Load local data if internet connection not available - android

I have an android application that display data from my external Database so from several tables. Everything work fine while internet connection is available (all data come from URL link and they are been parsed with volley). But how can I save and load lastest data when internet is not available.
What is the best way to do that. Im new in android....
Please help.


Normally Volley and also HttpStack it uses allows you to seamlessly cache responses. This however depends on your responses and requests. Those cache strategies obeys http cache definition. If You want to have different behavior for Volley you can just override this part. basically when you create a request you can override
protected Response<String> parseNetworkResponse(NetworkResponse response) {
and instead of
return Response.success(parsed, HttpHeaderParser.parseCacheHeaders(response));
you do
long now = System.currentTimeMillis();
Cache.Entry entry = HttpHeaderParser.parseCacheHeaders(response);
entry.ttl = now + 30l * 24 * 60 * 60 * 1000; //kepps cache for 30 days
//entry.softTtl = now + 30l * 24 * 60 * 60 * 1000; //will not refresh for 30 days
return Response.success(parsed, entry);
Which basically will refresh the cache every time the server specifies so but will always return the cache for 30 days unless changes .
Note that here you may receive 2 callbacks in response or in one response and 1 error(in case of no network). the first one will be the cache.
UPDATE:
if you add (which is commented in the example above):
entry.softTtl = now + 30l * 24 * 60 * 60 * 1000; //will not refresh for 30 days
this will affect the refresh of the cache. in this case it wont event try to refresh the cache for 30 days. In that case you will return 1 response.
Note that I never would recommend solution like this because cache needs to be updated, especially if you want to fake cache on POST requests as in your case.
Receiving 2 callbacks is not really an issue as you can handle this seamlesly for the user and update UI when needed. also if you want to have more control you can know which one is from the cache and which one form the network by implementing your
ResponseDelivery
or extend
ExecutorDelivery
and then check for the param
mResponse.intermediate
and decide what to do then. ResponseDelivery is the one which calls the callbacks.
Update
similar question and examples here


