Android :: Open Helper To Open Database And Get A Cursor To Pass To CursorAdapter
Jul 1, 2010
I have a ListActivity that uses a CursorAdapter to fill the rows in the view. I wrote a database helper class that gives me back results for common queries I make for my app, and it uses an SQLiteOpenHelper implementation I wrote to open the database. I use the open helper to open the database and get a cursor to pass to my CursorAdapter.
Here's a code snippet:
CODE:...................
The problem I'm having, that I didn't have before I implemented the open helper (before I just opened the database directly without a helper), is when I click on an item, which takes me to another activity, and then go back to this activity. When it initializes everything is fine, and my list is populated fine, but when I go back from the activity that follows, the list is empty and in the LogCat I see "Invalid statement in fillWindow()".
It appears from a few post I've seen that the reason is, when I requery the cursor, the database is closed. But I'm not closing it! I'm scratching my head on this one.
View 2 Replies
Jul 27, 2009
I am writing an app that has a single database file with 3 tables ( AudioTable, PeopleMap, ImageTable) and am looking at 2 design alternatives:
1. A -single- database adapter (myDBAdapter.java) which uses a database helper class that extends SQLiteOpenHelper. The adapter class has separate methods for accessing and updating rows in each of the 3 tables. ie. insertAudio() insertPeople() insertImage()
2. 3 different database adapters for each table all using the same db file.. 1. audioDBAdapter.java, 2. peopleDBAdapter.java, 3. imageDBAdapter.java) Each adapter uses it's own db helper class (extending SQLiteOpenHelper)
While option 2 offers better encapsulation of the 3 classes (and corresponding data), I'm wondering if there couldbe a performance overhead or does the SQLiteOpenHelper implementation handle this without much overhead ?
Or is there some other way I can get better encapsulation with option 1. something similar to the way the Contacts Provider nicely allows for separate instances of Contacts.People, Contacts.Phones, Contacts.Settings, etc.
View 2 Replies
View Related
Aug 15, 2010
note: there are two versions of VLC Remote, I'm talking about this one: http://www.appbrain.com/app/com.hobbyistsoftware.android.vlcremote_us
Is VLC Setup Helper supposed to be open on the computer to establish a connection with my phone? When I'm playing a file in VLC, and open up the phone's app, it won't connect until I open up "VLC Setup Helper". It just seems a hassle to always remember to open up VLC Setup Helper all the time.
View 6 Replies
View Related
Aug 21, 2010
According to my application i create the database with two tables. when i inserting the data in 1 table then it runs correctly after that when i save data in the second table then it gives the exception of illegal state exception (database cannot be open). Please give me the solution.
View 1 Replies
View Related
Sep 7, 2010
I have a cursor adapter and the logcat is filled with above errors, as soon as I click on a view. I am already releasing the CursorAdapter's cursor in onDestroy().Is there any way to get information about when the cursor was opened?
View 3 Replies
View Related
Apr 18, 2010
I am trying to use
SQLiteDatabase.openDatabase( "/data/data/edwin11.myapp/databases/myapp.db", null, (SQLiteDatabase.CREATE_IF_NECESSARY | SQLiteDatabase.NO_LOCALIZED_COLLATORS));
To create/open a database instead of making use of the SQLiteOpenHelper (because I want to pass in the flag SQLiteDatabase.NO_LOCALIZED_COLLATORS. However, I am getting this exception for that line of code:
04-18 09:50:03.585: ERROR/Database(3471): sqlite3_open_v2("/data/data/edwin11.myapp/databases/myapp.db", &handle, 6, NULL) failed
04-18 09:50:03.665: ERROR/AndroidRuntime(3471): java.lang.RuntimeException: An error occured while executing doInBackground()
04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at android.os.AsyncTask$3.done(AsyncTask.java:200)
04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:234)
04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:258)
04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at java.util.concurrent.FutureTask.run(FutureTask.java:122)
04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:648)
04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:673)
04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at java.lang.Thread.run(Thread.java:1060)
04-18 09:50:03.665: ERROR/AndroidRuntime(3471): Caused by: android.database.sqlite.SQLiteException: unable to open database file
04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at android.database.sqlite.SQLiteDatabase.dbopen(Native Method)
04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1584)
04-18 09:50:03.665: ERROR/AndroidRuntime(3471): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:638)...
