Develop Reference

Store SQLite query result in a String array

How can I save a query result in a String array?
The query is simple, it's got only one column i.e.:
SELECT NAME FROM MYTABLE
What I want is to store the ids in a String array so I can show them as clickable items in a ListView

Try this
String selectQuery = "SELECT * FROM table";
try {
Cursor cursor = db.rawQuery(selectQuery, null);
ArrayList<String> ids = new ArrayList<>();
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
String id = cursor.getString(cursor.getColumnIndex(KEY_ID));
ids.add(id);
} while (cursor.moveToNext());
}
cursor.close();
} catch (Exception e) {
e.printStackTrace();
}

Assuming you've already executed your query against a SQLiteDatabase object, and received a Cursor in return, you can iterate through the cursor and save the value of each row to a String[] array like so:
String[] names;
if (cursor.moveToFirst()) {
names = new String[cursor.getCount()];
int colIndex = cursor.getColumnIndex("NAME");
do {
names[cursor.getPosition()] = cursor.getString(colIndex);
} while (cursor.moveToNext());
}
Keep in mind that names will be null if no rows are returned, so make sure you do a null check.

create following method in SQLiteOpenHelper class
public List<String> getAllNames() {
List<String> retData = new ArrayList<String>();
String selectQuery = "SELECT NAME FROM MYTABLE";
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
retData.add(cursor.getString(0));
} while (cursor.moveToNext());
}
return retData;
}
then assign this returned list to adapter

The issue with listing id's is that they tend to be meaningless to an end user. Really you want to display user meaningful data, e.g. a name, but to then be able to access the respective id to then efficiently act on a selection from the list presented to a user.
Using an ArrayList is frequently the cause of much frustration, as the list shows what is required but it's then found to be of little use when attempting to use the list beyond displaying data e.g. selecting an item to then do something such as delete or update (if the value is unique within the database it can be used).
As such an ArrayList<your_object> rather then an ArrayList<String> is generally more viable as the source of the List; a Cursor Adapter can also be used as data from the underlying row is easily obtained.
However, there is an issue, unless a Custom Array Adapter is utilised, when using an ArrayList in that the ArrayAdapter class uses the toString method of the object to retrieve the data that is displayed. The simple fix is to provide a suitable toString method in the object, if you don't you will get something long the lines of “SomeType#2f92e0f4”.
Example showing all 3
In the following working example :-
the database (mydb) has 1 table named mytable which has two columns _id (Note must be _id for a CursorAdapter)
There are 3 methods to get the 3 types of list (named accordingly) :-
getAllAsStringArrayList (gets ArrayList)
getAllAsMyTableObjectArrayList (gets ArrayList). Note uses the MyTableObject class (see note in class re overriding the default toString method)
getAllAsCursor
The App, when run, will have 3 lists, the left based upon the first ArrayList, the middle based upon the ArrayList and the last based upon the Cursor.
Clicking an item in any of the lists displays the respective name along with attempts to get the id.
The ArrayList, Left List, fails in this aspect as it can only get the position (i.e. the 4th parameter passed to the listener is the same value as the position).
The ArrayList, middle List, when getting the id from the object (which is retrieved via the getItem(position) method of the Adapter) successfully retrieves the correct id, the 4th parameter is the same as the position, and should not be used.
The Cursor, Right List, retrieves the correct id both via the Cursor and the 4th parameter.
The Code
MyTableObject.java :-
public class MyTableObject {
private long id;
private String name;
public MyTableObject(long id, String name) {
this.id = id;
this.name = name;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
/*
NOTE toString method returns just the name
*/
#Override
public String toString() {
return name;
}
}
DatabaseHelper.java :-
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DBNAME = "mydb";
public static final int DBVERSION = 1;
public static final String TB_MYTABLE = "mytable";
public static final String COl_MYTABLE_ID = BaseColumns._ID; //<<<< use standard android id column name
public static final String COL_MYTABLE_NAME = "_name";
private static final String mytable_crtsql =
"CREATE TABLE IF NOT EXISTS " + TB_MYTABLE +
"(" +
COl_MYTABLE_ID + " INTEGER PRIMARY KEY, " +
COL_MYTABLE_NAME + " TEXT " +
")";
SQLiteDatabase mDB;
public DatabaseHelper(Context context) {
super(context, DBNAME, null, DBVERSION);
mDB = this.getWritableDatabase();
}
#Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(mytable_crtsql);
}
#Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {
}
public long addRow(String name) {
ContentValues cv = new ContentValues();
cv.put(COL_MYTABLE_NAME,name);
return mDB.insert(TB_MYTABLE,null,cv);
}
public ArrayList<String> getAllAsStringArrayList() {
ArrayList<String> rv = new ArrayList<>();
Cursor csr = mDB.query(
TB_MYTABLE,
null,
null,
null,
null,
null,
null
);
while (csr.moveToNext()) {
rv.add(csr.getString(csr.getColumnIndex(COL_MYTABLE_NAME)));
}
csr.close();
return rv;
}
public ArrayList<MyTableObject> getAllAsMyTableObjectArrayList() {
ArrayList<MyTableObject> rv = new ArrayList<>();
Cursor csr = mDB.query(
TB_MYTABLE,
null,
null,
null,
null,
null,
null
);
while (csr.moveToNext()) {
rv.add(new MyTableObject(
csr.getLong(csr.getColumnIndex(COl_MYTABLE_ID)),
csr.getString(csr.getColumnIndex(COL_MYTABLE_NAME))
)
);
}
csr.close();
return rv;
}
public Cursor getAllAsCursor() {
return mDB.query(
TB_MYTABLE,
null,
null,
null,
null,
null,
null
);
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity {
DatabaseHelper mDBHlpr;
ListView mListView01,mListVeiw02,mListView03;
ArrayAdapter<String> mAdapterStringArrayList;
ArrayAdapter<MyTableObject> mAdapterMyTableObjectArrayList;
SimpleCursorAdapter mAdapterCursor;
ArrayList<String> mMyTableListAsStrings;
ArrayList<MyTableObject> mMyTableAsObjects;
Cursor mMyTableListAsCursor;
Context mContext;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mContext = this;
mListView01 = this.findViewById(R.id.listview01);
mListVeiw02 = this.findViewById(R.id.listview02);
mListView03 = this.findViewById(R.id.listview03);
mDBHlpr = new DatabaseHelper(this);
mDBHlpr.addRow("Fred");
mDBHlpr.addRow("Bert");
mDBHlpr.addRow("Harry");
mDBHlpr.addRow("Fred");
//String Array List
mMyTableListAsStrings = mDBHlpr.getAllAsStringArrayList();
mAdapterStringArrayList = new ArrayAdapter<>(
this,
android.R.layout.simple_list_item_1,
mMyTableListAsStrings
);
mListView01.setAdapter(mAdapterStringArrayList);
//Object Array List
mMyTableAsObjects = mDBHlpr.getAllAsMyTableObjectArrayList();
mAdapterMyTableObjectArrayList = new ArrayAdapter<>(
this,
android.R.layout.simple_list_item_1,
mMyTableAsObjects
);
mListVeiw02.setAdapter(mAdapterMyTableObjectArrayList);
// Cursor
mMyTableListAsCursor = mDBHlpr.getAllAsCursor();
mAdapterCursor = new SimpleCursorAdapter(
this,
android.R.layout.simple_list_item_1,
mMyTableListAsCursor,
new String[]{DatabaseHelper.COL_MYTABLE_NAME},
new int[]{android.R.id.text1},
0
);
mListView03.setAdapter(mAdapterCursor);
mListView01.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
String name = mAdapterStringArrayList.getItem(position);
Toast.makeText(
mContext,
"Name is " + name +
". ID is " + String.valueOf(id) +
" (note may not match)",
Toast.LENGTH_SHORT
).show();
}
});
mListVeiw02.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
MyTableObject mytable = mAdapterMyTableObjectArrayList.getItem(position);
String name = mytable.getName();
long id_in_object = mytable.getId();
Toast.makeText(
mContext,
"Name is " + name +
". ID from object is " + String.valueOf(id_in_object) +
". ID from adapter is " + String.valueOf(id),
Toast.LENGTH_SHORT
).show();
}
});
mListView03.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
Cursor csr = mAdapterCursor.getCursor(); // already positioned
String name = csr.getString(csr.getColumnIndex(DatabaseHelper.COL_MYTABLE_NAME));
long id_in_cursor = csr.getLong(csr.getColumnIndex(DatabaseHelper.COl_MYTABLE_ID));
Toast.makeText(
mContext,
"Name is " + name +
". ID from object is " + String.valueOf(id_in_cursor) +
". ID from adapter is " + String.valueOf(id),
Toast.LENGTH_SHORT
).show();
}
});
}
}

