Develop Reference

Unsorted saving of data from php to sqlite

I am saving receiving data from external server. Now, this is the sample data that I am receiving:
Now what happens is that when I save them to mysqlite db, it doesn't the follow the order of id, Here's the sample of it:
Here's my code for fetching data:
private class getData extends AsyncTask<Void, Void, Void> {
#Override
protected Void doInBackground(Void... params) {
Http sh = new Http();
try {
String URLS = "http://localhost/sample.php?date="+datePHP+"&gametype="+gamePHP+"&time="+timePHP+"&bettype="+typePHP;
String jsonStr = sh.makeServiceCall(URLS);
if(jsonStr != null){
JSONObject jsonObj = new JSONObject(jsonStr);
JSONArray sims = (JSONArray)jsonObj.get("mmi");
for (int i = 0; i < sims.length(); i++) {
JSONObject c = sims.getJSONObject(i);
String betid = c.getString("id");
String betnumber = c.getString("betnumber");
String betamount = c.getString("betamount");
boolean insertBets = databaseHelper.addBets(betid, betnumber, betamount, timePHP, datePHP,gamePHP,typePHP);
if (insertBets){
System.out.println("SAVED");
}else{
System.out.println("UPDATED");
}
}
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
runOnUiThread(() -> {
populatelistview();
});
}
}
Code for saving to sqlite:
public boolean addBets(String betid, String betnum, String betAmt, String betTime, String betDate, String gameType, String betType) {
SQLiteDatabase db = getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("betid", betid);
contentValues.put("betNum", betnum);
contentValues.put("betAmt", betAmt);
contentValues.put("betTime", betTime);
contentValues.put("betDate", betDate);
contentValues.put("gameType", gameType);
contentValues.put("betType", betType);
String sql = "SELECT * FROM betsx WHERE betNum ='" + betnum + "' AND betTime ='" + betTime + "' AND betDate = '" + betDate + "' AND gameType ='" + gameType + "' AND betType ='" + betType + "'";
Cursor cursor = db.rawQuery(sql, null);
db.insert("betsx", null, contentValues);
System.out.println(betnum + "//" + betAmt);
return true;
}

How to check if data exists in a record before performing an action in SQLite?