Doing some testing just before that line of code (using File.isExists) shows that the file /data/data/edwin11.myapp/databases/myapp.db does not exist. Would that be the cause of the error? (Or am I just using SQLiteDatabase.openDatabase the wrong way?) Would it help if I create the file beforehand? (Shouldn't that be taken care of by the SQLiteDatabase.CREATE_IF_NECESSARY flag that I passed in?) If creating the file manually is the way to go, is it just an empty file, or do I have to write something to it?
View 1 Replies
View Related
Nov 8, 2010
Recently I very often get error reports from users that upgrade their OS. > This includes at least 1.5, 1.6, 2.1 and custom ROMs. Anybody else seeing these? Any idea what to do about it?
View 3 Replies
View Related
Jun 23, 2010
In my app, I'm supporting the backup and restoration of the Sqlite db file. I need to close and re-open my database connection after the restore. How can I do this?
View 2 Replies
View Related
Sep 15, 2010
When I create a instance of the SQLiteOpenHelper, I always need a "Context" to be passed as its constructor's argument. To use this "Context", in my service layer class, I extends Activity class, though I do not display this activity on the screen because it is my service layer. I always get NullPointer exception when I open the SQLiteOpenHelper in my service layer class, Is it because my service layer class extends the Activity class but I did not show this activity on mobile screen? (That's there is no intent to my service layer class), if it is so, how to get rid of it if I wanna open a SQLiteOpenHelper in my service layer class which do not need to extends Activity, but need a Context object to pass to SQLiteOpenHelper?
View 2 Replies
View Related
Jun 30, 2010
Is there a way to open and edit word file in android and if this application exist does it has an open API?
View 1 Replies
View Related
Mar 27, 2009
I am having problem using webview in my application. When ever the webviewclient and webview is trying to load, it will throw me and uncaugh exception. Code...
View 2 Replies
View Related
Mar 21, 2010
I get records from the system by quering a ContentResolver. I maintain the order of the items in the database. So I want to display the items in the order taken from my database.
How do I merge these two informations?
I am looking after an alternative way now. As what I ideally want is:
Get order of contacts by a custom order held in my database (this involves joining CR with my DB cursor, and doing an order by, later seams it's not possible with CursorJoiner) but there is more, if the join is not unique I want to sort by contact's name as last measure
Which is impossible using Cursor and Joiners, because of the missing feature of order bys, also I need to return a Cursor, as I will be using the in an ExpandableList
Also this translated to TSQL it would look like
select * from contactsdata
left join category on contactsdata.catid=category.id
order by category.pos asc, contact.display_name asc
So I am looking now after an alternative. I have in mind to load in a temporary DB table all data from CR, then do the query on the temporary table where I can join tables and do order bys? How does this sound to you?
View 1 Replies
View Related
Jan 10, 2010
I open task manager i find no apps running i leave it for 1 min for example and i reopen it, i find some apps running without i run them such as MAIL, Touch input, com.htc why do they open
View 1 Replies
View Related
Apr 2, 2010
Recently I very often get error reports from users that upgrade their OS. This includes at least 1.5, 1.6, 2.1 and custom ROMs. Anybody else seeing these? Any idea what to do about it?
View 17 Replies
View Related
Oct 16, 2010
Is this possible? I am trying to open a SQLite database cursor in one activity, and pass it to another activity.
View 2 Replies
View Related
Sep 21, 2009
In the API Demo, there is example on using Simple Cursor Adapter. However, it is using the MediaS tore cursor. Is there any method so that I can use other external cursor prepare by SQL database. I don't know what should I input to the from String.
