Develop Reference

eroors in sqlite database occourd in retriving the data from the table in android

my DataHandler activity code is
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DataHandlerDairy {
public static final String DATE = "date";
public static final String DAIRY = "dairy";
private static final String DATA_BASE_NAME = "mydairy";
private static final String TABLE_NAME = "table_dairy";
private static final int DATABASE_VERSION = 1;
private static final String TABLE_CREATE="create table table_diary (date text primary key," + "dairy text not null);";
DataBaseHelper1 dbhelper1;
Context ct;
SQLiteDatabase db;
public DataHandlerDairy(Context ct)
{
this.ct=ct;
dbhelper1 = new DataBaseHelper1(ct);
}
private static class DataBaseHelper1 extends SQLiteOpenHelper
{
public DataBaseHelper1(Context ct)
{
super(ct,DATA_BASE_NAME,null, DATABASE_VERSION);
}
#Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
try
{
db.execSQL(TABLE_CREATE);
}
catch(SQLException e)
{
e.printStackTrace();
}
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS table_dairy ");
onCreate(db);
}
}
public DataHandlerDairy open()
{
db = dbhelper1.getWritableDatabase();
return this;
}
public void close()
{
dbhelper1.close();
}
public long insertData(String date,String dairy)
{
ContentValues content = new ContentValues();
content.put(DATE, date);
content.put(DAIRY, dairy);
return db.insertOrThrow(TABLE_NAME, null, content);
}
public Cursor returnData(String date1) throws SQLException
{
Cursor c = db.query(true, TABLE_NAME, new String[] { DATE, DAIRY}, DATE + "=" + date1, null, null, null, null, null);
if(c!=null)
{
c.moveToFirst();
}
return c;
}
}
And when i try to use the save operation ie insertData() method in the DataHandler Activity. And storing the date I have got the date from another activity using Intents.
The code for Saving data into database is
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Toast;
public class Write_Dairy extends Activity {
EditText et1;
ImageButton correct,wrong;
DataHandlerDairy handler2;
String getdate;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_write__dairy);
et1 = (EditText) findViewById(R.id.writediary);
correct=(ImageButton) findViewById(R.id.correct1);
wrong=(ImageButton) findViewById(R.id.wrong1);
Bundle bundle = getIntent().getExtras();
getdate = bundle.getString("message");
correct.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
String getdairy = et1.getText().toString();
handler2 = new DataHandlerDairy(getBaseContext());
handler2.open();
long id = handler2.insertData(getdate,getdairy);
Toast.makeText(getBaseContext(), "your dairy is saved successfully", Toast.LENGTH_LONG).show();
handler2.close();
Intent ijk = new Intent(Write_Dairy.this,PickYourDate.class);
startActivity(ijk);
}
});
wrong.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
Toast.makeText(getBaseContext(), "please write your dairy again", Toast.LENGTH_LONG).show();
et1.setText("");
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_write__dairy, menu);
return true;
}
}
and for retriving the data i have used the date as primary key which i used it as string in both sql and java. the code for retriveing the data is
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Typeface;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;
public class Read_Dairy extends Activity {
String date1;
TextView tv1;
ImageButton imgb1;
Button bt1;
DataHandlerDairy handler3;
String getdata=" ";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_read__dairy);
tv1=(TextView) findViewById(R.id.readme);
imgb1=(ImageButton) findViewById(R.id.tick);
bt1=(Button) findViewById(R.id.ready);
Bundle bundle = getIntent().getExtras();
date1 = bundle.getString("kanna");
bt1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
handler3 = new DataHandlerDairy(getBaseContext());
handler3.open();
Cursor c = handler3.returnData(date1);
if(c.moveToFirst())
{
do
{
getdata=c.getString(1);
}while(c.moveToNext());
}
handler3.close();
if(getdata==null)
{
tv1.setText("no data exists for this date");
}
else
{
tv1.setText(c.getString(1));
}
}
});
imgb1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent ks = new Intent(Read_Dairy.this,PickYourDate.class);
startActivity(ks);
}
});
Typeface font = Typeface.createFromAsset(getAssets(), "Strato-linked.ttf");
tv1.setTypeface(font);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_read__dairy, menu);
return true;
}
}
The stack trace while i tried to store data is
E/SQLiteLog(16724): (1) no such table: table_dairy
D/AndroidRuntime(16724): Shutting down VM
E/AndroidRuntime(16724): FATAL EXCEPTION: main
E/AndroidRuntime(16724): Process: simple.smile.my_dairy, PID: 16724
E/AndroidRuntime(16724): android.database.sqlite.SQLiteException: no such table: table_dairy (code 1): , while compiling: INSERT INTO table_dairy(date,dairy) VALUES (?,?)
E/AndroidRuntime(16724): at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
E/AndroidRuntime(16724): at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
E/AndroidRuntime(16724): at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
E/AndroidRuntime(16724): at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
E/AndroidRuntime(16724): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
E/AndroidRuntime(16724): at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
E/AndroidRuntime(16724): at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1469)
E/AndroidRuntime(16724): at android.database.sqlite.SQLiteDatabase.insertOrThrow(SQLiteDatabase.java:1367)
E/AndroidRuntime(16724): at simple.smile.my_dairy.DataHandlerDairy.insertData(DataHandlerDairy.java:79)
E/AndroidRuntime(16724): at simple.smile.my_dairy.Write_Dairy$1.onClick(Write_Dairy.java:48)
E/AndroidRuntime(16724): at android.view.View.performClick(View.java:4832)
E/AndroidRuntime(16724): at android.view.View$PerformClick.run(View.java:19839)
E/AndroidRuntime(16724): at android.os.Handler.handleCallback(Handler.java:739)
E/AndroidRuntime(16724): at android.os.Handler.dispatchMessage(Handler.java:95)
E/AndroidRuntime(16724): at android.os.Looper.loop(Looper.java:211)
E/AndroidRuntime(16724): at android.app.ActivityThread.main(ActivityThread.java:5315)
E/AndroidRuntime(16724): at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(16724): at java.lang.reflect.Method.invoke(Method.java:372)
AndroidRuntime(16724): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:941)
E/AndroidRuntime(16724): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:736)
Will anyone please tell what is the mistake i have done and how can the error be solved.
Thanks in advance.