I made an app to scan qr code. I want the data scanned from the qr code(which will be a number like 2300, 2301, 2302) to be compared to a column called ID in the sqlite database. Some of the values in the sqlite database for column ID are 2301, 2302, 2303. I want that the data scanned will be compared to the values in ID and if they match an action will be performed. If not an error message will be shown. If the qr code has value 2301, then the action will be perform. If it is 8900(a number not in the database) it displays a message:Student not found. I would also like to clarify that the scannedData is not being entered into the sqlite database but sent to a google script link. The sqlite database contains a list of students. I want that if the scanned data is not similar to nay ID in the sqlite database then the sannedData will not be sent to google app script destination.
This my database code for activity DatabaseHelper
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "Student.db";
public static final String TABLE_NAME = "student_table";
public static final String COL_1 = "ID";
public static final String COL_2 = "NAME";
public static final String COL_3 = "SURNAME";
public static final String COL_4 = "MARKS";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, 1);
}
#Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table " + TABLE_NAME +" (ID INT PRIMARY KEY UNIQUE,NAME TEXT,SURNAME TEXT,MARKS TEXT)");
}
Below is the code i want to modify to check if it is in the database. This is another activity called MainActivity.
public class ArrivalTime extends AppCompatActivity {
String scannedData;
Button scanBtn;
//-----------------------------------------------------------
//DatabaseHelper myDb;
//------------------------------------------------------------
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_arrival_time);
final Activity activity = this;
scanBtn = (Button) findViewById(R.id.scan_btn);
//-------------------------------------------------------
// myDb = new DatabaseHelper(this);
//---------------------------------------------------------
scanBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
IntentIntegrator integrator = new IntentIntegrator(activity);
integrator.setDesiredBarcodeFormats(IntentIntegrator.ALL_CODE_TYPES);
integrator.setPrompt("Place barcode in window to Scan it");
integrator.setBeepEnabled(true);
integrator.setCameraId(0);
integrator.setBarcodeImageEnabled(false);
integrator.initiateScan();
}
});
}
//-----------------------------------------------------------------------------------------
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
IntentResult result= IntentIntegrator.parseActivityResult(requestCode,resultCode,data);
if(result!=null){
scannedData = result.getContents();
if(scannedData != null){
// here we need to handle scanned data
// Cursor c = myDb.getId(String);
// if(c.getCount() == 0) {
// show message
// Toast.makeText(ArrivalTime.this,"Student doesn't exist in database",Toast.LENGTH_LONG).show();
// return;
//}
new SendRequest().execute();
}
else{
}
}
super.onActivityResult(requestCode, resultCode, data);
}
//-----------------------------------------------------------------------------------------
public class SendRequest extends AsyncTask<String, Void, String>{
protected void onPreExecute(){}
protected String doInBackground(String... arg0){
try{
URL url = new URL("https://script.google.com/macros/s/ttttttttttttttttttttttttttttttttttttttttttttt/exec");
JSONObject postDataParams = new JSONObject();
postDataParams.put("sdata",scannedData);
Log.e("params", postDataParams.toString());
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(15000 /* milliseconds */);
conn.setConnectTimeout(15000 /* milliseconds */);
conn.setRequestMethod("GET");
conn.setDoInput(true);
conn.setDoOutput(true);
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(os, "UTF-8"));
writer.write(getPostDataString(postDataParams));
writer.flush();
writer.close();
os.close();
int responseCode=conn.getResponseCode();
if (responseCode == HttpsURLConnection.HTTP_OK) {
BufferedReader in=new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuffer sb = new StringBuffer("");
String line="";
while((line = in.readLine()) != null) {
sb.append(line);
break;
}
in.close();
return sb.toString();
}
else {
return new String("false : "+responseCode);
}
}
catch(Exception e){
return new String("Exception: " + e.getMessage());
}
}
#Override
protected void onPostExecute(String result) {
Toast.makeText(getApplicationContext(), result,
Toast.LENGTH_LONG).show();
}
}
public String getPostDataString(JSONObject params) throws Exception {
StringBuilder result = new StringBuilder();
boolean first = true;
Iterator<String> itr = params.keys();
while(itr.hasNext()){
String key= itr.next();
Object value = params.get(key);
if (first)
first = false;
else
result.append("&");
result.append(URLEncoder.encode(key, "UTF-8"));
result.append("=");
result.append(URLEncoder.encode(value.toString(), "UTF-8"));
}
return result.toString();
}
//-----------------------------------------------------------------------------------------
I want the function to check if the scanned data in not null and that it exists in the database. I tried just doing if(scannedData != null && scanned==id) but i'm not sure how to call database data from another activity and perform a comparison
I've been given an example below but it assumes that i'm checking if there is a similar value as whatever's been scanned so that it can be entered into the sqlite database which is not what i want.
Any suggestions.

You can check bellow like..
public Boolean getId(String id) {
boolean rValue = false;
String selectQuery = "SELECT * FROM " + TABLE_NAME + " where "+ COL_1 +" = ? " ;
SQLiteDatabase db = this.getReadableDatabase();
Cursor c = db.rawQuery(selectQuery, new String[]{id});
if (c.moveToFirst()) {
do {
// Data Is Exist;
rValue = true;
} while (c.moveToNext());
}
db.close();
c.close();
return rValue;
}

the answer is very simple,you have to make a select query using a given value for the ID column and check the Cursor.getCount() method like this.
Cursor.getCount(); // returns number of rows from this query.
if it returns 0 so there are some rows in there that means the ID do exist
public boolean Contains(String ID) {
Cursor cursor = null;
cursor = db.rowQuery("SELECT * FROM student_table WHERE ID === ? ", new String[]{ID});
if (cursor.getCount() == 0) {
return false;
}
return true;
}

