Develop Reference

NumberFormatException invalid int

this is my saveddata.java page who can I solve
when I want to update data its say number expectation
and data insert but not update
I am trying to take the input values from EditText and I want to save it to SQLite Database. I don't know how to use the logcat [also please explain how can I read the errors from the LogCat].
package com.turningpoint.currencycounter;
import java.util.List;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class saveddata extends Activity{
DBHelper mydb;
private ListView obj;
ListViewAdapter lviewAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.saveditem);
ListViewAdapter arrayAdapter;
mydb = new DBHelper(this);
List<String> friendsnames= mydb.getAllCotacts();
List<String> friendsnames2= mydb.getAllCotacts2();
String frnames[]=friendsnames.toArray(new String[friendsnames.size()]);
String frnames2[]=friendsnames2.toArray(new String[friendsnames2.size()]);
arrayAdapter = new ListViewAdapter(this, frnames, frnames2);
obj = (ListView)findViewById(R.id.listView1);
obj.setAdapter(arrayAdapter);
obj.setOnItemClickListener(new OnItemClickListener(){
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {
// TODO Auto-generated method stub
int id_To_Search = arg2;
List array_list = mydb.getAllCotacts();
String s = array_list.get(id_To_Search).toString();
Cursor c2 = mydb.getData4(s);
while (c2.moveToNext()) {
String id = c2.getString(0);
String code = c2.getString(1);
// String code ..give me Number inut Expetation
int id2 = Integer.parseInt(id);
int code2 = Integer.parseInt(code);
Bundle dataBundle = new Bundle();
dataBundle.putInt("id", id2);
int update=1;
dataBundle.putInt("update", update);
dataBundle.putInt("code", code2);
Intent intent = new Intent(getApplicationContext(),MainActivity.class);
intent.putExtras(dataBundle);
Toast.makeText(getApplicationContext(), code, Toast.LENGTH_SHORT).show();
startActivity(intent);
}
Toast.makeText(getApplicationContext(), s,Toast.LENGTH_SHORT).show();
}
});
}
}

Use android:inputType="number" in EditText to make sure that the input is a number not a string or a charater like this
<EditText
.
.
.
android:inputType="number"
/>
Another solution:
Check if it is a number programmatically
boolean digitsOnly = TextUtils.isDigitsOnly(editText.getText());
Read this article. You will know how to use the logcat
https://guides.codepath.com/android/Debugging-Exceptions-within-your-App

I solve this problem
int code2 = Integer.parseInt(code);
this c2.getString(1) could not Int its give me String

setting values from an json array to spinner on application level

I want to set Json values into a spinner list. The data I have:
JSONArray lang = jsonObject.getJSONArray("languages");
for (int i = 0; i < lang.length(); i++) {
String language = lang.getString(i);
}
How can i load String values into a spinner list?

ArrayAdapter<String> arrayAdapter = new ArrayAdapter(yourContext, android.R.layout.activity_list_item)
arrayAdapter.addAll(langList); // you need to add your lang.getString(i) to an array
yourSpinner.setAdapter(arrayAdapter);
and voila!

As i understand your problem, you have list of records and you want to show them in spinner in multiple activity.
For this you can create an Class that extends Application Class and create a list in that class.
once You receive response from you web api set data in list of application class.
Now where ever you want to display data in Spinner get it from Application class and render your spinner
See below Example -
public class MyApp extends Application{
private static ArrayList<String> mDataArrayList;
public static ArrayList<String> getmDataArrayList() {
return mDataArrayList;
}
public static void setmDataArrayList(ArrayList<String> mDataArrayList) {
MyApp.mDataArrayList = mDataArrayList;
}
#Override
public void onCreate() {
super.onCreate();
}
}
Call your web api and parse data as you code in your question -
ArrayList<String> mArrayList = new ArrayList<String>();
for (int i = 0; i < lang.length(); i++) {
String language = lang.getString(i);
mArrayList.add(language);
}
//Set Application class list
MyApp.setmDataArrayList(mArrayList);
Now when you want to display data in any class then get list by calling -
ArrayList<String> mArrayList = MyApp.getmDataArrayList();
//Code to display data in Spinner
Hope it will help you.
And dont forgot to add it to manifest of your application -
<application
android:allowBackup="true"
android:name=".MyApp"
....>
....
</application>

I'd suggest you to use Spinner class activity for future usages. Here is the example of spinner activity class (data receiver and displayer):
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.Toast;
public class mySpinnerClass extends Activity implements
OnItemSelectedListener {
Spinner spinner;
int selectedValue;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.spinner);
selectedValue = -1;
Intent i = getIntent();
dataSelector = i.getStringExtra("MessageText");
// Spinner element
spinner = (Spinner) findViewById(R.id.mySpinner);
// Spinner click listener
spinner.setOnItemSelectedListener(this);
// Loading spinner data
loadSpinnerData();
}
private void loadSpinnerData() {
// Spinner Drop down elements
List<String> lables = yourData.get(dataSelector);
// Creating adapter for spinner
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, lables);
// Drop down layout style - list view with radio button
dataAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
spinner.setAdapter(dataAdapter);
}
public void onItemSelected(AdapterView<?> parent, View arg1, int position, long arg3) {
// TODO Auto-generated method stub
String label = parent.getItemAtPosition(position).toString();
//get the label and do anything you want with it
}
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
In caller activity:
Intent i = new Intent(getApplicationContext(), mySpinnerClass.class);
i.putExtra("MessageText",yourData);
startActivity(i);
If you want to send non-primitive data (in your example, this is a list) you need to use Serializable type while sending and receiving it. The following link illustrates this technique well:
http://javatechig.com/android/pass-a-data-from-one-activity-to-another-in-android

