Develop Reference

How to show multiple data from SQLite database inside ListView in Android

I am a newcomer to Android development.
I can't figure out how to get Android Studio to just take what's in my SQLite database and paste its contents into a listview. I thought there would be a easy way after Log the output but can able to display everything there is in a database in a ListView but it appears to be much more in a different way of doing it.
public class MainActivity extends AppCompatActivity {
EditText nameEditText;
EditText phoneEditText;
ListView updateListView;
SQLiteDatabase sqLiteDatabase;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
nameEditText = findViewById(R.id.nameEditText);
phoneEditText = findViewById(R.id.phoneEditText);
updateListView = findViewById(R.id.updatedListView);
sqLiteDatabase = this.openOrCreateDatabase("Contact", MODE_PRIVATE, null);
sqLiteDatabase.execSQL("CREATE TABLE IF NOT EXISTS users(name VARCHAR, phone INT(11),id INTEGER PRIMARY KEY)");
}
public void OnClick(View view) {
if (nameEditText.equals("") || phoneEditText.equals("")) {
Toast.makeText(this, "Fields shouldn't be empty", Toast.LENGTH_SHORT).show();
} else {
sqLiteDatabase.execSQL("INSERT INTO users(name, phone) VALUES('" + nameEditText.getText().toString() + "','" + phoneEditText.getText().toString() + "')");
Cursor c = sqLiteDatabase.rawQuery("SELECT * FROM users", null);
int nameIndex = c.getColumnIndex("name");
int phoneIndex = c.getColumnIndex("phone");
int idIndex = c.getColumnIndex("id");
if (c != null && c.getCount() > 0) {
c.moveToFirst();
for (int i = 0; i < c.getCount(); i++) {
String str = c.getString(0);
String UpdatedList = (c.getString(nameIndex));
String phonelist = (c.getString(phoneIndex));
String list = (UpdatedList+phonelist);
ArrayList<String> arrayList = new ArrayList<String>(Integer.parseInt(list));
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_list_item_1,arrayList);
updateListView.setAdapter(arrayAdapter);
Log.i("User Name", c.getString(nameIndex));
Log.i("userResults - age", Integer.toString(c.getInt(phoneIndex)));
Log.i("userResults - id", Integer.toString(c.getInt(idIndex)));
c.moveToNext();
}
}
}
}
}
My Logput
2020-01-22 20:22:48.353 28783-28783/? D/AndroidRuntime: Shutting down VM
2020-01-22 20:22:48.357 28783-28783/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.mysqlapp, PID: 28783
java.lang.IllegalStateException: Could not execute method for android:onClick
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:390)
at android.view.View.performClick(View.java:6669)
at android.view.View.performClickInternal(View.java:6638)
at android.view.View.access$3100(View.java:789)
at android.view.View$PerformClick.run(View.java:26145)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6898)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:537)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:385)
at android.view.View.performClick(View.java:6669) 
at android.view.View.performClickInternal(View.java:6638) 
at android.view.View.access$3100(View.java:789) 
at android.view.View$PerformClick.run(View.java:26145) 
at android.os.Handler.handleCallback(Handler.java:873) 
at android.os.Handler.dispatchMessage(Handler.java:99) 
at android.os.Looper.loop(Looper.java:193) 
at android.app.ActivityThread.main(ActivityThread.java:6898) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:537) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 
Caused by: java.lang.NumberFormatException: For input string: ""
at java.lang.Integer.parseInt(Integer.java:627)
at java.lang.Integer.parseInt(Integer.java:650)
at com.example.mysqlapp.MainActivity.OnClick(MainActivity.java:65)

call setAdapter method outside, after you declare whole arrayList from sql, outside of for loop

android - ' android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0'

