album art with cursor and base adapter not showing in list or toast
i am trying to display the album art and album details in a listview however neither does it display in toast or in listview
here is the code
mainactivity
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//retrieveAudioFiles();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressLint("NewApi")
public void retrieveAudioFiles(){
SongsList songsList = new SongsList();
//Uri sd = Audio.Media.INTERNAL_CONTENT_URI ;
//Uri sd = Audio.Media.EXTERNAL_CONTENT_URI;
Uri sd = MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI;
String[] cols = {Audio.Media.TITLE,Audio.Media.ARTIST,Audio.Media.ALBUM};
String where = Audio.Media.IS_MUSIC;
Cursor audioCursor = getContentResolver().query(sd,cols,where,null,null);
while (audioCursor.moveToNext()){
int posColTitle = audioCursor.getColumnIndex(Audio.Media.TITLE);
int posColArtist = audioCursor.getColumnIndex(Audio.Media.ARTIST);
int posColAlbum = audioCursor.getColumnIndex(Audio.Media.ALBUM);
String songTitle = audioCursor.getString(posColTitle);
String songArtist = audioCursor.getString(posColArtist);
String songAlbum = audioCursor.getString(posColAlbum);
int posColId = audioCursor.getColumnIndex(Audio.Media._ID);
long songId = audioCursor.getLong(posColId);
Uri songUri = ContentUris.withAppendedId(Audio.Media.EXTERNAL_CONTENT_URI,songId);
String[] dataColumn = {Audio.Media.DATA};
Cursor coverCursor = getContentResolver().query(songUri, dataColumn, null, null, null);
coverCursor.moveToFirst();
int dataIndex = coverCursor.getColumnIndex(Audio.Media.DATA);
String filePath = coverCursor.getString(dataIndex);
coverCursor.close();
MediaMetadataRetriever retriever = new MediaMetadataRetriever();
retriever.setDataSource(filePath);
byte[] coverBytes = retriever.getEmbeddedPicture();
Bitmap songCover;
Toast.makeText(getApplicationContext(),audioCursor.getString(audioCursor
.getColumnIndex(android.provider.MediaStore.Audio.Albums.ALBUM)),
Toast.LENGTH_LONG).show();
if (coverBytes!=null) //se l'array di byte non è vuoto, crea una bitmap
songCover = BitmapFactory.decodeByteArray(coverBytes, 0, coverBytes.length);
else
songCover=null;
songsList.add(new Song(songTitle,songArtist,songAlbum));
}
audioCursor.close();
}
public class SongsAdapter extends BaseAdapter {
private SongsList songsList;
private LayoutInflater songInf;
public SongsAdapter(Context c, SongsList theSongs){
super();
songsList=theSongs;
songInf=LayoutInflater.from(c);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return songsList.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return songsList.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
RowWrapper wrapper;
if (convertView == null)
{
convertView = songInf.inflate(
R.layout.song_row, null);
wrapper = new RowWrapper(convertView);
convertView.setTag(wrapper);
}
else
{
wrapper = (RowWrapper) convertView.getTag();
}
Song song = (Song) getItem(position);
wrapper.populate(song);
return convertView;
}
private class RowWrapper
{
private TextView titleTextView;
private TextView artistTextView;
private TextView albumTextView;
private ImageView coverImageView;
public RowWrapper(View convertView)
{
titleTextView = (TextView) convertView.findViewById(R.id.textTitle);
artistTextView = (TextView) convertView.findViewById(R.id.textArtist);
albumTextView = (TextView) convertView.findViewById(R.id.textAlbum);
coverImageView = (ImageView) convertView.findViewById(R.id.smallCover);
}
public void populate(Song song)
{
titleTextView.setText(song.title);
artistTextView.setText(song.artist);
albumTextView.setText(song.album);
if (song.cover != null)
coverImageView.setImageBitmap(song.cover);
}
}
}
}
then in the song class
public class Song {
public String title="";
public String artist="";
public String album="";
public Bitmap cover=null;
public Song(String t, String ar, String al){
title=t;
artist=ar;
album=al;
//cover=c;
}
public Song(){
}
}
and songList class
public class SongsList extends ArrayList<Song> {
public SongsList(){
super();
}
}
how ever nothing is displayed
here are the xml files
activty_main
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.stackalbumart.MainActivity" >
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true" >
</ListView>
</RelativeLayout>
and song_row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical"
android:onClick="songPicked" >
<ImageView
android:id="@+id/smallCover"
android:layout_width="60dp"
android:layout_height="60dp"
android:contentDescription="coverDescription"
android:src="@drawable/ic_launcher" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/labelTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="labelTitle" />
<TextView
android:id="@+id/textTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="5dp"
android:text="textTitle" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/labelArtist"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="0dp"
android:text="labelArtist" />
<TextView
android:id="@+id/textArtist"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:paddingLeft="5dp"
android:text="textArtist" />
<TextView
android:id="@+id/labelAlbum"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:text="labelAlbum" />
<TextView
android:id="@+id/textAlbum"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="5dp"
android:text="textAlbum" />
</LinearLayout>
</LinearLayout>
the app just opens and there is a blank white screen there is even no error
what really should be done