Your table name mismatches:
private static final String TABLE_NAME = "table_dairy"; // DAIRY?????
and
private static final String TABLE_CREATE="create table table_diary (date text primary key," + "dairy text not null);";
This
return db.insertOrThrow(TABLE_NAME, null, content);
Tries to insert into table_dairy, while you created table_diary.
So, it correctly tells you that table_dairy does not exist.

Values showing are null

i have created a simple app to learn sqlite in android.
But when i click on the showdata button i get null values
MainDB.java
package com.example.logintp;
import java.util.List;
import android.R.layout;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import com.example.logintp.R.id;
public class MainDB extends Activity {
TextView name, password,show1;
EditText etname, etpassword;
Button save,show;
String s1, s2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final DbClass db = new DbClass(this);
name = (TextView) findViewById(R.id.name);
password = (TextView) findViewById(R.id.password);
show1=(TextView) findViewById(R.id.show);
etname = (EditText) findViewById(R.id.etName);
etpassword = (EditText) findViewById(id.etPassword);
save = (Button) findViewById(R.id.save);
show=(Button) findViewById(R.id.Display);
show.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
String data=db.showAll();
show1.setText(data);
}
});
save.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
s1 = etname.getText().toString();
s2 = etpassword.getText().toString();
long id = db.insertData(new Login(s1, s2));
if (id < 0) {
CommonFunctions.display(MainDB.this, "unsucessful");
}else{
CommonFunctions.display(MainDB.this, "sucessful");
}
}
});
}
}
DataBaseHandler Class
package com.example.logintp;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DbClass extends SQLiteOpenHelper {
private static final String db_name="LoginDetails";
private static final String table_name="Login";
private static final String name="name";
private static final String password="password";
private static final int db_version=1;
private static final String Create_Table=" CREATE TABLE " + table_name + "(" +name + " VARCHAR(200)," +password+ " VARCHAR(200)" + " ) ";
public DbClass(Context context){
super(context, db_name, null, db_version);
}
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(Create_Table);
}
#Override
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
// TODO Auto-generated method stub
}
public long insertData(Login l){
SQLiteDatabase db=getWritableDatabase();
ContentValues cv=new ContentValues();
cv.put(name, l.getName());
cv.put(password, l.getPassword());
long id=db.insert(table_name, null, cv);
db.close();
return id;
}
public String showAll(){
String[] coloums= {name , password};
StringBuffer b=new StringBuffer();
SQLiteDatabase db=getWritableDatabase();
Cursor cursor=db.query(table_name, coloums, null, null, null, null, null);
while(cursor.moveToNext()){
//Login login=new Login();
String name1=cursor.getString(0);
String password1=cursor.getString(1);
b.append(name1+" "+password1+ "/n");
}
return b.toString();
}
}
i have created a simple app to learn sqlite in android.
But when i click on the showdata button i get null values

