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Ho un listView popolato da un cursore da un caricatore del cursore e che utilizza il provider di contenuti. Voglio ordinare il listView in modo che sia organizzato ad esempio gli elementi più recenti vengono aggiunti nella parte superiore di listView. Il listView si presenta sempre nello stesso ordine e non sono in grado di modificare questo ordine.L'ordinamento non funziona con listView e il caricatore del cursore
Ho provato a utilizzare l'ordinamento e modificarlo e indipendentemente da ciò che è impostato su listView mostra sempre gli articoli nelle stesse posizioni. Utilizzando l'ordinamento simili,
CursorLoader loader = new CursorLoader
(List.this, Database.CONTENT_URI, projection,
null, null, LocationsTable.TIME_STAMP + " ASC");
Ho cercato di ordinare per altre colonne oltre TIME_STAMP ma il risultato è sempre lo stesso. l'ordine degli articoli nell'elenco non cambia mai. anche il passaggio da ASC a DESC non ha alcun effetto.
Come è possibile impostare l'ordine o la posizione degli elementi visualizzati in listView popolati con un cursoreAdattatore?
alcuni altri esempi di codice dalla classe listview
dal metodo onCreate
adapter = new ViewAdapter(this, null, 0);
// sets array adapter to listview
listViewOne.setAdapter(adapter);
getLoaderManager().initLoader(LOADER_ID_ONE, null, this);
tre metodi di callback di LoaderCallbacks<Cursor>
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
String projection[] = new String[]{LocationsTable._ID,
LocationsTable.LATITUDE, LocationsTable.LONGITUDE,
LocationsTable.LAND_ADDRESS, LocationsTable.LAST_NAME,
LocationsTable.FIRST_NAME, LocationsTable.LOCATION_IMAGE,
LocationsTable.TIME_STAMP };
CursorLoader loader = new CursorLoader
(List.this, Database.CONTENT_URI, projection, null, null,
LocationsTable.TIME_STAMP + " ASC");
return loader;
} // onCreateLoader
@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {
adapter.swapCursor(cursor);
} // onLoadFinished
@Override
public void onLoaderReset(Loader<Cursor> arg0) {
adapter.swapCursor(null);
} // onLoaderReset
Questa è la stringa utilizzata per creare la tabella nel database estende ContentProvider
private static final String SQL_QUERY_CREATE = "CREATE TABLE "
+ LocationsTable.TABLE_NAME + " (" + LocationsTable._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + LocationsTable.LATITUDE + " TEXT NOT NULL, "
+ LocationsTable.LONGITUDE + " TEXT NOT NULL, " + LocationsTable.LAND_ADDRESS + " TEXT, " + LocationsTable.LAST_NAME + " TEXT, "
+ LocationsTable.FIRST_NAME + " TEXT, " + LocationsTable.LAST_NAME_ALT + " TEXT, " + LocationsTable.FIRST_NAME_ALT + " TEXT, "
+ LocationsTable.CONTACT_ADDRESS + " TEXT, " + LocationsTable.PHONE_NUMBER + " TEXT, " + LocationsTable.MOBILE_NUMBER + " TEXT, "
+ LocationsTable.EMAIL + " TEXT, " + LocationsTable.LOCATION_IMAGE + " TEXT, " + LocationsTable.TIME_STAMP_IMAGE + " INTEGER, "
+ LocationsTable.TIME_STAMP + " INTEGER " + ");";
L'adattatore cursore classe
public class ViewAdapter extends CursorAdapter {
LayoutInflater inflater;
LatAndLngString latAndLng;
public ViewAdapter(Context context, Cursor cursor, int b) {
super(context, cursor, b);
inflater = LayoutInflater.from(context);
} // ViewAdapter constructor
@Override
public void bindView(View view, final Context context, Cursor cursor) {
TextView textViewOne = (TextView) view.findViewById(R.id.textView1); // address
TextView textViewTwo = (TextView) view.findViewById(R.id.textView2); // last name
TextView textViewThree = (TextView) view.findViewById(R.id.textView3); // first name
final Button buttonOne = (Button) view.findViewById(R.id.button1);
final ImageView imageViewOne = (ImageView) view.findViewById(R.id.imageView1);
