simplecursoradapter

问题 Why do CursorAdapter subclasses requires the primary key to be necessarily _id ? Isn't there a method to override, or something like that, to change this behaviour ? I have read this trick many times, and I am aware of that ... I just want to understand better ! Thanks 回答1: Why does CursorAdapter subclasses requires the primary key to be necessarily _id ? It turns around and provides that value in various places, such as the long id value in getView() . Isn't there a method to override, or

问题 I have been stacked at a problem and i can not find the solution. I have a database and i load a listview using SimpleCursorAdapter . I want to change the color of a text depending on the value of a column in database ("incOrExp"). This is my list item: <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_margin="10dp" android:background="#afeeee" > <TextView android:id="@+id

问题 I have been stuck at one point from long time, i.e with the use of SimpleCursorAdapter as it fails while returning the correct value. I have seen similar many post in SO itself, saying that I should add _id column in the cursor database query, rather I should do db.rawQuery(String,String) My code in the onCreate(..) is HospitalData = new Database(this); HospitalData.open(); Cursor c = HospitalData.getAllRows_Patient_Db(); startManagingCursor(c); c.moveToFirst(); //HERE SOME LOOP IS NEEDED FOR

问题 I have a customized SimpleCursorAdapter that gets information from a database. If one value is 1 I color the background of an ImageView, if it's 0 I don't color it. When the ListView is loaded everything is correct but then if I scroll the items in the list are get the image colored wrong. ============Just loaded============ After one scroll up and down==== I know about ListView recycling and that when one item is out of the screen it's resources are released, but I don't get why when they

问题 I'm just starting to dive into some basic Android development and have been experimenting with a ListView and integrating it with a SimpleCursorAdapter . I look through a lot of online code samples, but I also have a book to use as a reference (Professional Android 2 Application Development). In the book they work out an example To-Do list application that stores the list items in a SQLite database with an auto-incrementing, integer, primary key field. A user can create new list items, but

问题 I'm trying to implement TwoWayView in my project by following the sample project provided in that link. I have implemented everything and my code works without any errors but the actual List is not getting inflated. Upon debugging I found out that the adapter is set correctly and the getItemCount method is also returning positive count but the other two overridden methods onCreateViewHolder and onBindViewHolder are not getting called. I have no clue why it is not working. Please see the

问题 I have a custom list that I am loading data in it by a SimpleCursorAdapter ..My list has an imageview that I want to change its image per each row of list..I used viewbilnder..but didnot get anything.. this is myadapter code private void getData() { try { // obtain a list of from DB db = SQLiteDatabase.openDatabase(ClubCP.DbPath,null,SQLiteDatabase.CREATE_IF_NECESSARY); String TABLE_NAME = "cat"; String COLUMN_ID = "_id"; String COLUMN_POET_ID = "poet_id"; String COLUMN_TEXT = "text"; String

问题 I am trying to create a single-choice (e.g., radio button) list of items that are queried from a database. To work with the currently selected row, I need to use the getCheckedItemPosition() and setItemChecked() methods of ListView. I have a ListView that has a SimpleCursorAdapter set on it. When I retrieve the currently selected item, I have its row ID from the database, which I need to use to find the appropriate item and manually set it to be selected via the aforementioned methods. In

问题 I have made the following code to retrive data from SQLite database. public Cursor fetchAllScores() { return database.query(DATABASE_TABLE, new String[] { KEY_ROWID, KEY_PLAYDATE, KEY_NUMVALA, KEY_NUMVALB }, null, null, null, null, null); } Then I call this function in my main.java file using the following cursor = dbHelper.fetchAllScores(); startManagingCursor(cursor); After having cursor I manage to populate myGridView with some data using following code GridView myGV = (GridView

问题 I have a simple database table with 2 columns "_id" and "title". and I'm displaying the data in a spinner, and it works well. but I need to add one more item at the top of the spinner list that is not from the database with id = 0 and title = "not specified"; Spinner list = (Spinner) findViewById(R.id.spinner); Cursor cursor = database.getAll(); // returns cursor with objects String[] columns = new String[] {"title"}; int[] to = new int[] {R.id.title}; list.setAdapter(new SimpleCursorAdapter