SQLiteAssetHelper and getWritableDatabase

I'm having have some trouble with my Database activity. I am unable to write to the database and view the database using the following code.
my Database activity:
package com.jacob.eindproject;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import java.sql.*;
import com.readystatesoftware.sqliteasset.SQLiteAssetHelper;
public class Database extends SQLiteAssetHelper {
public static final String KEY_PRODUCT = "Product";
public static final String KEY_EENHEID = "Eenheid";
public static final String KEY_KCAL = "Kcal";
private static final String DATABASE_NAME = "Voedsel";
private static final String DATABASE_TABLE = "Voeding";
private static final int DATABASE_VERSION = 1;
private DbHelper ourHelper;
private final Context ourContext;
private SQLiteDatabase ourDatabase;
private static class DbHelper extends SQLiteAssetHelper{
public DbHelper(Context context) {
super(context, DATABASE_NAME, context.getExternalFilesDir(null).getAbsolutePath(), null, DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
}
#Override
public void onUpgrade(SQLiteDatabase Voedsel, int oldVersion, int newVersion) {
Voedsel.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
onCreate(Voedsel);
}
public void close(Database database) {
// TODO Auto-generated method stub
}
public Database(Context c){
ourContext = c;
}
public Database open() throws SQLException{
ourHelper = new DbHelper(ourContext);
ourDatabase = ourHelper.getWritableDatabase();
return this;
}
public void close() {
ourHelper.close();
}
public long createEntry(String product, String kcal, String eenheid) {
ContentValues cv = new ContentValues();
cv.put(KEY_PRODUCT, product);
cv.put(KEY_EENHEID, eenheid);
cv.put(KEY_KCAL, kcal);
return ourDatabase.insert(DATABASE_TABLE, null, cv);
}
public String getData() {
// TODO Auto-generated method stub
String[] columns = new String[]{ KEY_PRODUCT, KEY_EENHEID, KEY_KCAL};
Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null);
String result = "";
int iRow = c.getColumnIndex(KEY_PRODUCT);
int iName = c.getColumnIndex(KEY_EENHEID);
int iHotness = c.getColumnIndex(KEY_KCAL);
for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){
result = result + c.getString(iRow) + " " + c.getString(iName) + " " + c.getString(iHotness) + "\n";
}
return result;
}
}
My SQLView activity:
package com.jacob.eindproject;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class SQLView extends Activity{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sqlview);
TextView tv = (TextView) findViewById(R.id.tvSQLinfo);
Database info = new Database(this);
info.open();
String data = info.getData();
info.close();
tv.setText(data);
}
}
SQLite activity:
package com.jacob.eindproject;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.app.Activity;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.view.View.OnClickListener;
public class SQLite extends Activity implements View.OnClickListener {
Button sqlUpdate, sqlView;
EditText sqlVoeding, sqlKcal, sqlEenheid;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sqllite);
sqlUpdate = (Button) findViewById(R.id.bSQLUpdate);
sqlVoeding = (EditText) findViewById(R.id.etSQLVoeding);
sqlEenheid = (EditText) findViewById(R.id.etSQLEenheid);
sqlKcal = (EditText) findViewById(R.id.etSQLKcal);
sqlView = (Button) findViewById(R.id.bSQLopenView);
sqlView.setOnClickListener((android.view.View.OnClickListener) this);
sqlUpdate.setOnClickListener((android.view.View.OnClickListener) this);
}
public void onClick(View arg0) {
switch (arg0.getId()) {
case R.id.bSQLUpdate:
boolean didItWork = true;
try{
String voeding = sqlVoeding.getText().toString();
String Kcal = sqlKcal.getText().toString();
String eenheid = sqlEenheid.getText().toString();
Database entry = new Database(SQLite.this);
entry.open();
entry.createEntry(voeding, Kcal, eenheid);
entry.close();
}catch (Exception e ){
didItWork = false;
}finally{
if (didItWork){
Dialog d = new Dialog(this);
d.setTitle("Heak Yeay");
TextView tv = new TextView(this);
tv.setText("Succes");
d.setContentView(tv);
d.show();
}
}
break;
case R.id.bSQLopenView:
Intent i = new Intent(this, SQLView.class);
startActivity(i);
}
}
public void onClick(DialogInterface arg0, int arg1) {
// TODO Auto-generated method stub
}
}
I am having my database file(Voedsel.rar), in assets/databases/Voedsel.rar.

