Ok, so I have an ArrayAdapter and I have this displaying rows, each row includes some text and a delete button. The delete button is my problem... I have a listener listen for click and then it calls remove(position) which removes the view. (which is what I want)... although when I call onNotifyDataSetChanged() in the UI thread it re-adds the deleted row, presumable because it's not been deleted from that list (only the view)... I'm unaware on how I can fix this.
So to summarize....
I can delete the view which I want to delete using the delete button but after onNotifyDataSetChanged() is called the view is re-added.
MainActivity
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
render = new tweetView(this);
LinearLayout canvas = (LinearLayout)findViewById(R.id.content_frame);
final ListView tweetList = (ListView)findViewById(R.id.tweetView);
tweetListFull = new ArrayList<Tweet>();
int resID = R.layout.tweet;
aa = new tweetAdapter(this, resID, tweetListFull);
Log.w("Check","Here1");
tweetList.setAdapter(aa);
Log.w("Check","Here1");
//tweetList.addView()
canvas.addView(render);
tweetList.setClickable(true);
tweetList.setOnItemClickListener(new ListView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> a, View v, int i, long l) {
try {
//Nothing here yet.
}
catch(Exception e) {
// System.out.println("Nothing here yet.);
}
}
});
// UI //
drawerListViewItems = getResources().getStringArray(R.array.items);
// get ListView defined in activity_main.xml
drawerListView = (ListView) findViewById(R.id.left_drawer);
// Set the adapter for the list view
drawerListView.setAdapter(new ArrayAdapter<String>(this,R.layout.drawer_listview_item, drawerListViewItems));
LocationManager locationManager;
locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
String provider = LocationManager.GPS_PROVIDER;
int updateTime = 5000; // 5 seconds.
int distance = 1; // meters
LocationListener myLocListener = new LocationListener(){
#Override
public void onLocationChanged(Location arg0) {
Log.w("location",String.valueOf(arg0));
twitterTest tweet = new twitterTest();
Log.w("Test","Location Changed");
Log.w("test","Long: "+String.valueOf(arg0.getLongitude())+ "Lat: "+String.valueOf(arg0.getLatitude()));
tweet.execute(arg0.getLongitude(),arg0.getLatitude()); // The argument for this is the query to search for.
}
#Override
public void onProviderDisabled(String arg0) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String arg0) {
// TODO Auto-generated method stub
}
#Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
// TODO Auto-generated method stub
}
};
locationManager.requestLocationUpdates(provider, updateTime,distance, myLocListener);
}
tweetAdapter
package com.example.networkingcoursework;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.webkit.WebView.FindListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListAdapter;
import android.widget.TextView;
public class tweetAdapter extends ArrayAdapter<Tweet>{
int resource;
Tweet tweet = null;
Context context;
//ArrayList<Tweet> tweetListFull;
public tweetAdapter(Context _context, int _resource,ArrayList<Tweet> _objects) {
super(_context, _resource, _objects);
resource = _resource;
//tweetListFull = _objects;
context = _context;
// TODO Auto-generated constructor stub
}
#Override
public View getView(final int position, View convertView, ViewGroup parent){
LinearLayout tweetView;
tweet = getItem(position);
String tweetStatus = tweet.getStatus();
if(convertView == null){
tweetView = new LinearLayout(getContext());
String inflater = Context.LAYOUT_INFLATER_SERVICE;
LayoutInflater vi = (LayoutInflater)getContext().getSystemService(inflater);
vi.inflate(resource,tweetView, true);
}
else{
tweetView = (LinearLayout) convertView;
}
TextView idView = (TextView)tweetView.findViewById(R.id.tweetText);
idView.setText(String.valueOf(tweetStatus));
Button tweetClose = (Button)tweetView.findViewById(R.id.tweetClose);
tweetClose.setOnClickListener(new OnClickListener(){
public void onClick(View v){
int i = (Integer)v.getTag();
remove(getItem(position));
notifyDataSetChanged();
}
});
tweetClose.setTag(position);
return tweetView;
}
}
It seems that you don't need notifyDataSetChanged because it holds an instance of the list from the activity. That is why the list is returning to its original state. By calling remove, it is changing the list. See this similar topic for a better explanation: notifyDataSetChanged example
As seen here, ArrayAdapter.remove() would not work with plain java arrays such as String[], and you do in MainActivity:
drawerListViewItems = getResources().getStringArray(R.array.items);
Consider to use getStringArrayList instead.