i want to get two column from my SQLite DB and return it like Arraylist<myObjectModel> but i faced this error
05-12 03:31:37.763 15166-15166/com.example.abdullah.newstroynory E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.abdullah.newstroynory, PID: 15166
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.abdullah.newstroynory/com.example.abdullah.newstroynory.MainActivity}: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2778)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
at android.database.AbstractCursor.checkPosition(AbstractCursor.java:468)
at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:136)
at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:50)
at com.example.abdullah.newstroynory.SQLForMyStroies.getTitleAndImage(SQLForMyStroies.java:58)
at com.example.abdullah.newstroynory.MainActivity.onCreate(MainActivity.java:75)
My error
com.example.abdullah.newstroynory.SQLForMyStroies.getTitleAndImage(SQLForMyStroies.java:58)
start in this line in my SQlite class
forDoing.setTitle(cursor.getString(cursor.getColumnIndex("story_title")));
My SQLiteOpenHelper class
public class SQLForMyStroies extends SQLiteOpenHelper {
private static final int DB_VERSION = 1;
private static final String DB_NAME = "newStoryNory5";
public SQLForMyStroies(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
#Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE stories (story_id INTEGER PRIMARY KEY AUTOINCREMENT,story_title VARCHAR,story_image VARCHAR,story_body VARCHAR,story_audio VARCHAR )");
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS stories");
onCreate(db);
}
public boolean CreateNewStory( String t, String i, String b){
SQLiteDatabase db= this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("story_title" , t);
contentValues.put("story_image" , i);
contentValues.put("story_body" , b);
// contentValues.put("story_audio" , a);
db.insert("stories",null,contentValues);
return true;
}
public ArrayList<StoryModel> getTitleAndImage(){
ArrayList<StoryModel> myData = new ArrayList <> ();
SQLiteDatabase db= this.getReadableDatabase();
Cursor cursor =db.rawQuery("SELECT * FROM stories ",null);
cursor.moveToFirst();
do {
StoryModel forDoing=new StoryModel();
forDoing.setTitle(cursor.getString(cursor.getColumnIndex("story_title")));
forDoing.setImage(cursor.getString(cursor.getColumnIndex("story_image")));
myData.add(forDoing);
}while (cursor.moveToNext());
cursor.close();
db.close();
return(myData);
}
My MainActivity class
ArrayList<StoryModel> TitleAndImage =mySQL.getTitleAndImage();
for (StoryModel storyModel : TitleAndImage) {
Log.d("story_title", storyModel.getTitle());
Log.d("story_image", storyModel.getImage());
}
i think it's logical error in java code!
can you correct me please!
i'm new in android and not familiar in java

the Error was because my DB SQlite empty because every time i run the App it's make a new DB for me ...
solution
so I deleted all my DB SQLite and I put condition,
my condition is " if there is data in my DB SQLite don't take data from internt"
My MainActivity
if(mySQL.checktitle (storyObject.getTitle().toString())) {
Log.d("--------------------", "data is exist ");
break;
}
My SQLiteOpenHelper class
public boolean checktitle ( String title){
SQLiteDatabase db= this.getWritableDatabase();
Cursor cur = db.rawQuery("SELECT * FROM stories where story_title='"+title+"'" ,null);
if(cur.getCount()>0)
return true;
return false;
}

