Android Open Source - DroidDoesMusic Library Artist View

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Back to project page DroidDoesMusic.
License

The source code is released under:
Copyright (C) 2011 by Michael Rose, Nick Hansen, Joe Zeimen Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Soft...
If you think the Android project DroidDoesMusic listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.
Java Source Code

package com.uid.DroidDoesMusic.UI;
//from   w ww .  j a  va  2 s  .  co m
import android.app.ListActivity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.res.Resources;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.provider.MediaStore;
import android.provider.MediaStore.Audio;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AlphabetIndexer;
import android.widget.ListView;
import android.widget.SectionIndexer;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;

import com.uid.DroidDoesMusic.R;

public class LibraryArtistView extends ListActivity {
  protected static final String TAG = "DroidDoesMusic";
  
  private Cursor cur;
  private boolean populated = false;
  
  @Override
    public void onCreate(Bundle savedInstanceState) {
        Log.d(TAG, getClass().getSimpleName() + ": onCreate");
        
        super.onCreate(savedInstanceState);
        setContentView(R.layout.library);
        
        getListView().setFastScrollEnabled(true);
        
        // Populate ListView
        populateDataIfReady();
    }
  
  @Override
  public void onResume() {
        Log.d(TAG, getClass().getSimpleName() + ": onResume");
    super.onResume();
    
    IntentFilter iff = new IntentFilter();
    iff.addAction(Intent.ACTION_MEDIA_SCANNER_STARTED);
    iff.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);
    iff.addAction(Intent.ACTION_MEDIA_UNMOUNTED);
    iff.addDataScheme("file");
    registerReceiver(this.externalMediaListener, iff);
    
    populateDataIfReady();
  }
  
  @Override
  public void onPause() {
        Log.d(TAG, getClass().getSimpleName() + ": onPause");
    super.onResume();
    
    unregisterReceiver(this.externalMediaListener);
  }
  
  @Override
  public void onListItemClick(ListView l, View v, int position, long id) {
    Log.d(TAG, getClass().getSimpleName() + ": onListItemClick: (" + id + ")");
    super.onListItemClick(l, v, position, id);
    
    cur.moveToPosition(position);
        
    Intent i = new Intent(Intent.ACTION_PICK);
    i.setDataAndType(Uri.EMPTY, "vnd.android.cursor.dir/ddm.album");
    i.putExtra(LibraryAlbumView.INTENT_ITEM_KEY, cur.getString(cur.getColumnIndex(Audio.Artists.ARTIST)));
    i.putExtra(LibraryAlbumView.INTENT_ITEM_KEY2, cur.getInt(cur.getColumnIndex(Audio.Artists._ID)));
    startActivity(i);
  }
  
  public void getArtists() {
        // Grabs content URI for a unique list of Artists on the SDcard
        Uri extUri = Audio.Artists.EXTERNAL_CONTENT_URI;

        // Columns to grab from the DB, then the expected mappings
        String[] projection = new String[] {Audio.Artists._ID, Audio.Artists.ARTIST, Audio.Artists.NUMBER_OF_ALBUMS};
        String[] displayColumns = new String[] {Audio.Artists.ARTIST, Audio.Artists.NUMBER_OF_ALBUMS};
        int[] display = new int[] { android.R.id.text1, android.R.id.text2 };
        
        String sort = Audio.Media.ARTIST + " ASC";
        
        int layout = android.R.layout.simple_list_item_2;
        
        getData(extUri, projection, null, displayColumns, display, sort, layout);
  }
  
  public void getData(Uri datauri, String[] projection, String filter, String[] displayColumns, int[] display, String sort, int layout) {
    // Flag
    populated = true;

        // Activity-managed cursor to get sorted list of artists
        cur = managedQuery(datauri, projection, filter, null, sort);
        
        // SimpleCursorAdapter maps the cursor columns to simplelistitems
        ArtistListAdapter mAdapter = new ArtistListAdapter(this, layout, cur, displayColumns, display);
        