Also you don't need to manually call notifyDataSetChange(), you can see this
Related
This is the first question I am posting. Here is my question and below given is the debugged code from android studio.
Here, I have tried to extract the data by taking the data from the adapter into the mainActvity, but I failed as the app is crashing on Clicking the save button. Here the data is nothing but and object.
MainActivity :
import android.content.res.Resources;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
ArrayList<ListItem_Elements> testsList;
int n=5;//No. of tests
Button btn_save;
CustomAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView listView = (ListView)findViewById(R.id.listView);
btn_save= (Button)findViewById(R.id.btn_save);
//CustomAdapter adapter;
Resources res=getResources();//Takes the resource permission required to show ListView
testsList= new ArrayList<ListItem_Elements>();
testsList = SetList();
adapter= new CustomAdapter(this, testsList, res);
listView.setAdapter(adapter);
btn_save.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(testsList!=null)
saveValues();
}
});
}
public ArrayList<ListItem_Elements> SetList() {
/*Enter the Test names*/
ArrayList<ListItem_Elements>tests_Array= new ArrayList<ListItem_Elements>();
for(int i=0;i<5;i++) {
ListItem_Elements e = new ListItem_Elements();
e.setTest("XYZ");
e.setResult(null);
tests_Array.add(e);
}
return tests_Array;
}
ArrayList<ListItem_Elements>ar= new ArrayList<>();
public void saveValues() {
if(adapter.extractedArray!=null) {
ar = adapter.extractedArray;
Toast.makeText(MainActivity.this, ar.size(), Toast.LENGTH_SHORT).show();
}
}
}
--------------------------------------------------------------------------------
CustomAdapter :
import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.TextView;
import java.util.ArrayList;
public class CustomAdapter extends BaseAdapter {
private Activity activity;
public static ArrayList<ListItem_Elements> extractedArray= new ArrayList<ListItem_Elements>();
private ArrayList<ListItem_Elements> array;
//Declaration of ArrayList which will be used to recieve the ArrayList that has to be putup into the ListView
private LayoutInflater inflater; //To Instantiates a layout XML file into its corresponding View
Resources res;
//protected String bridgeValue;
CustomAdapter(Activity a, ArrayList<ListItem_Elements> b, Resources resLocal) {
activity = a;
array= b;
res = resLocal;
//Initialization of inflater to link the layout of list items
inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public CustomAdapter() {
}
#Override
public int getCount() {
return array.size();
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return position;
}
// keeping references for views we use view holder
public static class ViewHolder {
/*Declaration of elements of layout of list items in the class for future use of putting up
data onto the List View*/
TextView textView;
EditText editText;
}
#Override
//Here views were bound to a position
public View getView(int position, View convertView, ViewGroup parent) {
View vi = convertView;
ViewHolder holder;
// if a view is null(which is for the first item) then create view
if (convertView == null) {
vi = inflater.inflate(R.layout.layout_items, null);
// Taking XML files that define the layout of items, and converting them into View objects.
holder = new ViewHolder();//Stores the elements of the layout of list items
/*Initializing the elements of the layout of list item*/
holder.textView = (TextView) vi.findViewById(R.id.textView);
holder.editText = (EditText) vi.findViewById(R.id.editText);
vi.setTag(holder);
//Stores the view(layout of list item) into vi
}
//else if it already exists, reuse it(for all the next items). Inflate is costly process.
