Develop Reference

How to create two different LinearLayout in a same ListView?

i want to combine two LinearLayout, both have different TextView arrangement in them, in a single ListView. so the final look should be like below:
and i run it with my code, but the app wouldn't start. below are my code.
Activity class:
public class MainActivity extends Activity {
// Create list of items
String[] publicModeItems = {
"AAAAA",
"BBBBB"
};
String[] publicModeParameters = {
"YES",
"NO"
};
String[] publicModeResetExe = {
"CCCCC",
"DDDDD"
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
populateListView();
}
private void populateListView() {
CustomList adapter1 = new CustomList(this, publicModeItems, publicModeParameters);
// Build adapter
ArrayAdapter<String> adapter2 = new ArrayAdapter<String>(
this, // context for the activity
R.layout.text_view_test, // layout to use (create)
publicModeResetExe); // items to display
// Configure the list view
ListView list = (ListView) findViewById(R.id.PublicModeListView);
list.setAdapter(adapter1);
list.setAdapter(adapter2);
}
private class CustomList extends ArrayAdapter<String> {
private final Activity context;
private final String[] publicModeItems;
private final String[] publicModeParameters;
public CustomList(Activity context,
String[] publicModeItems,
String[] publicModeParameters) {
super(context, R.layout.text_views_1, publicModeItems);
this.context = context;
this.publicModeItems = publicModeItems;
this.publicModeParameters = publicModeParameters;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
LayoutInflater layoutinflater = context.getLayoutInflater();
View rowView = layoutinflater.inflate(R.layout.text_views_1, null, true);
TextView txtPublicModeItems = (TextView) rowView.findViewById(R.id.PublicModeItems);
TextView txtPublicModeParameters = (TextView) rowView.findViewById(R.id.PublicModeParameters);
txtPublicModeItems.setText(publicModeItems[position]);
txtPublicModeParameters.setText(publicModeParameters[position]);
return rowView;
}
}
}
text_views_1 xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/PublicModeLayoutForTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="#+id/PublicModeItems"
android:layout_width="200sp"
android:layout_height="wrap_content"
android:textColor="#drawable/text_color_change" />
<TextView
android:id="#+id/PublicModeOpenBracket"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="["
android:textColor="#drawable/text_color_change" />
<TextView
android:id="#+id/PublicModeParameters"
android:layout_width="100sp"
android:layout_height="wrap_content"
android:gravity="end"
android:textColor="#drawable/text_color_change" />
<TextView
android:id="#+id/PublicModeCloseBracket"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="]"
android:textColor="#drawable/text_color_change" />
</LinearLayout>
text_view_test xml:
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textColor="#drawable/text_color_change" >
</TextView>
activity_main xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/PublicModeListViewLayout01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#color/black"
android:baselineAligned="true"
android:orientation="vertical"
tools:context="com.example.mycalendar.MainActivity" >
<LinearLayout
android:id="#+id/PublicModeListViewLayout02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="#drawable/custom_border"
android:padding="5dp" >
<ListView
android:id="#+id/PublicModeListView"
android:layout_width="308dp"
android:layout_height="wrap_content"
android:choiceMode="singleChoice"
android:listSelector="#color/yellow"
android:smoothScrollbar="true" >
</ListView>
</LinearLayout>
</LinearLayout>
Problem : I just run my code just now, and only 'CCCCC' and 'DDDDD' is showing. so do you have any idea on this?

You should inherit your list adapter from BaseAdapter rather than ArrayAdapter.
Rewrite adapter's getView() method to inflate layout according position, like below.
public View getView(int position, View convertView, ViewGroup parent) {
...
View rootView = null;
if (position == 0 || position == 1) {
rootView = layoutinflater.inflate(R.layout.text_views_1, null, true);
} else {
rootView = layoutinflater.inflate(R.layout.text_views, null, true);
}
...
return rootView;
}

You set the list adapter twice
list.setAdapter(adapter1);
list.setAdapter(adapter2);
in this case the current adapter is the second, not them both.
Use ListView with SimpleAdapter or a custom adapter and that will solve all your problems, check out this for SimpleAdapter tutorial to learn a the basics and this tutorial to learn how you can make multiple views instead of just 1. This tutorial is about creating custom adapter
BTW, I have few comments on your code and xml layout
First, there is no need for 2 TextViews for your bracket, you can easily add them programmatically to the String[] or even to YES/NO TextView.
Second, You're not using a ViewHolder in your CustomList adapter and this is not a good practice as every time you scroll your list, it creates new view although it can use already existing one.