ListView not showing anything

My ListView is not showing anything.
I'm downloading the top stories API from Hacker-News and putting them in my app. I want to put the titles of those stories in my list view (they are over 100).
I download them and store them in a database for permanent storage and then add them to my list view, but NOTHING is showing up in my app. Can anyone explain to me why?
UPDATE: I get a CursorIndexOutOfBoundException problem. ( index 350 out of 350)
public class MainActivity extends AppCompatActivity {
ListView listView;
private SQLiteDatabase myDatabase;
private Cursor cursor;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listView);
DownloadIDs ids = new DownloadIDs();
String URL = "https://hacker-news.firebaseio.com/v0/topstories.json?print=pretty";
ids.execute(URL);
try {
ArrayList<String> titles = new ArrayList<String>();
ArrayAdapter arrayAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, titles);
listView.setAdapter(arrayAdapter);
myDatabase = this.openOrCreateDatabase("HackerNews", MODE_PRIVATE, null);
Cursor cursor1 = myDatabase.rawQuery("SELECT * FROM ids", null);
int index = cursor1.getColumnIndex("urlID");
cursor1.moveToFirst();
while (cursor1 != null) {
String newUrl = "https://hacker-news.firebaseio.com/v0/item/" + cursor1.getString(index) + ".json?print=pretty";
new DownloadContent().execute(newUrl);
cursor1.moveToNext();
}
Cursor cursor2 = myDatabase.rawQuery("SELECT * FROM content", null);
int titleIndex = cursor2.getColumnIndex("title");
cursor2.moveToFirst();
titles.add("Hello");
while(cursor2 != null){
titles.add(cursor2.getString(titleIndex));
arrayAdapter.notifyDataSetChanged();
cursor2.moveToNext();
}
}catch (Exception e){
e.printStackTrace();
}
}
public class DownloadIDs extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... params) {
String result = "";
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL(params[0]);
urlConnection = (HttpURLConnection) url.openConnection();
InputStream inputStream = urlConnection.getInputStream();
InputStreamReader reader = new InputStreamReader(inputStream);
int data = reader.read();
while (data >= 0) {
char current = (char) data;
result += current;
data = reader.read();
}
return result;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
try {
myDatabase.execSQL("CREATE TABLE IF NOT EXISTS ids (id INTEGER PRIMARY KEY, urlID VARCHAR)");
cursor = myDatabase.rawQuery("SELECT COUNT(*) FROM ids", null);
cursor.moveToFirst();
int count = cursor.getInt(0);
if (!(count > 0)) {
JSONArray ids = new JSONArray(s);
for (int i = 0; i < ids.length(); i++) {
myDatabase.execSQL("INSERT INTO ids (urlID) VALUES ('" + ids.getString(i) + "')");
}
}
}catch (Exception e){
e.printStackTrace();
}
}
}
public class DownloadContent extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... params) {
String result = "";
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL(params[0]);
urlConnection = (HttpURLConnection) url.openConnection();
InputStream inputStream = urlConnection.getInputStream();
InputStreamReader reader = new InputStreamReader(inputStream);
int data = reader.read();
while (data >= 0) {
char current = (char) data;
result += current;
data = reader.read();
}
return result;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
try {
myDatabase.execSQL("CREATE TABLE IF NOT EXISTS content(id INTEGER PRIMARY KEY, title VARCHAR, url VARCHAR)");
cursor = myDatabase.rawQuery("SELECT COUNT(*) FROM content", null);
cursor.moveToFirst();
int count = cursor.getInt(0);
if (!(count > 0)) {
JSONObject jsonObject = new JSONObject(s);
String title = jsonObject.getString("title");
Log.i("title", title);
String url = jsonObject.getString("url");
Log.i("url", url);
myDatabase.execSQL("INSERT INTO content (title, url) VALUES('" + title + "','" + url + "')");
}
}catch(Exception e){
e.printStackTrace();
}
}
}
}

