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PO Android: Fill ListView with database
 

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    <p>Having followed several examples with no success, I find myself at a dead end on this issue. The issue I am encountering is how to fill a <code>ListView</code> with data from a database.</p> <p>The purpose is to create a screen with the listView which displays only the name column from the database, then when the item is selected the application goes to a new screen where it displays the other data related to the item.</p> <p>The things I'd like help with understanding are filling the <code>ListView</code> with data from just the "Name" column from my database table "Contacts" and then, getting the data from the row of the database based on the selected item.</p> <p>Here is the code for the ContactsMenu class, where the names will be displayed.</p> <pre><code>package com.emailandcontactmanager; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.content.Intent; import android.database.Cursor; import android.os.Bundle; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.widget.Button; import android.widget.ListView; import android.widget.SimpleCursorAdapter; import android.widget.Toast; public class ContactsMenu extends Activity { ListView listView; public static final String fields[] = { DatabaseSetup.colName}; Cursor cursor; @Override public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.managecontacts); listView = (ListView) findViewById(R.id.lstContacts); DatabaseSetup.init(this); Button btnAddItem = (Button) findViewById(R.id.btnAddContact); btnAddItem.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { Intent addItem = new Intent(v.getContext(), AddContact.class); startActivity(addItem); } }); } @Override protected void onPause() { listView.setAdapter(null); cursor.close(); DatabaseSetup.deactivate(); super.onPause(); } @Override protected void onResume() { super.onResume(); DatabaseSetup.init(this); cursor = DatabaseSetup.getContactNames(); SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.row, cursor, fields, new int[] {R.id.item_text}); listView.setAdapter(adapter); } DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { switch (which){ case DialogInterface.BUTTON_POSITIVE: finish(); break; case DialogInterface.BUTTON_NEGATIVE: //Nothing happens on No button click, and the menu closes break; } } }; @Override public boolean onCreateOptionsMenu(Menu mainmenu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.mainmenu, mainmenu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { final CharSequence[] items = {"Contacts list", "Add Contact"}; switch (item.getItemId()) { case R.id.help: AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle("Select a function to revice information about it."); builder.setItems(items, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int selected) { switch(selected){ case 0: Toast.makeText(getApplicationContext(), "Allows you to view the selected item and make editations to it or delete it.", Toast.LENGTH_LONG).show(); break; case 1: Toast.makeText(getApplicationContext(), "Allows you to add a new contact by bringing up a screen where the nececary information can be entered.", Toast.LENGTH_LONG).show(); } } }); builder.show(); break; case R.id.back: AlertDialog.Builder builderBack = new AlertDialog.Builder(this); builderBack.setMessage("Are you sure?").setPositiveButton("Yes", dialogClickListener) .setNegativeButton("No", dialogClickListener).show(); break; } return true; } } </code></pre> <p>Database Setup Class</p> <pre><code>package com.emailandcontactmanager; import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; /* * usage: * DatabaseSetup.init(egActivityOrContext); * DatabaseSetup.createEntry() or DatabaseSetup.getContactNames() or DatabaseSetup.getDb() * DatabaseSetup.deactivate() then job done */ class DatabaseSetup extends SQLiteOpenHelper { static DatabaseSetup instance = null; static SQLiteDatabase db = null; public static void init(Context context) { if (null == instance) { instance = new DatabaseSetup(context); } } public static SQLiteDatabase getDb() { if (null == db) { db = instance.getWritableDatabase(); } return db; } public static void deactivate() { if (null != db &amp;&amp; db.isOpen()) { db.close(); } db = null; instance = null; } public static long createEntry(String name, String mail, String phone1, String phone2, String address, String notes) { ContentValues cv = new ContentValues(); cv.put(colName, name); cv.put(colMail, mail); cv.put(colPhone1, phone1); cv.put(colPhone2, phone2); cv.put(colAddress, address); cv.put(colNotes, notes); return