I already solve this problem. but it seems not so convenient to use this method.
public class PublicModeActivity extends Activity {
// Create list of items
String[] publicModeItems = {
"AAAAA",
"BBBBB"
};
String[] publicModeParameters = {
"YES",
"NO"
String[] publicModeResEx = {
"",
"",
"CCCCC",
"DDDDD"
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
populateListView();
}
private void populateListView() {
CustomList adapter = new CustomList(this, publicModeItems, publicModeParameters, publicModeResEx);
// Configure the list view
ListView list = (ListView) findViewById(R.id.PublicModeListView);
list.setAdapter(adapter);
}
private class CustomList extends BaseAdapter {
private final Activity context;
private final String[] publicModeItems;
private final String[] publicModeParameters;
private final String[] publicModeResEx;
public CustomList(Activity context,
String[] publicModeItems,
String[] publicModeParameters,
String[] publicModeResEx) {
super();
this.context = context;
this.publicModeItems = publicModeItems;
this.publicModeParameters = publicModeParameters;
this.publicModeResEx = publicModeResEx;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
LayoutInflater layoutinflater = context.getLayoutInflater();
View rowView = null;
Log.i("PublicModeActivity", "" + position);
if (position < 2) {
rowView = layoutinflater.inflate(R.layout.text_views_1, null, true);
TextView txtPublicModeItems = (TextView) rowView.findViewById(R.id.PublicModeItems);
TextView txtPublicModeParameters = (TextView) rowView.findViewById(R.id.PublicModeParameters);
txtPublicModeItems.setText(publicModeItems[position]);
txtPublicModeParameters.setText(publicModeParameters[position]);
} else {
rowView = layoutinflater.inflate(R.layout.text_view_test, null, true);
TextView txtPublicModeResEx = (TextView) rowView.findViewById(R.id.PublicModeResEx);
txtPublicModeResEx.setText(publicModeResEx[position]);
}
return rowView;
}
#Override
public int getCount() {
return 4;
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return position;
}
}
}
I need to put that blank string "", to match the number of row with the upper layout (text_views_1) even-though those blank string are use in different layout. so it is not so convenient especially when you want to display so many data. If someone here have much simpler method than this. feel free to share with me/us. i'm eager to learn. thank you!

String Array With Custom Adapters

Can we use String array with custom adapter and data should be display in Listview?
I mean something like that
String [] s= {"cars","bike","train"};
Now how this string array will attach with Custom adapter and how data will show in the ListView.
I know this is easy with ArrayList.
But I want to do it with simple String Array.

Well, you can use a custom adapter for that. But you could also use the ArrayAdapter class if you just want to show text on your ListView.
But, if for whatever reason you want to create a custom adapter, try the following...
In this particular case I'm subclassing the BaseAdapter class.
This custom adapter will take hold of my data model, and will inflate the data to my ListView rows.
First, I'll create the XML of my custom row. You can see the code below.
item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Test text"
android:id="#+id/tv"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"/>
</RelativeLayout>
Here I've created a row that displays a text.
Now, I'll create my custom adapter to handle this XML. As you can see below.
MyAdapter.java
public class MyAdapter extends BaseAdapter {
private static final String LOG_TAG = MyAdapter.class.getSimpleName();
private Context context_;
private ArrayList<String> items;
public MyAdapter(Context context, ArrayList<String> items) {
this.context_ = context;
this.items = items;
}
#Override
public int getCount() {
return items.size();
}
#Override
public Object getItem(int position) {
return items.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater mInflater = (LayoutInflater)
context_.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.item_mail, null);
}
TextView tv = (TextView) convertView.findViewById(R.id.tv);
String text = items.get(position);
Log.d(LOG_TAG,"Text: " + text);
tv.setText(text);
return convertView;
}
}
Ok. Now we have everything to make this work. In your Activity class, do something like that:
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin" tools:context=".MainActivity">
<TextView
android:text="#string/hello_world"
android:id="#+id/tv_header"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/tv_header">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add item"
android:id="#+id/button"
android:layout_gravity="center" />
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/listView" />
</LinearLayout>
</RelativeLayout>
MainActivity.java
public class MainActivity extends ActionBarActivity {
private int numItem = 1; // Dummy int to create my items with different numbers.
private MyAdapter myAdapter; // Your custom adapter.
private ArrayList<String> items; // This is going to be your data structure, every time you change it, call the notifyDataSetChanged() method.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button bt = (Button) findViewById(R.id.button);
ListView lv = (ListView) findViewById(R.id.listView);
items = new ArrayList<>();
myAdapter = new MyAdapter(this,items);
lv.setAdapter(myAdapter);
bt.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
addItem(); // The method I'm using to insert the item. Look for it below.
}
});
}
private void addItem() {
items.add("Text " + numItem++);
mailAdapter.notifyDataSetChanged(); // Notifying the adapter that my ArrayList was modified.
}
}
This should do the trick.
From what you told me, you want to use a String array instead of a ArrayList<String>. Well, change the adapter to the following.
MyAdapter.java
public class MyAdapter extends BaseAdapter {
private static final String LOG_TAG = MyAdapter.class.getSimpleName();
private Context context_;
private String[] items;
public MyAdapter(Context context, String[] items) {
this.context_ = context;
this.items = items;
}
#Override
public int getCount() {
return items.length;
}
#Override
public Object getItem(int position) {
return items[position];
}
#Override
public long getItemId(int position) {
return position;
}
// Rest of the code... Same as before.
}
MainActivity.java
public class MainActivity extends ActionBarActivity {
private MyAdapter myAdapter; // Your custom adapter.
private String[] items;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button bt = (Button) findViewById(R.id.button);
ListView lv = (ListView) findViewById(R.id.listView);
items = {"Whatever","String","You","Like"};
myAdapter = new MyAdapter(this,items);
lv.setAdapter(myAdapter);
}
}
The problem with this approach: Your adapter will have a fixed size, which will be the size of your String array once you create it. And you won't be able to make it bigger, unless you create another adapter with a different String array.
This question discusses this matter.