if you have to store only small chunk of data then use SharedPreferences
If you have large data then use SQLite
Use below code to create and update SQLite DB
public class SqlMangaeMenu
{
SQLiteDatabase db1 = null;
private static String DBNAME = "YourLocal.db";
Context gcntxt;
public SqlMangaeMenu(Context cntxt)
{
// TODO Auto-generated constructor stub
gcntxt=cntxt;
db1 = cntxt.openOrCreateDatabase(DBNAME, Context.MODE_PRIVATE,null);
db1.execSQL("CREATE TABLE IF NOT EXISTS mytbl(appid varchar PRIMARY KEY,appname varchar,iconcode varchar,msgidentfier varchar,scode varchar,image blob,imagehdr blobhdr); ");
}//EOF Constructor
public void insertContent(String appid,String appname,String iconcode,String msgidentifier,String scode,Bitmap bmp,Bitmap bmphdr)
{
ContentValues contentValues = new ContentValues();
contentValues.put("appid", appid);
contentValues.put("appname", appname);
contentValues.put("iconcode", iconcode);
contentValues.put("msgidentfier", msgidentifier);
contentValues.put("scode", scode);
byte[] blob = null,blobhdr=null;
if(bmp!=null)
{
ByteArrayOutputStream outStr = new ByteArrayOutputStream();
bmp.compress(CompressFormat.PNG, 100, outStr);
blob = outStr.toByteArray();
}
contentValues.put("image", blob);
if(bmphdr!=null)
{
ByteArrayOutputStream outStr1 = new ByteArrayOutputStream();
bmphdr.compress(CompressFormat.PNG, 100, outStr1);
blobhdr = outStr1.toByteArray();
}
contentValues.put("imagehdr", blobhdr);
Log.d("db", "SQL Writing"+appid+appname+iconcode+msgidentifier+scode);
try {
// db1.insert("mytbl",null,contentValues);
db1.insertWithOnConflict("mytbl", null, contentValues,SQLiteDatabase.CONFLICT_IGNORE);
} catch (Exception e)
{
// TODO: handle exception
}
db1.close();
}//EOF insertContent
// Deleting single contact
public void Delete_appid(String id)
{
db1.delete("mytbl", "appid" + "=" + id, null);
db1.close();
}//EOF Delete_appid
public void readAppId()
{
MyApplication.dbappid=new ArrayList<String>();
String appid;
try
{
Cursor c = db1.rawQuery("SELECT * FROM mytbl", null);
//Cursor c = db1.rawQuery("SELECT MAX(ID) FROM mytbl", null);
if(c!= null)
{
if (c.moveToFirst())
{
do {
appid=c.getString(c.getColumnIndex("appid"));
MyApplication.dbappid.add(appid);
}while(c.moveToNext());
}
}
Log.d("db", "SQL Reading");
db1.close();
}
catch(Exception e)
{
System.out.println(e);
}
}//EOF readAppId
public void readDataandImage()
{
Bitmap image=null,imagehdr = null;
//Bitmap images
MyApplication.dbimg=new ArrayList<Bitmap>();
MyApplication.dbhdrimage=new ArrayList<Bitmap>();
//String
MyApplication.dbappname=new ArrayList<String>();
MyApplication.dbappid=new ArrayList<String>();
MyApplication.dbiconcode=new ArrayList<String>();
String appname,appid,iconcode;
try
{
Cursor c = db1.rawQuery("SELECT * FROM mytbl", null);
if(c!= null)
{
if (c.moveToFirst())
{
do {
image=null;imagehdr=null;
byte[] blob = c.getBlob(c.getColumnIndex("image"));
byte[] blobhdr = c.getBlob(c.getColumnIndex("imagehdr"));
appid=c.getString(c.getColumnIndex("appid"));
appname=c.getString(c.getColumnIndex("appname"));
iconcode=c.getString(c.getColumnIndex("iconcode"));
if(blob!=null)
{
image = BitmapFactory.decodeByteArray(blob, 0, blob.length);
}
if(blobhdr!=null)
{
imagehdr = BitmapFactory.decodeByteArray(blobhdr, 0, blobhdr.length);
}
//Images
MyApplication.dbimg.add(image);
MyApplication.dbappid.add(appid);
//String
MyApplication.dbappname.add(appname);
MyApplication.dbiconcode.add(iconcode);
MyApplication.dbhdrimage.add(imagehdr);
}while(c.moveToNext());
}
}
Log.d("db", "SQL Reading");
db1.close();
}
catch(Exception e)
{
System.out.println(e);
}
}//EOF readDataandImage
public int dbRowCount()
{
int rowcnt=0;
String countQuery = "SELECT * FROM mytbl";
//SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db1.rawQuery(countQuery, null);
rowcnt = cursor.getCount();
cursor.close();
db1.close();
Log.d("db", "Numrecs"+rowcnt);
return rowcnt;
}//EOFdbRowCount
}
where MyApplication is a static class to hold the read values.

Related

Constantly retrieve data from database in a infinite loop

I created a database with a table named flagTable, this table only has two fields, which are id(auto increment) and an integer field. Next, in my program, I have a button that will trigger a thread to start. When the thread is starting, it constantly retrieve data from database, and check for the for the value, if the value is equal to one then it will trigger another new Thread, something like this:
private class statusOfStrummingInAnotherDevice extends Thread {
int value;
public void run() {
try{
while(true){
try{
if(flagCursor == null){
flagCursor = cdb1.getFlagAll();
}
}catch(Exception e){break;}
try{
Log.i("MAIN3ACTIVITY","getting status");
int size = cdb1.getSize(flagCursor);
Log.i("MAIN3ACTIVITY","SIZE is" + String.valueOf(xyz));
for(int i = 0 ; i < size ; i++){
flagCursor.moveToPosition(i);
Log.i("MAIN3ACTIVITY","getting status jkasdfasdf");
value = cdb1.getFlag();
if(value == 1){
Log.i("FLAGCURSOR=====>>>>","Succesful");
releasingNotes = new ReleasingNotes(IntendedChord);
releasingNotes.start();
//break;
}
cdb1.updateFlag(0);
Log.i("FLAGCURSOR=====>>>>",String.valueOf(value));
}
flagCursor = null;
}catch(Exception e){break;}
Log.i("MAIN3ACTIVITY","thread is sleeping");
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
break;
}
}
}catch(Exception e){
}
}
}
In the meantime, the data that were retrieved from the database is using this function:
public Cursor getFlagAll(){
return getReadableDatabase().rawQuery(
"SELECT _ID, flag from flagTable", null);
}
And, the data that were updated to the database through this method:
public int updateFlag(int i) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("flag",i);
return db.update("flagTable" , contentValues , "_ID" + "= ?",new String[]{String.valueOf(1)});
}
Now, above codes will give no error, however, the data that were retrieved from the database is always 1, it keeps trigger a new function. In my above codes, I stated if the value is equal to 1, then the current thread will trigger a new thread to start, When its finished, the program will update the current data to 0. So that, the next round of the infinite loop can stop triggering new thread until a the conditon is met. What is problem overhere? did my codes really updated the new value? or I need to referesh the database every time I updated a new value.

