Develop Reference

Is it possible to get data from my listview onclick

Hi I have been working through several different tutorials on getting data from a sql database into a listview. I can add data, get data from database and populate the list view, and have a working onclick listener (will fire off a Toast message). However I can not get any data from the listview when clicked. I have tried different combinations of getitem and getItemAtPosition but they all return a empty string(blank toast). Would someone be kind enough to look at my code and tell me if what I am trying to do is possible. In my listview i have four items in each entry, I would like to either get the fourth item directly or get all the items (as string?) then I can pull out the data I need.
Thanks in advance for your time.
public class ListViewActivity extends Activity {
SQLiteHelper SQLITEHELPER;
SQLiteDatabase SQLITEDATABASE;
Cursor cursor;
SQLiteListAdapter ListAdapter ;
ArrayList<String> ID_ArrayList = new ArrayList<String>();
ArrayList<String> GENRE_ArrayList = new ArrayList<String>();
ArrayList<String> NAME_ArrayList = new ArrayList<String>();
ArrayList<String> URL_ArrayList = new ArrayList<String>();
ListView LISTVIEW;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_view);
LISTVIEW = (ListView) findViewById(R.id.listView1);
SQLITEHELPER = new SQLiteHelper(this);
}
#Override
protected void onResume() {
ShowSQLiteDBdata() ;
super.onResume();
}
private void ShowSQLiteDBdata() {
SQLITEDATABASE = SQLITEHELPER.getWritableDatabase();
cursor = SQLITEDATABASE.rawQuery("SELECT * FROM demoTable1", null);
ID_ArrayList.clear();
GENRE_ArrayList.clear();
NAME_ArrayList.clear();
URL_ArrayList.clear();
if (cursor.moveToFirst()) {
do {
ID_ArrayList.add(cursor.getString(cursor.getColumnIndex(SQLiteHelper.KEY_ID)));
GENRE_ArrayList.add(cursor.getString(cursor.getColumnIndex(SQLiteHelper.KEY_Genre)));
NAME_ArrayList.add(cursor.getString(cursor.getColumnIndex(SQLiteHelper.KEY_Name)));
URL_ArrayList.add(cursor.getString(cursor.getColumnIndex(SQLiteHelper.KEY_Url)));
} while (cursor.moveToNext());
}
ListAdapter = new SQLiteListAdapter(ListViewActivity.this,
ID_ArrayList,
GENRE_ArrayList,
NAME_ArrayList,
URL_ArrayList
);
LISTVIEW.setAdapter(ListAdapter);
LISTVIEW.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// String text = (String) LISTVIEW.getAdapter().getItem(position);
String text = (String) LISTVIEW.getItemAtPosition(position);
//String text = (String) lv.getItemAtPosition(0);
// Object item = (Object) LISTVIEW.getItemAtPosition(position);
Toast.makeText(getApplicationContext(), text, Toast.LENGTH_SHORT).show();
}
});
cursor.close();
}
}

LISTVIEW.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
String value1 = ID_ArrayList.get(position);
String value2 = GENRE_ArrayList.get(position);
String value3 = NAME_ArrayList.get(position);
String value4 = URL_ArrayList.get(position);
Toast.makeText(getApplicationContext(),value1+" "+value2+" "+value3+" "+value4, Toast.LENGTH_SHORT).show();
}
});

try to change the line
String text = (String) LISTVIEW.getItemAtPosition(position);
with
String text = (String) parent.getItemAtPosition(position);
this should be the way ListView works.
Also i suggest you to not use Capital Cases with variables, usually in Java is used a CamelCase convention. And also have a look at RecyclerView, that usually is implemented today much more than ListView, because allow a great level of customization

Pls use below code within listview setOnItemClickListener :-
String genreID = ID_ArrayList.get(position);
String genre = GENRE_ArrayList.get(position);
String genreName = NAME_ArrayList.get(position);
String genreUrl = URL_ArrayList.get(position);
Toast.makeText(getApplicationContext(), genreID+", "+genre+","+genreName+", "+genreUrl+", "+, Toast.LENGTH_SHORT).show();
its return render data of listview.

