Develop Reference

Populate ListView with two tables in database in Android Studio

I have two tables. tblsubject and tbltopics. I want to list all the subjects with the number of topics every subject.
getSubject()
public Cursor getAllSubject() {
String where = null;
Cursor c = db.query(true, DATABASE_TABLE, ALL_KEYS, where, null, null, null, null, null);
if (c != null) {
c.moveToFirst();
}
return c;
}
countTopics()
public int countTopics(long subjectid) {
String where = KEY_TOPICSUBJECTID + " = " + subjectid;
Cursor c = db.query(true, DATABASE_TABLE2, ALL_KEYS2,
where, null, null, null, null, null);
if (c != null) {
c.moveToFirst();
}
return c.getCount();
}
viewList() this is where i populate my listview
#TargetApi(Build.VERSION_CODES.HONEYCOMB)
public void viewList() {
Cursor cursor = myDb.getAllSubject();
String[] fromFieldNames = new String[]{DBAdapter.KEY_SUBJECTID, DBAdapter.KEY_SUBJECT, DBAdapter.KEY_DATESUBJECT};
int[] toViewIds = new int[]{R.id.txtViewSubjectId, R.id.txtViewSubject, R.id.txtSubjectDateCreated};
SimpleCursorAdapter myCursorAdapter;
myCursorAdapter = new SimpleCursorAdapter(getBaseContext(), R.layout.activity_view_the_list, cursor, fromFieldNames, toViewIds, 0);
ListView myList = (ListView) findViewById(R.id.listView);
myList.setAdapter(myCursorAdapter);
}
My problem is how to add the number of topics every subject. I can display the Subjects. Thank you.

You can run a direct raw sql with an UNION from your tables. Something like this:
String select = "Select * FROM table1 UNION Select * FROM table2";
Cursor c = return db.rawQuery(select, new String[]{});

You can update your subject SQL statement with a subquery to return the topic count from the database. See https://thoughtbot.com/blog/back-to-basics-sql#sub-queries
On a separate note, I would recommend using your own custom AsyncTask and ArrayAdapter.
https://developer.android.com/guide/topics/ui/layout/recyclerview
This will make your UI more responsive and allow you customize the data access and rendering.
By using a custom adapter you can over ride the getView function to control the result and do additional fetches. For example, lazy loading images into the listview display.
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = inflater.inflate(R.layout.subjectitem, null);
}
if (position % 2 == 1) {
v.setBackgroundColor(Color.rgb(234, 234, 234));
} else {
v.setBackgroundColor(Color.WHITE);
}
YOURDATAOBJECT p = itemList.get(position);
TextView name = (TextView) v.findViewById(R.id.name);
TextView topcount = (TextView) v.findViewById(R.id.topcount);
//You can run our additional data fetches here and update the UI