How to make a checkbox from information found in DataBase?

I have a table in DataBase, and I want to make a table.
Now it makes no sense that I will do a lot of CheckBox and show you only some of them according to the information in the table. I heard about the listview
But how do I do listview of checkbox I found an example of listview on the Internet and when I tried to insert large information, only half the information came in, so I was told to do adapter.
Do you have an example of how to do this?
It DatabaseHandler:
package budgetreport.com.budgetreport;
public class DatabaseHandler extends SQLiteOpenHelper {
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 4;
// Database Name
private static final String DATABASE_NAME = "Records_Item Purcashes";
// Contacts table name
private static final String TABLE_RECORDS = "Records";
// Contacts Table Columns names
private static final String KEY_ID = "ID";
private static final String KEY_PRICE = "Price";
private static final String KEY_ITEM = "Item";
private static final String KEY_DETAILS = "Details";
private static final String KEY_DATE = "Date";
public DatabaseHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Creating Tables
#Override
public void onCreate(SQLiteDatabase db) {
String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_RECORDS + "("
+ KEY_ID + " INTEGER PRIMARY KEY,"
+ KEY_PRICE + " INTEGER," + KEY_ITEM + " TEXT,"
+ KEY_DETAILS + " TEXT, " + KEY_DATE + " TEXT" + ")";
db.execSQL(CREATE_CONTACTS_TABLE);
}
// Upgrading database
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_RECORDS);
// Create tables again
onCreate(db);
}
// Adding new contact
public void addRecord(Record record) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_ID, record.getId()); // Contact Name
values.put(KEY_PRICE, record.getPrice()); // Contact Name
values.put(KEY_ITEM, record.getItem()); // Contact Name
values.put(KEY_DETAILS, record.getDetails()); // Contact Name
values.put(KEY_DATE, record.getDetails()); // Contact Phone Number
// Inserting Row
db.insert(TABLE_RECORDS, null, values);
db.close(); // Closing database connection
}
// Getting single contact
public Record getRecord(int id) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_RECORDS, new String[] { KEY_ID, KEY_PRICE,
KEY_ITEM, KEY_DETAILS, KEY_DATE }, KEY_ID + "=?",
new String[] { String.valueOf(id) }, null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
Record record = new Record(Integer.parseInt(cursor.getString(0)),
Integer.parseInt(cursor.getString(1)), cursor.getString(2), cursor.getString(3), cursor.getString(4));
// return contact
return record;
}
// Getting All Contacts
public List<Record> getAllContacts() {
List<Record> contactList = new ArrayList<Record>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_RECORDS;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Record record = new Record();
record.setId(Integer.parseInt(cursor.getString(0)));
record.setPrice(Integer.parseInt(cursor.getString(1)));
record.setItem(cursor.getString(2));
record.setDetails(cursor.getString(3));
record.setDate(cursor.getString(4));
// Adding contact to list
contactList.add(record);
} while (cursor.moveToNext());
}
// return contact list
return contactList;
}
// Getting contacts Count
public int getRecordsCount() {
String countQuery = "SELECT * FROM " + TABLE_RECORDS;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
// cursor.close();
// return count
return cursor.getCount();
}
// Updating single contact
public int updateContact(Record record) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_ID, record.getId());
values.put(KEY_PRICE, record.getPrice());
values.put(KEY_DETAILS, record.getDetails());
values.put(KEY_DATE, record.getDate());
// updating row
return db.update(TABLE_RECORDS, values, KEY_ID + " = ?",
new String[] { String.valueOf(record.getPrice()) });
}
// Deleting single contact
public void deleteContact(Record record) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_RECORDS, KEY_ID + " = ?",new String[]
{String.valueOf(record.getPrice()) });
db.close();
}
}