Use Listeners to your database.
use SQLiteTransactionListener and do your things in onCommit()
Some guide in details here :
https://developer.android.com/reference/android/database/sqlite/SQLiteTransactionListener.html and
http://www.programcreek.com/java-api-examples/index.php?api=android.database.sqlite.SQLiteTransactionListener

Android sqlite insert issue

I'm trying to add data from a csv file to an sqlite database on Android.
My data in csv file looks like this
SID,Attended,Serial,Time,Title,Forenames,Last name,Parking,How many people will be in your party (including yourself)?,Any access requirements?,Access requirements,Timetable
9290,,0000000092906,2014-04-07 18:44:59,Miss,foo1,foo1,,2,No,,fooo
9291,,0000000092907,2014-04-08 18:44:59,Miss,foo2,foo2,,2,No,,fooo
9292,,0000000092908,2014-04-07 18:44:59,Miss,foo3,foo3,,2,No,,fooo
I created a DatabaseHelper to import it :
public void importFromCSV(String filename)
{
//deleteTable();
SQLiteDatabase db = this.getReadableDatabase();
String next[] = {};
try {
db.beginTransaction();
CSVReader reader = new CSVReader(new FileReader(filename));
reader.readNext();
for(;;) {
next = reader.readNext();
if(next != null) {
this.addPerson(new Person(Long.parseLong(next[0]),
next[1],
Long.parseLong(next[2]),
next[3],
next[4],
next[5],
next[6],
next[7],
Integer.parseInt(next[8]),
next[9],
next[10],
next[11]));
} else {
break;
}
}
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
finally {
db.endTransaction();
}
}
But when I try to do a SELECT on my database, I got an error : CursorIndexOutOfBoundsException : Index 0 requested, with a size of 0.
I did some research and found that this error was because of an empty cursor.
Here is my getPerson function :
public Person getPerson(long sid){
// 1. get reference to readable DB
SQLiteDatabase db = this.getReadableDatabase();
// 2. build query
Cursor cursor =
db.query(TABLE_PERSONS, // a. table
COLUMNS, // b. column names
" sid = ?", // c. selections
new String[] { String.valueOf(sid) }, // d. selections args
null, // e. group by
null, // f. having
null, // g. order by
null); // h. limit
// 3. if we got results get the first one
if (cursor != null) {
cursor.moveToFirst();
}
// 4. build pers object
Person pers = new Person();
pers.setSid(Long.parseLong(cursor.getString(0)));
pers.setAttended(cursor.getString(1));
pers.setSerial(Long.parseLong(cursor.getString(2)));
pers.setTime(cursor.getString(3));
pers.setTitle(cursor.getString(4));
pers.setForename(cursor.getString(5));
pers.setLastname(cursor.getString(6));
pers.setParking(cursor.getString(7));
pers.setNumberpeople(Integer.parseInt(cursor.getString(8)));
pers.setAccessreqornot(cursor.getString(9));
pers.setAccessreq(cursor.getString(10));
pers.setTimetable(cursor.getString(11));
Log.d("getPerson()", pers.toString());
// 5. return pers
return pers;
}
I think the issue is due to my addPerson function called in importFromCsv().
My log at the beginning of the addPerson function returns me the right thing, but I think the db.insert is not going well. But I don't have any error on this.
My addPerson function :
public void addPerson(Person pers){
Log.d("addPerson", pers.toString());
// 1. get reference to writable DB
SQLiteDatabase db = this.getWritableDatabase();
// 2. create ContentValues to add key "column"/value
ContentValues values = new ContentValues();
values.put(SID, pers.getSid());
values.put(ATTENDED, pers.getAttended());
values.put(SERIAL, pers.getSerial());
values.put(TIME, pers.getTime());
values.put(TITLE, pers.getTitle());
values.put(FORENAME, pers.getForename());
values.put(LASTNAME, pers.getLastname());
values.put(PARKING, pers.getParking());
values.put(NUMBERPEOPLE, pers.getNumberpeople());
values.put(ACCESSREQORNOT, pers.getAccessreqornot());
values.put(ACCESSREQ, pers.getAccessreq());
values.put(TIMETABLE, pers.getTimetable());
// 3. insert
db.insert(TABLE_PERSONS, // table
null, //nullColumnHack
values); // key/value -> keys = column names/ values = column values
}
Thanks for your reading time, I would be really grateful if someone had any idea.
EDIT : Stacktrace :
07-08 12:01:57.755: D/addPerson(10828): Person [sid=9290, attended=, serial=92906, time=2014-04-07 18:44:59, title=Miss, forename=Ladina, lastname=Clement, parking=, numberpeople=2, accessreqornot=No, accessreq=, timetable=Fine]
07-08 12:01:57.755: D/addPerson(10828): Person [sid=9291, attended=, serial=92907, time=2014-04-08 18:44:59, title=Miss, forename=Ladina2, lastname=Clement2, parking=, numberpeople=2, accessreqornot=No, accessreq=, timetable=Fine]
07-08 12:01:57.763: D/addPerson(10828): Person [sid=9292, attended=, serial=92908, time=2014-04-07 18:44:59, title=Miss, forename=Ladina3, lastname=Clement3, parking=, numberpeople=2, accessreqornot=No, accessreq=, timetable=Fine]
07-08 12:01:59.193: D/ViewRootImpl(10828): ViewRoot TouchDown(Absolute) DOWN (357 , 189)
07-08 12:01:59.247: D/getAllPersons()(10828): []