try this,
ShowSQLiteDBdata() in onCreate() instead of onResume() method

BaseAdapter On Scroll Refresh Data in ListView

I'm Very new to Java and android... I'm Try to create an ListView using BaseAdapter List being created successfully i have a EditText along with button for each list item but the real problem is when i put some data into editText Field and scroll down to change value of last list item then i go back to the top it refreshes the data to default value it doesn't contain the value which was entered by user before scrolling down
My BaseAdaper Code
class CoustomAdptr extends BaseAdapter{
String[] dates;
Integer[] inventory;
Integer totalrooms;
public CoustomAdptr(RoomFragment roomFragment, String[] dates, Integer[] inventory, Integer totalrooms) {
this.dates = dates;
this.inventory = inventory;
this.totalrooms = totalrooms;
}
#Override
public int getCount() {
return dates.length;
}
#Override
public Object getItem(int i) {
return null;
}
#Override
public long getItemId(int i) {
return 0;
}
#Override
public View getView(final int i, View view, ViewGroup viewGroup) {
view = getLayoutInflater().inflate(R.layout.inventory_listview,null);
TextView textView = (TextView) view.findViewById(R.id.roomListViewText);
final EditText editText = (EditText) view.findViewById(R.id.roomListInventory);
final Button updateButton = (Button) view.findViewById(R.id.roomListViewInventoryUpdateButton);
if(inventory[i] == 0){
editText.setBackgroundColor(getResources().getColor(R.color.SoldOut));
editText.setTextColor(getResources().getColor(R.color.SoldOutTextColor));
} else if(inventory[i] < totalrooms){
editText.setBackgroundColor(getResources().getColor(R.color.invetory));
editText.setTextColor(getResources().getColor(R.color.invetoryTextColor));
} else if(inventory[i] == totalrooms){
editText.setBackgroundColor(getResources().getColor(R.color.fullInventory));
editText.setTextColor(getResources().getColor(R.color.fullInventoryTextColor));
}
editText.setText(String.valueOf(inventory[i]));
textView.setText(dates[i]);
updateButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//String name = editText.getText().toString();
//String name1 = dates[i];
//String name2 = getArguments().getString("room_id");
updateButton.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_done_black_24dp,0,0,0);
//updateButton.setBackgroundColor(getResources().getColor(R.color.SoldOut));
updateButton.setText("Updated");
updateButton.setEnabled(false);
Toast.makeText(getContext(), "Update Inventory Button Clicked", Toast.LENGTH_LONG).show();
}
});
return view;
}
}
This is How Im Passing Data to My Adapter
JSONObject jObj = parentObject.getJSONObject("success");
JSONObject jObj2 = jObj.getJSONObject("data");
JSONArray arrajson = jObj2.getJSONArray("inventories");
String arrayCount = Integer.toString(arrajson.length());
String[] dates = new String[arrajson.length()];
Integer[] inventory = new Integer[arrajson.length()];
Integer totalrooms = new Integer(jObj2.getInt("total_room"));
for (int i=0; i<arrajson.length();i++){
JSONObject jsonObject = arrajson.getJSONObject(i);
dates[i] = jsonObject.getString("date");
inventory[i] = jsonObject.getInt("inventory");
}
CoustomAdptr coustomAdptr = new CoustomAdptr(RoomFragment.this,dates,inventory,totalrooms);
listView.setAdapter(coustomAdptr);
Help Needed :- I Want to retain same visible and Value of edittext as users enters on scroll up or down... i hope i was able to explain my problem clearly

After clicking a button, save it's state in a boolean array or somewhere else. And inside getView method, check if this button was previously clicked or not then setup your view accordingly.
It would be better if you create a model class for rows.

how to get Associated Json value based on selected spinner item

I have two urls, one for getting the regionname and second for login. the first url gives the response as
[{"CmpnyName":"Indore","CmpnyCode":"111"},{"CmpnyName":" Nagpur","CmpnyCode":"222"},{"CmpnyName":" Jabalpur","CmpnyCode":"333"},{"CmpnyName":"Amravati","CmpnyCode":"444"}]
now I have to display the CmpnyName in the spinner. So I did as,
typeofcompany.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
ba = typeofcompany.getSelectedItem().toString();
SelectType(ba);
}
#Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
My problem is when I select the CmpnyName, it should call its associated CmpnyCode for example indore should call 111 and so on....which is to be used in the second url...i am not getting how to do it..any help please....thank u