else {
holder = (ViewHolder) vi.getTag();
//Restores the already exisiting view in the 'vi'
}
/*Setting the arrayList data onto the different elements of the layout of list item*/
try {
holder.textView.setText(array.get(position).getTest());
if(holder.editText.getText()!=null) {
ListItem_Elements obj = new ListItem_Elements();
obj.setTest(array.get(position).getTest());
obj.setResult(holder.editText.getText().toString());
extractedArray.add(position, obj);
}
}
catch (Exception e) {
e.getMessage();
}
return vi;//Returns the view stored in vi i.e contents of layout of list items
}
}
--------------------------------------------------------------------------------
public class ListItem_Elements {
String test;
String result;
ListItem_Elements() {
}
public String getTest() {
return test;
}
public void setTest(String test) {
this.test = test;
}
public String getResult() {
return result;
}
public void setResult(String result) {
this.result = result;
}
}
You are missing some necessary code. EditText has a method called addTextChangedListener() which accepts a TextWatcher implementation. This implementation would be responsible for updating the data in the adapter.
final ListItem_Elements item = array.get(position);
holder.textView.setText(item.getTest());
holder.editText.setText(item.getResult());
holder.editText.addTextChangedListener(new TextWatcher() {
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
item.setResult(s.toString());
}
// omitted empty impls for beforeTextChanged() and afterTextChanged(), you need to add them
});
Now, everytime the user updates the EditText, your adapter value will be updated. Then you just get the array values:
public void saveValues() {
// testLists in the activity and array in the adapter are references
// to the same list. So testLists already has the updated results
}
And take out this whole block of code:
holder.textView.setText(array.get(position).getTest());
if(holder.editText.getText()!=null) {
ListItem_Elements obj = new ListItem_Elements();
obj.setTest(array.get(position).getTest());
obj.setResult(holder.editText.getText().toString());
extractedArray.add(position, obj);
}
It doesn't do the right thing.
you are filling the listView with value from an ArrayList. Why you don't just get values from the your ArrayList ??
public void saveValues() {
if(tests_Array!=null) {
//and here you get values from your list
//by a simple for instruction
Toast.makeText(MainActivity.this, tests_Array.size(), Toast.LENGTH_SHORT).show();
}
}
I am writing a code in Android to refresh a Gridview in every 2 mins. I searched a lot in the web but i don't find any specific technique to do it.
Java Code
MainActivity.java
package com.example.mycustomgridrefresh;
import java.util.ArrayList;
import android.os.Bundle;
import android.widget.GridView;
import android.app.Activity;
public class MainActivity extends Activity
{
GridView gd;
MyGrid mg;
ArrayList<String> abc;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gd = (GridView)findViewById(R.id.gd);
abc = new ArrayList<String>();
for(int i=0;i<100;i++)
{
abc.add(String.valueOf(i));
}
mg = new MyGrid(this,this,abc);
gd.setAdapter(mg);
}}
MyGrid.java
package com.example.mycustomgridrefresh;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
public class MyGrid extends BaseAdapter
{
ArrayList<String> abc;
Activity activity;
public MyGrid(Activity activity , Context cont,ArrayList<String> abc)
{
super();
this.abc = abc;
this.activity = activity;
}
#Override
public int getCount()
{
return abc.size();
}
#Override
public Object getItem(int arg0)
{
return abc.get(arg0);
}
#Override
public long getItemId(int arg0)
{
return 0;
}
public class ViewHolder
{
public TextView txt;
}
#Override
public View getView(int arg0, View arg1, ViewGroup arg2)
{
ViewHolder view;
LayoutInflater inflator = activity.getLayoutInflater();
if(arg1==null)
{
view = new ViewHolder();
arg1 = inflator.inflate(R.layout.mygrid, null);
view.txt = (TextView) arg1.findViewById(R.id.txt);
arg1.setTag(view);
}
else
{
view = (ViewHolder) arg1.getTag();
}
view.txt.setText(abc.get(arg0));
return arg1;
}
}
This above Grid is printing 100 numbers is 10 rows & columns. I want to change the value of the grid cells for each 2mins. The value should to change to +1.
Please suggest me some good solution.
Thanks in Advance !!!