Change this line:
if (cursor != null) {
cursor.moveToFirst();
}
to
if (!cursor.moveToFirst()) {
// do something when there are no results
}
The null check on the cursor is redundant. You can check if the cursor is empty by doing cursor.moveToFirst(). If it returns false you should prevent executing further commands on the cursor like you are doing later e.g. cursor.getString(0).

My data is like this:
25-07-14 12:00,15,52,16,50,42,58,63,62,52
22-06-14 14:00,15,52,16,50,42,58,63,62,52
12-09-14 19:00,45,51,16,50,42,58,13,34,52
02-02-14 16:00,15,52,16,50,42,58,63,62,52
01-05-14 12:00,15,52,16,50,42,58,63,62,52
i have read that data like this you can find once. In the file path i am checking is that csv file are not.
FilePath = data.getData().getPath();
if(FilePath.substring(FilePath.length()-4).endsWith(".csv"))
And the code is here
private void readcsvfile() {
if(FilePath.length()>4)
{
dataGridTable = new DgaDataGridTable(context);
equipmentTable = new EquipmentTable(context);
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(FilePath)));
String line;
while ((line=reader.readLine())!=null)
{
info = new DgaDataGridInfo();
String[] rowData = line.split(",");
if(rowData[0].length()!=0&&rowData[1].length()!=0&&rowData[2].length()!=0&&rowData[3].length()!=0&&rowData[4].length()!=0&&rowData[5].length()!=0&&rowData[6].length()!=0&&rowData[7].length()!=0&&rowData[8].length()!=0&&rowData[9].length()!=0)
{
info.setDateadded(rowData[0]);
info.setH2(Integer.parseInt(rowData[1]));
info.setCh4(Integer.parseInt(rowData[2]));
info.setC2h2(Integer.parseInt(rowData[3]));
info.setC2h4(Integer.parseInt(rowData[4]));
info.setC2h6(Integer.parseInt(rowData[5]));
info.setCo(Integer.parseInt(rowData[6]));
info.setCo2(Integer.parseInt(rowData[7]));
info.setO2(Integer.parseInt(rowData[8]));
info.setN2(Integer.parseInt(rowData[9]));
info.setTdcg(Integer.parseInt(rowData[1])+Integer.parseInt(rowData[2])+Integer.parseInt(rowData[5])+Integer.parseInt(rowData[4])+Integer.parseInt(rowData[3])+Integer.parseInt(rowData[6]));
equipmentname = equipment_spinner.getSelectedItem().toString();
info.setEquipid(equipmentTable.getEquipmentId(equipmentname));
dataGridTable.insertRecord(info);
Toast.makeText(this, "Dga Records Succesfully Added", Toast.LENGTH_LONG).show();
loadAllDgaRecords();
}
else
{
showAlertDialog();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
else
Toast.makeText(this, "Please choose csv file", Toast.LENGTH_LONG).show();
}
Thanks