getDb().insert(contactsTable, null, cv); } public static Cursor getContactNames() { // TODO Auto-generated method stub String[] columns = new String[] {"_id", colName }; return getDb().query(contactsTable, columns, null, null, null, null, null); } DatabaseSetup(Context context) { super(context, dbName, null, dbVersion); } @Override public void onCreate(SQLiteDatabase db) { // TODO Auto-generated method stub db.execSQL("CREATE TABLE IF NOT EXISTS " + contactsTable + " (_id integer primary key autoincrement, " + colName + " TEXT NOT NULL, " + colMail + " TEXT NOT NULL, " + colPhone1 + " TEXT NOT NULL, " + colPhone2 + " TEXT NOT NULL, " + colAddress + " TEXT NOT NULL, " + colNotes + " TEXT NOT NULL)"); db.execSQL("CREATE TABLE IF NOT EXISTS " + templatesTable + " (_id integer primary key autoincrement, " + colSubject + " TEXT NOT NULL, " + colBody + " TEXT NOT NULL)"); db.execSQL("CREATE TABLE IF NOT EXISTS " + tagsTable + " (_id integer primary key autoincrement, " + colTagName + " TEXT NOT NULL, " + colContact + " TEXT NOT NULL)"); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { db.execSQL("DROP TABLE IF EXISTS " + contactsTable); db.execSQL("DROP TABLE IF EXISTS " + templatesTable); db.execSQL("DROP TABLE IF EXISTS " + tagsTable); onCreate(db); } static final String dbName = "DB"; static final int dbVersion = 1; static final String contactsTable = "Contacts"; static final String colName = "Name"; static final String colMail = "Email"; static final String colPhone1 = "Phone1"; static final String colPhone2 = "Phone2"; static final String colAddress = "Address"; static final String colNotes = "Notes"; static final String templatesTable = "Templates"; static final String colSubject = "Subject"; static final String colBody = "Body"; static final String tagsTable = "Tags"; static final String colTagName = "Name"; static final String colContact = "Contact"; } </code></pre> <p>The code for the class to add to the contact menu. It used to work when I had a temporary display, however, now it does not.</p> <pre><code>package com.emailandcontactmanager; import android.app.Activity; import android.app.Dialog; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; public class AddContact extends Activity { Button saveContact; EditText contactName, contactMail, contactPhone1, contactPhone2, contactAddress, contactNotes; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.newcontact); contactName = (EditText) findViewById(R.id.txtName); contactMail = (EditText) findViewById(R.id.txtMail); contactPhone1 = (EditText) findViewById(R.id.txtPhone1); contactPhone2 = (EditText) findViewById(R.id.txtPhone2); contactAddress = (EditText) findViewById(R.id.txtAddress); contactNotes = (EditText) findViewById(R.id.txtNotes); // saveContact = (Button) findViewById(R.id.btnSaveContact); Button btnSaveContact = (Button) findViewById(R.id.btnSaveContact); btnSaveContact.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { boolean working = true; try{ String name = contactName.getText().toString(); String mail = contactMail.getText().toString(); String phone1 = contactPhone1.getText().toString(); String phone2 = contactPhone2.getText().toString(); String address = contactAddress.getText().toString(); String notes = contactNotes.getText().toString(); DatabaseSetup entry = new DatabaseSetup(AddContact.this); DatabaseSetup.getDb(); DatabaseSetup.createEntry(name, mail, phone1, phone2, address, notes); entry.close(); } catch(Exception e) { working = false; String error = e.toString(); Dialog d = new Dialog(AddContact.this); d.setTitle("Error"); TextView tv = new TextView(AddContact.this); tv.setText(error); } finally { if(working) { Dialog d = new Dialog(AddContact.this); d.setTitle("Success"); TextView tv = new TextView(AddContact.this); tv.setText("The database changes have succeeded."); d.setContentView(tv); d.show(); } } } }); } } </code></pre>
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    1. COyou using a custom adapter, right? please paste it. and also the db class.
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    2. COOk Is that what uou need? Also when following the example I looked at, my code had an error with the setReadableDatabase, and I was also unsure what the example meant for the second argument of the SimpleCursorAdapter with R.layout.row.
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    3. COI could really use some help with this, I cant quite figure it out, and it is halting my progress for now. I appreciate any support.
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