Sqlite in android studio 2.2

I am getting error in writing query get error at DESC in function getfood.Here is my exception.
Exception:
beginning of crash
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.app.caloriescounter.admin.caloriescounter, PID: 2759
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.app.caloriescounter.admin.caloriescounter/com.app.caloriesc
ounter.admin.caloriescounter.Main2Activity}:
java.lang.IllegalArgumentException: **invalid LIMIT clauses: DESC**
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at
android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.IllegalArgumentException: invalid LIMIT clauses: DESC
at
android.database.sqlite.SQLiteQueryBuilder.buildQueryString(SQLiteQueryBuilde
r.java:209)
at
android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1160)
at
android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1034)
at
android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1240)
at
data.Databasehandler.getfood(Databasehandler.java:86)
at
com.app.caloriescounter.admin.caloriescounter.Main2Activity.refreshdata(Main2Activity.java:38)
at com.app.caloriescounter.admin.caloriescounter.Main2Activity.onCreate(Main2Activity.java:32)
at android.app.Activity.performCreate(Activity.java:6237)
at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
at android.app.ActivityThread.-
wrap11(ActivityThread.java) 
at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
at
android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:148) 
at
android.app.ActivityThread.main(ActivityThread.java:5417) 
this is my Source Code: of Databasehandler class.
package data;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import java.text.DateFormat;
import java.util.ArrayList;
import java.util.Date;
import model.Food;
/**
* Created by Admin on 9/10/2016.
*/
public class Databasehandler extends SQLiteOpenHelper {
private static final String LOGCAT = null;
private final ArrayList<Food> foodArrayList=new ArrayList<>();
public Databasehandler(Context context) {
super(context,Constsnts.databasename,null,Constsnts.databaseversion);
Log.d(LOGCAT,"Database Created");
}
#Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
String Crete_Table="CREATE TABLE "+ Constsnts.food_table+" ( " +
Constsnts.KeyId +"INTEGER PRIMARY KEY, " + Constsnts.food_name +"TEXT, "
+Constsnts.foodcalories +"INT , "+Constsnts.datename +"LONG );";
sqLiteDatabase.execSQL(Crete_Table);
}
#Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {
sqLiteDatabase.execSQL("DROP TABLE IF EXISTS "+Constsnts.food_table);
//new one
onCreate(sqLiteDatabase);
}
//item all
public int getTotalitem(){
int totalitem=0;
String query=" SELECT * FROM "+Constsnts.food_table;
SQLiteDatabase db=this.getReadableDatabase();
Cursor cursor=db.rawQuery(query,null);
totalitem=cursor.getCount();
cursor.close();
return totalitem;
}
public int Caloriesall(){
int calories=0;
String query="SELECT SUM ( "+Constsnts.foodcalories +")"+"FROM
"+Constsnts.food_table;
SQLiteDatabase db=this.getReadableDatabase();
Cursor cursor=db.rawQuery(query,null);
if(cursor.moveToNext()){
calories=cursor.getInt(0);
}
cursor.close();
db.close();
return calories;
}
//deletefood
public void deletefood(int id){
SQLiteDatabase db=this.getWritableDatabase();
db.delete(Constsnts.food_table,Constsnts.KeyId+" =? ",new String[]
{String.valueOf(id)});
db.close();
}
//add food
public void addfood(Food food){
SQLiteDatabase db=this.getWritableDatabase();
ContentValues values=new ContentValues();
values.put(Constsnts.food_name,food.getFoodname());
values.put(Constsnts.foodcalories,food.getCaleries());
values.put(Constsnts.datename,System.currentTimeMillis());
db.insert(Constsnts.food_table,null,values);
Log.v("Added food item","yess");
db.close();
}
//get all food
public ArrayList<Food> getfood(){
foodArrayList.clear();
SQLiteDatabase db=this.getReadableDatabase();
Cursor cursor=db.query(Constsnts.food_table,new String[]
{Constsnts.KeyId,Constsnts.databasename,
Constsnts.foodcalories,Constsnts.datename},null,null,null,null,Constsnts.datename," DESC ");
if(cursor.moveToFirst()){
do {
Food food=new Food();
food.setFoodname(cursor.getString(cursor.getColumnIndex(Constsnts.food_name)));
food.setCaleries(cursor.getInt(cursor.getColumnIndex(Constsnts.foodcalories)));
food.setFoodid(cursor.getInt(cursor.getColumnIndex(Constsnts.KeyId)));
DateFormat dateFormat=DateFormat.getDateInstance();
String data=dateFormat.format(new
Date(cursor.getLong(cursor.getColumnIndex(Constsnts.datename))).getTime());
food.setRecorddate(data);
foodArrayList.add(food);
}while(cursor.moveToNext());
}
cursor.close();
db.close();
return foodArrayList;
}
}
Thanks in advance.

Cursor cursor=db.query(...,Constsnts.datename," DESC ");
The DESC must be part of the ORDER BY clause. You have put it into the next parameter, which makes it end up in the LIMIT clause.
You have to put the column name and the DESC into the same parameter:
Cursor cursor=db.query(...,Constsnts.datename+" DESC");