Deletion of checked Items as per I want to erase the lines I have marked.
This is relatively simple to progress to.
It involves
- a) adding a method to the database helper to delete according to id.
- b) (i)amend the onClick listener to invoke the delete method (simple loop) and to then (ii)update the listview (after the loop).
However, the original custom adapter has some flaws in that the original cursor is retained via mCsr and no consideration was given to the number of checkboxes being changed when the Cursor is changed (swapped).
As such the adapter has had references to mCsr removed and replaced by the Cursor passed or via calling the getCursor method. Also the swapCursor() method has been overidden to adjust the number of elements of and re-initialise the elemnets (set to false), of mCheckBoxes.
a) The new deleteRecord method :-
public boolean deleteRecord(long id) {
SQLiteDatabase db = this.getWritableDatabase();
return (db.delete(TABLE_RECORDS,KEY_ID + "=?",new String[]{Long.toString(id)})> 0);
}
b)(i) onCLickListener amendments (note includes grouping all deletes into a single transaction) :-
// <<<<< DO IT BUTTON HANDLER i.e. get list of ID's for checked items
mDoItButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// get the ID's for the checked Items
mCheckedIdList = mMCA.getCheckedRecordIdList();
Toast.makeText(mContext,"You have " + mCheckedIdList.length + " Items checked.",Toast.LENGTH_SHORT).show();
//<<<< to delete
SQLiteDatabase db = mDBHandler.getWritableDatabase();
db.beginTransaction();
for (long id: mCheckedIdList) {
mDBHandler.deleteRecord(id);
}
db.setTransactionSuccessful();
db.endTransaction();
refreshListView();
}
});
b(ii) Update the Listview (new method in the Activity) :-
private void refreshListView() {
mCsr = mDBHandler.getAllRecords();
mMCA.swapCursor(mCsr);
}
Notes
this is added as a method to the activity.
mMCA.notifyDatasetChanged(); is an alternative (I personally prefer `swapCursor1 as it's more decsriptive).
The modified Custom Cursor Adapter should be :-
public class MyCustomCursorAdapter extends CursorAdapter {
private Context mContext;
private String[] mColumns;
private int[] mViews;
private int mLayout;
private boolean[] mCheckBoxStates;
private int mCheckBoxView;
// Constructor for the Custom Cursor Adapter
MyCustomCursorAdapter(Context context, int layout, Cursor csr, String[] from_columns, int[] to_views, int checkbox_view) {
super(context,csr, false);
mContext = context;
mLayout = layout;
mColumns = from_columns;
mViews = to_views;
mCheckBoxView = checkbox_view;
}
#Override
// Inflate the layout we are going to use (as passed via 2nd parameter)
public View newView(Context context, Cursor csr, ViewGroup parent) {
// Initialise an int array for the checkboxes (all will be 0)
mCheckBoxStates = new boolean[csr.getCount()];
return LayoutInflater.from(context).inflate(mLayout,parent,false);
}
#Override
// Tie the from_columns to the display views
public void bindView(View view, Context context, Cursor csr) {
final Cursor fcsr = csr;
// Place the data from the cursor into the respective View (TextView)
for (int i = 0; i < mColumns.length; i++) {
((TextView) view.findViewById(mViews[i])).setText(csr.getString(csr.getColumnIndex(mColumns[i])));
}
// Set the checkbox (note should be false, unless otherwise changed)
CheckBox currentCheckBox = (CheckBox) view.findViewById(mCheckBoxView);
currentCheckBox.setChecked(mCheckBoxStates[csr.getPosition()]);
currentCheckBox.setTag(new Long(csr.getLong(csr.getColumnIndex(DatabaseHandler.KEY_ID))));
//
currentCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
final int position = fcsr.getPosition();
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// Store the checkbox status
mCheckBoxStates[position] = ((CheckBox) buttonView).isChecked();
int restore_cursor_position = fcsr.getPosition();
//Move the Cursor to the respective row
//NOTE! 1st position in Lisview is 1 but equates to cursor row 0 etc hence -1
fcsr.moveToPosition(position);
Toast.makeText(mContext,
"You Changed the CheckBox for row " +
Integer.toString(position + 1) +
" Item is " +
fcsr.getString(fcsr.getColumnIndex(DatabaseHandler.KEY_ITEM))
,
Toast.LENGTH_SHORT
).show();
//restore the Cursor's position
fcsr.moveToPosition(restore_cursor_position);
}
});
}
// get the list of items (the ID's as long) that have been checked.
public long[] getCheckedRecordIdList() {
Cursor csr = this.getCursor();
// using ArrayList as we can add as we don't yet know how many
ArrayList<Long> rva = new ArrayList<>();
// Just in case save the current position of the Cursor
int restore_cursor_position = csr.getPosition();
// Loop through the checkbox states
for (int i=0; i < mCheckBoxStates.length; i++) {
// If the checkbox reflected as being checked then handle, else ignore it
if (mCheckBoxStates[i]) {
// Move to the respective cursor row
csr.moveToPosition(i);
// get the respective ID and store in the arraylist
rva.add(csr.getLong(csr.getColumnIndex(DatabaseHandler.KEY_ID)));
}
}
// Done with the Cursor so re-position it
csr.moveToPosition(restore_cursor_position);
// Create the long array to be returned
long[] rv = new long[rva.size()];
// Populate the long array with the id's from the arraylist
for (int i=0; i < rva.size(); i++) {
rv[i] = rva.get(i);
}
// return the long[]
return rv;
}
#Override
public Cursor swapCursor(Cursor csr) {
mCheckBoxStates = new boolean[csr.getCount()];
for (int i=0; i < mCheckBoxStates.length; i++) {
mCheckBoxStates[i] = false;
}
return super.swapCursor(csr);
}
}