ListView does not change elements at scrolling

I have several markers on a google map and in each marker a ListView with several entries.
Each entry can be liked by the user and if he has liked, there is stored an entry in the SQLite Database with the marker ID, the entry ID and if he has liked (1) or took the like back (0) and the activity is reloaded.
Now I want a filled heart to be shown below each List Item the user has liked. The problem is: Especially if there are many entries, there are randomly filled hearts, even if the user only liked one entry. These falsely filled hearts sometimes appear only at scrolling up so I assume, that the ListView does not update its elements at scrolling...
Here is my code:
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ListCell cell;
if (convertView == null) {
convertView = inflater.inflate(R.layout.pinboard_list_view_cell, null);
cell = new ListCell();
cell.likes = (TextView) convertView.findViewById(R.id.listViewLikes);
cell.note = (TextView) convertView.findViewById(R.id.listViewNote);
cell.img = (ImageView) convertView.findViewById(R.id.listViewImg);
cell.likeImage = (ImageView) convertView.findViewById(R.id.heartImage);
convertView.setTag(cell);
}
else {
cell = (ListCell)convertView.getTag();
}
cell.position = position;
//Listen-Items mit entsprechenden Elementen aus dem heruntergeladenen Array befüllen
try {
JSONObject jsonObject = this.dataArray.getJSONObject(position);
cell.likes.setText(jsonObject.getString("likes"));
cell.note.setText(jsonObject.getString("note"));
cell.entryID = jsonObject.getString("id");
String img = jsonObject.getString("image");
String urlForImageInServer = baseUrlForImage + img;
Picasso.with(context)
.load(urlForImageInServer)
.placeholder(R.drawable.progress_animation)
.error(R.drawable.no_picture)
.into(cell.img);
objectID = ""+cell.entryID;
dbh = new DbHelper(context);
cursor = getLikes(dbh);
cursor.moveToFirst();
if (cursor.moveToFirst()) {
do {
if (Integer.parseInt(cursor.getString(2)) == 1) {
cell.likeImage.setImageResource(R.drawable.heart_filled);
}
else {
cell.likeImage.setImageResource(R.drawable.heart);
}
}
while(cursor.moveToNext());
}
else {
cursor.close();
}
cursor.close();
}
catch (JSONException e) {
e.printStackTrace();
}
return convertView;
}
public static class ListCell {
private TextView likes;
private TextView note;
private ImageView img;
public ImageView likeImage;
public int position;
public String entryID;
}
public Cursor getLikes(DbHelper dbh) {
dbase = dbh.getReadableDatabase();
String columns[] = {dbh.LIKES_MARKERID, dbh.LIKES_ENTRYID, dbh.LIKES_LIKE};
String selection = dbh.LIKES_MARKERID + " LIKE ? AND " + dbh.LIKES_ENTRYID + " LIKE ? ";
String args[] = {markerID.toString(), objectID};
Cursor cursor = dbase.query(dbh.TABLE_LIKES, columns, selection, args , null, null, null, null);
return cursor;
}

if there are no likes make sure you set disable heart image explictly. Right now it seems you are trying to set it inside do while loop, if flow doesn't goes inside this loop, recycled view will be used which may or may not have disabled heart.

How to search the data in listview by more than one thing?