To write to your database, try a method like this:
public void insertVoeding(String product, String eenheid, String kcal) {
ourDatabase.execSQL("INSERT INTO Voeding (Product, Eenheid, Kcal) VALUES (?, ?, ?)",
new String[] {product, eenheid, kcal});
}
The question marks are replaced by the values in the string array. Your column names cannot be inserted using the string array, because the execSQL method puts quotation marks around these values. The query will fail if you try.
There are two ways to read from a database (may even be two ways to write to it, too). I personally prefer using raw queries, like this one to get the entire database:
public Cursor getEntireDB() {
return ourDatabase.rawQuery("SELECT * FROM Voeding");
}
You can then use the cursor in a CursorAdapter to create a list.

java.lang.NullPointerException when adding data to sqlite

I am getting Nullpointerexception error when checked rdio4
Codes:
Answerpage.java
package com.example.psikotestproject;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.os.Bundle;
import android.os.Message;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;
public class AnswerPage extends Activity{
#Override
protected void onDestroy() {
super.onDestroy();
}
DbHelper dbhelper;
SQLiteDatabase db;
Context contextim;
int i=1;
int obko=0;
int soma=0;
int kadu=0;
int depr=0;
int foan=0;
static float somahesap=0.0f;
static float obkohesap=0.0f;
static float kaduhesap=0.0f;
static float deprhesap=0.0f;
static float foanhesap=0.0f;
//dizim
final String questions[]={
"Baş ağrısı" ,
"Sinirlilik ya da içinin titremesi",
"Zihinden atamadığınız tekrarlayan, hoşa gitmeyen düşünceler",
"Baygınlık ya da baş dönmesi",
"Cinsel arzu ve ilginin kaybı",
"Başkaları tarafından eleştirilme duygusu",
"Herhangi bir kimsenin düşüncelerinizi kontrol edebileceği
};
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.answerpage);
//component tanımları
final TextView txtquestion=(TextView)findViewById(R.id.txtquestion);
final RadioGroup rdiogroup=(RadioGroup)findViewById(R.id.rdiogroup);
final RadioButton rdio0=(RadioButton)findViewById(R.id.rdio0);
final RadioButton rdio1=(RadioButton)findViewById(R.id.rdio1);
final RadioButton rdio2=(RadioButton)findViewById(R.id.rdio2);
final RadioButton rdio3=(RadioButton)findViewById(R.id.rdio3);
final RadioButton rdio4=(RadioButton)findViewById(R.id.rdio4);
final Button btndigersoru=(Button)findViewById(R.id.btndigersoru);
final Button btnoncekisoru=(Button)findViewById(R.id.btnoncekisoru);
txtquestion.setText(questions[i-1]);
//diğersorubutonclick
btndigersoru.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
if(rdio0.isChecked()||rdio1.isChecked()||rdio2.isChecked()||rdio3.isChecked()||rdio4.isChecked())
{
txtquestion.setText(questions[i]);
if(rdio0.isChecked()==true)
{
dbhelper.addKayitlar(rdiogroup.getCheckedRadioButtonId());
//secili[i]=rdiogroup.getCheckedRadioButtonId();
rdiogroup.clearCheck();
}
if(rdio1.isChecked()==true)
{
if(i==1||i==4||i==12||i==27||i==40||i==42||i==48||i==52||i==53||i==56||i==58)
soma++;
if(i==3||i==9||i==10||i==28||i==38||i==45||i==46||i==51||i==55||i==65)
obko++;
if(i==6||i==21||i==34||i==36||i==37||i==41||i==61||i==69||i==73)
kadu++;
if(i==4||i==5||i==15||i==20||i==22||i==26||i==29||i==30||i==31||i==32||i==54||i==71||i==79)
depr++;
if(i==13||i==25||i==47||i==50||i==70||i==75||i==82)
foan++;
dbhelper.addKayitlar(rdiogroup.getCheckedRadioButtonId());
//secili[i]=rdiogroup.getCheckedRadioButtonId();
rdiogroup.clearCheck();
}
if(rdio2.isChecked()==true)
{
if(i==1||i==4||i==12||i==27||i==40||i==42||i==48||i==52||i==53||i==56||i==58)
soma=soma+2;
if(i==3||i==9||i==10||i==28||i==38||i==45||i==46||i==51||i==55||i==65)
obko=obko+2;
if(i==6||i==21||i==34||i==36||i==37||i==41||i==61||i==69||i==73)
kadu=kadu+2;
if(i==4||i==5||i==15||i==20||i==22||i==26||i==29||i==30||i==31||i==32||i==54||i==71||i==79)
depr=depr+2;
if(i==13||i==25||i==47||i==50||i==70||i==75||i==82)
