I have created a table with id and tag as column.
id is set as primary key. And in tag column, I have entered more than one value.
So now i want to get the count of how many times the tag value is repeated.
So my table is like this.
Id Tag
---------------------
1 Friend, Family
2 Family, Enemy
and my output should be like this:
friend (1)
family(2)
Enemy(1)
I have written a code but not getting the result I want.
This is MyDatabase.java code:
public Details calculateCount()
{
Details detail = null;
try
{
SQLiteDatabase db=this.getWritableDatabase();
String selectQuery=("select count(*),Tags from photodetails group by Tags" );
Cursor cursor = db.rawQuery(selectQuery, null);
if(cursor.moveToLast())
{
do
{
detail=new Details(Integer.parseInt(cursor.getString(0)),(cursor.getString(1)));
}while( cursor.moveToNext());
}
}
catch(Exception e)
{
e.printStackTrace();
}
return detail;
}
And this is MAinActivity.java code
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_activity2);
getActionBar().setDisplayHomeAsUpEnabled(true);
MyDataBase MyDB = new MyDataBase(this);
Log.d(LOGCAT,"Entered MAinActivity2");
Details c= MyDB.calculateCount();
if(c == null)
{
Log.d(LOGCAT,"C is null");
}
else
{
Log.d(LOGCAT,c.getTag()); // Here iam only retrieving tag dont know how to get that count.
}
}
Pls help me out on this
If you want to get a count, you're going to want to create a method such as a int getCount() method that will return the int value of the count. Currently, you have Details calculateCount() which will return a Details object.
Related
I have a JSON Array which consists of some contacts in my phonebook who are also users of my app. For example, the JSON Array might look like :
[{"contact_phonenumber":"11111"},{"contact_phonenumber":"22222"},{"contact_phonenumber":"33333"}]
phoneNumberofContact is a string which, in the do statement in my code below, returns every contact in my phone. How can I check which phoneNumberofContact numbers appear in my JSON Array and then, besides those contacts in the ListView put the words '- app user'. My ListView is working fine, I just want to add this feature in.
So, for example, for the number 11111 I would have in my ListView :
Joe Blogs - app user
11111
Here's my code:
JSONArray jsonArrayContacts = response;
//response is something like [{"contact_phonenumber":"11111"}, etc...]
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new_contact);
//selectPhoneContacts is an empty array list that will hold our SelectPhoneContact info
selectPhoneContacts = new ArrayList<SelectPhoneContact>();
listView = (ListView) findViewById(R.id.listviewPhoneContacts);
}
//******for the phone contacts in the listview
// Load data in background
class LoadContact extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected Void doInBackground(Void... voids) {
// we want to delete the old selectContacts from the listview when the Activity loads
// because it may need to be updated and we want the user to see the updated listview,
// like if the user adds new names and numbers to their phone contacts.
selectPhoneContacts.clear();
// we have this here to avoid cursor errors
if (cursor != null) {
cursor.moveToFirst();
}
try {
// get a handle on the Content Resolver, so we can query the provider,
cursor = getApplicationContext().getContentResolver()
// the table to query
.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null,
null,
null,
// display in ascending order
ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME + " COLLATE LOCALIZED ASC");
// get the column number of the Contact_ID column, make it an integer.
// I think having it stored as a number makes for faster operations later on.
