // 
  // 
  private int calculateScrollYDistance( int diff, int listHeight ) {
    
    //double mCoefficient = 0.00003 * listHeight;
    double mCoefficient = (double) diff / listHeight;
    
    
    
    double scrollAmount = Math.pow( Math.E, ( 5 * mCoefficient ) ) - 1;
    
    //android.util.Log.i( TAG, "Coefficient: " + mCoefficient +" amount to scroll: " + scrollAmount );
    
    return (int) scrollAmount;
    
  }
  
  private void saveScrollPosition() {
    
    try {
      
      if ( null != mListView ) {
        
        mSavedScrollListPosition = mListView.getFirstVisiblePosition();
        
        View v = mListView.getChildAt( 0 );
        mSavedScrollOffset = ( v == null ? 0 : v.getTop() );
        
      }
      
    } catch( Exception e ) {
      e.printStackTrace();
    }
    
  }
  
}
Java Source Code List