final ImageView imageViewTwo = (ImageView) view.findViewById(R.id.imageView2);
textViewOne.setText(cursor.getString(cursor.getColumnIndex(LocationsTable.LAND_ADDRESS)));
textViewTwo.setText(cursor.getString(cursor.getColumnIndex(LocationsTable.LAST_NAME)));
textViewThree.setText(cursor.getString(cursor.getColumnIndex(LocationsTable.FIRST_NAME)));
String latitude = cursor.getString(cursor.getColumnIndex(LocationsTable.LATITUDE));
String longitude = cursor.getString(cursor.getColumnIndex(LocationsTable.LONGITUDE));
String imagePath = cursor.getString(cursor.getColumnIndex(LocationsTable.LOCATION_IMAGE));
long timeStampImage = cursor.getLong(cursor.getColumnIndex(LocationsTable.TIME_STAMP));
if(imagePath != null){
int widthInDP = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 80, getResources().getDisplayMetrics());
int heightInDP = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 50, getResources().getDisplayMetrics());
Bitmap sizedBitmap = ImageUtil.createReducedBitmap(imagePath, widthInDP, heightInDP);
imageViewTwo.setImageBitmap(sizedBitmap);
}
textViewOne.setMaxLines(1);
textViewTwo.setMaxLines(2);
textViewThree.setMaxLines(3);
final LatAndLngString latAndLng = new LatAndLngString(latitude, longitude);
buttonOne.setTag(latAndLng);
imageViewOne.setTag(latAndLng);
imageViewTwo.setTag(latAndLng);
// go to register page to edit fields
buttonOne.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
((Button) view).setAlpha(0.3f);
LatAndLngString latAndLngRow = (LatAndLngString) buttonOne.getTag();
Intent intent = new Intent(List.this, Register.class);
intent.putExtra("latitude", String.valueOf(latAndLngRow.latitude));
intent.putExtra("longitude", String.valueOf(latAndLngRow.longitude));
intent.putExtra("origin", 1);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
List.this.startActivity(intent);
return true;
} else if (event.getAction() == MotionEvent.ACTION_UP) {
((Button) view).setAlpha(1.0f);
return true;
}
return false;
}
});
// go to map page to display map
imageViewOne.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
((ImageView) view).setAlpha(0.3f);
LatAndLngString latAndLngRow = (LatAndLngString) buttonOne.getTag();
Intent intent = new Intent(List.this, Map.class);
intent.putExtra("latitude", String.valueOf(latAndLngRow.latitude));
intent.putExtra("longitude", String.valueOf(latAndLngRow.longitude));
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.putExtra("showMarker", true);
List.this.startActivity(intent);
return true;
} else if (event.getAction() == MotionEvent.ACTION_UP) {
((ImageView) view).setAlpha(1.0f);
return true;
}
return false;
}
});
// set image for button
imageViewTwo.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
((ImageView) view).setAlpha(0.3f);
LatAndLngString latAndLngRow = (LatAndLngString) view.getTag();
Intent intent = new Intent(List.this, ImageSelector.class);
intent.putExtra("latitude", String.valueOf(latAndLngRow.latitude));
intent.putExtra("longitude", String.valueOf(latAndLngRow.longitude));
List.this.startActivity(intent);
return true;
} else if (event.getAction() == MotionEvent.ACTION_UP) {
((ImageView) view).setAlpha(1.0f);
return true;
}
return false;
}
});
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
return inflater.inflate(R.layout.listview_row, parent, false);
}
}
CONTENT PROVIDER DI CLASSE codice completo qui
// application package name
// import statements
public class Database extends ContentProvider {
private static final UriMatcher sUriMatcher;
private static final int LOCATIONS_ALL = 1;
private static final int LOCATIONS_ONE = 2;
public static final String AUTHORITY = "com.xxx.realestatelocator.Locations";