iterating a global list from any activity

i have a list of object in an activity in which a button in the same activity adds an object to it on every click
i want to be capable to access that list and iterate it from any other activity
i made it public but it gave me an error !
package com.fawzyx.movie_rental_store;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MovieReg_activity extends Activity {
public List<movie> movies = new ArrayList<movie>();
String movName ;
int dvdNo ;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.mov_reg_layout);
EditText etmovie_name = (EditText)findViewById(R.id.etmovname);
EditText etdvd_no = (EditText)findViewById(R.id.etdvds);
Button btMovie_submit = (Button)findViewById(R.id.btmovsubmit);
movName= etmovie_name.getText().toString();
dvdNo = Integer.parseInt(etdvd_no.getText().toString()); // to string then to int :)
btMovie_submit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
movies.add(new movie(movName , dvdNo) );
Toast.makeText(MovieReg_activity.this, "Movie Added", Toast.LENGTH_LONG).show();
}
});
}
}
is there a way to access and iterate the list movies from any other activity ?

You can use a static way to access to this list :
public static List<movie> movies = new ArrayList<movie>();
Then from the other activity :
int size = MovieReg_activity.movies.size(); // exp: check the size
for(movie m : MovieReg_activity.movies){
// do something with m
}

if you want to make a global list, create a static variable or put it in your application class and access it via context.
Search about creating a custom application class.

Maybe use a singleton class that holds your movie list.
Then you'll be able to access it everywhere.
http://androidresearch.wordpress.com/2012/03/22/defining-global-variables-in-android/

how to pass array value to next activity

i want to pass all the array values to next activity .but i dont know how to do that
how to use arrayList to implement this .
i have done this coding but it give me an error when i click on the button
i closed applicaton forcefully
package com.example.snooder;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.RelativeLayout.LayoutParams;
public class players extends Activity {
LinearLayout player_layout;
Bundle b;
List<EditText> allEds = new ArrayList<EditText>();
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.players);
b = getIntent().getExtras();
String resStr = b.getString("name");
player_layout = (LinearLayout) findViewById(R.id.player_layout);
EditText[] ed1 = new EditText[Integer.parseInt(resStr)+1];
Button add_player = new Button(players.this);
add_player.setText("Add Players");
for(int i=1;i<=Integer.parseInt(resStr);i++)
{
ed1[i] = new EditText(players.this);
allEds.add(ed1[i]);
player_layout.addView(ed1[i]);
ed1[i].setId(i);
ed1[i].setHint("enter player" +i+ "name");
ed1[i].setHeight(50);
ed1[i].setWidth(300);
add_player.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(players.this,player_name.class);
String[] strings = new String[allEds.size()];
for(int i=0; i < allEds.size(); i++){
strings[i] = allEds.get(i).getText().toString();
}
for(int i=0;i<allEds.size();i++)
{
intent.putExtra("playerName",strings[i].toString());
}
startActivity(intent);
}
});
}
LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
player_layout.addView(add_player, lp);
}
}

The error happens here:
intent.putExtra("playerName",strings[i].toString());
At this point, the array strings is still empty; you are trying to reference null values.
With regards to your question, however, you got the proper method: put the values in the intent that will be sent to the next activity. You can use putExtra that takes a String array as shown on this SO question.

You are adding all extras with same name in the end it is going to be just one.
There is overloaded version of putExtra for array of strings

Android ListView problems

I can't get my ListView work. When i run emulator it doesn't display ListView with data from databse wihich I created.
I would like to insert data to database through EditText and then display data
Main Program
package test.test;
import java.util.ArrayList;
import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.text.Editable;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
public class TestActivity extends Activity {
/** Called when the activity is first created. */
private ListView listview;
private TextView textview;
private Button button;
private EditText edittext;
SQLiteDatabase databas;
//private String[] test = {"abc","abc","abc", "abc", "abc", "abc"};
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ArrayList<String> test2 = new ArrayList<String>();
listview = (ListView)findViewById(R.id.test);
textview = (TextView)findViewById(R.id.mm);
button = (Button)findViewById(R.id.kanp);
edittext = (EditText)findViewById(R.id.textetid);
databas = (new dbHelper(this)).getWritableDatabase();
final ContentValues values = new ContentValues();
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Editable ord = edittext.getText();
String ordDb = ord.toString();
//String sql = "INSERT INTO ordlista (ord) " +
//"VALUES (" + ordDb + ")";
//databas.rawQuery(sql, null);
values.put("ord", ordDb);
long varde = databas.insert("ordlista", null, values);
String varde2 = Long.toString(varde);
textview.setText(varde2);
}
});
//#############################TORSDAG###############################
Cursor c = databas.rawQuery( "select ord from ordlista", null);
startManagingCursor(c);
int n = 1;
while(c.isBeforeFirst() == false){
String dbVarde = c.getString(n);
test2.add(dbVarde);
c.moveToNext();
n++;
}
ArrayAdapter<String> aa;
aa = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, test2);
listview.setAdapter(aa);
//listview.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, test));
}
}

You could try using a SimpleCursorAdapter and save the overhead of maintaining an ArrayAdapter. Rather than having to populate an ArrayList all the time, you can just create a Cursor against the query when you need it updated and set the ListView's adapter. A SimpleCursorAdapter also has the added benefit of handling the list item's population for you based on the columns you provide.
For example:
String[] fieldsFromDB = new String[] {"ord"};
int[] fieldsOnListItem = new int[] {android.R.id.text1};
Cursor c = databas.rawQuery("select ord from ordlista", null);
listview.setAdapter(new SimpleCursorAdapter(this,android.R.layout.simple_list_item_1,c,fieldsFromDB,fieldsOnListItem));