"java.lang.NullPointerException" Error when trying to insert data to sqlite (Android) - android-listview

Question

I face the error :
1566-1566/com.example.rom.romproject E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.rom.romproject, PID: 1566
java.lang.IllegalStateException: Could not execute method of the activity
at android.view.View$1.onClick(View.java:3823)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at android.view.View$1.onClick(View.java:3818)
            at android.view.View.performClick(View.java:4438)
            at android.view.View$PerformClick.run(View.java:18422)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.example.rom.romproject.ContactView.contactFavorite(ContactView.java:37)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at android.view.View$1.onClick(View.java:3818)
            at android.view.View.performClick(View.java:4438)
            at android.view.View$PerformClick.run(View.java:18422)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)
This happens when im clicking on a button i created.
The button purpose is to insert Data into my sql table.
The SQL class :
public class sqlDatabaseAdapter
{
sqlHelper helper;
public sqlDatabaseAdapter(Context context)
{
helper = new sqlHelper(context);
}
public long insertData(String name, String phone)
{
SQLiteDatabase db = helper.getWritableDatabase();
ContentValues content = new ContentValues();
content.put(sqlHelper.NAME, name);
content.put(sqlHelper.PHONE, phone);
return db.insert(helper.TABLE_NAME, null, content);
}
static class sqlHelper extends SQLiteOpenHelper
{
static final String DATABASE_NAME = "ContactDB";
static final String TABLE_NAME = "Favorites";
static final int DB_VERSION = 1;
static final String UID = "_id";
static final String NAME = "Name";
static final String PHONE = "Phone";
static final String CREATE_TABLE = "CREATE TABLE "+ TABLE_NAME +" ("+UID+" INTEGER PRIMARY KEY AUTOINCREMENT, "+NAME+" VARCHAR(255), "+PHONE+" VARCHAR(255));";
static final String DROP_TABLE = "DROP TABLE IF EXISTS"+TABLE_NAME;
private Context context;
public sqlHelper(Context context)
{
super(context, DATABASE_NAME, null, DB_VERSION);
this.context = context;
Message.Message(context, "Constructor Called");
}
#Override
public void onCreate(SQLiteDatabase db)
{
try {
db.execSQL(CREATE_TABLE);
Message.Message(context, "onCreate Called");
} catch( SQLException e)
{
Message.Message(context, "" + e);
}
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
try {
db.execSQL(DROP_TABLE);
onCreate(db);
Message.Message(context, "OnUpgrade Called");
} catch(SQLException e)
{
Message.Message(context, "" + e);
}
}
}
}
Now, im not rly sure at the source of the problem , so i will post both of my activites.
Btw : the info im trying to insert to the SQL is a contact name and phone
(that i get from the main activity list view).
Main Activity ( List view of phone contacts ) :
public class MainActivity extends ListActivity {
ListView l;
Cursor cursor;
SimpleCursorAdapter listAdapter;
sqlDatabaseAdapter helper;
#Override
public int getSelectedItemPosition()
{
return super.getSelectedItemPosition();
}
#Override
public long getSelectedItemId()
{
return super.getSelectedItemId();
}
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);
startManagingCursor(cursor);
String[] from = {ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,ContactsContract.CommonDataKinds.Phone.NUMBER, ContactsContract.CommonDataKinds.Phone._ID};
int[] to = {android.R.id.text1,android.R.id.text2};
listAdapter = new SimpleCursorAdapter(this,android.R.layout.simple_list_item_2,cursor,from,to);
setListAdapter(listAdapter);
l = getListView();
l.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
helper = new sqlDatabaseAdapter(this);
helper.helper.getWritableDatabase();
}
#Override
protected void onListItemClick(ListView l, View v, int position, long id)
{
super.onListItemClick(l, v, position, id);
TextView _tempName= (TextView)v.findViewById(android.R.id.text1);
String _temp = _tempName.getText().toString();
TextView _tempPhone = (TextView)v.findViewById(android.R.id.text2);
String _temp2 = _tempPhone.getText().toString();
Intent intent = new Intent(this, ContactView.class);
intent.putExtra("contactName", _temp);
intent.putExtra("contactPhone", _temp2);
startActivity(intent);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
The second activity (where the button is ) :
public class ContactView extends ActionBarActivity {
Button _Call;
Button _Favorite;
FavoriteContact contact = new FavoriteContact();
sqlDatabaseAdapter helper;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_contact_view);
_Call = (Button)findViewById(R.id.bCall);
_Favorite = (Button)findViewById(R.id.bFavorite);
contact.setName(getIntent().getExtras().getString("contactName"));
contact.setPhone(getIntent().getExtras().getString("contactPhone"));
setTitle(contact.getName());
}
public void contactFavorite(View view)
{
long id = 0L;
id = helper.insertData(contact.getName(), contact.getPhone());
/*
if( id < 0)
{
Message.Message(this, "Unsuccessful");
}
else
{
Message.Message(this, "Successfully inserted to favorite contacts ");
}
*/
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_contact_view, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Contact class i created and FavoriteContact class :
(favoritecontact extends Contact)
public class Contact
{
private String Name = null;
private String Phone = null;
public String getPhone() {
return Phone;
}
public void setPhone(String phone) {
Phone = phone;
}
public String getName() {
return Name;
}
public void setName(String name) {
Name = name;
}
}
public class FavoriteContact extends Contact
{
private Boolean isFavorite;
public Boolean getIsFavorite() {
return isFavorite;
}
public void setIsFavorite(Boolean isFavorite) {
this.isFavorite = isFavorite;
}
}
i think i gave everything i need...
sorry for my bad english and its my first time posting here so i dont rly know how it works :D
thanks for every bit of help .

Answer 1

The variable helper is never initialized in ContactView.