To refresh the values you need to call in MyGrid:
notifyDataSetChanged()
To do any task each 2 mins you need to create other thread, something like this:
public void startRunnable(){
Runnable r = new Runnable() {
#Override
public void run() {
while(needToRefresh){
//add one...
this.notifyDataSetChanged();
Thread.sleep(2000);
}
}
};
this.activity.runOnUiThread(r);
}
Don't forget to stop the needToRefresh condition onPause, onStop.
EDIT: Because notifyDataSetChanged() need to be call in UI thread, you need to call runnable using this.activity.runOnUiThread
See there: How to use notifyDataSetChanged() in thread
I have created a listView activity which opens dialog boxes on item click. In the dialog box, the users can enter different values, in an editText, which are saved in a textView, in the same list view item. That's working perfect, the problem is that if I close the application, when I open it again, the values saved, aren't there anymore. How to keep the value after closing the application?
I tried working with SharedPrefences, but the problem was that values are different for each row in the listView, so just sharing the TextView wasn't working. Then I tried something else, but for a week I got stuck into many NullPointerExceptins and I couldn't have done nothing so far on that way.
Here is my:
Adapter - NoteAdapater.java:
package com.cngcnasaud.orar;
import android.app.Dialog;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class NoteAdapter extends BaseAdapter {
String[] result;
Context context;
private static LayoutInflater inflater = null;
private Dialog dialog;
public NoteAdapter(Note note, String[] prgmNameList, String[] saved) {
// TODO Auto-generated constructor stub
result = prgmNameList;
context = note;
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return result.length;
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return result.length;
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public class Holder {
TextView tv;
public TextView text;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
final Holder holder = new Holder();
View rowView;
rowView = inflater.inflate(R.layout.note_items, null);
holder.tv = (TextView) rowView.findViewById(R.id.textView1);
holder.text = (TextView) rowView.findViewById(R.id.textView2);
holder.tv.setText(result[position]);
rowView.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
dialog = new Dialog(context);
dialog.setContentView(R.layout.dialog);
dialog.setTitle("Materie:" + result[position]);
final EditText txtMode = (EditText) dialog
.findViewById(R.id.dialog);
Button btnSave = (Button) dialog.findViewById(R.id.bsave);
btnSave.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
String data = txtMode.getText().toString();
holder.text.setText(data);
dialog.dismiss();
Log.d("data", data);
}
});
dialog.show();
}
});
return rowView;
}
}
And constructor - Note.java:
package com.cngcnasaud.orar;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.Menu;
import android.widget.ListAdapter;
import android.widget.ListView;
public class Note extends Activity {
public static final ListAdapter NoteAdapter = null;
ListView lv;
Context context;
ArrayList<?> prgmName;
public static String[] prgmNameList = { "Romana - ", "Matematica - ",
"Lb. Engleza - ", "Lb. Germana/Franceza - ", "Istorie - ",
"Geografie - ", "Biologie - ", "Fizica - ", "Ed. Fizica - " };
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.note_listview);
context = this;
lv = (ListView) findViewById(R.id.listView);
lv.setAdapter(new NoteAdapter(this, prgmNameList, null));
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
You are loosing the data because your data is static, you have define it in
prgmNameList = { "Romana - ", "Matematica - ",
"Lb. Engleza - ", "Lb. Germana/Franceza - ", "Istorie - ",
"Geografie - ", "Biologie - ", "Fizica - ", "Ed. Fizica - " };
Every time you close the app it will pick that data. In order to save the changes you need to implement a form of storage. Check the Android training page: Saving Data
I think the best option is to make a database Saving Data in SQL Databases
Use SQLite datbase for storing the data,It is static database kept all the values until uninstallation of the app.
Another way is use some online database using web-service.