View 2 Replies
View Related
Jul 1, 2010
Here is my code for my db class:
package one.two;
import java.util.List;
import android.app.ListActivity;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import java.util.ArrayList;
public class DBAdapter extends ListActivity
{public String status = "status";
public String id = "id";
public String arrival = "arrival";
public String destination = "destination";
public String ferry = "ferry";
private static String DB_PATH = "/data/data/one.two/databases/";
private static final String DATABASE_NAME = "ferry.db";
private static final String DATABASE_TABLE = "port";
public static Context context;
public Cursor c;
public static SQLiteDatabase DbLib;
//overloaded non-null constructor
public DBAdapter(Context context) {
DbLib = context.openOrCreateDatabase(DATABASE_NAME,
SQLiteDatabase.CREATE_IF_NECESSARY,null);
System.out.println("OpenOrCreateDB Done");
} public class DatabaseHelper extends SQLiteOpenHelper {
Context context;
DatabaseHelper(Context context){
super(context, DATABASE_NAME, null, DATABASE_VERSION);
this.context = context;
}//end constructor DatabaseHelper
// ---closes the database---
public void close() {
DBHelper.close();
}//end close()
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion,
int newVersion){
}//end onUpgrade()
@Override
public void onCreate(SQLiteDatabase db){
}//end onCreate()
}// end class DatabaseHelper
private static DatabaseHelper DBHelper;
private static final int DATABASE_VERSION = 1;
public static ArrayList<String> getAllTitles(){
ArrayList<String> port = new ArrayList<String>();
Cursor c=null;
c = DbLib.query("port"
new String[] { "status", "id", "arrival",
"destination", "ferry" }, null, null,
null, null, null);
try {
if (c!=null) { // start - when there is at least 1 record
System.out.println("Cursor is NOT NULL");
int i =0;
for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext())
{// Debug Stm
System.out.println("Record No. "+i);
System.out.println(c.getString(0));
System.out.println(c.getString(1));
System.out.println(c.getString(2));
System.out.println(c.getString(3));
System.out.println(c.getString(4));
// Assign database cursor.records to arraylist
port.add(i,c.getString(0));
port.add(i,c.getString(1));
port.add(i,c.getString(2));
port.add(i,c.getString(3));
port.add(i,c.getString(4));
i = i + 1;
} } // end - where there is at least 1 record
} finally {
if (c!=null) {
c.close();
} } return port;
}//end getAllTitles()
public void open() {
//Open the database
String myPath = DB_PATH + DATABASE_NAME;
DbLib = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
} }//end class DBAdapter
My Arrival class
package one.two;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import android.app.ListActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class Arrival extends ListActivity
{ private ListView listView;
/** Called when the activity is first created. */
public void onCreate(Bundle savedInstanceState)
{ ArrayList<String> retList = new ArrayList<String>();
System.out.println("Start onCreate Function");
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
System.out.println("In onCreate Function");
System.out.println("In of GetData");
DBAdapter db = new DBAdapter(this);
System.out.println("DB Open");
db.open();
System.out.println("DB Opened");
retList = getData();
System.out.println("Out of GetData");
// force count no. of records in table
// dump to check index
int cnt = 2;
int i=0;
for (i = 0; i<cnt; i++)
System.out.println(retList.toString());
listView = (ListView) findViewById(android.R.id.list);
SimpleCursorAdapter mAdapter = new SimpleCursorAdapter(this, android.R.id.list, null, null, null);
this.setListAdapter(mAdapter);
// db.close();
} @SuppressWarnings("static-access")
public static ArrayList<String> getData()
{ ArrayList<String> items = DBAdapter.getAllTitles();
// titles ???? redundant
//ArrayList<String> titles = new ArrayList<String>(items);
System.out.println("Return a LIST titles");
return items;
} }
View 1 Replies
View Related
Jun 29, 2009
I been using custom adapters based on the BaseAdapter and I usually populate my data at the getView() funtion.
Now I'm trying to write my custom adapter for my database cursor which now will be based on a CursorAdapter.