public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/locations");
public static final String DATABASE_NAME = "locations.db";
public static final int DATABASE_VERSION = 1;
public static final String CONTENT_TYPE_NOTES_ALL = "vnd.android.cursor.dir/vnd.realestate.locations";
public static final String CONTENT_TYPE_NOTES_ONE = "vnd.android.cursor.item/vnd.realestate.locations";
static {
sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
sUriMatcher.addURI(AUTHORITY, "locations", LOCATIONS_ALL);
sUriMatcher.addURI(AUTHORITY, "locations/#", LOCATIONS_ONE);
}
// Map table columns
private static final HashMap<String, String> sNotesColumnProjectionMap;
private DatabaseHelper mDbHelper;
static {
sNotesColumnProjectionMap = new HashMap<String, String>();
sNotesColumnProjectionMap.put(LocationsTable._ID, LocationsTable._ID);
sNotesColumnProjectionMap.put(LocationsTable.LATITUDE, LocationsTable.LATITUDE);
sNotesColumnProjectionMap.put(LocationsTable.LONGITUDE, LocationsTable.LONGITUDE);
sNotesColumnProjectionMap.put(LocationsTable.LAND_ADDRESS, LocationsTable.LAND_ADDRESS);
sNotesColumnProjectionMap.put(LocationsTable.LAST_NAME, LocationsTable.LAST_NAME);
sNotesColumnProjectionMap.put(LocationsTable.FIRST_NAME, LocationsTable.FIRST_NAME);
sNotesColumnProjectionMap.put(LocationsTable.LAST_NAME_ALT, LocationsTable.LAST_NAME_ALT);
sNotesColumnProjectionMap.put(LocationsTable.FIRST_NAME_ALT, LocationsTable.FIRST_NAME_ALT);
sNotesColumnProjectionMap.put(LocationsTable.CONTACT_ADDRESS, LocationsTable.CONTACT_ADDRESS);
sNotesColumnProjectionMap.put(LocationsTable.PHONE_NUMBER, LocationsTable.PHONE_NUMBER);
sNotesColumnProjectionMap.put(LocationsTable.MOBILE_NUMBER, LocationsTable.MOBILE_NUMBER);
sNotesColumnProjectionMap.put(LocationsTable.EMAIL, LocationsTable.EMAIL);
sNotesColumnProjectionMap.put(LocationsTable.LOCATION_IMAGE, LocationsTable.LOCATION_IMAGE);
sNotesColumnProjectionMap.put(LocationsTable.TIME_STAMP_IMAGE, LocationsTable.TIME_STAMP_IMAGE);
sNotesColumnProjectionMap.put(LocationsTable.TIME_STAMP, LocationsTable.TIME_STAMP);
}
public class LocationsTable implements BaseColumns {
public static final String TABLE_NAME = "tbl_locations";
public static final String _ID = "_id";
public static final String LATITUDE = "latitude";
public static final String LONGITUDE = "longitude";
public static final String LAND_ADDRESS = "land_address";
public static final String LAST_NAME = "last_name";
public static final String FIRST_NAME = "first_name";
public static final String LAST_NAME_ALT = "last_name_alt";
public static final String FIRST_NAME_ALT = "first_name_alt";
public static final String CONTACT_ADDRESS = "contact_address";
public static final String PHONE_NUMBER = "phone_number";
public static final String MOBILE_NUMBER = "mobile_number";
public static final String EMAIL = "email_address";
public static final String LOCATION_IMAGE = "location_image";
public static final String TIME_STAMP_IMAGE = "time_stamp_image";
public static final String TIME_STAMP = "time_stamp";
} // LocationsTable inner class
private static class DatabaseHelper extends SQLiteOpenHelper {
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
private static final String SQL_QUERY_CREATE = "CREATE TABLE "
+ LocationsTable.TABLE_NAME + " (" + LocationsTable._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + LocationsTable.LATITUDE + " TEXT NOT NULL, "
+ LocationsTable.LONGITUDE + " TEXT NOT NULL, " + LocationsTable.LAND_ADDRESS + " TEXT, " + LocationsTable.LAST_NAME + " TEXT, "
+ LocationsTable.FIRST_NAME + " TEXT, " + LocationsTable.LAST_NAME_ALT + " TEXT, " + LocationsTable.FIRST_NAME_ALT + " TEXT, "
+ LocationsTable.CONTACT_ADDRESS + " TEXT, " + LocationsTable.PHONE_NUMBER + " TEXT, " + LocationsTable.MOBILE_NUMBER + " TEXT, "