For example RESTFUL webservice
Now i try to use adapter . But i dont understand how to set value from data .Becuase in friends = db.selectall ,value in friend have 3 value(fname,lname,nickname).So my question is How to set value(fname/lname/nickname OR one or the other) My code NOW look like this ::::
package com.example.sqlite;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.example.sqlite.db.FriendsDB;
import com.example.sqlite.entry.FriendEntry;
public class FriendsListActivity extends Activity {
private Context context;
private FriendsDB db;
private ArrayList<FriendEntry> friends;
private ArrayList<String> data;
private TextView hellotext;
private ListView hellolistview;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.friendlist_layout);
}
public void showAllList(){
//view matching
hellotext = (TextView) findViewById(R.id.hellotext);
hellolistview = (ListView) findViewById(R.id.hellolistview);
//select data
friends = db.selectAll();
if(friends.size()==0){
Toast.makeText(context,"You dont have any friend.",Toast.LENGTH_SHORT).show();
}else{
data = new ArrayList<String>();
for (int i = 1;i<=friends.size();i++){
// set value for data
**data.add("Your Name is "+friends["fname"]);<< I want to add data like this .How to correct**
}
}
}
private class adapter extends BaseAdapter{
private Holder holder;
#Override
//ดาต้ามีกี่แถว
public int getCount() {
// TODO Auto-generated method stub
return friends.size();
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
#Override
public View getView(int position, View view, ViewGroup parent) {
//create
if( view == null){
view = LayoutInflater.from(getApplicationContext()).inflate(R.layout.item_layout,null);
holder = new Holder();
holder.title = (TextView) view.findViewById(R.id.item_title);
view.setTag(holder);
}else{
holder = (Holder) view.getTag();
}
//assign data / wait for data
return null;
}
private class Holder{
//view แต่ละตัวเก็บค่าอะไรบ้าง
public TextView title;
}
}
}
When you have data in Cursor and you want to display it in a ListView, you need to use a CursorAdapter.
You can either use the pre-defined SimpleCursorAdapter or if you want custom views, you can extend the CursorAdapter class.
Tutorial here: http://thinkandroid.wordpress.com/2010/01/11/custom-cursoradapters/
You are doing it allmost all right , but I suggest you to use an ArrayList of HashMap type instead of using Friends class.
This will lower your application burden.
ArrayList<HashMap<Object,String>> list=new ArrayList<HashMap<Object,String>>();
HashMap<Object,String> hm;
in your select all method
do{
hm=new HashMap<Object,String>();
hm.add(Key_Name,"retrieve the value from cursor here");
list.add(hm);
}while(c.movetonect());
return list;
in your activity
ArrayList<HashMap<Object,String>> list=new ArrayList<HashMap<Object,String>>();
list=db.selectAll();
HashMap<Object,String> hm;
for (int i=0;i<list.length;i++){
hm=list.getIndex(i); //retrieve all the vaalues here
}
use list adapters which accept list to populate the listview
I have defined onCheckedChanged for the checkbox in my listview.
When i click on the check box to check / uncheck it this function is getting invoked.
But when i setthe state of the check box from code like
check.setChecked(true);
the onCheckedChanged is not getting invoked.
Please help.
Adapter file :
package com.idg.project.adapters;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.ImageView;
import android.widget.TextView;
import com.idg.project.R;
import com.idg.project.activities.ScanListActivity;
import com.idg.project.activities.SearchResultActivity;
import com.idg.project.adapters.WishListAdapter.ViewHolder;
import com.idg.project.entity.ScannedProduct;
public class ScanListAdapter extends BaseAdapter {
private Context context;
private List<ScannedProduct> productList;
protected LayoutInflater mInflater;
Button showOrHideButton;
static public int count = 0;
String barcodeForSelectedRow;
String formatForSelectedRow;
OnItemClickListener rowListener;
Activity parentActivity;
boolean isWishList;
public ScanListAdapter(Context context, List<ScannedProduct> objects,
Button button, Activity parentActivity) {
super();
this.productList = objects;
this.context = context;
this.mInflater = LayoutInflater.from(context);
showOrHideButton = button;
this.parentActivity = parentActivity;
this.isWishList = isWishList;
}
public int getCount() {