Populate ListView with ArrayList item on button click

I have an arraylist List<Cars> myCars = new ArrayList<Cars>(); My MainActivity layout has a listview and a button. There is one more layout
("each_car.xml") and its content is as below:-
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="#+id/tv_carName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
<TextView
android:id="#+id/tv_carMaker"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
</LinearLayout>
</LinearLayout>
My Cars class has two fields,"name" and "manufacturer".
public class Cars{
String name;
String manufacturer;
}
I am populating this list(myCars) through an async-task. After the task is complete i.e. inside onPostExecute(), I am calling a method in my MainActivity
which will populate a listview with the items in the list. Below is the method :-
public void populateListView(List<Cars> data){
ArrayAdapter<Cars> carAdapter = new CarAdapter(MainActivity.this, data);
ListView dataList = (ListView) findViewById(R.id.car_listView);
dataList.setAdapter(carAdapter);
}
Below is my CarAdapter class :-
public class CarAdapter extends ArrayAdapter<Cars>{
private LayoutInflater inflater;
List<Cars> dummyData = new ArrayList<Cars>();
MainActivity host;
public CarAdapter(MainActivity host, List<Cars> data)
{
super(host,R.layout.each_car,data);
inflater = host.getWindow().getLayoutInflater();
dummyData = data;
}
#Override
public View getView(int position, View convertView, ViewGroup parent)
{
View itemView = convertView;
if(itemView == null)
{
itemView = inflater.inflate(R.layout.each_car,parent,false);
}
Cars currentData = dummyData.get(position);
Log.d("Testing Position","Position :- "+position);
TextView carName = (TextView) itemView.findViewById(R.id.tv_carName);
carName.setText(currentData.getName());
TextView carMaker = (TextView) itemView.findViewById(R.id.tv_carMaker);
carMaker.setText(currentData.getManufacturer());
return itemView;
}
}
This is filling out the listview with the entire List (myCars) at once.
Problem :- I want to populate the listView with one item at a time when I click the button.I am not sure how should I modify my code.

Check this link for custom adapterenter link description here. Once the list is populated pass the list into constructor of adapter and don't forget to call notifydatasetchanged. It will update the listview whenever an new item is added or removed from a listview.

This may help you ...
public class car extends AsyncTask<Void, Void, ArrayList<Cars> {
#Override
protected ArrayList<Cars> doInBackground(Void... params) {
... add your list here...
return myCars ;
}
#Override
protected void onPostExecute(ArrayList<Cars> result) {
super.onPostExecute(result);
//as per your requirement
adapter_car = new SimpleAdapter(ExchangeRateActivity.this, result,
R.layout.row, from, to);
list_view.setAdapter(adapter_car);
}

Here is a sample and easy way first you want to give the elements of 0 index element then on the next click you first clear the listview and then call your Adapter class with 2 element and repeat the same thing with some counter that takes the number of click and call you Adapter class with the limit of that Array list May be this Strategy help you..

Here are a couple of tutorials. You need to do some research and follow tutorials if you do not know what to do. link one, link two and link three
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<ListView
android:id="#+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"></ListView>
</RelativeLayout>
adapter class
public class myListAdapter extends BaseAdapter{
List<String> item_list = new ArrayList<String>();
public myListAdapter(){
}
void add(String item_text){
item_list.add(item_text);
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return item_list.size();
}
#Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
#Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
#Override
public View getView(int position, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.list_item, null);
TextView tvText = (TextView)view.findViewById(R.id.list_text);
tvText.setText(item_list.get(position));
return null;
}
}
list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView
android:id="#+id/list_text"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
Implementation in onCreate:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myListAdapter adapter = new myListAdapter();
ListView list = (ListView) findViewById(R.id.list);
adapter.add("Some value");
list.setAdapter(adapter);
}

expandablelistview in fragment with master/detail flow

I am trying to create a master/detail flow application on Android 4.2.
I have created a master detail flow project, but I want to implement an ExpandableListView instead of the ListView that is provided.
The master/detail uses fragments, and here’s where I am stuck… I have successfully created an expandable list view in a separate project. How can I implement it inside a master/detail flow?