SQL Database Error : Table has no column name

I've gone through a lot of the forum answers and usually the problem is not
adding a "," or a space where it should be, that will change the SQL statement into something it's not supposed to be.
I tried taking a look at mine and I still can't find the error in my onCreate. And I use Genymotion to emulate the app each time so it can't be that the emulator has a previous database version, so it shouldn't be a problem with the onUpgrade method.
Here's the logcat
09-19 07:54:26.137 7344-7344/com.example.cartermah.mywishlist E/SQLiteLog﹕ (1) table wishes has no column named content
09-19 07:54:26.137 7344-7344/com.example.cartermah.mywishlist E/SQLiteDatabase﹕ Error inserting content=jalksjldk title=HIHI recorddate=1442663666139
android.database.sqlite.SQLiteException: table wishes has no column named content (code 1): , while compiling: INSERT INTO wishes(content,title,recorddate) VALUES (?,?,?)
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1467)
at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1339)
at data.DatabaseHandler.addWishes(DatabaseHandler.java:67)
at com.example.cartermah.mywishlist.MainActivity.saveToDB(MainActivity.java:53)
at com.example.cartermah.mywishlist.MainActivity.access$000(MainActivity.java:15)
at com.example.cartermah.mywishlist.MainActivity$1.onClick(MainActivity.java:36)
at android.view.View.performClick(View.java:4240)
at android.view.View$PerformClick.run(View.java:17721)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
09-19 07:54:26.137 7344-7344/com.example.cartermah.mywishlist V/Wished saved!﹕ yeah
And the database handler code is
package data;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import android.widget.Toast;
import com.example.cartermah.mywishlist.MainActivity;
import java.sql.Date;
import java.util.ArrayList;
import model.MyWish;
/**
* Created by CarterMah on 14/09/2015.
*/
public class DatabaseHandler extends SQLiteOpenHelper {
public final ArrayList<MyWish> wishList = new ArrayList<>();
public DatabaseHandler(Context context) {
super(context, Constants.DATABASE_NAME, null, Constants.DATABASE_VERSION );
}
#Override
public void onCreate(SQLiteDatabase db) {
//This is where the table is created
String CREATE_WISHES_TABLE = "CREATE TABLE " + Constants.TABLE_NAME + "(" + Constants.KEY_ID +
" INTEGER PRIMARY KEY, " + Constants.TITLE_NAME + " TEXT, " + Constants.CONTENT_NAME +
" TEXT, " + Constants.DATE_NAME + " LONG" + ");";
db.execSQL(CREATE_WISHES_TABLE);
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + Constants.TABLE_NAME);
//Create a new table
onCreate(db);
}
public void addWishes (MyWish wish) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(Constants.TITLE_NAME, wish.getTitle());
values.put(Constants.CONTENT_NAME, wish.getContent());
values.put(Constants.DATE_NAME, java.lang.System.currentTimeMillis());
db.insert(Constants.TABLE_NAME, null, values);
Log.v("Wished saved!","yeah");
db.close();
}
// Get all wishes
public ArrayList<MyWish> getWishes() {
String selectQuery = "SELECT * FROM " + Constants.TABLE_NAME;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(Constants.TABLE_NAME, new String[]{Constants.KEY_ID,
Constants.TITLE_NAME, Constants.CONTENT_NAME, Constants.DATE_NAME,},
null, null, null, null, Constants.DATE_NAME + " DESC");
// loop through cursor to get every row of data
if (cursor.moveToFirst()) {
do{
MyWish wish = new MyWish();
wish.setTitle(cursor.getString(cursor.getColumnIndex(Constants.TITLE_NAME)));
wish.setContent(cursor.getString(cursor.getColumnIndex(Constants.CONTENT_NAME)));
java.text.DateFormat dateFormat = java.text.DateFormat.getDateInstance();
String dataData = dateFormat.format(new Date(cursor.getLong(cursor.getColumnIndex(Constants.DATE_NAME))).getTime());
wish.setRecordDate(dataData);
wishList.add(wish);
}while (cursor.moveToNext());
}
return wishList;
}
}
Constants.java
public class Constants {
public static final String DATABASE_NAME = "wishdb";
public static final int DATABASE_VERSION = 1;
public static final String TABLE_NAME = "wishes";
public static final String TITLE_NAME = "title";
public static final String CONTENT_NAME = "content";
public static final String DATE_NAME = "recorddate";
public static final String KEY_ID = "_id";
}
MainActivity
package com.example.cartermah.mywishlist;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import data.DatabaseHandler;
import model.MyWish;
public class MainActivity extends AppCompatActivity {
private EditText title;
private EditText content;
private Button saveButton;
private DatabaseHandler dba;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dba = new DatabaseHandler(MainActivity.this);
title = (EditText)findViewById(R.id.titleEditText);
content = (EditText)findViewById(R.id.wishEditText);
saveButton = (Button)findViewById(R.id.saveButton);
saveButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
saveToDB();
}
});
}
private void saveToDB() {
MyWish wish = new MyWish();
wish.setTitle(title.getText().toString().trim());
wish.setContent(content.getText().toString().trim());
dba.addWishes(wish);
dba.close();
// clear the form once users click the save button.
title.setText("");
content.setText("");
// Intent i = new Intent(MainActivity.this, WishDetailActivity.class);
// startActivity(i);
}
}

You need to add id when you insert because id is not autoincrement.OR make id autoincrement.