return productList.size();
}
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
#Override
public void notifyDataSetChanged() {
// TODO Auto-generated method stub
super.notifyDataSetChanged();
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
final int pos = position;
Log.i("checkboxflag at : ", pos+"is"+(productList.get(pos).getCheckboxflag()));
Log.i("getview : fresh", "getview"+pos);
convertView = mInflater.inflate(R.layout.product_list_row, null);
holder = new ViewHolder();
holder.text1 = (TextView) convertView.findViewById(R.id.productid);
holder.text1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(parentActivity,
SearchResultActivity.class);
intent.putExtra("barcode", productList.get(pos)
.getBarcode());
intent.putExtra("format", productList.get(pos).getFormat());
intent.putExtra("IsScan", false);
Log.i("", "" + productList.get(pos).getBarcode());
parentActivity.startActivity(intent);
Log.i("", "" + pos);
}
});
holder.text2 = (TextView) convertView.findViewById(R.id.price);
// holder.text2.setOnClickListener(listener);
holder.image = (ImageView) convertView
.findViewById(R.id.productimageid);
convertView.setTag(holder);
// holder.image.setOnClickListener(listener);
holder.text1.setText(productList.get(position).getTitle());
holder.text2.setText(productList.get(position).getPrice().toString());
if (productList.get(position).getSmallImage() != null) {
byte[] bb = (productList.get(position).getSmallImage());
holder.image.setImageBitmap(BitmapFactory.decodeByteArray(bb, 0,
bb.length));
} else {
holder.image.setImageBitmap(null);
holder.image.setBackgroundResource(R.drawable.highlight_disabled);
}
// holder.image.setImageBitmap(Utils.loadBitmap(productList.get(position).getSmallImage()));
final CheckBox check = (CheckBox) convertView
.findViewById(R.id.checkbox);
check.setClickable(true); // to remove anything carried over from prev convert view
if(productList.get(pos).getCheckboxflag()==1)
{
Log.i("CheckBox set checked",""+pos);
check.setChecked(true);
}
else{
Log.i("CheckBox set unchecked",""+pos);
check.setChecked(false);
}
setWishListItemsInScanList(pos, convertView);
check.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
Log.i("OnclickListener","Current Position"+pos);
if (check.isChecked()
&& productList.get(pos).getWishListFlag() == 0) {
if(check.isClickable()){
Log.i("CheckBox check",""+pos);
ScanListActivity.updateCheckBoxSelection(1, pos);
ScanListAdapter.count++;
}
} else if (!check.isChecked()
&& productList.get(pos).getWishListFlag() == 0){
if(check.isClickable()){
ScanListActivity.updateCheckBoxSelection(0, pos);
ScanListAdapter.count--;
Log.i("CheckBox UNcheck",""+pos);
}
}
if (ScanListAdapter.count == 0) {
// showOrHideButton.setClickable(false);
// showOrHideButton.setVisibility(View.GONE);
showOrHideButton.setEnabled(false);
} else {
// showOrHideButton.setVisibility(View.VISIBLE);
showOrHideButton.setEnabled(true);
}
}
});
return convertView;
}
private void setWishListItemsInScanList(int pos, View convertView) {
if (productList.get(pos).getWishListFlag() == 1) {
Log.i("CheckBox set checked from wish list",""+pos);
CheckBox check = (CheckBox) convertView.findViewById(R.id.checkbox);
check.setClickable(false);
check.setChecked(true);
}
}
static class ViewHolder {
TextView text1;
ImageView image;
TextView text2;
}
}
List activity file :
package com.idg.project.activities;
import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.idg.project.R;
import com.idg.project.adapters.WishListAdapter;
import com.idg.project.adapters.ScanListAdapter;
import com.idg.project.entity.ScannedProduct;
import com.idg.project.services.ScannedProductDataAccessManager;
public class ScanListActivity extends BaseActivity {
static Button scanlist;
ScanListAdapter listAdapter;
static List<ScannedProduct> productList;
/* Notes for the Developer :
* For tracking the checked items Checkboxflag
* is maintained.
* Point1 : Select all will just set this flag in the local list and then call notifyDatachange of the adapter
* within adapter the check box is set or reset based on this flag for each row
*
* Point 2: When individual rows are selected , there is an onclick of the check box is invoked
* Here the Checkboxflag of the local list is set /unset . Also we need a way to knpw the select all button is
* to enabled or diabled. for that Count variable is updated here.