Got it! I fixed it. I just had to reduce the amount of news (I decided to choose the top 20 ones), and I decided to run only one ASyncTask on my app.
Here is the edited code:
PD: Thanks to #cafebabe1991 as he gave me tips on how to fix it. Thanks!
public class MainActivity extends AppCompatActivity {
ListView listView;
private SQLiteDatabase myDatabase;
ArrayList<String> titles;
ArrayList<String> urls;
ArrayAdapter arrayAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listView);
titles = new ArrayList<>();
urls = new ArrayList<>();
arrayAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, titles);
listView.setAdapter(arrayAdapter);
try {
myDatabase = this.openOrCreateDatabase("HackerNews", MODE_PRIVATE, null);
DownloadTask downloadTask = new DownloadTask();
String URL = "https://hacker-news.firebaseio.com/v0/topstories.json?print=pretty";
downloadTask.execute(URL);
Cursor cursor = myDatabase.rawQuery("SELECT * FROM content", null);
int titleIndex = cursor.getColumnIndex("title");
int urlIndex = cursor.getColumnIndex("url");
cursor.moveToFirst();
while(cursor!=null){
titles.add(cursor.getString(titleIndex));
urls.add(cursor.getString(urlIndex));
cursor.moveToNext();
}
arrayAdapter.notifyDataSetChanged();
} catch (Exception e) {
e.printStackTrace();
}
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(getApplicationContext(), MainActivity2.class);
MainActivity2.url = urls.get(position);
startActivity(intent);
}
});
}
public class DownloadTask extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... params) {
String articleInfo = "";
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL(params[0]);
urlConnection = (HttpURLConnection) url.openConnection();
InputStream inputStream = urlConnection.getInputStream();
InputStreamReader reader = new InputStreamReader(inputStream);
int data = reader.read();
while (data >= 0) {
char current = (char) data;
articleInfo += current;
data = reader.read();
}
//myDatabase.execSQL("CREATE TABLE IF NOT EXISTS ids (id INTEGER PRIMARY KEY, urlID VARCHAR)");
myDatabase.execSQL("CREATE TABLE IF NOT EXISTS content (id INTEGER PRIMARY KEY, title VARCHAR, url VARCHAR)");
myDatabase.delete("content", null, null);
JSONArray ids = new JSONArray(articleInfo);
for (int i = 0; i < 20; i++) {
//myDatabase.execSQL("INSERT INTO ids (urlID) VALUES ('" + ids.getString(i) + "')");
String articleInfo2 = "";
URL url2 = new URL("https://hacker-news.firebaseio.com/v0/item/" + ids.getString(i) + ".json?print=pretty");
HttpURLConnection urlConnection2 = (HttpURLConnection) url2.openConnection();
InputStream inputStream2 = urlConnection2.getInputStream();
InputStreamReader reader2 = new InputStreamReader(inputStream2);
int data2 = reader2.read();
while (data2 >= 0) {
char current2 = (char) data2;
articleInfo2 += current2;
data2 = reader2.read();
}
JSONObject jsonObject = new JSONObject(articleInfo2);
String title = "'" + jsonObject.getString("title").replaceAll("'", "") + "'";
String articleURL = "'" + jsonObject.getString("url") + "'";
myDatabase.execSQL("INSERT INTO content (title, url) VALUES (" + title + "," + articleURL + ")");
}
return null;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
}
}
}

The problem lies in this code
1.)
Cursor cursor1 = myDatabase.rawQuery("SELECT * FROM ids", null);
int index = cursor1.getColumnIndex("urlID");
cursor1.moveToFirst();
while (cursor1 != null) {
String newUrl = "https://hacker-news.firebaseio.com/v0/item/" + cursor1.getString(index) + ".json?print=pretty";
new DownloadContent().execute(newUrl);
cursor1.moveToNext();
}
How ?
You say to to cursor to get you the column index and from that you fetch the item id, but when database is empty the value will be null. Hence the api will not return a response. Additionally you do the same mistake with the cursor as mentioned in the point below.
2.)
int titleIndex = cursor2.getColumnIndex("title");
cursor2.moveToFirst();
titles.add("Hello");
while(cursor2 != null){
titles.add(cursor2.getString(titleIndex));
arrayAdapter.notifyDataSetChanged();
cursor2.moveToNext();
}
How ?
You said to the cursor to move to the first record (moveToFirst()) , what if the currently no record exist. This method returns false if the cursor is empty. So make sure that this method returns true and then proceed.
OR
Do this(Better approach)...
while(cursor.moveToNext()) {
//If inside , that means you are on the next record.Fetch the column values here
}
References :
Cursor methods
Discussion about best ways to iterate a cursor
For loading data into the listview from the database