Right now, my app filters the data in a listview when somethings is entered into the editText, but it can only filter by one thing at a time. I want it to be able to filter by more than value. For example, if someone types in "chicken" it should filter the recipes by the word 'chicken'. But, if someone then types in "dinner", I want it to filter the recipes by both "chicken" and "dinner." Eventually, I want to make it so those values appear as checkboxes above the listview so they can be easily removed.
I can't figure out how to do this. I played around with loops at first but didn't really get anywhere.
public class SearchActivity extends NavDrawerActivity {
private DBHandler dbHelper;
private SimpleCursorAdapter dataAdapter;
ArrayList<String> filters = new ArrayList<String>();
//String[] filters;
FrameLayout frameLayout;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main_activity3);
frameLayout = (FrameLayout) findViewById(R.id.activity_frame);
// inflate the custom activity layout
LayoutInflater layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View activityView = layoutInflater.inflate(R.layout.activity_main_activity3, null, false);
// add the custom layout of this activity to frame layout.
frameLayout.addView(activityView);
dbHelper = new DBHandler(this, null, null, 1);
//dbHelper.open();
//Clean all data
dbHelper.deleteAllRecipes();
//Add some data
dbHelper.insertSomeRecipes();
//Generate ListView from SQLite Database
displayListView();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
private void displayListView() {
final Cursor cursor = dbHelper.fetchAllRecipes();
// The desired columns to be bound
String[] columns = new String[]{
//DBHandler.COLUMN_CODE,
DBHandler.COLUMN_NAME,
DBHandler.COLUMN_TYPE,
DBHandler.COLUMN_INGRED
};
// the XML defined views which the data will be bound to
int[] to = new int[]{
//R.id.code,
R.id.name,
R.id.type,
R.id.ingredient,
};
// create the adapter using the cursor pointing to the desired data
//as well as the layout information
dataAdapter = new SimpleCursorAdapter(
this, R.layout.recipeinfo,
cursor,
columns,
to,
0);
ListView listView = (ListView) findViewById(R.id.listView1);
// Assign adapter to ListView
listView.setAdapter(dataAdapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> listView, View view,
int position, long id) {
// Get the cursor, positioned to the corresponding row in the result set
Cursor cursor = (Cursor) listView.getItemAtPosition(position);
String recipeName = cursor.getString(cursor.getColumnIndexOrThrow("name"));
Intent n = new Intent(getApplicationContext(), RecipeActivity.class);
//n.putExtra("position", position);
n.putExtra("recipeName", recipeName);
startActivity(n);
}
});
//final GridView gridView = (GridView)findViewById(R.id.gridView);
final TextView tv = (TextView)findViewById(R.id.textView14);
final EditText myFilter = (EditText) findViewById(R.id.myFilter);
myFilter.setImeActionLabel("Filter",1);
myFilter.setPrivateImeOptions("actionUnspecified");
myFilter.setOnEditorActionListener(new TextView.OnEditorActionListener() {
#Override
public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {
if (id == 1 || id == EditorInfo.IME_NULL) {
String filter = textView.getText().toString();
dataAdapter.getFilter().filter(filter);
filters.add(filter);
tv.append(filter);
myFilter.setText("");
}
return false;
}
});
dataAdapter.setFilterQueryProvider(new FilterQueryProvider() {
public Cursor runQuery(CharSequence constraint) {
return dbHelper.fetchRecipesByName(constraint.toString());
}
});
}
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// Then you start a new Activity via Intent
Intent intent = new Intent();
intent.setClass(this, RecipeActivity.class);
intent.putExtra("position", position);
// Or / And
intent.putExtra("id", id);
startActivity(intent);
}
}
fetchRecipesByName in DBHandler
public Cursor fetchRecipesByName(String inputText) throws SQLException {
SQLiteDatabase mDb = this.getWritableDatabase();
Log.w(TAG, inputText);
Cursor mCursor = null;
if (inputText == null || inputText.length () == 0) {
mCursor = mDb.query(SQLITE_TABLE, new String[] {COLUMN_ROWID,
COLUMN_NAME, COLUMN_TYPE, COLUMN_INGRED, COLUMN_IMGPATH},
null, null, null, null, null);
}
else {
mCursor = mDb.query(true, SQLITE_TABLE, new String[] {COLUMN_ROWID,
COLUMN_NAME, COLUMN_TYPE, COLUMN_INGRED, COLUMN_IMGPATH},
COLUMN_NAME + " like '%" + inputText + "%'" + " or " +
COLUMN_TYPE + " like '%" + inputText + "%'" + " or " +
COLUMN_INGRED + " like '%" + inputText + "%'",
null, null, null, null, null);
}
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}

What is the implementation of dbHelper.fetchReccipesByName()? I think, as of now, it queries the table only by one thing. You should change its logic and implement your complex need in this method (obviously, it should be an SQL query execution).
As a best practice, you should call listView.setFilterText() instead of dataAdapter.getFilter().filter(), because this method is supposed to run in secondary thread for the reason that DB queries are time consuming. If you call listView.setFilterText(), the framework will take care of threading and calls filter.filter() in secondary thread.
And finally, since you are searching by more than one keyword, but setFilterText() accepts only one CharSequence param, you should encode somehow many keywords into single String (say comma separated). And while querying you could decode the constraint to get the keywords.