You can have a bean class for your model.
class MyBean implements java.io.Serializable{
String companyName;
String companyCode;
//getter-setter
}
Then set a custom adapter for your Spinner by passing array list of bean classes i.e. ArrayList<MyBean>
Then in spinner's onItemSelectedListener do something like,
typeofcompany.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
MyBean clickedCompany = myBeanList.get(i);
// then you can get clickedCompany.getCompanyName();
// clickedCompany.getCompanyCode();
}
#Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});

First, Parse your Gson string in this way:
ArrayList<HashMap<String,String>> companyNameList = new ArrayList<>()
ArrayList<HashMap<String,String>> companyIdList= new ArrayList<>();
try
{
JSONArray array = new JSONArray(preferenceManager.getSalaryJobFilter());
for(int arr = 0; arr<array.length(); arr++){
HashMap<String,String> hashMap = new HashMap<>();
HashMap<String,String> hashMap1 = new HashMap<>();
JSONObject object = array.getJSONObject(arr);
hashMap.put("companyName",object.getString("companyName"));
hashMap1.put("companyCode",object.getString("companyCode"));
companyNameList .add(hashMap);
companyIdList.add(hashMap1);
}
}
catch (JSONException e) {
e.printStackTrace();
}
Now fill your list from "companyNameList":
for (int i = 0; i < companyNameList.size(); i++) {
companyNameSpinnerList.add(companyNameList.get(i).get("companyName"));
}
companyNameAdapter.notifyDataSetChanged();
Then use
String company_name_id= companyIdList.get(i).get("companyCode");
Inside Ur "onItemSelected" method.
"company_name_id" will be the ID for the selected Company name you needed.
Method 1- Use "companyNameList" array to fill you adapter. Once you click on any item get its position and use "companyIdList" for getting id of it.
Method: 2- You can also use POJO class for it...First get the selected item position, (In ur case its "i") and use it for getting companyid from your POJO

How to map json array elements to option selected in Spinner?

I have a json array like below and want to select corresponding id when an option is selected from spinner which is also dynamic i.e. also a json array which is displayed in Spinner
{
"DoctorName": ["0001 DR. Sameer", "0001 DR.Krishna murti", "110 Mr. Ram", "4 Mr. Yash Pathak.", "99 Dr. Varma"],
"DoctorId": [3,2,110,4,99]
};
and I have to do it into Android. Any help will be appreciated.

1.First Create a class
public class DoctorName
{
public String id = "";
public String name = "";
public void setId(String id)
{
this.id = id;
}
public void setName(String name)
{
this.name = name;
}
public String getName()
{
return name;
}
public String getId()
{
return id;
}
// A simple constructor for populating our member variables for this tutorial.
public DoctorName( String _id, String _name)
{
id = _id;
name = _name;
}
// The toString method is extremely important to making this class work with a Spinner
// (or ListView) object because this is the method called when it is trying to represent
// this object within the control. If you do not have a toString() method, you WILL
// get an exception.
public String toString()
{
return( name );
}
}
2.create another class
MainClass.java
ArrayList<DoctorName> doctList = new ArrayList<DoctorName>() ;
for(int i=0;i<arr_name.length;i++)
{
doctList.add(new DoctorName(arr_id[i],arr_name[i]));
}
//fill data in spinner
//ArrayAdapter<DoctorName> adapter = new ArrayAdapter<DoctorName>(getApplicationContext(), android.R.layout.simple_spinner_dropdown_item, answers);
ArrayAdapter <DoctorName>adapter= new ArrayAdapter<DoctorName>
(getApplicationContext(), android.R.layout.simple_spinner_dropdown_item,doctList );
Doctor_selection.setAdapter(adapter);
Doctor_selection.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
{
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id)
{
DoctorName doctorName = (DoctorName) parent.getSelectedItem();
Log.i("SliderDemo", "getSelectedItemId" +doctorName.getId());
}
#Override
public void onNothingSelected(AdapterView<?> parent)
{
}
});

You have to use ArrayAdapter to show the json array values into spinner
Spinner spinner = new Spinner(this);
ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, list_values); //selected item will look like a spinner set from XML
spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(spinnerArrayAdapter);
//Set on item select Listener
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
// here you can get your selected id
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
For more check here.