too much time in reading sms from database and storing it in to text file

I'm reading sms record from database and write them into text file. But it takes too much time 3 to 4 mins to read n write 3500 records. If records are much more than that it takes plenty of time which is not appreciable. My code is:
final Cursor cur1 = c.getContentResolver().query(Uri.parse("content://sms/"), null, null, null, "date ASC");
final int size = cur1.getCount();
final int sleeptimer = size;
final SMS [] sms = new SMS[size];
final String baseDir = Environment.getExternalStorageDirectory().getAbsolutePath()+ File.separator + "account.txt";
FileWriter fw = null;
try {
fw = new FileWriter(baseDir);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
final BufferedWriter writer = new BufferedWriter(fw);
Thread myThread = new Thread()
{
public void run()
{
try
{
int currentwait = 0;
int j=0;
while(currentwait < sleeptimer)
{
sleep(200);
currentwait+=200;
for(int i = 0 ; i < 200 ; i++)
{
if(!cur1.moveToNext())
{
break;
}
ContactInfo p = new ContactInfo();
String content = cur1.getString(cur1.getColumnIndex("body"));
String number = cur1.getString(cur1.getColumnIndex("address"));
long date = cur1.getLong(cur1.getColumnIndex("date"));
String protocol = cur1.getString(cur1.getColumnIndex("protocol"));
String name = p.getName(number, c);
String type = null;
Calendar cal=Calendar.getInstance();
cal.clear();
cal.setTimeInMillis(date);
String date_time=String.format("%1$te %1$tB %1$tY,%1$tI:%1$tM:%1$tS %1$Tp",cal);
if( protocol == null )
{
type = "Outbox";
}
else
type = "Inbox";
try{
writer.write("Type: " + type);
writer.newLine();
writer.write("Name: " + number+"<"+name+">");
writer.newLine();
writer.write("Date: " + date_time);
writer.newLine();
writer.write("Content: " + content);
writer.newLine();
writer.newLine();
} catch (IOException e) {
Log.i("INFO", e.getMessage().toString());
}
//Log.i("INFO", content+" "+j);
sms[j] = new SMS(type , name , number , date_time , content );
j++;
}
}
}
catch(Exception e)
{
}
finally{
try{
writer.flush();
writer.close();
}
catch (Exception e) {
}
uploadtoserver(baseDir);
}
}
};
myThread.start();
any idea to improve it ???thanks :)))

Just remove this line:
sleep(200);

Call setMaxSqlCacheSize to increase the cache size. Default is 10. Try setting 20 first and see whether the time reduces to half..
Or/And
You can execute this sqlite query before performing any operation on db and see if that improves the speed. Changing the temp store to memory should improve the read write speed..
PRAGMA temp_store = 2; /* 0 | DEFAULT | 1 | FILE | 2 | MEMORY; */
When temp_store is MEMORY (2) temporary tables and indices are kept in as if they were pure in-memory databases memory
Also
PRAGMA page_size = bytes;
Query or set the page size of the database. The page size must be a power of two between 512 and 65536 inclusive.
Probably you can pass these statements either to execSQL(String sql) or to query(). Try and let me know how it works.
Check out other PRAGMAs that Sqlite supports: http://www.sqlite.org/
Update:
From documentation of query API:
For best performance, the caller should follow these guidelines:
Provide an explicit projection, to prevent reading data from storage that aren't going to be used.
Use question mark parameter markers such as 'phone=?' instead of explicit values in the selection parameter, so that queries that differ only by those values will be recognized as the same for caching purposes.