foan=foan+2;
dbhelper.addKayitlar(rdiogroup.getCheckedRadioButtonId());
//secili[i]=rdiogroup.getCheckedRadioButtonId();
rdiogroup.clearCheck();
}
if(rdio3.isChecked()==true)
{
if(i==1||i==4||i==12||i==27||i==40||i==42||i==48||i==52||i==53||i==56||i==58)
soma=soma+3;
if(i==3||i==9||i==10||i==28||i==38||i==45||i==46||i==51||i==55||i==65)
obko=obko+2;
if(i==6||i==21||i==34||i==36||i==37||i==41||i==61||i==69||i==73)
kadu=kadu+2;
if(i==4||i==5||i==15||i==20||i==22||i==26||i==29||i==30||i==31||i==32||i==54||i==71||i==79)
depr=depr+2;
if(i==13||i==25||i==47||i==50||i==70||i==75||i==82)
foan=foan+3;
dbhelper.addKayitlar(rdiogroup.getCheckedRadioButtonId());
//secili[i]=rdiogroup.getCheckedRadioButtonId();
rdiogroup.clearCheck();
}
if(rdio4.isChecked()==true)
{
if(i==1||i==4||i==12||i==27||i==40||i==42||i==48||i==52||i==53||i==56||i==58)
soma=soma+4;
if(i==3||i==9||i==10||i==28||i==38||i==45||i==46||i==51||i==55||i==65)
obko=obko+4;
if(i==6||i==21||i==34||i==36||i==37||i==41||i==61||i==69||i==73)
kadu=kadu+4;
if(i==4||i==5||i==15||i==20||i==22||i==26||i==29||i==30||i==31||i==32||i==54||i==71||i==79)
depr=depr+4;
if(i==13||i==25||i==47||i==50||i==70||i==75||i==82)
foan=foan+4;
dbhelper.addKayitlar(rdiogroup.getCheckedRadioButtonId());
//secili[i]=rdiogroup.getCheckedRadioButtonId();
rdiogroup.clearCheck();
}
}
if(i<16)
i++;
else{}
if(i>1)
{
btnoncekisoru.setVisibility(View.VISIBLE);
}
if(i>=9)
//if(i>=90)
{
//En son hesaplar
somahesap=(float) (soma/11.0);
obkohesap=(float) (obko/10.0);
kaduhesap=(float) (kadu/9.0);
deprhesap=(float) (depr/13.0);
foanhesap=(float) (foan/7.0);
Intent finishingActivity=new Intent("com.example.psikotestproject.RESULTPAGE");
startActivity(finishingActivity);
}
}
});
//btnoncekibutonclick
btnoncekisoru.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
rdiogroup.clearCheck();
dbhelper.getKayitlar(i-1);
txtquestion.setText(questions[i-1]);
i--;
//rdiogroup.check(secili[i]);
if(i<=0)
{
btnoncekisoru.setVisibility(View.INVISIBLE);
}
}
});
}
Dbhelper.java
public class DbHelper extends SQLiteOpenHelper {
// Tüm Static değişkenler
// Database Versiyonu
private static final int DATABASE_VERSION = 1;
// Database Adı
private static final String DATABASE_NAME = "dbSecimler";
// Kayitlar Tablosunun Adı
private static final String TABLE_NAME = "Secimler";
// Kayitlar Tablosunun Kolon Adları
private static final String KEY_CEVAP = "Cevaplar";
// Yapılandırıcı metod
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Database Oluşturma işlemi.
#Override
public void onCreate(SQLiteDatabase db) {
String create_table = "CREATE TABLE " + TABLE_NAME + "(id INTEGER PRİMARY KEY AUTOINCREMENT"
+ KEY_CEVAP + " INTEGER," + ")";
db.execSQL(create_table);
}
// Database Yükseltme işlemi.
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Varsa şayet eski tabloyu sil.
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
// Tekrar tablo oluştur.
onCreate(db);
}
// Yeni Kayıt Eklemek.
void addKayitlar(int i) {
SQLiteDatabase db= this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_CEVAP, i);
// Ekleme işlemi...
db.insert(TABLE_NAME, null , values);
db.close(); // Açık olan database i kapat.
}
//İstenilen Kaydı Getirmek.
Kayitlar getKayitlar(int i) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_NAME, new String[] {KEY_CEVAP},null, null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
Kayitlar kayit = new Kayitlar(Integer.parseInt(cursor.getString(1)));
// return Kayitlar
return kayit;
}
}
Errors on LogCat
threadid=1: thread exiting with uncaught exception (group=0x4001d800)
FATAL EXCEPTION: main
java.lang.NullPointerExceptionat com.example.psikotestproject.AnswerPage$1.onClick(AnswerPage.java:282)
-
-
-
and 282 is: dbhelper.addKayitlar(rdiogroup.getCheckedRadioButtonId());
rdiogroup.getCheckedRadioButtonId() not null I'm sure.I think I have an error about saving database.What can I solve?

