Develop Reference

How to sort music files in cursor in android

I am creting music player app and I got music files from device but it is not in shorted order.
It is displaying like this (Not in sorted order)
Code which displays songs in ListView :
public class songlist extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private ListView lv_songlist;
public Cursor cursor;
private MediaCursorAdapter mediaAdapter = null;
private String currentFile;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.songlist);
lv_songlist = (ListView) findViewById(R.id.songlist);
cursor = getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null, null);
if (null != cursor) {
cursor.moveToFirst();
mediaAdapter = new MediaCursorAdapter(this, R.layout.listitem, cursor);
}
}
private class MediaCursorAdapter extends SimpleCursorAdapter {
public MediaCursorAdapter(Context context, int layout, Cursor c) {
super(context, layout, c,
new String[]{MediaStore.MediaColumns.DISPLAY_NAME, MediaStore.MediaColumns.TITLE, MediaStore.Audio.AudioColumns.DURATION},
new int[]{R.id.displayname, R.id.title, R.id.duration});
}
#Override
public void bindView(View view, Context context, Cursor cursor) {
TextView title = (TextView) view.findViewById(R.id.title);
TextView name = (TextView) view.findViewById(R.id.displayname);
TextView duration = (TextView) view.findViewById(R.id.duration);
name.setText(cursor.getString(
cursor.getColumnIndex(MediaStore.MediaColumns.DISPLAY_NAME)));
title.setText(cursor.getString(
cursor.getColumnIndex(MediaStore.MediaColumns.TITLE)));
long durationInMs = Long.parseLong(cursor.getString(
cursor.getColumnIndex(MediaStore.Audio.AudioColumns.DURATION)));
Duration d = new Duration();
String durationInMin = d.convertDuration(durationInMs);
duration.setText("" + durationInMin);
view.setTag(cursor.getString(cursor.getColumnIndex(MediaStore.MediaColumns.DATA)));
}
#Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
LayoutInflater inflater = LayoutInflater.from(context);
View v = inflater.inflate(R.layout.listitem, parent, false);
bindView(v, context, cursor);
return v;
}
}
}

Create string like this :
private String sortOrder = MediaStore.MediaColumns.DISPLAY_NAME+"";
And pass this string to last argument in contentResolver.query method's last parameter :
cursor = getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null, sortOrder);