I'm getting confused where I should do the populating work? Along with how do I implement my inflating and populating "smart/efficient code based on RomainGuy presentation."
View 8 Replies
View Related
Oct 4, 2009
I'm working on an app, and one activity has a worker thread that initiates a database query, and if there are results once it has returned I would like to send these results to a new activity that will display them. Unfortunately I don't see a way to pack the Cursor object into the Intent object that I am using to start the new activity. When I was doing Windows Mobile development in the past all I would do is edit the constructor for the window to pass in the data, I've searched around but I can't find a similar solution for Android. What is the best way to pass my database results into the new activity?
View 3 Replies
View Related
Nov 18, 2010
How do i do an edit form functionality in android. I am a new bee to android. How do i pass on database values to XML and then submit it back..
View 1 Replies
View Related
May 6, 2009
I am seeing the exception in 'adb logcat'.But I don't know if it is caused by my application or android platform.Can you please give me any idea how to troubleshoot this exception?
View 3 Replies
View Related
Aug 25, 2009
How do you populate a spinner from a cursor accessing an SQLite database?
View 2 Replies
View Related
Jun 30, 2009
I am having some trouble working with the SQLite database. I am able to create the database, add to it, and delete from it with no problem by following the Notepad examples, but I am trying to avoid duplicates and therefore want to check to see if an entry exists already.
Below is the code I have for testing to see if a game exists. I get the correct Log message of "No Games" when there are no games, as well as the correct value for column from getColumnIndex which is proven to me by the log printout telling me that column = 1.
The error message that I receive if I don't catch the exception says "Caused by android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 1
Where is Index -1 being requested if my call to getColumnIndex is returning 1? Code...
View 3 Replies
View Related
May 18, 2010
I have activity A and I used managedQuery in Activity A. I have an adpater which extends from BaseAdapter. In GetView I access the mcursor to get fields.If I click a button on Activity A it goes to B, A---> B.The problem arises when I am in activity B *and it's visible(B), the error is thrown from Acitivity A.I dont understand why I get the error from Activity A. Activity B is visible now and A is in background.There was a post already on this group with similar error but there was no response.I was hoping if someone encountered this and found a solution.
View 2 Replies
View Related
Jan 10, 2010
Maybe I'm going about this the wrong way, but if so, please correct me. Here is the situation: I have a query which returns URI strings for ringtones stored in a database.
I am trying to add a "column" to this cursor with the ringer "Title" (since this can change outside my program). I can successfully user RingtoneManager to get the title, but I cannot figure out how to add this "column" to the cursor data for later use. Here is what I have so far: Code...
View 2 Replies
View Related
Oct 21, 2009
I am developing an LBS-based website specifically targeted at mobile phones and wanted to link it with Android's Google Maps app. On the iPhone the OS does this automatically i.e. user clicks google map http/ url link, browser closes, maps app opens up. s there a way to do this in android as at the moment it just opens the normal google maps website which isn't very mobile friendly! If so then I presume it would be some specific 'html' tag or javascript solely for Android?
View 4 Replies
View Related
May 9, 2009
I've managed to get some basic 3d stuff working quite nicely on my Android device. My question is how do you define/create more complicated 3d models? Obivously using int[] arrays of vertices hand written is quite time consuming and error prone. Are there any modelling tools that can be used?
View 2 Replies
View Related
Jun 9, 2009
I would like to buy Open Home,Im on Rogers I see all the skins & themes but you need Open Home for them to work we have no paid Apps in our market is there someplace I can buy it
View 5 Replies
View Related
May 8, 2009
how are you set up?
P1-Google Widget on top, Browser, email, and youtube apps, and Most used Bookmarks.
P2-Friends Contact shortcuts
P3-Dialer/Contacts apps/Family contacts shortcuts
View 1 Replies
View Related
Aug 4, 2010
For those of you using an open home, which one are you using and what makes you prefer it? I am thinking of trying one.
View 6 Replies
View Related