It seems that you are missing findViewById() for the view for which you have implemented onClickListener.

android null pointer while using SQLITE

i am trying to implement an app in which text entered in edittext is saved to the DB and then is displayed in a text field. But the app is crashing when i try to do this and i get a null pointer exception. This is my code
package com.example.dbex;
import java.sql.SQLOutput;
import java.sql.SQLPermission;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
public class DBHandler extends SQLiteOpenHelper {
public static final int DATABASE_VERSION=1;
public static final String DATABASE_NAME="contactsmanager";
public static final String TABLE_CONTACTS="contacts";
public static final String KEY_ID="id";
public static final String KEY_NAME="name";
public static final String KEY_NUMBER="number";
public DBHandler(Context context) {
super(context,DATABASE_NAME, null, DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
#Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
String CREATE_TABLE_CONTACTS="CREATE TABLE "+TABLE_CONTACTS+"("+KEY_ID+" INTEGER PRIMARY KEY,"+KEY_NAME+" TEXT,"+KEY_NUMBER+" TEXT"+")";
db.execSQL(CREATE_TABLE_CONTACTS);
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS "+TABLE_CONTACTS);
onCreate(db);
}
public void addContact(Contacts contacts)
{
SQLiteDatabase db=this.getWritableDatabase();
ContentValues values=new ContentValues();
values.put(KEY_NAME, contacts.getname());
values.put(KEY_NUMBER, contacts.getnumber());
db.insert(TABLE_CONTACTS,null,values);
db.close();
}
public Contacts getContact(int id)
{
SQLiteDatabase db=this.getReadableDatabase();
Cursor c=db.query(TABLE_CONTACTS, new String[]{KEY_ID,KEY_NAME,KEY_NUMBER},KEY_ID+" =?",new String[]{String.valueOf(id)}, null, null, null, null);
Contacts contacts=null;
if(c!=null&&c.moveToFirst())
{
contacts=new Contacts(Integer.parseInt(c.getString(0)),c.getString(1),c.getString(2));
}
return contacts;
}
public void deleteContact(Contacts contacts)
{
SQLiteDatabase db=this.getWritableDatabase();
db.delete(TABLE_CONTACTS, KEY_ID+" =?", new String[]{String.valueOf(contacts.getID())});
db.close();
}
}
and the main activity is
package com.example.dbex;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button b1=(Button)findViewById(R.id.button1);
EditText et1=(EditText)findViewById(R.id.editText1);
EditText et2=(EditText)findViewById(R.id.editText2);
final TextView tv1=(TextView)findViewById(R.id.textView1);
final String _name=et1.getText().toString();
final String _phone=et2.getText().toString();
final DBHandler dbh=new DBHandler(getBaseContext());
b1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
dbh.addContact(new Contacts(_name, _phone));
String contact1=(dbh.getContact(0)).getname();
tv1.setText(contact1);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
i am getting the null pointer exception in the line
String contact1=(dbh.getContact(0)).getname();
where is my mistake?
thanks

Since you are telling you are able to insert the value, I assume your DB creation is correct You have hardcoded the id being queried to 0. You may not be having any value here. See this post to understand that even when you delete existing rows the auto increment ID could be continuing from the last used value instead of 0. So you could be returning a null value in this part of your code:
Contacts contacts=null;
if(c!=null&&c.moveToFirst())
{
contacts=new Contacts(Integer.parseInt(c.getString(0)),c.getString(1),c.getString(2));
}
return contacts;