How to Send All SQLite Data to online Server

I am storing data into SQLiteDatabase which is stored into SD Card, now i have to send all SQLite data to server.
Note: I have created same fields to server database as well (simillar to SQLite DB) for an eg: PersonName
Below code i used to check, am i able to store data to server (for testing purpose - i accepted data by user into edittext) and then sent to server, and i was successful in that.
String url = "http://localhost/ChurchData.php";
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("sPersonName", editPersonName.getText().toString()));
String resultServer = getHttpPost(url,params);
Log.d("Entire string::", " " + resultServer);
/*** Default Value ***/
strStatusID = "0";
strError = "";
JSONObject c;
try {
c = new JSONObject(resultServer);
strStatusID = c.getString("StatusID");
strError = c.getString("Message");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// prepare save data
if(strStatusID.equals("0"))
{
Toast.makeText(getApplicationContext(), "Already Exist !", Toast.LENGTH_LONG).show();
}
else
{
Toast.makeText(getApplicationContext(), "Data Uploaded Successfully!", Toast.LENGTH_SHORT).show();
}
return true;
}
private String getHttpPost(String url,
List<NameValuePair> params) {
StringBuilder str = new StringBuilder();
HttpClient client = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
try {
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse response = client.execute(httpPost);
StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
if (statusCode == 200) { // Status OK
HttpEntity entity = response.getEntity();
InputStream content = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(content));
String line;
while ((line = reader.readLine()) != null) {
str.append(line);
}
} else {
Log.e("Log", "Failed to download result..");
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return str.toString();
}
So may i know, How can i send SQLite database records to server ? My database class looks like this:
public class myDBClasss extends SQLiteOpenHelper {
// Database Version
private static final int DATABASE_VERSION = 2;
// Database Name
private static final String DATABASE_NAME = "ChurchDB";
// Table Name
private static final String TABLE_MEMBER = "DataTable";
public myDBClasss(Context context) {
// to store data into SD Card
super(context, Environment.getExternalStorageDirectory()
+ File.separator + "ChurchData"
+ File.separator + DATABASE_NAME, null, DATABASE_VERSION);
}
#Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
// Create Table Name
db.execSQL("CREATE TABLE " + TABLE_MEMBER +
"(PersonName VARCHAR(100)," +
" PersonEmail VARCHAR(100)," +
" PersonTelephone VARCHAR(100)," +
" Newsletter VARCHAR(100));"); // checkbox
Log.d("CREATE TABLE","Create Table Successfully - classs");
}
// Insert Data
public long insertData(String strPersonName, String strPersonEmail, String strPersonTelephone, String strNewsletter) {
// TODO Auto-generated method stub
try {
SQLiteDatabase db;
db = this.getWritableDatabase(); // Write Data
ContentValues Val = new ContentValues();
Val.put("PersonName", strPersonName);
Val.put("PersonEmail", strPersonEmail);
Val.put("PersonTelephone", strPersonTelephone);
Val.put("Newsletter", strNewsletter); // checkbox
long rows = db.insert(TABLE_MEMBER, null, Val);
db.close();
return rows; // return rows inserted.
} catch (Exception e) {
return -1;
}
}
// Update Data
public long updateData(String strPersonName, String strPersonEmail, String strPersonTelephone, String strNewsletter){
// TODO Auto-generated method stub
try {
SQLiteDatabase db;
db = this.getWritableDatabase(); // Write Data
ContentValues Val = new ContentValues();
Val.put("PersonName", strPersonName);
Val.put("PersonEmail", strPersonEmail);
Val.put("PersonTelephone", strPersonTelephone);
Val.put("Newsletter", strNewsletter); // checkbox
long rows = db.update(TABLE_MEMBER, Val, "PersonName=?",
new String[] { String.valueOf(strPersonName) });
db.close();
return rows; // return rows updated.
} catch (Exception e) {
return -1;
}
}
// Fetch data
public String[] selectData(String strPersonName) {
// TODO Auto-generated method stub
try {
String arrData[] = null;
SQLiteDatabase db;
db = this.getReadableDatabase(); // Read Data
Cursor cursor = db.query(TABLE_MEMBER, new String[] { "*" },
"PersonName=?",
new String[] { String.valueOf(strPersonName) }, null, null, null, null);
if(cursor != null)
{
if (cursor.moveToFirst()) {
arrData = new String[cursor.getColumnCount()];
arrData[0] = cursor.getString(0);
arrData[1] = cursor.getString(1);
arrData[2] = cursor.getString(2);
arrData[3] = cursor.getString(3); // checkbox
}
}
cursor.close();
db.close();
return arrData;
} catch (Exception e) {
return null;
}
}
// Check for data(s) using PersonName field
public boolean exists(String strImageName) {
SQLiteDatabase db;
db = this.getReadableDatabase(); // Read Data
Cursor cursor = db.rawQuery("select 1 from DataTable where PersonName= ?",
new String[] { strImageName });
boolean exists = (cursor.getCount() > 0);
cursor.close();
return exists;
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + TABLE_MEMBER);
// Re Create on method onCreate
onCreate(db);
}
}