Create two arrays, that is DoctorName and DoctorId
Create dynamic HashMap using above arrays, put all the values in key - value form by using for loop. But for this the length of both above arrays should be same.
HashMap<String, String> hash;
for(int i = 0; i < DoctorName.size() ; i++) {
hash = new HashMap<String, String>();
hash.put(DoctorId.get(i), DoctorName.get(i));
}
For spinner send only doctor name list from Map (hash), and onclick of spinner gets its Id that is doctorId.
Write below code in Spinner onclick
String name = spinner.getSelectedItem().toString();
String id = hash.get(name);
In id you will get the corresponding id of selected name.
Hope It helps :)

Android add items to arraylist using custom class

I'm trying to add items to an arraylist using this class template:
public class Template {
public String username;
public String email;
}
Here's the whole code:
public void JsonToArrayList(JSONArray myJsonArray) throws JSONException
{
ArrayList<Template> listItems = new ArrayList<Template>();
JSONObject jo = new JSONObject();
Template tem = new Template();
ListView lv = (ListView) findViewById(R.id.listView1);
for(int i = 0; i<myJsonArray.length(); i++)
{
jo = myJsonArray.getJSONObject(i);
tem.username = jo.getString("username");
tem.email = jo.getString("user_email");
listItems.add(tem);
Log.e("Ninja Archives", tem.username);
}
// This is the array adapter, it takes the context of the activity as a first // parameter, the type of list view as a second parameter and your array as a third parameter
ArrayAdapter<Template> arrayAdapter = new ArrayAdapter<Template>(this,android.R.layout.simple_list_item_1, listItems);
lv.setAdapter(arrayAdapter);
}
The problem is, instead of filling my listview with nice username and email strings, it's filling up with items like this:
com.android.ninjaarchives.
Template#40585690
I think somewhere along the line I have become lost, but I've been trying all sorts for ages now and getting nowhere. Can anyone point me in the right direction?
Thanks for any help.
Note: not really sure what's going on with the code; it doesn't appear to be pasting correctly.

Use below code, it can be a solution for you
public void JsonToArrayList(JSONArray myJsonArray) throws JSONException
{
ArrayList<Template> listItems = new ArrayList<Template>();
JSONObject jo = new JSONObject();
Template tem = new Template();
ListView lv = (ListView) findViewById(R.id.listView1);
String listItemString[] = new String[myJsonArray.length];
for(int i = 0; i<myJsonArray.length(); i++)
{
jo = myJsonArray.getJSONObject(i);
tem.username = jo.getString("username");
tem.email = jo.getString("user_email");
listItemString[i] = tem.username +" - " + tem.email; // u can change it according to ur need.
listItems.add(tem);
Log.e("Ninja Archives", tem.username);
}
// This is the array adapter, it takes the context of the activity as a first // parameter, the type of list view as a second parameter and your array as a third parameter
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, listItemString);
lv.setAdapter(arrayAdapter);
}
But better to write Custom adapter by extending BaseAdapter, and do listItem handling in getView method here is one simple tutorial

Take a class extending Base
private class CustomAdapter extends BaseAdapter
{
LayoutInflater inflater;
public CustomAdapter(Context context)
{
inflater = LayoutInflater.from(context);
}
public int getCount()
{
return listItems.size();
}
public Object getItem(int position)
{
return listItems.get(position);
}
public long getItemId(int position)
{
return position;
}
public View getView(final int position, View convertView,ViewGroup parent)
{
//if(convertView==null)
//convertView = inflater.inflate(R.layout.listlayout, parent, false);
Template data = (Template) getItem(position);
TextView v=new TextView(context);
v.setText(data.name);
return v;
}
}
and set adapter to your listview
lv.setAdapter(new CustomAdapter(this));

In this case you have to use a custom adapter (that extends from ArrayAdapter) and override the getView method to display in a custom layout the username and the email.