here's an example based upon you code.
1) The Activity's layout (i.e a ListView with an id of lv001) as file activity_main.xml :-
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="mjt.budgetreport.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
android:layout_margin="10dp"
/>
<ListView
android:id="#+id/lv001"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</ListView>
</LinearLayout>
2) A layout for each row (Item in ListView terminology) as file listviewitem_record.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/record_price"
android:layout_width="0dp"
android:layout_weight="8"
android:layout_height="wrap_content"
android:layout_margin="5dp"/>
<TextView
android:id="#+id/record_item"
android:layout_width="0dp"
android:layout_weight="10"
android:layout_height="wrap_content"
android:layout_margin="5dp"/>
<TextView
android:id="#+id/record_details"
android:layout_width="0dp"
android:layout_weight="20"
android:layout_height="wrap_content"
android:layout_margin="5dp"/>
<TextView
android:id="#+id/record_date"
android:layout_width="0dp"
android:layout_weight="10"
android:layout_height="wrap_content"
android:layout_margin="5dp"/>
<CheckBox
android:id="#+id/record_checkbox"
android:layout_width="0dp"
android:layout_weight="2"
android:layout_height="wrap_content"
android:layout_margin="5dp"/>
</LinearLayout>
Note! the inclusion of a CheckBox, as well as TextViews for all columns.
3) To simplify matters I used this as DatabaseHandler.java :-
public class DatabaseHandler extends SQLiteOpenHelper {
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 4;
// Database Name
public static final String DATABASE_NAME = "Records_Item Purcashes";
// Contacts table name
public static final String TABLE_RECORDS = "Records";
// Contacts Table Columns names
public static final String KEY_ID = "_id";
public static final String KEY_PRICE = "Price";
public static final String KEY_ITEM = "Item";
public static final String KEY_DETAILS = "Details";
public static final String KEY_DATE = "Date";
public DatabaseHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Creating Tables
#Override
public void onCreate(SQLiteDatabase db) {
String CREATE_CONTACTS_TABLE = "CREATE TABLE " +
TABLE_RECORDS +
"(" +
KEY_ID + " INTEGER PRIMARY KEY," +
KEY_PRICE + " INTEGER," +
KEY_ITEM + " TEXT," +
KEY_DETAILS + " TEXT, " +
KEY_DATE + " TEXT" +
")";
db.execSQL(CREATE_CONTACTS_TABLE);
}
// Upgrading database
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_RECORDS);
// Create tables again
onCreate(db);
}
public void insertRecord(int price, String item, String details, String date) {
ContentValues cv = new ContentValues();
cv.put(KEY_PRICE,price);
cv.put(KEY_ITEM,item);
cv.put(KEY_DETAILS,details);
cv.put(KEY_DATE,date);
SQLiteDatabase db = this.getWritableDatabase();
db.insert(TABLE_RECORDS,null,cv);
}
public Cursor getAllRecords() {
SQLiteDatabase db = this.getWritableDatabase();
return db.query(TABLE_RECORDS,null,null,null,null,null,null);
}
/*
// Adding new contact
public void addRecord(AlphabeticIndex.Record record) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_ID, record.getId()); // Contact Name
values.put(KEY_PRICE, record.getPrice()); // Contact Name
values.put(KEY_ITEM, record.getItem()); // Contact Name
values.put(KEY_DETAILS, record.getDetails()); // Contact Name
values.put(KEY_DATE, record.getDetails()); // Contact Phone Number
// Inserting Row
db.insert(TABLE_RECORDS, null, values);
db.close(); // Closing database connection
}
*/
/*
// Getting single contact
public AlphabeticIndex.Record getRecord(int id) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_RECORDS, new String[] { KEY_ID, KEY_PRICE,
KEY_ITEM, KEY_DETAILS, KEY_DATE }, KEY_ID + "=?",
new String[] { String.valueOf(id) }, null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
AlphabeticIndex.Record record = new AlphabeticIndex.Record(Integer.parseInt(cursor.getString(0)),
Integer.parseInt(cursor.getString(1)), cursor.getString(2), cursor.getString(3), cursor.getString(4));
// return contact
return record;
}
*/
/*
// Getting All Contacts
public List<AlphabeticIndex.Record> getAllContacts() {
List<AlphabeticIndex.Record> contactList = new ArrayList<AlphabeticIndex.Record>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_RECORDS;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
AlphabeticIndex.Record record = new AlphabeticIndex.Record();
record.setId(Integer.parseInt(cursor.getString(0)));
record.setPrice(Integer.parseInt(cursor.getString(1)));
record.setItem(cursor.getString(2));
record.setDetails(cursor.getString(3));
record.setDate(cursor.getString(4));
// Adding contact to list
contactList.add(record);
} while (cursor.moveToNext());
}
// return contact list
return contactList;
}
*/
/*
// Getting contacts Count
public int getRecordsCount() {
String countQuery = "SELECT * FROM " + TABLE_RECORDS;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
// cursor.close();
// return count
return cursor.getCount();
}
*/
/*
// Updating single contact
public int updateContact(AlphabeticIndex.Record record) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_ID, record.getId());
values.put(KEY_PRICE, record.getPrice());
values.put(KEY_DETAILS, record.getDetails());
values.put(KEY_DATE, record.getDate());
// updating row
return db.update(TABLE_RECORDS, values, KEY_ID + " = ?",
new String[] { String.valueOf(record.getPrice()) });
}
*/
/*
// Deleting single contact
public void deleteContact(AlphabeticIndex.Record record) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_RECORDS, KEY_ID + " = ?",new String[]
{String.valueOf(record.getPrice()) });
db.close();
}
*/
}
Notes about Changes to DatabaseHandler.java
The rowid alias has been changed from ID to _id, this is because CursorAdapter's need a column named _id and that column should be an alias for for the rowid (not going into technicalities here).
Instead of using a Record class I've commented out your code that uses this class, for my convenience.
I've changed TABLE and COLUMN names definitions to public, so they can be accessed elsewhere.
I've added two new methods insertRecord and getAllRecords:-
insertRecord just to add some data for testing/example
getAllRecords retrieves all rows as a Cursor, as opposed to an array.
NOTE! The database is not closed, this would result in an exception because a Cursor needs access to the database (opening and closing a database can be detrimental anyway).
4) The Activity itself (just displays the ListView after adding some data for the first run) as file MainActivity.java :-
public class MainActivity extends AppCompatActivity {
DatabaseHandler mDBHandler;
ListView mListView;
SimpleCursorAdapter mSCA;
Cursor mCsr;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mListView = (ListView) this.findViewById(R.id.lv001); // Get the ListView from it's id
mDBHandler = new DatabaseHandler(this); // Get an instance of the Database Handler
// Add some data but only if there is no data
if (DatabaseUtils.queryNumEntries(mDBHandler.getWritableDatabase(),DatabaseHandler.TABLE_RECORDS) < 1) {
mDBHandler.insertRecord(100,"Rock","A large stone.","31/12/2017");
mDBHandler.insertRecord(50,"Boulder","A Rock.","31/12/2018");
mDBHandler.insertRecord(322,"Soil","Loose earth.","31/7/2015");
mDBHandler.insertRecord(237,"Stone","A small rock.","31/8/2014");
mDBHandler.insertRecord(32,"Pebble","A small smooth stone.","11/12/2017");
}
// get all rows into a Cursor
mCsr = mDBHandler.getAllRecords();
// Prepare a list of the columns to get the data from, for the ListViewt
String[] columns_to_get_data_from = new String[]{
DatabaseHandler.KEY_PRICE,
DatabaseHandler.KEY_ITEM,
DatabaseHandler.KEY_DETAILS,
DatabaseHandler.KEY_DATE
};
// Prepare a list of the Views into which to place the data
int[] itemviews_to_place_data_in = new int[]{