I think easy way is that you convert all your sqlite data into xml or json and then only one http request is required to send all your data to online server. At online server you can easily parse your data as you already know the structure of your xml or json whatever you used.
let say you have 2 fields in your database. ID , Name. you have 10 records. you convert all your records into json .
let say you query your database for all records and now cursor object will hold all your sqlite data.
add getAllData() method to retrieve all your database data.
public Cursor getAllData() {
String selectQuery = "Select * from "+TABLE_MEMBER;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
return cursor;
}
now do,
Cursor cursor = getAllData(); //cursor hold all your data
JSONObject jobj ;
JSONArray arr = new JSONArray();
cursor.moveToFIrst();
while(cursor.moveToNext()) {
jobj = new JSONObject();
jboj.put("Id", cursor.getInt("Id"));
jboj.put("Name", cursor.getString("Name"));
arr.put(jobj);
}
jobj = new JSONObject();
jobj.put("data", arr);
String st = jboj.toString();
now simply make an http call with string parameter and send to server.and parse at server by converting this string into jsonobject.
now according to your code, do
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("allData", st));
String resultServer = getHttpPost(url,params);

I have some snippet of code just for your idea.If it help you it my pleasure.
protected void startSync(Context aContext) {
try {
AccountManager am = AccountManager.get(getBaseContext());
Account[] ac = am.getAccountsByType(Constants.ACCOUNT_TYPE);
if (ac.length > 0) {
Toast.makeText(SuperHomeActivity.this,
"Synchronization Started", Toast.LENGTH_SHORT).show();
List<PeriodicSync> aList = ContentResolver.getPeriodicSyncs(
ac[0], Constants.AUTHORITY);
Bundle bundle = new Bundle();
bundle.putBoolean(ContentResolver.SYNC_EXTRAS_EXPEDITED, false);
if (aList != null && aList.size() > 0) {
while (aList != null && !aList.isEmpty()) {
ContentResolver.removePeriodicSync(ac[0],
Constants.AUTHORITY, aList.get(0).extras);
aList.remove(0);
}
}
// mention only in seconds -> 120 minutes 60 seconds
ContentResolver.addPeriodicSync(ac[0], Constants.AUTHORITY,
bundle, 5 * 60); //15
ContentResolver.requestSync(ac[0], Constants.AUTHORITY, bundle);
}
} catch (Exception ex) {
Log.e("SyncAccountTriggerError", ex.getMessage());
}
}
And you can call it by
startSync(getApplicationContext());
For any more clarification you can ping me.

you can use Http Post method or Get method or if you directly wants to update your server DB then use Put method. You can send data by http request with NameValue pair and just get that data from server and update your DB. That's it.