You mention using Genymotion as a reason an existing DB wouldn't be a problem but I don't think that's an accurate assumption. Unless you are completely uninstalling the app before you launch the new one the previous database version is still on the device and won't be overriden. I would recommend completely uninstalling the app from Genymotion and then install it with the latest onCreate statement and see if a fresh install would overwrite any possible occurrence of a previous database version.

I got into the same problems, but All I've done is just to uninstall the apps and reinstall again, it's worked perfectly.

Null Pointer Exception : coudnt find solution

I am getting error in my code which is not understandable.. please help me find out what issue is it.
i have database class and main activity.. it shows in log but when it comes to appear at my emulator's screen it gives me error.
my database class:
package com.example.nearby_places;
import java.util.ArrayList;
import java.util.List;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class Database extends SQLiteOpenHelper {
//database name & version number
private static final String db_name = "nearby_places";
private static final int db_version = 1;
//tables
private static final String table_placetypes = "placetypes";
private static final String table_places = "table_places";
//column names
private static final String type_id = "type_id";
private static final String type_name = "type_name";
private static final String place_id = "place_id";
private static final String place_name = "place_name";
private static final String place_address = "place_address";
private static final String place_contact = "place_contact";
public Database(Context context) {
super(context, db_name, null, db_version);
// TODO Auto-generated constructor stub
}
// create table queries
String create_table_placetypes = "CREATE TABLE IF NOT EXISTS " + table_placetypes + "("
+ type_id + " INTEGER PRIMARY KEY NOT NULL," + type_name + " TEXT" + ")";
String create_table_places = "CREATE TABLE IF NOT EXISTS table_places (place_id INTEGER PRIMARY KEY NOT NULL, place_name TEXT, place_address TEXT, place_contact TEXT, type_id INTEGER, FOREIGN KEY (type_id) REFERENCES table_placetypes(type_id))";
#Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(create_table_placetypes);
Log.d("creating", "placetypes created");
db.execSQL(create_table_places);
Log.d("creating", "places created");
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + table_placetypes);
db.execSQL("DROP TABLE IF EXISTS " + table_places);
onCreate(db);
}
// add placetypes
void addplacetypes (placetypes pt) {
SQLiteDatabase db = getWritableDatabase();
ContentValues values = new ContentValues();
values.put(type_name, pt.getTypename());
db.insert(table_placetypes, null, values);
db.close();
}
// Getting single placetypes
placetypes getPlacetypes(int id) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(table_placetypes, new String[] {type_id,
type_name }, type_id + "=?",
new String[] { String.valueOf(id) }, null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
placetypes pt = new placetypes(Integer.parseInt(cursor.getString(0)),
cursor.getString(1));
// return contact
return pt;
}
// Getting All placetypes
public List<placetypes> getAllPlacetypes() {
List<placetypes> placetypesList = new ArrayList<placetypes>();
// Select All Query
String selectQuery = "SELECT * FROM " + table_placetypes;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
placetypes pt = new placetypes();
pt.setTypeid(Integer.parseInt(cursor.getString(0)));
pt.setTypename(cursor.getString(1));
//String name = cursor.getString(1);
//MainActivity.ArrayofName.add(name);
// Adding contact to list
placetypesList.add(pt);
} while (cursor.moveToNext());
}
// return placetype list
return placetypesList;
}
// Getting placetypes Count
public int getPlacetypesCount() {
String countQuery = "SELECT * FROM " + table_placetypes;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
cursor.close();
// return count