Android - CursorAdapter doesn't work

I have a ChatActivity, which loads its data via a CursorLoader. The CursorLoader return a cursor with two registers, but the newView and bindView methods in adapter is never called.
My activity
public class ChatActivity extends BaseActivity implements LoaderManager.LoaderCallbacks<Cursor> {
public static final String EXTRA_AMANTEID = "amanteId";
private EditText messageET;
private ListView messagesContainer;
private Button sendBtn;
private ChatAdapter adapter;
private Long amanteId;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chat);
amanteId = getIntent().getLongExtra(ChatActivity.EXTRA_AMANTEID, 0L);
messagesContainer = (ListView) findViewById(R.id.messagesContainer);
messageET = (EditText) findViewById(R.id.messageEdit);
sendBtn = (Button) findViewById(R.id.chatSendButton);
RelativeLayout container = (RelativeLayout) findViewById(R.id.container);
adapter = new ChatAdapter(this);
getLoaderManager().initLoader(0, null, this);
messagesContainer.setAdapter(adapter);
}
private void scroll() {
messagesContainer.setSelection(messagesContainer.getCount() - 1);
}
#Override
public Loader<Cursor> onCreateLoader(int i, Bundle bundle) {
return new CursorLoader(ChatActivity.this, MensagemProvider.CONTENT_URI_CONVERSA, null, null, new String[]{Long.toString(amanteId), Long.toString(amanteId)}, null);
}
#Override
public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {
adapter.swapCursor(cursor);
}
#Override
public void onLoaderReset(Loader<Cursor> loader) {
adapter.swapCursor(null);
}
}
My adapter
public class ChatAdapter extends CursorAdapter {
private Cursor cursor;
private int dataEnvioColumnIndex;
private int idMensagemColumnIndex;
private int idRemetenteColumnIndex;
private int idDestinatarioColumnIndex;
private int apelidoRemetenteColumnIndex;
private int apelidoDestinatarioColumnIndex;
private int textoMensagemColumnIndex;
private long idColaboradorLogado;
public ChatAdapter(Context context) {
super(context, null, false);
}
public ChatMessage getItem() {
ChatMessage message = new ChatMessage();
SimpleDateFormat dt = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
Date dataEnvio = new Date(cursor.getLong(dataEnvioColumnIndex));
message.setDate(dt.format(dataEnvio));
message.setId(cursor.getLong(idMensagemColumnIndex));
Long de = cursor.getLong(idRemetenteColumnIndex);
Long logado = BaseApp.getCredentials().getId();
message.setMe(de.equals(logado));
message.setMessage(cursor.getString(textoMensagemColumnIndex));
return message;
}
#Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
LayoutInflater vi = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View retView = vi.inflate(R.layout.list_item_chat_message, null);
return retView;
}
#Override
public void bindView(View view, Context context, Cursor cursor) {
ViewHolder holder = createViewHolder(view);;
view.setTag(holder);
ChatMessage chatMessage = getItem();
boolean myMsg = chatMessage.getIsme() ;//Just a dummy check
holder.txtMessage.setText(chatMessage.getMessage());
holder.txtInfo.setText(chatMessage.getDate());
}
private ViewHolder createViewHolder(View v) {
ViewHolder holder = new ViewHolder();
holder.txtMessage = (TextView) v.findViewById(R.id.txtMessage);
holder.content = (LinearLayout) v.findViewById(R.id.content);
holder.contentWithBG = (LinearLayout) v.findViewById(R.id.contentWithBackground);
holder.txtInfo = (TextView) v.findViewById(R.id.txtInfo);
return holder;
}
private static class ViewHolder {
public TextView txtMessage;
public TextView txtInfo;
public LinearLayout content;
public LinearLayout contentWithBG;
}
#Override
public Cursor swapCursor(Cursor cursor) {
if(cursor!=null) {
cursor.moveToFirst();
idMensagemColumnIndex = cursor.getColumnIndex(MensagemProvider.COLUMN_MENSAGEMID);
idRemetenteColumnIndex = cursor.getColumnIndex(MensagemProvider.COLUMN_DE);
idDestinatarioColumnIndex = cursor.getColumnIndex(MensagemProvider.COLUMN_PARA);
apelidoRemetenteColumnIndex = cursor.getColumnIndex(MensagemProvider.COLUMN_APELIDO_REMETENTE);
apelidoDestinatarioColumnIndex = cursor.getColumnIndex(MensagemProvider.COLUMN_APELIDO_DESTINATARIO);
textoMensagemColumnIndex = cursor.getColumnIndex(MensagemProvider.COLUMN_MENSAGEM);
}
notifyDataSetChanged();
return cursor;
}
}
what I'm doing wrong ? Can anybody help me ?
Thanks!

Overriding swapCursor() is asking for trouble. The cursor won't be positioned where the adapter expects it to be positioned (before first). And you don't call super.swapCursor() so the adapter never really hears about the new cursor.
I bet you're trying to "optimize" by getting the column indexes only once each time a new cursor is swapped.
First just try getting rid of the swapCursor() override and making the getColumnIndex() calls in your getItem() method. If that works and you still really want to have getColumnIndex() called only once per cursor, you could try something like setting all your cursor indexes to -1 when you swap the cursor, then calling getColumnIndex() inside getItem() only when the index is -1.
But don't mess with swapCursor(), especially without calling super.swapCursor() and returning its result.