cannot compare arraylist values in android

i am creating an android application in which i want to access database from mysql for user name, phone no and email address. and i want to compare phone no from android phone contact list and the phone no getting from mysql database. for that purpose i use 2 arraylist 1st for phone contact and 2nd for mysql phone no.
my main problem is when i compare both the arraylist then i shows no result.
i attach here the code please someone help me to solve this problem.
public class PhoneNoActivity extends Activity{
JSONArray jArray,jArray1;
JSONObject jobj;
String result = null,phone=null;
InputStream is = null;
StringBuilder sb=null;
double lat=0;
double lon=0;
String user=null;
ArrayList<NameValuePair> nameValuePairs;
ListView lv;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
String phno=null;
ArrayList<String> cntPhone=new ArrayList<String>();
ContentResolver cr = getContentResolver();
Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
if (cur.getCount() > 0) {
while (cur.moveToNext()) {
String id = cur.getString(cur.getColumnIndex(ContactsContract.Contacts._ID));
String name = cur.getString(cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
if (Integer.parseInt(cur.getString(cur.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {
Cursor pCur = cr.query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = ?", new String[]{id}, null);
while (pCur.moveToNext()) {
String phoneNo = pCur.getString(pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
if(phoneNo.length()>10) {
phno=phoneNo.subSequence(phoneNo.length()-10, phoneNo.length()).toString();
// Log.e(name, phno);
}
cntPhone.add(phoneNo);
}
pCur.close();
}
}
}
ArrayList<String> cntOnline=new ArrayList<String>();
try {
nameValuePairs = new ArrayList<NameValuePair>();
/*String phone=null;
for(int k=0;k<=cntPhone.size();k++) {
Log.e("k",k+"");
phone=cntPhone.get(k);
nameValuePairs.add(new BasicNameValuePair("phone", phone));
*/
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://10.0.2.2/ah_login_api/select.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
sb = new StringBuilder();
sb.append(reader.readLine() + "\n");
String line="0";
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result=sb.toString();
Log.e("result=", result);
jArray = new JSONArray(result);
JSONObject json_data=null;
for(int i=0;i<jArray.length();i++){
json_data = jArray.getJSONObject(i);
user=json_data.getString("user");
phone=json_data.getString("phone");
lat=json_data.getDouble("email");
cntOnline.add(phone);
}
for(String s:cntOnline) {
for(String s1:cntPhone ) {
if(s.equals(s1)) {
Log.e("match found", phone);
}
}
}
/*
for(int l=0;l<cntOnline.size();l++) {
Log.e("loop start", ""+l);
for(int k=0;k<cntPhone.size();k++) {
if(cntPhone.get(k).trim().equals(cntOnline.get(l).trim())) {
Log.e("match found", phone);
}
}
}*/
//}
} catch(Exception ex) {
Log.e("Exception in ",ex.toString());
}
}
}
and this is my php code from which i access details
<?php
mysql_connect("localhost","root","");
mysql_select_db("MyContact");
$sql=mysql_query("select * from newuser");
while($row=mysql_fetch_assoc($sql))
$output[]=$row;
print(json_encode($output));
mysql_close();
?>

/* Retrieves phone numbers from Phone Contact List */
public ArrayList<String> getNumber() {
String phoneNumber;
ArrayList<String> contact_number = new ArrayList<String>();
ContentResolver cr = getApplicationContext().getContentResolver();
Cursor phones = cr.query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null,
null, null);
while (phones.moveToNext()) {
phoneNumber = phones
.getString(phones
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
System.out.println(".................." + phoneNumber);
contact_number.add(phoneNumber);
}
phones.close();
return contact_number;
}
/* Gets the Numbers from MySQL database using object "Contact" and Compares it with the method "getNumber()" which retrieves phone numbers from Phone Contact List */
#SuppressWarnings("unused")
private Contact convertContact(JSONObject obj) throws JSONException {
Contact contact = new Contact();
String name = obj.getString("user_name");
String mobile_no = obj.getString("mobile_no");
boolean isMatched = false;
contact_number = getNumber();
for (int i = 0; i < contact_number.size(); i++) {
if (mobile_no.equals(contact_number.get(i))) {
isMatched = true;
contact.setName(name);
contact.setMobileNo(mobile_no);
}
}
return isMatched ? contact : null;
}
/* If the number from database matches with the phone contact list add and generate in listview */
private class AsyncTasak extends
AsyncTask<String, Void, ArrayList<Contact>> {
#Override
protected void onPostExecute(ArrayList<Contact> result) {
super.onPostExecute(result);
arrayadapter.setItemList(result);
arrayadapter.notifyDataSetChanged();
}
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected ArrayList<Contact> doInBackground(String... params) {
ArrayList<Contact> result = new ArrayList<Contact>();
try {
URL u = new URL(params[0]);
HttpURLConnection conn = (HttpURLConnection) u.openConnection();
conn.setRequestMethod("GET");
conn.connect();
InputStream is = conn.getInputStream();
byte[] b = new byte[1024];
ByteArrayOutputStream baos = new ByteArrayOutputStream();
while (is.read(b) != -1)
baos.write(b);
String JSONResp = new String(baos.toByteArray());
JSONArray arr = new JSONArray(JSONResp);
for (int i = 0; i < arr.length(); i++) {
Contact temp = convertContact(arr.getJSONObject(i));
if (temp != null) {
result.add(temp);
}
}
return result;
} catch (Throwable t) {
t.printStackTrace();
}
return null;
}