// get the column number of the DISPLAY_NAME column
int nameIdx = cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME);
// get the column number of the NUMBER column
int phoneNumberofContactIdx = cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER);
cursor.moveToFirst();
// We make a new Hashset to hold all our contact_ids, including duplicates, if they come up
Set<String> ids = new HashSet<>();
do {
System.out.println("=====>in while");
// get a handle on the display name, which is a string
name = cursor.getString(nameIdx);
// get a handle on the phone number, which is a string
phoneNumberofContact = cursor.getString(phoneNumberofContactIdx);
//----------------------------------------------------------
// get a handle on the phone number of contact, which is a string. Loop through all the phone numbers
// if our Hashset doesn't already contain the phone number string,
// then add it to the hashset
if (!ids.contains(phoneNumberofContact)) {
ids.add(phoneNumberofContact);
SelectPhoneContact selectContact = new SelectPhoneContact();
selectContact.setName(name);
selectContact.setPhone(phoneNumberofContact);
selectPhoneContacts.add(selectContact);
}
} while (cursor.moveToNext());
} catch (Exception e) {
Toast.makeText(NewContact.this, "what the...", Toast.LENGTH_LONG).show();
e.printStackTrace();
// cursor.close();
} finally {
}
if (cursor != null) {
cursor.close();
}
return null;
}
#Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
adapter = new SelectPhoneContactAdapter(selectPhoneContacts, NewContact.this);
// we need to notify the listview that changes may have been made on
// the background thread, doInBackground, like adding or deleting contacts,
// and these changes need to be reflected visibly in the listview. It works
// in conjunction with selectContacts.clear()
adapter.notifyDataSetChanged();
listView.setAdapter(adapter);
}
}
In the first, you can parse the jsonArrayContacts to a List:
final List<String> responseContacts = new ArrayList<String>();
try {
JSONArray responseObject = new JSONArray(response);
for (int i = 0; i < responseObject.length(); i++) {
final JSONObject obj = responseObject.getJSONObject(i);
responseContacts.add(obj.getString("contact_phonenumber"));
}
// System.out.println("the matching contacts of this user are :" + responseContacts);
} catch(Exception e) {
e.printStackTrace();
}
after you get your local contacts, then you have two sets of contacts, so it's easy to check which number appears in your json array contacts.
And then you can pass the responseContacts into SelectPhoneContactAdapter during you initialize it, and in getView() method of the adapter, you can know whether you need to put the words '- app user' to your item view or not.
Ok, I've got this Retrofit Call that receives a list of objects and insert the into a local SQLite database. I want to display a message saying that the operation was successful with a Ok button that when pressed opens a new activity.
How do I check if my Query has finished so I can show the message?
final ContactApi contactApi = retrofit.create(ContactApi.class);
Call<List<Contact>> callContact = contactApi.getContact(token);
callContact.enqueue(new Callback<List<Contact>>() {
#Override
public void onResponse(Response<List<Contact>> response, Retrofit retrofit) {
List<Contact> contactList = response.body();
if (contactList != null) {
try {
DBHelper dbHelper = new DBHelper(TokenActivity.this, token);
SQLiteDatabase conn = dbHelper.getWritableDatabase();
RepoContact repocontact = new RepoContact(conn);
// Inserts each contact into the database
for (Contatc c : contactList) {
repositorioCadastro.inserirCadastro(c);
Log.i("ACTTOKEN", "Contact insert ID: " + c.getId());
}
} catch (SQLiteException e) {
Log.i("ACTTOKEN", "Faillure on insert: " + e.getMessage());
}
}
wrap your code in try{...}finally{...} blocks with a listener ( beginTransactionWithListener(SQLiteTransactionListener transactionListener)), and use the transactionListner to check whether everything went well within the transaction, in addition to everything within the try/finally.
what you have is good, just try adding finally block..
something like this..
db.beginTransaction();
try {
...
db.setTransactionSuccessful();
} finally {
db.endTransaction();
}
You can try a different loop, something like this:
for(int i = 0; i < contactList.size(); i++) {
Contact c = contactList.get(i);
repositorioCadastro.inserirCadastro(c);
Log.i("ACTTOKEN", "Contact insert ID: " + c.getId());
if(i == (contactList.size() - 1)) {
// DO SOMETHING HERE
}
}
You may check insert statement return a long when query successfully executed then long value.