Updating SQL row with OnItemLongClick doesn't work

Can anybody please have a look at my code and tell me where I am wrong? I don't get errors, unfortunately the row that is long pressed and new value is provided is not being updated unless I specify exact row number. I need to be able to update the row that is clicked. I tried everything and up to today I didn't manage to get any help. I am beginner in Android development.
Here is the code of MyDB:
public class MyDB {
private static final String TABLE_NAME = null;
private static final String KEY_ID = null;
private SQLiteDatabase db;
private final Context context;
private final MyDBhelper dbhelper;
// Initializes MyDBHelper instance
public MyDB(Context c){
context = c;
dbhelper = new MyDBhelper(context, Constants.DATABASE_NAME, null,
Constants.DATABASE_VERSION);
}
// Closes the database connection
public void close()
{
db.close();
}
// Initializes a SQLiteDatabase instance using MyDBhelper
public void open() throws SQLiteException
{
try {
db = dbhelper.getWritableDatabase();
} catch(SQLiteException ex) {
Log.v("Open database exception caught", ex.getMessage());
db = dbhelper.getReadableDatabase();
}
}
// updates a diary entry (existing row)
public boolean updateDiaryEntry(String title, long rowId)
{
ContentValues newValue = new ContentValues();
newValue.put(Constants.TITLE_NAME, title);
db.beginTransaction();
db.setTransactionSuccessful();
db.endTransaction();
return db.update(Constants.TABLE_NAME , newValue , Constants.KEY_ID + "= ?" ,
new String[]{ Double.valueOf(rowId).toString() })>0;
}
// Reads the diary entries from database, saves them in a Cursor class and returns it from the method
public Cursor getdiaries()
{
Cursor c = db.query(Constants.TABLE_NAME, null, null,
null, null, null, null);
return c;
}
}
Here is the code with the dialog, where I should update the row:
class EditListItemDialog extends Dialog implements View.OnClickListener {
MyDB dba;
private View editText;
private DiaryAdapter adapter;
private SQLiteDatabase db;
public EditListItemDialog(Context context) {
super(context);
dba = new MyDB(context);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.edit_text_dialog);//here is your xml with EditText and 'Ok' and 'Cancel' buttons
View btnOk = findViewById(R.id.button_ok);
editText = findViewById(R.id.edit_text);
btnOk.setOnClickListener(this);
dba.open();
}
private List<String> fragment_monday;
private long rowId;
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//Position is the number of the item clicked
//You can use your adapter to modify the item
long rowId = adapter.getItemId(position); //Will return the clicked item
saveItToDB(rowId);
}
public EditListItemDialog(Context context, DiaryAdapter adapter, int position) {
super(context);
this.fragment_monday = new ArrayList<String>();
this.adapter = adapter;
dba = new MyDB(context);
}
#Override
public void onClick(View v) {
fragment_monday.add(((TextView) v).getText().toString());//here is your updated(or not updated) text
// public void notifyDataSetChanged();
dismiss();
try {
saveItToDB(rowId);
} catch (Exception e) {
e.printStackTrace();
}
}
private void saveItToDB(long rowId) {
dba.open();
dba.updateDiaryEntry(((TextView) editText).getText().toString(), rowId);
dba.close();
((TextView) editText).setText("");
}
}
And here is the Diary Adapter:
public class DiaryAdapter extends BaseAdapter {
private LayoutInflater mInflater;
private ArrayList<MyDiary> fragment_monday;
public DiaryAdapter(Context context) {
mInflater = LayoutInflater.from(context);
fragment_monday = new ArrayList<MyDiary>();
getdata();
ListView list = getListView();
list.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
new EditListItemDialog(Monday.this, null, position).show();
return true;
}
});
}
public void getdata(){
Cursor c = dba.getdiaries();
startManagingCursor(c);
if(c.moveToFirst()){
do{
String title =
c.getString(c.getColumnIndex(Constants.TITLE_NAME));
String content =
c.getString(c.getColumnIndex(Constants.CONTENT_NAME));
MyDiary temp = new MyDiary(title,content);
fragment_monday.add(temp);
} while(c.moveToNext());
}
}
#Override
public int getCount() {return fragment_monday.size();}
public MyDiary getItem(int i) {return fragment_monday.get(i);}
public long getItemId(int i) {return i;}
public View getView(int arg0, View arg1, ViewGroup arg2) {
final ViewHolder holder;
View v = arg1;
if ((v == null) || (v.getTag() == null)) {
v = mInflater.inflate(R.layout.diaryrow, null);
holder = new ViewHolder();
holder.mTitle = (TextView)v.findViewById(R.id.name);
v.setTag(holder);
} else {
holder = (ViewHolder) v.getTag();
}
holder.mdiary = getItem(arg0);
holder.mTitle.setText(holder.mdiary.title);
v.setTag(holder);
return v;
}
public class ViewHolder {
MyDiary mdiary;
TextView mTitle;
}
}