R.id.record_price,
R.id.record_item,
R.id.record_details,
R.id.record_date
};
// get and instance of SimpleCursorAdapter
mSCA = new SimpleCursorAdapter(this,
R.layout.listviewitem_record,
mCsr,
columns_to_get_data_from,
itemviews_to_place_data_in,
0);
// get and instance of SimpleCursorAdapter the listviewitem_record layout
mListView.setAdapter(mSCA);
}
}
Result :-
Notes
This doesn't go into handling the checkboxes, this would likely need a CustomAdapter. There's plenty of tutorials for that e.g. how do i create a custom cursor adapter for a listview for use with images and text?.
Edit Amended to Include CheckBox handling
1) The Activity's layout activity_main.xml - Added a Button for getting Checked Items :-
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="mjt.budgetreport.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
android:layout_margin="10dp"
/>
<Button
android:id="#+id/doitbutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="DO ALL CHECKED ROWS"
/>
<ListView
android:id="#+id/lv001"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</ListView>
</LinearLayout>
2) The Custom Cursor Adapter MyCustomCursorAdapter.java
Signature similar to SimpleCursorAdapter BUT with an extra parameter for the id of the CheckBox.
Includes method getCheckedRecordIdList, which will return a list of Id's that have been checked.
Issues a Toast when a checkbox is checked or unchecked which displays the item, as in the ListView's Item # (not the Item in the table), clicked and the Item clicked (as in the Item value from the table).
:-
public class MyCustomCursorAdapter extends CursorAdapter {
private Context mContext;
private Cursor mCsr;
private String[] mColumns;
private int[] mViews;
private int mLayout;
private boolean[] mCheckBoxStates;
private int mCheckBoxView;
// Constructor for the Custom Cursor Adapter
MyCustomCursorAdapter(Context context, int layout, Cursor csr, String[] from_columns, int[] to_views, int checkbox_view) {
super(context,csr, false);
mContext = context;
mLayout = layout;
mCsr = csr;
mColumns = from_columns;
mViews = to_views;
mCheckBoxView = checkbox_view;
}
#Override
// Inflate the layout we are going to use (as passed via 2nd parameter)
public View newView(Context context, Cursor csr, ViewGroup parent) {
// Initialise an int array for the checkboxes (all will be 0)
mCheckBoxStates = new boolean[csr.getCount()];
return LayoutInflater.from(context).inflate(mLayout,parent,false);
}
#Override
// Tie the from_columns to the display views
public void bindView(View view, Context context, Cursor csr) {
// Place the data from the cursor into the respective View (TextView)
for (int i = 0; i < mColumns.length; i++) {
((TextView) view.findViewById(mViews[i])).setText(csr.getString(csr.getColumnIndex(mColumns[i])));
}
// Set the checkbox (note should be false, unless otherwise changed)
CheckBox currentCheckBox = (CheckBox) view.findViewById(mCheckBoxView);
currentCheckBox.setChecked(mCheckBoxStates[mCsr.getPosition()]);
currentCheckBox.setTag(new Long(mCsr.getLong(mCsr.getColumnIndex(DatabaseHandler.KEY_ID))));
//
currentCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
final int position = mCsr.getPosition();
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// Store the checkbox status
mCheckBoxStates[position] = ((CheckBox) buttonView).isChecked();
int restore_cursor_position = mCsr.getPosition();
//Move the Cursor to the respective row
//NOTE! 1st position in Lisview is 1 but equates to cursor row 0 etc hence -1
mCsr.moveToPosition(position);
Toast.makeText(mContext,
"You Changed the CheckBox for row " +
Integer.toString(position + 1) +
" Item is " +
mCsr.getString(mCsr.getColumnIndex(DatabaseHandler.KEY_ITEM))
,
Toast.LENGTH_SHORT
).show();
//restore the Cursor's position
mCsr.moveToPosition(restore_cursor_position);
}
});
}
// get the list of items (the ID's as long) that have been checked.
public long[] getCheckedRecordIdList() {
// using ArrayList as we can add as we don't yet know how many
ArrayList<Long> rva = new ArrayList<>();
// Just in case save the current position of the Cursor
int restore_cursor_position = mCsr.getPosition();
// Loop through the checkbox states
for (int i=0; i < mCheckBoxStates.length; i++) {
// If the checkbox reflected as being checked then handle, else ignore it
if (mCheckBoxStates[i]) {
// Move to the respective cursor row
mCsr.moveToPosition(i);
// get the respective ID and store in the arraylist
rva.add(mCsr.getLong(mCsr.getColumnIndex(DatabaseHandler.KEY_ID)));
}
}
// Done with the Cursor so re-position it
mCsr.moveToPosition(restore_cursor_position);
// Create the long array to be returned
long[] rv = new long[rva.size()];
// Populate the long array with the id's from the arraylist
for (int i=0; i < rva.size(); i++) {
rv[i] = rva.get(i);
}
// return the long[]
return rv;
}
}
3) The amended MainActivity to use the Custom Adapter and to get the list of checked Records (displays number selected via Toast) - MainActivity.java
Changed/Added Lines/Methods are marked with <<<<<.
:-
public class MainActivity extends AppCompatActivity {
DatabaseHandler mDBHandler;
ListView mListView;
SimpleCursorAdapter mSCA;
MyCustomCursorAdapter mMCA; // <<<<<
Cursor mCsr;
Button mDoItButton;
Context mContext; //<<<<<
long[] mCheckedIdList; //<<<<<
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mContext = this;
mListView = (ListView) this.findViewById(R.id.lv001); // Get the ListView from it's id
mDoItButton = (Button) this.findViewById(R.id.doitbutton); //<<<<<
mDBHandler = new DatabaseHandler(this); // Get an instance of the Database Handler
// Add some data but only if there is no data
if (DatabaseUtils.queryNumEntries(mDBHandler.getWritableDatabase(),DatabaseHandler.TABLE_RECORDS) < 1) {
mDBHandler.insertRecord(100,"Rock","A large stone.","31/12/2017");
mDBHandler.insertRecord(50,"Boulder","A Rock.","31/12/2018");
mDBHandler.insertRecord(322,"Soil","Loose earth.","31/7/2015");
mDBHandler.insertRecord(237,"Stone","A small rock.","31/8/2014");
mDBHandler.insertRecord(32,"Pebble","A small smooth stone.","11/12/2017");
}
mDBHandler.increasePrice(1,213);
// get all rows into a Cursor
mCsr = mDBHandler.getAllRecords();
// Prepare a list of the columns to get the data from, for the ListViewt
String[] columns_to_get_data_from = new String[]{
DatabaseHandler.KEY_ID,
DatabaseHandler.KEY_PRICE,
DatabaseHandler.KEY_ITEM,
DatabaseHandler.KEY_DETAILS,
DatabaseHandler.KEY_DATE
};
// Prepare a list of the Views into which to place the data
int[] itemviews_to_place_data_in = new int[]{
R.id.record_id,
R.id.record_price,
R.id.record_item,
R.id.record_details,
R.id.record_date
};
// get and instance of SimpleCursorAdapter the listviewitem_record layout
mSCA = new SimpleCursorAdapter(this,
R.layout.listviewitem_record,
mCsr,
columns_to_get_data_from,
itemviews_to_place_data_in,
0);
// Tie the adapter to the Listview
mListView.setAdapter(mSCA);
// <<<<<< Alternate Custom Cursor Adapter
mMCA = new MyCustomCursorAdapter(this,
R.layout.listviewitem_record,
mCsr,
columns_to_get_data_from,
itemviews_to_place_data_in,
R.id.record_checkbox //<<<<<< id of the checkbox
);
// Hijack the Listview
mListView.setAdapter(mMCA); //<<<<<<
// <<<<< DO IT BUTTON HANDLER i.e. get list of ID's for checked items
mDoItButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// get the ID's for the checked Items
mCheckedIdList = mMCA.getCheckedRecordIdList();
Toast.makeText(mContext,"You have " + mCheckedIdList.length + " Items checked.",Toast.LENGTH_SHORT).show();
}
});
}
}
Note! you wouldn't typically have two adapters, but I left the SimpleCursorAdapter in for comparison.
Note! be a little patient, as if you click too much too soon you may get consfused.
Note! See other answer for deleting checked items.