return cursor.getCount();
}
public void addplaces(places p) {
SQLiteDatabase db = getWritableDatabase();
ContentValues values = new ContentValues();
values.put(place_name, p.getPlace_name());
values.put(place_address, p.getPlace_address());
values.put(place_contact, p.getPlace_contact());
values.put(type_id, p.getT_id());
Log.d("Type ID", String.valueOf(p.getT_id()));
db.insert(table_places, null, values);
db.close();
}
places getPlaces(int pid) {
SQLiteDatabase db = getReadableDatabase();
Cursor cursor = db.query(table_places, new String[] {place_id, place_name, place_address, place_contact,type_id}, place_id + "=?", new String[] { String.valueOf(pid) } , null, null, null, null);
if(cursor != null)
cursor.moveToFirst();
places p = new places(Integer.parseInt(cursor.getString(0)),
Integer.parseInt(cursor.getString(1)),
cursor.getString(2),
cursor.getString(3),
cursor.getString(4)
);
cursor.close();
return p;
}
public List<places> getAllPlaces(String typeName) {
List<places> placeList = new ArrayList<places>();
//String selectQuery = "SELECT * FROM table_places INNER JOIN placetypes ON placetypes.type_id=table_places.type_id ";
//String selectQuery = "SELECT * FROM table_places WHERE table_places.type_id="+Integer.toString(typeid);
String selectQuery ="SELECT * FROM table_places WHERE placetypes.place_name="+typeName+" INNER JOIN placetypes ON placetypes.type_id=table_places.type_id";
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
if(cursor.moveToFirst() )
{
do{
places p = new places();
/*p.setT_id(cursor.getColumnIndex(type_id));
p.setPlace_id(cursor.getColumnIndex(place_id));
p.setPlace_name(cursor.getColumnIndex(place_name));
*/
p.setT_id(cursor.getInt(0));
p.setPlace_id(cursor.getInt(1));
p.setPlace_name(cursor.getString(2));
p.setPlace_address(cursor.getString(3));
p.setPlace_contact(cursor.getString(4));
/*String t_id = cursor.getString(4);
String p_name = cursor.getString(2);
String p_address = cursor.getString(3);
String p_contact = cursor.getString(1);*/
placeList.add(p);
}while(cursor.moveToNext());
}
cursor.close();
return placeList;
}
public int getPlaceCount () {
String selectQuery = "SELECT * FROM " +table_places;
SQLiteDatabase db = getReadableDatabase();
Cursor cursor = db.rawQuery(create_table_places, null);
cursor.close();
return cursor.getCount();
}
}
MainActivity
package com.example.nearby_places;
import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class MainActivity extends Activity {
private ListView listView;
public static ArrayList<String> ArrayofName = new ArrayList<String>();
public static final String PLACETYPE = "com.example";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Database db = new Database(this);
if(db.getAllPlacetypes().isEmpty())
{
/**
* CRUD Operations
* */
// Inserting Places
Log.d("Insert: ", "Inserting ..");
db.addplacetypes(new placetypes("RESTURAUNTS"));
db.addplacetypes(new placetypes("MALLS"));
db.addplacetypes(new placetypes("GAS STATIONS"));
db.addplacetypes(new placetypes("HOTELS"));
db.addplacetypes(new placetypes("MOTELS"));
}
// Reading all Places
Log.d("Reading: ", "Reading all placetypes..");
if(ArrayofName.isEmpty())
{
List<placetypes> placetypes = db.getAllPlacetypes();
for (placetypes pt : placetypes)
{
String log = "Id: "+pt.getTypeid()+" ,Name: " + pt.getTypename();
// Writing Places to log
Log.d("Name: ", log);
System.out.println(log);
ArrayofName.add(pt.getTypename());
}
}
listView = (ListView) findViewById(R.id.listView1);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, ArrayofName);
int pos = listView.getAdapter().getCount() -1;
listView.getAdapter().getItemId(pos);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new OnItemClickListener()
{
public void onItemClick(AdapterView<?> parent, View v, int position, long id)
{
String type = ((TextView) v).getText().toString();
Toast.makeText(getApplicationContext(), type, Toast.LENGTH_SHORT).show();
Intent i = new Intent(getApplicationContext(),MainActivity2.class);
i.putExtra(PLACETYPE, type);
startActivity(i);
/*Cursor cursor = (Cursor) parent.getItemAtPosition(position);