i found first problem at your DB class
update this method
public Cursor getdiaries()
{
Cursor c = db.query(Constants.TABLE_NAME, null, null,
null, null, null, null);
return c;
}
To
public Cursor getdiaries()
{
Cursor c = db.query(Constants.TABLE_NAME, new String[]{Constants.TITLE_NAME ,Constants.CONTENT_NAME}, null,
null, null, null, null);
return c;
}

Issue with custom SimpleCursorAdapter

I'm trying to fill a grid view using data from a db cursor using a custom SimpleCursorAdapter.
My cursor has data (I checked), but nothing is shown in the GridView, and the getView() method is not even called.
Anybody can help? Why is getView() not called?
Thanks
Activity
dbAdapter = new DBAdapter(this);
dbAdapter.open();
Cursor c;
c = dbAdapter.fetchPCList();
startManagingCursor(c);
String[] from = new String[] {};
int[] to = new int[] {};
GridView gridview = (GridView) findViewById(R.id.gridview);
gridview.setAdapter(new PCIconAdapter(this, R.layout.pc_icon, c, from, to));
c.close();
dbAdapter.close();
Adapter
public class PCIconAdapter extends SimpleCursorAdapter {
private final Context mContext;
private final int mLayout;
private final Cursor mCursor;
private final int mPCIDIndex;
private final int mClassNameIndex;
private final LayoutInflater mLayoutInflater;
private final class ViewHolder {
public TextView pc_id_view;
public TextView clas_name_view;
}
public PCIconAdapter(Context context, int layout, Cursor c, String[] from, int[] to) {
super(context, layout, c, from, to);
this.mContext = context;
this.mLayout = layout;
this.mCursor = c;
this.mPCIDIndex = mCursor.getColumnIndex(DBAdapter.KEY_PC_LM_ID);
this.mClassNameIndex = mCursor.getColumnIndex(DBAdapter.KEY_PC_CLAS_NAME);
this.mLayoutInflater = LayoutInflater.from(mContext);
}
public View getView(int position, View convertView, ViewGroup parent) {
if (mCursor.moveToPosition(position)) {
ViewHolder viewHolder;
if (convertView == null) {
convertView = mLayoutInflater.inflate(mLayout, null);
viewHolder = new ViewHolder();
viewHolder.pc_id_view = (TextView) convertView.findViewById(R.id.pc_id);
viewHolder.clas_name_view = (TextView) convertView.findViewById(R.id.clas_name);
convertView.setTag(viewHolder);
}
else {
viewHolder = (ViewHolder) convertView.getTag();
}
String pc_id = mCursor.getString(mPCIDIndex);
String clas_name = mCursor.getString(mClassNameIndex);
viewHolder.pc_id_view.setText(pc_id);
viewHolder.clas_name_view.setText(clas_name);
}
return convertView;
}
}

I had the same problem. I was using an ArrayAdapter and then I changed to a SimpleCursorAdapter, but it doesn't show anything on screen.
I removed
c.close();
dbAdapter.close();
and now its working fine.