* Now Important point is these two actions shoulnt be taking place if the checkbox state change due to select all
* So there is a special check of isclickable in the onclicklistener
*
* Point 3: In scan list the items in the wish list are to be marked. This again needs special logic.
* This is done in the adapter code by checking all the rows whose wishListFlag is 1 and making it non clickable
*
* Important : Listview has the concept of ViewGroup and each view group is usually the rows fitting in the display screen
* so when we scroll, the viewGropu changes.
* Convertview is get reused for view groups. So need to careful undesired values that will be carried to next viewgroup*/
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.scan_list);
productList = new ArrayList<ScannedProduct>();
productList = getProductList();
for(int i=0;i<productList.size();i++){
Log.i("checkboxflag at : ", i+"is"+(productList.get(i).getCheckboxflag()));
}
final ListView lv = (ListView) findViewById(R.id.list);
scanlist = (Button) findViewById(R.id.addtowishlist);
scanlist.setEnabled(false);
listAdapter = new ScanListAdapter(this, productList, scanlist, this);
lv.setAdapter(listAdapter);
}
private List<ScannedProduct> getProductList() {
List<ScannedProduct> productList = new ArrayList<ScannedProduct>();
ScannedProductDataAccessManager productDataBaseManager = new ScannedProductDataAccessManager(
getApplicationContext());
String[] colList = { "title", "smallImage", "price" };
productList = productDataBaseManager.fetchAllProducts();
return productList;
}
static boolean selectFlag = false;
public void selectAll(View view) {
ListView listView = (ListView) findViewById(R.id.list);
view = findViewById(R.id.select_all);
if (selectFlag == false) {
for (int i = 0; i < listView.getAdapter().getCount(); i++) {
productList.get(i).setCheckboxflag(1);
}
view.setBackgroundResource(R.drawable.login_remme_dwn_btn);
selectFlag = true;
TextView text=(TextView) findViewById(R.id.select);
text.setText("Unselect All");
scanlist.setEnabled(true);
} else {
for (int i = 0; i < listView.getAdapter().getCount(); i++) {
productList.get(i).setCheckboxflag(0);
}
view.setBackgroundResource(R.drawable.login_remme_up_btn);
selectFlag = false;
TextView text=(TextView) findViewById(R.id.select);
text.setText("Select All");
scanlist.setEnabled(false);
}
((BaseAdapter)listView.getAdapter()).notifyDataSetChanged(); // we are only setting the flags in the list
// so need to notify adapter to reflect same on checkbox state
//listView.refreshDrawableState();
}
public void addToWishList(View view) {
ListView listView = (ListView) findViewById(R.id.list);
for (int i = 0; i < listView.getAdapter().getCount(); i++) {
ScannedProduct product = productList.get(i);
if (product.getWishListFlag() == 0 && product.getCheckboxflag()==1) {
product.setWishListFlag(1);
new ScannedProductDataAccessManager(getApplicationContext())
.updateProduct(product, "title",
new String[] { product.getTitle() });
product.setCheckboxflag(0);
//ScanListAdapter.count--;
}
Log.i("ScanList selected", product.getTitle());
}
Toast.makeText(getApplicationContext(),
"Added selected items to Wish List", Toast.LENGTH_SHORT).show();
scanlist.setEnabled(false);
((BaseAdapter)listView.getAdapter()).notifyDataSetChanged();
}
static public void updateCheckBoxSelection(int flag,int pos){ // when individual row check box is checked/ unchecked
// this fn is called from adapter to update the list
productList.get(pos).setCheckboxflag(flag);
}
}
Since your checkbox is inside listview, so you need to call notifyDataSetChanged method on your list's adapter to refresh it's contents.
update
instead of ((BaseAdapter)listView.getAdapter()).notifyDataSetChanged();, try calling listAdapter.notifyDataSetChanged();
I got the answer / bug in my code
i am not reusing convertview so its every time a new holder.
I am changing the flag of the checkbox and then assigning a statechange listener for the checkbox
thus its not getting invoked
when i changed the order to assign checkchangelistener before actually changing the state , its working as expected. The listener is getting called.
thanks all of you