        // Set adapter of listview to the SimpleCursorAdapter 
        setListAdapter(mAdapter);
  }
  
  public void populateDataIfReady() {
        if (!isSdPresent()) {
          TextView tv = (TextView)findViewById(android.R.id.empty);
          tv.setText(getResources().getString(R.string.no_sd_card));
        } else if (!populated) {
          getArtists();
        }
  }
  
  public static boolean isSdPresent() {
      return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
  }
  
  private BroadcastReceiver externalMediaListener = new BroadcastReceiver() {
    @Override
    public void onReceive(Context content, Intent intent) {
          Log.d(TAG, getClass().getSimpleName() + ": onReceive: " + intent.getData());
          receivedBroadcast(intent);
    }
  };
  
  private void receivedBroadcast(Intent i) {
    Log.d(TAG, getClass().getSimpleName() + ": receivedBroadcast: " + i.getData());
    
    if (i.getAction().equals(Intent.ACTION_UMS_CONNECTED) || i.getAction().equals(Intent.ACTION_MEDIA_SHARED) || i.getAction().equals(Intent.ACTION_MEDIA_UNMOUNTED)) {
      populated = false;
    } else {
      // Try again after 5 seconds using a handler
      Handler h = new Handler();
      h.postDelayed(new Runnable() {
        public void run() {
          populateDataIfReady();
        }
      }, 5000);
    }
  }
  
  private static class ArtistListAdapter extends SimpleCursorAdapter implements SectionIndexer {
    private AlphabetIndexer mIndexer;
    private final Resources mResources;
    
    public ArtistListAdapter(Context context, int layout, Cursor c, String[] from, int[] to) {
      super(context, layout, c, from, to);
      
      // Get resources for use later
      mResources = context.getResources();
      
      try {
        // Fire up an AlphabetIndexer for ListView fastscroll
        mIndexer = new AlphabetIndexer(c, c.getColumnIndexOrThrow(Audio.Artists.ARTIST), mResources.getString(R.string.fastscroll_index));
      } catch (IllegalArgumentException e) {
        e.printStackTrace();
      } catch (NullPointerException e) {
        e.printStackTrace();
      }
    }
    
    @Override
    public View newView(Context context, Cursor cursor, ViewGroup parent) {
      View v = super.newView(context, cursor, parent);
      
      // Container for views
      ViewHolder vh = new ViewHolder();
      
      // Set views into container
      vh.line1 = (TextView)v.findViewById(android.R.id.text1);
      vh.line2 = (TextView)v.findViewById(android.R.id.text2);
      
      // 'tag' the view with the ViewHolder for use by bindView
      v.setTag(vh);
      return v;
    }
    
    @Override
    public void bindView(View view, Context context, Cursor c) {
      ViewHolder vh = (ViewHolder)view.getTag();
      
      // Get artist name, set "unknown" if missing
      String artistName = c.getString(c.getColumnIndex(Audio.Albums.ARTIST));
      if (artistName == null || artistName.equals(MediaStore.UNKNOWN_STRING)) {
        artistName = mResources.getString(R.string.unknown_artist);
      }
      
//      // Get album name, set "unknown" if missing
//      String albumName = c.getString(c.getColumnIndex(Audio.Albums.ALBUM));
//      if (albumName == null || albumName.equals(MediaStore.UNKNOWN_STRING)) {
//        albumName = mResources.getString(R.string.unknown_album);
//      }
      
      // Set view
      vh.line1.setText(artistName);
//      vh.line2.setText(artistName);
    }

    public int getPositionForSection(int section) {
      return mIndexer.getPositionForSection(section);
    }

    public int getSectionForPosition(int position) {
      return 0;
    }

    public Object[] getSections() {
      return mIndexer.getSections();
    }
    
    private static class ViewHolder {
      TextView line1;
      TextView line2;
    }
  }
}
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