because CursorAdapter does not have getView method . it have newView method .
so extend SimpleCursorAdapter and overRide newWiev and other methods like
public class ContactListCursorAdapter extends SimpleCursorAdapter implements Filterable {
private Context context;
private int layout;
public ContactListCursorAdapter (Context context, int layout, Cursor c, String[] from, int[] to) {
super(context, layout, c, from, to);
this.context = context;
this.layout = layout;
}
#Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
Cursor c = getCursor();
final LayoutInflater inflater = LayoutInflater.from(context);
View v = inflater.inflate(layout, parent, false);
int nameCol = c.getColumnIndex(People.NAME);
String name = c.getString(nameCol);
/**
* Next set the name of the entry.
*/
TextView name_text = (TextView) v.findViewById(R.id.name_entry);
if (name_text != null) {
name_text.setText(name);
}
return v;
}
#Override
public void bindView(View v, Context context, Cursor c) {
int nameCol = c.getColumnIndex(People.NAME);
String name = c.getString(nameCol);
/**
* Next set the name of the entry.
*/
TextView name_text = (TextView) v.findViewById(R.id.name_entry);
if (name_text != null) {
name_text.setText(name);
}
}
#Override
public Cursor runQueryOnBackgroundThread(CharSequence constraint) {
if (getFilterQueryProvider() != null) { return getFilterQueryProvider().runQuery(constraint); }
StringBuilder buffer = null;
String[] args = null;
if (constraint != null) {
buffer = new StringBuilder();
buffer.append("UPPER(");
buffer.append(People.NAME);
buffer.append(") GLOB ?");
args = new String[] { constraint.toString().toUpperCase() + "*" };
}
return context.getContentResolver().query(People.CONTENT_URI, null,
buffer == null ? null : buffer.toString(), args, People.NAME + " ASC");
}
}

Your column names array and Views array are empty. So column name to views mapping will never occur. That maybe the reason you are not getting callback on getView

If I remove
c.close();
dbAdapter.close();
it works...
So where am I supposed to close this cursor?...

How to pick contact number using autocomplete in android?

I have implemented an autocomplete feature in my application, but it picks up only the name of the contact instead of the number. Whenever i select a field in the autocomplete textbox, the number should be picked from the phone's contact list and placed in the text box...please help me out! :)
public class AutoMultipleContacts extends Activity {
private static final int PICK_CONTACT = 1;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.multipleselect);
Cursor peopleCursor = getContentResolver().query(Contacts.People.CONTENT_URI, PEOPLE_PROJECTION, null, null, Contacts.People.DEFAULT_SORT_ORDER);
ContactListAdapter contactadapter = new ContactListAdapter(this,peopleCursor);
MultiAutoCompleteTextView textView = (MultiAutoCompleteTextView) findViewById(R.id.contacts);
textView.setAdapter(contactadapter);
textView.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());
}
public static class ContactListAdapter extends CursorAdapter implements Filterable {
public ContactListAdapter(Context context, Cursor c) {
super(context, c);
mContent = context.getContentResolver();
}
#Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
final LayoutInflater inflater = LayoutInflater.from(context);
final TextView view = (TextView) inflater.inflate(
android.R.layout.simple_dropdown_item_1line, parent, false);
view.setText(cursor.getString(5));
return view;
}
#Override
public void bindView(View view, Context context, Cursor cursor) {
((TextView) view).setText(cursor.getString(5));
}
#Override
public String convertToString(Cursor cursor) {
return cursor.getString(5);
}
#Override
public Cursor runQueryOnBackgroundThread(CharSequence constraint) {
if (getFilterQueryProvider() != null) {
return getFilterQueryProvider().runQuery(constraint);
}
StringBuilder buffer = null;
String[] args = null;
if (constraint != null) {
buffer = new StringBuilder();
buffer.append("UPPER(");
buffer.append(Contacts.ContactMethods.NAME);
buffer.append(") GLOB ?");
args = new String[] { constraint.toString().toUpperCase() + "*" };
}
return mContent.query(Contacts.People.CONTENT_URI, PEOPLE_PROJECTION,
buffer == null ? null : buffer.toString(), args,
Contacts.People.DEFAULT_SORT_ORDER);
}
private ContentResolver mContent;
}
private static final String[] PEOPLE_PROJECTION = new String[] {
Contacts.People._ID,
Contacts.People.PRIMARY_PHONE_ID,
Contacts.People.TYPE,
Contacts.People.NUMBER,
Contacts.People.LABEL,
Contacts.People.NAME,
};
}

Try changing
#Override
public String convertToString(Cursor cursor) {
return cursor.getString(5);
}
To
#Override
public String convertToString(Cursor cursor) {
return cursor.getString(3);
}

Append PhoneNumber to the buffer instead of Name and return cursor.getString(3) and setText(cursor.getString(3)). Also People is deprecated now. Use ContactsContracts instead.