db.insert()
returns the row ID of the newly inserted row, or -1 if an error occurred
Here My update database table methods
public void insertionchallanval(ArrayList<String> itemcode,ArrayList<String> item,ArrayList<String> quantity,
ArrayList<String> date,ArrayList<String> status,ArrayList<String> id)
{
ContentValues insertValues = new ContentValues();
for(int i=0;i<status.size();i++)
{
if(!retriveidstatus(id.get(i)))
{
insertValues.put("id", id.get(i));
insertValues.put("itemcode", itemcode.get(i));
insertValues.put("item", item.get(i));
insertValues.put("status", status.get(i));
insertValues.put("date", date.get(i));
insertValues.put("quantity", quantity.get(i));
//insertValues.put("category", category.get(i));
myDataBase.insert("create_challan", null, insertValues);
}
else
{
insertValues.put("id", id.get(i));
insertValues.put("itemcode", itemcode.get(i));
insertValues.put("item", item.get(i));
insertValues.put("quantity", quantity.get(i));
insertValues.put("status", status.get(i));
insertValues.put("date", date.get(i));
//insertValues.put("category", category.get(i));
myDataBase.update("create_challan", insertValues, "id="+"'"+id.get(i)+"'",null );
}
}
}
Here my check Id Methods
public boolean retriveidstatus(String id)
{
Cursor curCalllog = myDataBase.rawQuery("SELECT id FROM create_challan", null);
if(curCalllog.moveToNext() && curCalllog != null) {
while(!curCalllog.isAfterLast())
{
if(id.contains(curCalllog.getString(0)))
{
return true;
}
curCalllog.moveToNext();
}
}
return false;
}
Table Structure
id String
status String
date String
challanno String
itemcode String
item String
quantity String
When i call methods for insertion new value then its working fine but when i call again with new updated value then update methods return 0 means no row effected
Please Help me how i can fix this problem
Thanks IN Advance
Instead of checking wether the _IDs exist or not you can use replace() method of the class SQLiteDatabase like this :
myDataBase.replace("create_challan", null, insertValues);
hope it helps Cheers :)
I'm trying to save user information in my application. I have Employee number editText and Company EditText. My employee number is not a required field so that means my table can have null values. My problem is when I am comparing if the employee number entered by the user already exist in my database, it also reads the null values when the user do not enter anything on the employee number editText. Can anyone help me do this please?
This is my code where I save all the employee number in an arraylist and remove all the null values
ArrayList<String> employeenumber = databaseAdapter.getEmployeeNumber();
employeenumber.removeAll(Collections.singleton(null));
employeenumber.removeAll(Collections.singleton(""));
What I wanna do is, if the user enter employee number, it will check if the arraylist contains it and if yes, it will all check the company corresponds to it. I need to trap duplicate entry. For example the employee number is 1234 and the company is ABCD, the program must not accept it. Thanks for anyone who could help me.
First check whether the user enter something on employee number editText. Then use int flag to compare it. Try the code below in your main activity:
int flag1 = 0;
if (!Emp.equals(""))
{
ArrayList<String> CompanyandEmp = new ArrayList<String>();
CompanyandEmp = databaseAdapter.getCompanyEmp(Emp);
CompanyandEmp.removeAll(Collections.singleton(""));
for(int i=0;i< CompanyandEmp.size();i++)
{
String cmpemp = CompanyandEmp.get(i).toString();
if(cmpemp.equalsIgnoreCase(companyName))
{
flag1 = 1;
}
}
}
if (flag1 == 0)
{
//as per your requirement
}else{
Toast.makeText(RegistrationActivity.this, "Account info already exist.", Toast.LENGTH_LONG).show();
}
Then in your databaseAdapter:
public ArrayList<String> getCompanyEmp(String emp) {
SQLiteDatabase db = this.getReadableDatabase();
ArrayList<String> companyemp = new ArrayList<String>();
try {
Cursor c = db.query("select CompName FROM projsitemast where Emp='"+emp+"'", null);
if (c != null) {
c.moveToFirst();
for (int j = 0; j < c.getCount(); j++) {
companyemp.add(c.getString(0));
c.moveToNext();
}
c.close();
}
return companyemp;
} catch (Exception e) {
e.printStackTrace();
}
return companyemp;
}
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.