+ LocationsTable.EMAIL + " TEXT, " + LocationsTable.LOCATION_IMAGE + " TEXT, " + LocationsTable.TIME_STAMP_IMAGE + " INTEGER, "
+ LocationsTable.TIME_STAMP + " INTEGER " + ");";
private static final String SQL_QUERY_DROP = "DROP TABLE IF EXISTS " + LocationsTable.TABLE_NAME + ";";
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(SQL_QUERY_CREATE);
} // onCreate
@Override
public void onUpgrade(SQLiteDatabase db, int oldVer, int newVer) {
db.execSQL(SQL_QUERY_DROP);
onCreate(db);
} // onUpgrade
} // DatabaseHelper inner class
@Override
public boolean onCreate() {
if(mDbHelper == null) {
mDbHelper = new DatabaseHelper(getContext());
}
return false;
}
@Override
public String getType(Uri arg0) {
return null;
} // getType
// insert one new row, full row
@Override
public Uri insert(Uri uri, ContentValues values) {
if (sUriMatcher.match(uri) != LOCATIONS_ALL) {
throw new IllegalArgumentException(" Unknown URI: " + uri);
}
SQLiteDatabase db = mDbHelper.getWritableDatabase();
long rowId = db.insert(LocationsTable.TABLE_NAME, null, values);
if (rowId > 0) {
Uri notesUri = ContentUris.withAppendedId(CONTENT_URI, rowId);
getContext().getContentResolver().notifyChange(notesUri, null);
return notesUri;
}
throw new IllegalArgumentException("<Illegal>Unknown URI: " + uri);
} // insert
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
SQLiteQueryBuilder builder = new SQLiteQueryBuilder();
switch (sUriMatcher.match(uri)) {
case LOCATIONS_ALL:
builder.setTables(LocationsTable.TABLE_NAME);
builder.setProjectionMap(sNotesColumnProjectionMap);
break;
case LOCATIONS_ONE:
builder.setTables(LocationsTable.TABLE_NAME);
builder.setProjectionMap(sNotesColumnProjectionMap);
builder.appendWhere(LocationsTable._ID + " = " + uri.getLastPathSegment());
break;
default:
throw new IllegalArgumentException("Unknown URI: " + uri);
}
SQLiteDatabase db = mDbHelper.getReadableDatabase();
Cursor queryCursor = builder.query(db, projection, selection, selectionArgs, null, null, null);
queryCursor.setNotificationUri(getContext().getContentResolver(), uri);
return queryCursor;
} // query
@Override
public int update(Uri uri, ContentValues values, String where, String[] whereArgs) {
SQLiteDatabase db = mDbHelper.getWritableDatabase();
int count = 0;
switch (sUriMatcher.match(uri)) {
case LOCATIONS_ALL:
count = db.update(LocationsTable.TABLE_NAME, values, where, whereArgs);
break;
case LOCATIONS_ONE:
String rowId = uri.getLastPathSegment();
count = db.update(LocationsTable.TABLE_NAME, values, LocationsTable._ID
+ " = " + rowId + (!TextUtils.isEmpty(where) ? " AND (" + ")" : ""), whereArgs);
default:
throw new IllegalArgumentException("Unknown URI: " + uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return count;
} // update
// delete
@Override
public int delete(Uri uri, String where, String[] whereArgs) {
SQLiteDatabase db = mDbHelper.getWritableDatabase();
int count = 0;
switch (sUriMatcher.match(uri)) {
case LOCATIONS_ALL:
count = db.delete(LocationsTable.TABLE_NAME, where, whereArgs);
break;
case LOCATIONS_ONE:
String rowId = uri.getPathSegments().get(1);
count = db.delete(LocationsTable.TABLE_NAME, LocationsTable._ID + " = "
+ rowId + (!TextUtils.isEmpty(where) ? " AND (" + where + ")" : ""), whereArgs);
break;
default:
throw new IllegalArgumentException("Unknown URI: " + uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return count;
} // delete
} // Database
Solo nel caso - per ottenere la maggior parte degli elementi recenti usano 'desc' invece di' ASC' –
Inoltre, si prega di fornire il codice del vostro 'ContentProvider' –
Ho appena aggiunto il codice per la classe del provider di contenuti, Database che estende ContentProvider – Kevik