Retrieving data from SQLite and displaying in Listview

I am trying to display the contents of my mysqlite database into a listview,
I am able to get the contents and display them in a textview, but for some
reason I can't add the details to an arraylist ? I am not too sure what am doing
wrong. I have looked for multiple solutions but none of them seem to work, am getting an error
Android.database.CursorIndexOutOfBoundsExecption: Index requested -1
Here is what I currently have:
OnCreate:
ArrayAdapter<Contact> currentContactsAdapter = new ContactArrayAdapter();
ListView lvcontacts = (ListView) findViewById(R.id.lvContacts);
lvcontacts.setAdapter(currentContactsAdapter);
tdb = new TestDBOpenHelper(this, "contact.db", null, 1);
sdb = tdb.getWritableDatabase();
new MyContacts().execute();
ListView Adapter:
private class ContactArrayAdapter extends ArrayAdapter<Contact>{
public ContactArrayAdapter(){
super(MainActivity.this, R.layout.listviewitem, addedContacts);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View itemView = convertView;
if(itemView == null){
itemView = getLayoutInflater().inflate(R.layout.listviewitem, parent, false);
}
Contact currentContact = addedContacts.get(position);
TextView name = (TextView) itemView.findViewById(R.id.tvNameitem);
name.setText(currentContact.getName());
TextView phone = (TextView) itemView.findViewById(R.id.tvPhoneitem);
phone.setText(currentContact.getPhone());
TextView email = (TextView) itemView.findViewById(R.id.tvEmailitem);
email.setText(currentContact.getEmail());
return itemView;
}
}
GetContacts:
class MyContacts extends AsyncTask<String, String, String> {
List<Contact> retrievedContacts = new ArrayList<Contact>();
protected String doInBackground(String... args) {
String cname;
String cphone;
String cemail;
// name of the table to query
String table_name = "contact";
// the columns that we wish to retrieve from the tables
String[] columns = {"FIRST_NAME", "PHONE", "EMAIL"};
// where clause of the query. DO NOT WRITE WHERE IN THIS
String where = null;
// arguments to provide to the where clause
String where_args[] = null;
// group by clause of the query. DO NOT WRITE GROUP BY IN THIS
String group_by = null;
// having clause of the query. DO NOT WRITE HAVING IN THIS
String having = null;
// order by clause of the query. DO NOT WRITE ORDER BY IN THIS
String order_by = null;
// run the query. this will give us a cursor into the database
// that will enable us to change the table row that we are working with
Cursor c = sdb.query(table_name, columns, where, where_args, group_by,
having, order_by);
for(int i = 0; i < c.getCount(); i++) {
cname = c.getString(c.getColumnIndex("FIRST_NAME"));
cphone = c.getString(c.getColumnIndex("PHONE"));
cemail = c.getString(c.getColumnIndex("EMAIL"));
c.moveToNext();
retrievedContacts.add(new Contact(cname,cphone,cemail));
}
return null;
}
//Update Contact list when response from server is received
#Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
for(Contact contact: retrievedContacts)
addedContacts.add(contact);
}
}

It seems that your table "contact" doesn't have the exact structure you are trying to read.
Android.database.CursorIndexOutOfBoundsExecption: Index requested -1
This means that one of these column names is not part of it.
c.getColumnIndex("FIRST_NAME")
c.getColumnIndex("PHONE")
c.getColumnIndex("EMAIL")
So one of them return -1 instead of the index because they not exist in the table.
EDIT:
Then the for loop may be faulty. I suggest to use something like:
if (c != null ) {
if (c.moveToFirst()) { // Always move at the first item
do {
cname = c.getString(c.getColumnIndex("FIRST_NAME"));
cphone = c.getString(c.getColumnIndex("PHONE"));
cemail = c.getString(c.getColumnIndex("EMAIL"));
retrievedContacts.add(new Contact(cname, cphone, cemail));
} while (c.moveToNext());
}
}
c.close(); // always close when done!

how to get contact number into Text view?

