What am I doing wrong here? I have a listview of items (songs on the
sd card). The user has an option to load all the songs on the sd card
to into a current playlist -- those songs are what is displayed in the
listview. Because this can take few seconds to load if they have a lot
of songs on the card, I want to display a progress dialog to just tell
the user "One moment..." until the list refresh is done.
I launch a thread to do this. I've done this successfully on another
app I have (which just updates a database in the background but
doesn't update any display), but this one fails with this error
message, "Can't create handler inside thread that has not called
Looper.prepare()". I chopped down the activity and pasted it below.
What am I doing wrong here? I have just a vague idea of what might be
happening.
By the way, everything works when I take out the threaded stuff, it
just looks like the app freezes for a couple seconds.
Ken
/
************************************************************************************************/
public class ListingThing extends ListActivity implements Runnable {
public static final String PREF_NAME = "PlaylistAlarmPreferences";
static final private int CONFIGURE_PLAYLIST = Menu.FIRST;
static final private int DELETE_LIST = Menu.FIRST+1;
static final private int DELETE_SONG = Menu.FIRST;
static final private int LOAD_ALL = Menu.FIRST+2;
String playlistName, CURRENT_PLAYLIST;
SharedPreferences settings;
String[] items, subitems, fullpath;
int DRILL_DOWN_LEVEL, resultCount;
MediaPlayer mMediaPlayer;
ProgressDialog myProgressDialog;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mMediaPlayer = new MediaPlayer();
getListOfPlaylists();
setListAdapter(new MySpecialAdapter(this));
// you need this for the contextmenu
registerForContextMenu(getListView());
}
public void getListOfPlaylists(){
// query db for list of songs
}
class MySpecialAdapter extends ArrayAdapter {
Activity context;
MySpecialAdapter(Activity context) {
super(context, R.layout.double_list_item, items);
this.context=context;
}
public View getView(int position, View convertView, ViewGroup
parent) {
View row=convertView;
if (row==null) {
LayoutInflater inflater=context.getLayoutInflater();
row=inflater.inflate(R.layout.double_list_item, null);
}
TextView text1 = (TextView)row.findViewById(R.id.maintext);
text1.setText(items[position]);
TextView text2 = (TextView)row.findViewById(R.id.subtext);
text2.setText(subitems[position]);
row.setSoundEffectsEnabled(true);
return row;
}
}
// This handles a context menu item click
@Override
public boolean onContextItemSelected(MenuItem item) {
AdapterContextMenuInfo info = (AdapterContextMenuInfo)
item.getMenuInfo();
Object n = this.getListAdapter().getItemId((int)info.id);
final String pos = n.toString(); // get the item number of
selection
myProgressDialog = ProgressDialog.show(this,
"One moment...", "Refreshing list of songs in
playlist.", true);
CURRENT_PLAYLIST = items[Integer.parseInt(pos)];
Thread t = new Thread(this);
t.start();
return super.onContextItemSelected(item);
}
public void run(){
loadsongs(CURRENT_PLAYLIST);
handler.sendEmptyMessage(0);
}
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg){
myProgressDialog.dismiss();
// refresh the listing of playlists
getListOfPlaylists();
setListAdapter(new MySpecialAdapter(ListingThing.this));
}
};
// delete all songs in playlist and then reload all songs into it
private void loadsongs(String pl){
try{
Uri media = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
DBAdapter db_songs = new DBAdapter(ListingThing.this);
String[] projection = {
// The columns we want
MediaStore.Audio.Media._ID,
// 0
MediaStore.Audio.Media.ARTIST,
// 1 artist
MediaStore.Audio.Media.TITLE,
// 2 song
MediaStore.Audio.Media.DATA,
// 3 full path of file "/sdcard/In
Da Club.mp3"
MediaStore.Audio.Media.DISPLAY_NAME, // 4
"In Da Club.mp3"
MediaStore.Audio.Media.DURATION};
// 5 time in milliseconds
String selection = MediaStore.Audio.Media.IS_MUSIC + "
!= 0";
Cursor c = this.managedQuery(media, projection,
selection, null,
null);
db_songs.open();
db_songs.deletePlaylist(pl); // delete all songs in
playlist first
if (c.moveToFirst()){
do {
db_songs.insertPoint(
pl,
c.getString(1),
c.getString(2),
c.getString(3),
c.getString(4),
c.getString(5),
0);
}while (c.moveToNext());
}
resultCount = c.getCount();
db_songs.close();
c.close();
Toast.makeText(ListingThing.this,
"All songs on the SD card where added
to the playlist
'"+playlistName+"'",
Toast.LENGTH_LONG).show();
}catch(Exception e){
Toast.makeText(ListingThing.this,
"Error loading all songs to playlist.\n: "+e,
Toast.LENGTH_LONG).show();
}
}
}
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