Sqlite data don't show after close the apps

This is my MainActivity.
public class MainActivity extends Activity {
EditText etName, etEmail;
DatabaseHelper dbHelper;
Button save;
// declare view
ListView lvEmployees;
// declare adapter
CustomizedAdapter adapter;
// datasource
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
etName = (EditText) findViewById(R.id.etName);
etEmail = (EditText) findViewById(R.id.etEmail);
save = (Button) findViewById(R.id.btnSave);
lvEmployees = (ListView) findViewById(R.id.lvEmployees);
dbHelper = new DatabaseHelper(this);
save.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
save(v);
}
});
}
public void save(View v) {
String name = etName.getText().toString();
String email = etEmail.getText().toString();
Employee employee = new Employee(name, email);
Toast.makeText(getApplicationContext(), employee.toString(),
Toast.LENGTH_LONG).show();
long inserted = dbHelper.insertEmployee(employee);
if (inserted >= 0) {
Toast.makeText(getApplicationContext(), "Data inserted",
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(), "Data insertion failed...",
Toast.LENGTH_LONG).show();
}
ArrayList<Employee> employees = dbHelper.getAllEmployees();
if (employees != null && employees.size() > 0) {
adapter = new CustomizedAdapter(this, employees);
lvEmployees.setAdapter(adapter);
}
}
}
This is my DataBaseHelper.
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DB_NAME = "task_management";
public static final int DB_VERSION = 1;
public static final String EMPLOYEE_TABLE = "employee";
public static final String ID_FIELD = "_id";
public static final String NAME_FIELD = "name";
public static final String EMAIL_FIELD = "email";
public static final String EMPLOYEE_TABLE_SQL = "CREATE TABLE "
+ EMPLOYEE_TABLE + " (" + ID_FIELD + " INTEGER PRIMARY KEY, "
+ NAME_FIELD + " TEXT, " + EMAIL_FIELD + " DATETIME);";
public DatabaseHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
#Override
public void onCreate(SQLiteDatabase db) {
// create tables
db.execSQL(EMPLOYEE_TABLE_SQL);
Log.e("TABLE CREATE", EMPLOYEE_TABLE_SQL);
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// upgrade logic
}
// insert
public long insertEmployee(Employee emp) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(NAME_FIELD, emp.getName());
values.put(EMAIL_FIELD, emp.getEmail());
long inserted = db.insert(EMPLOYEE_TABLE, null, values);
db.close();
return inserted;
}
// query
public ArrayList<Employee> getAllEmployees() {
ArrayList<Employee> allEmployees = new ArrayList<Employee>();
SQLiteDatabase db = this.getReadableDatabase();
// String[] columns={NAME_FIELD, EMAIL_FIELD, PHONE_FIELD};
// SELECT * FROM EMPLOYEE;
Cursor cursor = db.query(EMPLOYEE_TABLE, null, null, null, null, null,
null);
// Cursor cursor = db.rawQuery("SELECT * FROM EMPLOYEE", null);
if (cursor != null && cursor.getCount() > 0) {
cursor.moveToFirst();
for (int i = 0; i < cursor.getCount(); i++) {
//
int id = cursor.getInt(cursor.getColumnIndex(ID_FIELD));
String name = cursor.getString(cursor
.getColumnIndex(NAME_FIELD));
String email = cursor.getString(cursor
.getColumnIndex(EMAIL_FIELD));
Employee e = new Employee(id, name, email);
allEmployees.add(e);
cursor.moveToNext();
}
}
cursor.close();
db.close();
return allEmployees;
}
}
When i put data and pressed the save button then my data is saved and show in my ListView.
But when i close the apps and open it then i don't see any data in my ListView.
After putting data and pressed save button my new and existing data show in my ListView.
So how can i show my existing data in ListView after open my apps and without press the save button.