this is is the code i have but everytime i click on the contact it force closes. and is there a code so that when i get the contact it adds it into a text view?
public static final String TAG = "ContactManager";
private Button mAddAccountButton;
private ListView mContactList;
private boolean mShowInvisible;
private CheckBox mShowInvisibleControl;
/**
* Called when the activity is first created. Responsible for initializing the UI.
*/
#Override
public void onCreate(Bundle savedInstanceState)
{
Log.v(TAG, "Activity State: onCreate()");
super.onCreate(savedInstanceState);
setContentView(R.layout.main2);
// Obtain handles to UI objects
mAddAccountButton = (Button) findViewById(R.id.AddContact);
mContactList = (ListView) findViewById(R.id.ContactList);
mShowInvisibleControl = (CheckBox) findViewById(R.id.ShowInvisible);
// Initialize class properties
mShowInvisible = false;
mShowInvisibleControl.setChecked(mShowInvisible);
// Register handler for UI elements
mAddAccountButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Log.d(TAG, "mAddAccountButton clicked");
launchContactAdder();
}
});
mShowInvisibleControl.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
Log.d(TAG, "mShowInvisibleControl changed: " + isChecked);
mShowInvisible = isChecked;
populateContactList();
}
});
// Populate the contact list
populateContactList();
}
/**
* Populate the contact list based on account currently selected in the account spinner.
*/
private void populateContactList() {
// Build adapter with contact entries
Cursor cursor = getContacts();
String[] fields = new String[] {
ContactsContract.Data.DISPLAY_NAME
};
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.main, cursor,
fields, new int[] {R.id.TextView01});
mContactList.setAdapter(adapter);
}
/**
* Obtains the contact list for the currently selected account.
*
* #return A cursor for for accessing the contact list.
*/
private Cursor getContacts()
{
// Run query
Uri uri = ContactsContract.Contacts.CONTENT_URI;
String[] projection = new String[] {
ContactsContract.Contacts._ID,
ContactsContract.Contacts.DISPLAY_NAME
};
String selection = ContactsContract.Contacts.IN_VISIBLE_GROUP + " = '" +
(mShowInvisible ? "0" : "1") + "'";
String[] selectionArgs = null;
String sortOrder = ContactsContract.Contacts.DISPLAY_NAME + " COLLATE LOCALIZED ASC";
return managedQuery(uri, projection, selection, selectionArgs, sortOrder);
}
/**
* Launches the ContactAdder activity to add a new contact to the selected account.
*/
protected void launchContactAdder() {
Intent i = new Intent(this,Class1.class);
startActivity(i);
}
}

based on my experience with the contacts list, you need to design your query based on what is available. In 1.6 there was the simplicity of one table with all the information. However; with the dawn of 2.0, they introduced two tables. Where you get the ID from one table and the query based on this ID to find the phone number. To illustrate this here is a piece of sample code that worked for me, although i'm having some minor problems where some contacts won't return a phone number 2/70 although all 70 users have an ID and Phone number. I hope it helps:
// look up contact via name
String name = contacts.getItem(arg1);
Uri lookup = Uri.withAppendedPath(
ContactsContract.Contacts.CONTENT_FILTER_URI, name);
// look up id
Cursor c = getContentResolver().query(lookup, null, null, null, null);
String id = null;
int id_index = c.getColumnIndexOrThrow(ContactsContract.Contacts._ID);
if (c.moveToFirst())
id = c.getString(id_index);
else
Toast.makeText(getApplicationContext(), "Friend not found",
Toast.LENGTH_SHORT).show();
c.close();
// use id if not null, to find contact's phone number / display name
if (id != null) {
String where = ContactsContract.Data.CONTACT_ID + " = " + id
+ " AND " + ContactsContract.Data.MIMETYPE + " = '"
+ ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE
+ "'";
c = getContentResolver().query(ContactsContract.Data.CONTENT_URI,
null, where, null, null);
c.moveToFirst();
int iname = c
.getColumnIndexOrThrow(ContactsContract.Contacts.DISPLAY_NAME);
int iphone = c
.getColumnIndexOrThrow(ContactsContract.CommonDataKinds.Phone.NUMBER);
if (c.getCount() > 0) {
_friend.setName(c.getString(iname));
_friend.setPhone(c.getString(iphone));
If you have any further questions, please don't hesitate to ask, I'll do my best to answer them. For what I can tell without a log cat is that you are attempting a look up of the phone number the proper table structure for the query. If you try to access information from a query that returned 0 rows, then you'll get an exception. Please read that error and display it.

You have to use for all Email, Phone Numbers, Web-Address etc.
Example:
Linkify.addLinks(textView, Linkify.WEB_URLS);
Parameter: textview which you are adding string
Which thing you want to track email,phone or web
For more details:
http://developer.android.com/reference/android/text/util/Linkify.html
Note: for this you no need to implement any onClick etc. Linkif automatically manage it.