app not showing data when opend it for the second time

i am looking to make game of questions and answers.i had taken a textview and 4 radio group buttons.and i am fetching data from the external data file from the assets folder.when i installs the app into the emulater it works fine.when i reopens the app in the emulater it is just showing question not showing any text in the radio buttons.here is my code in the data base file
public String makeatext(String My_database_table,int i) {
SQLiteDatabase myDB = getDatabase();
String results = new String();
try {
String firstColumn = "questions";
// final String KEY_ROWID = "id";
// Cursor c = myDB.rawQuery("SELECT questions FROM " +
// My_database_table+ ";",null);
Cursor c = myDB.query(true, My_database_table,
new String[] { firstColumn },null, null, null, null, null,
null);
int iquestion = c.getColumnIndex(firstColumn);
if(c.moveToPosition(i)){
results = c.getString(iquestion)+"\n";
}
//while (c.moveToPosition(1)) {
//String firstName = c.getString(iquestion);
//results =(" "+ firstName + " ");
//}
return results;
} catch (Exception e) {
Log.e("ERROR","ERROR in Make test file :"+e.toString());
e.printStackTrace();
// TODO: handle exception
}
return results;
}
and in the Activity file i am just calling it as
String shoow = myDb.makeatext("question", Qno);
showQuestion.setText(shoow);
and on the top of the oncreate methode i initilized the data base asprivate final DataBaseHelper myDb = new DataBaseHelper(this);
can any one say me why this is happenig.do i need to write the for loop in the activity file also or shall i take a cursor in the activity class .
plz help me out
thanks in advance
for radio buttons the code in the database file is as follows as i have 4 buttons the code for 4 buttons will be as same as this
public String makeExtra1(String My_database_table ,int positions) {
String results = new String();
try {
String secondColumn = "Extra1";
Cursor c = myDataBase.query(true, My_database_table,
new String[] { secondColumn }, null, null, null, null, null,
null);
int iExtra1 = c.getColumnIndex(secondColumn);
if(c.moveToPosition(positions)){
results = results+c.getString(iExtra1)+"\n";
}
return results;
} catch (Exception e) {
Log.e("ERROR","ERROR in Make test file :"+e.toString());
e.printStackTrace();
// TODO: handle exception
}
return results;}
and in the Activity file
String showextra1 = myDb.makeExtra1("question", Qno);
r0.setText(showextra1);
i repeted this thing for 4 times as changing the makeExtra2,3,4 and in the assinged to r1,r2,r3 as above.

You should call Cursor.close() after reading data from it. Better to do it finally{} block.
If you want to raise only one answer per query - fill where param of myDataBase.query().

The unreachable code error is because you are writing finally{} block after return results;
Move this line after the finally{} block, eclipse will not give you any error.
Also do use myDB.close(); in this finally block.

to get resultset from pre-complie statement in android

I have created complied statement given below. Now my question is how to get resultset of the query.
Here is my code:
DataBaseHelper dbHelper=new DataBaseHelper(context);
dbHelper.createDataBase();
dbHelper.openDataBase();
SQLiteDatabase db = dbHelper.getWritableDatabase();
SQLiteStatement st=db.compileStatement("select taskid from task where taskdate=?");
st.bindString(1,"2011/09/05");
st.execute();
This works without any error. But I want the result set of the given query. Please help..

The result set isn't available, at least for now, in sqlite. It all depends on exactly what information you want from the ResultSet or ResultSetMetaData, etc, but there are other means of obtaining almost the same information.
You can get detailed information about the columns in a table with the following, used as if it were a SELECT, and the information about the columns will be presented:
pragma table_info(myTable) ;
See http://www.sqlite.org/pragma.html#pragma_table_info for more information.
If you want the information concerning a specific SELECT, you can get information from the resulting Cursor. See http://developer.android.com/reference/android/database/Cursor.html
For example, if you want the type of data for a column, you can use the getType() method in the newer versions of Android, or use a series of "get" functions to determine at least what type is readable, with this horrible code:
Cursor curs = db.rawQuery(sqlStr, null);
int numberOfColumns = curs.getColumnCount();
String []colNames = new String[numberOfColumns];
String []colTypes = new String[numberOfColumns];
for(int iCol=1; iCol<=numberOfColumns; iCol++) {
colNames[iCol-1] = curs.getColumnName(iCol-1);
colTypes[iCol-1] = null; //curs.getType(iCol);
}
while(curs.moveToNext()) {
// this code assumes that the first row has the same data types
// as the rest of the rows
for(int iCol=1; iCol<=numberOfColumns; iCol++) {
String colName = colNames[iCol-1];
String colType = colTypes[iCol-1];
if(colType==null) {
// determine column type
try {
curs.getString(iCol-1);
colType = colTypes[iCol-1] = "text";
} catch (Exception ignore) {
try {
curs.getLong(iCol-1);
colType = colTypes[iCol-1] = "integer";
} catch (Exception ignore1) {
try {
curs.getFloat(iCol-1);
colType = colTypes[iCol-1] = "real";
} catch (Exception ignore2) {
try {
curs.getBlob(iCol-1);
colType = colTypes[iCol-1] = "blob";
} catch (Exception ignore3) {
colType = colTypes[iCol-1] = "other";
}
}
}
}
}
if("text".equals(colType)) {
... curs.getString(iCol-1);
} else
if("real".equals(colType)) {
... curs.getDouble(iCol-1);
} else
if("integer".equals(colType)) {
... curs.getInt(iCol-1);
} else { // unknown type
... colType+"-"+curs.getString(iCol-1);
}
}
}
Other information is available in a similar manner, depending on your need.

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