If you want to show data each time app starts, you would need to move your list populating code in onCreate
Move this code to onCreate instead of Save button's onClick
ArrayList<Employee> employees = dbHelper.getAllEmployees();
if (employees != null && employees.size() > 0) {
adapter = new CustomizedAdapter(this, employees);
lvEmployees.setAdapter(adapter);
}
Hope it helps.
P.S: If you need to repopulate list after Save button's click, make a separate function which contains this code. And call tha function in onCreate as well as in Save button's onClick

You are setting the adapter for the list view in your save method that is called only when you actually press the save button. Here's the part where you do it.
ArrayList<Employee> employees = dbHelper.getAllEmployees();
if (employees != null && employees.size() > 0) {
adapter = new CustomizedAdapter(this, employees);
lvEmployees.setAdapter(adapter);
}
Thats why there is no data in the listview when you open the app.
You should do this in your onCreate method, and in your save you should do something like this:
1. declare the the arraylist of employees along with listview;
ArrayList<Employee> employees;
in your oncreate call this code that you should remove from the save method
employees = dbHelper.getAllEmployees();
if (employees != null && employees.size() > 0) {
adapter = new CustomizedAdapter(this, employees);
lvEmployees.setAdapter(adapter);
}
in save method just add one more item to the list, and notify adapter that there has been a change in the data it's displaying.
employees.add(employee);
adapter.notifyDataSetChanged();

How to avoid duplicate contact name (data ) while loading contact info to listview?

I am populating contact list details to list view successfully.
My code:
String order = ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME + " ASC";
Cursor curLog = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null,null,order);
How can I avoid the duplicate data In List view as the contact details is repeating if its joined contact i.e. joined with both phone and Google?. The screen is like
I want to select programmatically only 1 name not the both? Any Idea how I can select?

I have used a rough way to avoid this problem which helped me so much and working nicely.
i.e
Use local database (SQLite) to avoid duplicate data by make phone number to unique.
I have made one SQLite DB to handle this problem:
ContactMerger.java:
public class ContactMerger {
private static final String CONTACT_TABLE = "_contact_table";
private static final String CONTACT_ID = "_contactId";
private static final String CONTACT_NAME = "_contactName";
private static final String CONTACT_MOBILE_NUMBER = "_contactNumber";
private static final String CONTACT_DATE = "_contactDate";
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "DB_Contact";
private final Context context;
private SQLiteDatabase ourDatabase;
private DbHelper ourHelper;
private class DbHelper extends SQLiteOpenHelper {
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
#Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
String contactQuery = "CREATE TABLE " + CONTACT_TABLE + " ("
+ CONTACT_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ CONTACT_NAME + " TEXT NOT NULL, " + CONTACT_DATE
+ " TEXT NOT NULL, " + CONTACT_MOBILE_NUMBER
+ " TEXT NOT NULL UNIQUE);";
db.execSQL(contactQuery);
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + CONTACT_TABLE);
onCreate(db);
}
}
public ContactMerger(Context context) {
this.context = context;
}
public ContactMerger open() throws SQLException {
ourHelper = new DbHelper(context);
ourDatabase = ourHelper.getWritableDatabase();
return this;
}
public void close() {
ourHelper.close();
}
// Insert Data to Contact Table
public long insertContacts(String name, String number, String date) throws SQLException {
ContentValues cv = new ContentValues();
cv.put(CONTACT_NAME, name);
cv.put(CONTACT_DATE, date);
cv.put(CONTACT_MOBILE_NUMBER, number);
Log.d("Insert Data", cv.toString());
return ourDatabase.insert(CONTACT_TABLE, null, cv);
}
//Get Contact details from Contact Table
public ArrayList<ContactHolder> getContactDetails() throws Exception{
ArrayList<ContactHolder> contactDetails = new ArrayList<ContactHolder>();
String[] columns = new String[] { CONTACT_ID, CONTACT_NAME, CONTACT_DATE, CONTACT_MOBILE_NUMBER };
Cursor c = ourDatabase.query(CONTACT_TABLE, columns, null, null, null,null, null);
int iContactName = c.getColumnIndex(CONTACT_NAME);
int iContactDate = c.getColumnIndex(CONTACT_DATE);
int iContactMobileNumber = c.getColumnIndex(CONTACT_MOBILE_NUMBER);
for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {
ContactHolder data = new ContactHolder();
data.setName(c.getString(iContactName));
data.setDate(c.getString(iContactDate));
data.setNumber(c.getString(iContactMobileNumber));
contactDetails.add(data);
}
return contactDetails;
}
}
Here ContactHolder is just a getter/setter class to handle contact entities.
First I inserted all Contact information once in my MainActivity by the help of a background thread. It prevents to insert the contact info multiple times.
Something like:
private ArrayList<ContactHolder> contactHolder;
private void setCallLogs(Cursor managedCursor) {
contactHolder = new ArrayList<ContactHolder>();
int _number = managedCursor
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER);
int _name = managedCursor
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME);
int _id = managedCursor
.getColumnIndex(ContactsContract.CommonDataKinds.Phone._ID);
while (managedCursor.moveToNext()) {
ContactHolder holder = new ContactHolder();
holder.setNumber(managedCursor.getString(_number));
holder.setName(managedCursor.getString(_name));
holder.setDate(managedCursor.getString(_id));
contactHolder.add(holder);
}
Thread t = new Thread(new Runnable() {
#Override
public void run() {
for(int i=0; i<contactHolder.size(); i++){
try{
ContactMerger merger = new ContactMerger(HomeActivity.this);
merger.open();
merger.insertContacts(contactHolder.get(i).getName(),
contactHolder.get(i).getNumber(),
contactHolder.get(i).getdate());
merger.close();
} catch(Exception e){
e.printStackTrace();
}
}
}
});
t.start();
}
At last I gtt all contact information inside an Asynctask(doInbackground()) and put in adapter/listview in its onPostExecute() method in the class I want to show.
Here:
#Override
protected ArrayList<ContactHolder> doInBackground(String... parameters) {
ArrayList<ContactHolder> filterContacts = new ArrayList<ContactHolder>();
ContactMerger merger = new ContactMerger(Aaja_Contact.this);
merger.open();
try {
filterContacts = merger.getContactDetails();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
merger.close();
return filterContacts;
}

I believe this may happen if the contact number is stored in two different ways/formats: for example in your case the number for Akshay may be saved as 982-0123456 and 9820123456
Did you try displaying the number along with the Name by including the Number as well in the list view?