Toast.makeText(getApplicationContext(), "id: " +id+ "position: " +position+ "row id: " +(cursor.getColumnIndex("" +
"")), Toast.LENGTH_LONG).show();
*/
Intent intent = new Intent(MainActivity.this, MainActivity2.class);
startActivity(intent);
}
}
);
}
}
Logcat
10-11 17:21:51.871: D/Reading:(4932): Reading all placetypes..
10-11 17:21:51.871: D/Name:(4932): Id: 1 ,Name: RESTURAUNTS
10-11 17:21:51.875: I/System.out(4932): Id: 1 ,Name: RESTURAUNTS
10-11 17:21:51.875: D/Name:(4932): Id: 2 ,Name: MALLS
10-11 17:21:51.875: I/System.out(4932): Id: 2 ,Name: MALLS
10-11 17:21:51.875: D/Name:(4932): Id: 3 ,Name: GAS STATIONS
10-11 17:21:51.875: I/System.out(4932): Id: 3 ,Name: GAS STATIONS
10-11 17:21:51.875: D/Name:(4932): Id: 4 ,Name: HOTELS
10-11 17:21:51.875: I/System.out(4932): Id: 4 ,Name: HOTELS
10-11 17:21:51.875: D/Name:(4932): Id: 5 ,Name: MOTELS
10-11 17:21:51.875: I/System.out(4932): Id: 5 ,Name: MOTELS
10-11 17:21:51.887: D/AndroidRuntime(4932): Shutting down VM
10-11 17:21:51.887: W/dalvikvm(4932): threadid=1: thread exiting with uncaught exception (group=0x41c77300)
10-11 17:21:51.894: E/AndroidRuntime(4932): FATAL EXCEPTION: main
10-11 17:21:51.894: E/AndroidRuntime(4932): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.nearby_places/com.example.nearby_places.MainActivity}: java.lang.NullPointerException
10-11 17:21:51.894: E/AndroidRuntime(4932): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
10-11 17:21:51.894: E/AndroidRuntime(4932): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
10-11 17:21:51.894: E/AndroidRuntime(4932): at android.app.ActivityThread.access$600(ActivityThread.java:130)
10-11 17:21:51.894: E/AndroidRuntime(4932): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
10-11 17:21:51.894: E/AndroidRuntime(4932): at android.os.Handler.dispatchMessage(Handler.java:99)
10-11 17:21:51.894: E/AndroidRuntime(4932): at android.os.Looper.loop(Looper.java:137)
10-11 17:21:51.894: E/AndroidRuntime(4932): at android.app.ActivityThread.main(ActivityThread.java:4745)
10-11 17:21:51.894: E/AndroidRuntime(4932): at java.lang.reflect.Method.invokeNative(Native Method)
10-11 17:21:51.894: E/AndroidRuntime(4932): at java.lang.reflect.Method.invoke(Method.java:511)
10-11 17:21:51.894: E/AndroidRuntime(4932): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
10-11 17:21:51.894: E/AndroidRuntime(4932): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-11 17:21:51.894: E/AndroidRuntime(4932): at dalvik.system.NativeStart.main(Native Method)
10-11 17:21:51.894: E/AndroidRuntime(4932): Caused by: java.lang.NullPointerException
10-11 17:21:51.894: E/AndroidRuntime(4932): at com.example.nearby_places.MainActivity.onCreate(MainActivity.java:62)
10-11 17:21:51.894: E/AndroidRuntime(4932): at android.app.Activity.performCreate(Activity.java:5008)
10-11 17:21:51.894: E/AndroidRuntime(4932): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
10-11 17:21:51.894: E/AndroidRuntime(4932): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
10-11 17:21:51.894: E/AndroidRuntime(4932): ... 11 more
10-11 17:21:53.695: I/Process(4932): Sending signal. PID: 4932 SIG: 9

Your call to getAdapter is returning null because you're calling it before setAdapter, try this instead :
listView.setAdapter(adapter);
int pos = listView.getAdapter().getCount() -1;
listView.getAdapter().getItemId(pos);

If you have a NULLPOINTER Exception please have a deep look at your LogCat. Especial at the Line where it says Caused by.
Learn how to read and use your LogCat, and try to find the Line where it mentions your class/package name and analyse this line.
Caused by: java.lang.NullPointerException
10-11 17:21:51.894: E/AndroidRuntime(4932): at com.example.nearby_places.MainActivity.onCreate(MainActivity.java:62)

The problem is in
List<placetypes> placetypes = db.getAllPlacetypes();
The query you are using is wrong. It should be
`SELECT * FROM table_places INNER JOIN placetypes ON placetypes.type_id=table_places.type_id WHERE placetypes.place_name="+typeName+`"