You need to retrieve the data from the Cursor to HashSet (which don't allows duplicate itmes) and then pass the HashSet object to your ListView's Adapter
This is a dump solution but it will help you:
ListView listView;
Set<String> listItems;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listView);
listItems = new HashSet<String>();
String order = ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME + " ASC";
Cursor curLog = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null,null,order);
if(curLog != null) {
while(curLog.moveToNext()) {
String str = curLog.getString(curLog.getColumnIndexOrThrow(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME_PRIMARY));
listItems.add(str);
}
}
String listString = listItems.toString();
listString = listString.substring(1,listString.length()-1);
String[] newList = listString.split(", ");
ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1, newList);
listView.setAdapter(adapter);
}
Good luck..

Since you're querying Phone.CONTENT_URI, I'm assuming you're looking for contacts with phone number.. then you can use ContactsContract.Contacts.CONTENT_URI
String order = ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME + " ASC";
Cursor curLog = getContentResolver().query(ContactsContract.Contacts.CONTENT_URI, null,
ContactsContract.Contacts.HAS_PHONE_NUMBER + "=?", new String[] { "1" }, order);

Its because the listview is showing both normal contacts as well as whatsapp( or like this) linked contacts. Best is to store all the contacts in a Database and then retrieve the contacts using "select distinct..." command of SQL.

String order = ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME + " ASC";
Cursor phones = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null,null, order);
String temp_name="";
while (phones.moveToNext())
{
String name=phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
if (name.equals(temp_name))
continue;
temp_name=name;
//add name to your list or adapter here`enter code here`
}
phones.close();

When you loop through your contacts, here's something you can do in the looping statement while you add your next object to avoid creating a duplicate contact:
UserList object=new UserList(name,number);
if(arrayList.size()==0)
{
arrayList.add(object);
}
if(arrayList.size()>0) {
position = arrayList.size();
if (!(arrayList.get(arrayList.position - 1).getName().equals(number) ||
arrayList.get(position - 1).getNumber().equals(number)))
{
arrayList.add(object); }
}
Here, in my object of 'UserList' class, the name and number would repeat from the contact list, so this code just checks if the previous object has the same name or number before adding in the new one.

Old question but still relevant. I could not find suitable query to skip dupes with contentresolver but it's possible to compare all contacts for duplicates by phone number.
With com.googlecode.libphonenumber library it's really simple. Method public MatchType isNumberMatch(CharSequence firstNumber, CharSequence secondNumber) compares number, coutry code, mask and return one of MatchType enum value.

"Null" appended to database input values from a delimited string

I wonder if someone could show me the error of my ways--I've been struggling with this issue for two days, and realize it must be a fundamental error of initializing variables, but...that reflects the level of my java knowledge.
I'm getting a database result on a delimited string wherein each of the segments has "null" appended to it. It seems that no matter how I change the initialization...well, two days!
I'm declaring the following in the class heading area:
private String strListContent;
private SQLiteDatabase database;
private DatabaseHelper helper2 = new DatabaseHelper(this);
private static final String fields[] = { "_id", "listTitle", "listType",
"listContent", "dateCreated", "dateModified" };
private ArrayList<String> textArray = new ArrayList<String>();
private ArrayList<Integer> imageArray = new ArrayList<Integer>();
Then concatenating my items in
final ImageButton addItem = (ImageButton) findViewById(R.id.btnToAddItem);
addItem.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
itemEdit = (EditText) findViewById(R.id.editTextItem);
if (itemEdit.getText().toString().equals("")) {
showToastMessage("Please enter an item to add...");
} else {
String newListItem = itemEdit.getText().toString();
strListContent += newListItem + "|~|";
...
}}}
I'm using the following bare-bones SQLiteOpenHelper:
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String KEY_ID = "_id";
public DatabaseHelper(Context context) {
super(context, "Cursor", null, 1);
}
#Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE IF NOT EXISTS list_data ("
+ KEY_ID
+ " INTEGER PRIMARY KEY AUTOINCREMENT, listTitle TEXT, listType TEXT, listContent TEXT, dateCreated TEXT, dateModified TEXT)");
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Steps to upgrade the database for the new version ...
}
}
To insert the values as so:
ImageButton saveAndBack = (ImageButton) findViewById(R.id.btnSaveBack);
saveAndBack.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
String title = null;
String listContent = null;
Calendar javaCalendar = null;
title = titleEdit.getText().toString();
title = (title=="" || title==null)?"Untitled List":title;
strListContent = (strListContent=="" || strListContent==null)?"No Items|~|":strListContent;
listContent = strListContent;
String type = "R"; //"Regular List"
javaCalendar = Calendar.getInstance();
String currentDate = javaCalendar.get(Calendar.MONTH) + "/" + (javaCalendar.get(Calendar.DATE) + 1) + "/" + javaCalendar.get(Calendar.YEAR);
database = helper2.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("listTitle", title);
values.put("listType", type);
values.put("listContent", listContent);
values.put("dateCreated", currentDate);
values.put("dateModified", currentDate);
database.insert("list_data", null, values);
Intent i = new Intent(RegularList.this, ActivityMain.class);
startActivity(i);
}
});
}
//
//End of OnCreate(){}
//
Then, when I retrieve from another activity:
DatabaseHelper helper = new DatabaseHelper(this);
database = helper.getWritableDatabase();
Cursor data = database.query("list_data", fields, null, null, null,
null, null);
Integer tindex = data.getColumnIndex("listTitle");
Integer iindex = data.getColumnIndex("listType");
Integer cindex = data.getColumnIndex("listContent");
itemCount = 0;
for (data.moveToFirst(); !data.isAfterLast(); data.moveToNext()) {
showToastMessage(data.getString(cindex));
titleArrayList.add(data.getString(tindex));
if (data.getString(iindex) == "R") {
imageArrayList.add(R.drawable.listview_regular);
} else if (data.getString(iindex) == "L") {
imageArrayList.add(R.drawable.listview_location);
} else {
imageArrayList.add(R.drawable.listview_regular);
}
itemCount++;
}
data.close();
...
I can see in the toast message that each item from the delimited string has "null" appended to the front of it...the other values are fine. I hope this hasn't been too verbose, but...any recommendations? Thanks!

To me it looks like you may have simply not initialised the String strListContent before you first append to it with:
strListContent += newListItem + "|~|";
When you do that, you'll get a "null" prefixed in front of the value you are trying to append, just as you observe.
Perhaps you can just initialise in the declaration:
private String strListContent = "";