I assume you used the IDE wizard to create the Master/Detail example project. If this is so, then you probably saw that the wizard created an ItemListFragment class which by default extends ListFragment.
If you need to replace the simple list with an expandable one, then you'll have to:
Extend from Fragment, instead of ListFragment
Create an xml layout file where you declare an ExpandableListView
Override onCreateView() and inflate the layout that contains the ExpandableListView
Get a reference to the ExpandableListView, and then use it as you did before.
Something like this:
// extend from Fragment
public class ItemListFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// inflate the layout that contains the ExpandableListView
View view = inflater.inflate(R.layout.fragment_items_list, container, false);
// get a reference to ExpandableListView
ExpandableListView list = (ExpandableListView)view.findViewById(R.id.my_list);
// set the adapter
// set listeners
return view;
}
}

I have no idea how to create ExpandableListView, but you can achieve with custom listview like I implemented in my Project
1. Create Custom list row
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#00000000" >
<RelativeLayout
android:id="#+id/rel_main"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true" >
<TextView
android:id="#+id/text1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginRight="18dp"
android:layout_marginTop="17dp"
android:layout_toLeftOf="#+id/imageView1"
android:paddingBottom="15dp"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#685f56" />
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignTop="#+id/text1"
android:layout_marginRight="16dp"
android:layout_marginTop="5dp"
android:src="#drawable/highlight_icon" />
</RelativeLayout>
<RelativeLayout
android:id="#+id/relativeLayout1"
android:layout_width="fill_parent"
android:layout_height="300dp"
android:layout_alignParentLeft="true"
android:layout_below="#+id/rel_main"
android:visibility="gone" >
</RelativeLayout>
<View
android:id="#+id/view1"
android:layout_width="fill_parent"
android:layout_height="1dp"
android:layout_alignParentLeft="true"
android:layout_below="#+id/relativeLayout1"
android:background="#685f56" />
</RelativeLayout>
**2. Create Custom Adapter in "ItemListFragment.java" **
public class CustomAdepeterNewJob extends BaseAdapter{
//String[] tablecontent;
int Click=0;
Map<String, DummyItem> tablecontent = new HashMap<String, DummyItem>();
Context context;
public CustomAdepeterNewJob(Context context, Map<String, DummyItem> titles)
{
this.context = context;
this.tablecontent = titles;
}
public class ViewHolder {
public TextView txt;
public ImageView img;
public RelativeLayout relativeLayout1,rel_main;
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return tablecontent.size();
}
#Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View view = convertView;
final ViewHolder holder;
if (convertView == null) {
LayoutInflater inflater = ((Activity) context).getLayoutInflater();
view = inflater.inflate(R.layout.c_simple_list_item, parent, false);
holder = new ViewHolder();
holder.txt = (TextView) view.findViewById(R.id.text1);
holder.img = (ImageView) view.findViewById(R.id.imageView1);
holder.rel_main=(RelativeLayout) view.findViewById(R.id.rel_main);
holder.relativeLayout1=(RelativeLayout) view.findViewById(R.id.relativeLayout1);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
String s=DummyContent.ITEMS.get(position).content;
System.out.println("==dummy "+s);
holder.txt.setText(s);
if (s.equalsIgnoreCase("All"))
{
holder.img.setImageResource(R.drawable.all_icon);
}else if (s.equalsIgnoreCase("Note")) {
holder.img.setImageResource(R.drawable.notes_icon);
}else if (s.equalsIgnoreCase("Highlight")) {
holder.img.setImageResource(R.drawable.highlight_icon);
}else if (s.equalsIgnoreCase("Snapshots")) {
holder.img.setImageResource(R.drawable.snapshot_icon);
}else if (s.equalsIgnoreCase("Draw")) {
holder.img.setImageResource(R.drawable.draw_icon);
}else if (s.equalsIgnoreCase("Record Sounde")) {
holder.img.setImageResource(R.drawable.sound_recorder_icon);
}
view.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
mCallbacks.onItemSelected(DummyContent.ITEMS.get(position).id);
if (holder.relativeLayout1.getVisibility()==View.GONE)
{
holder.rel_main.setBackgroundResource(R.drawable.list_item_bg_pressed);
holder.relativeLayout1.setVisibility(View.VISIBLE);
}else {
holder.relativeLayout1.setVisibility(View.GONE);
holder.rel_main.setBackgroundColor(Color.TRANSPARENT);
}
}
});
return view;
}
}
3. And ad Custom Adapter in "onCreate" in ItemListFregment
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// TODO: replace with a real list adapter.
/*setListAdapter(new ArrayAdapter<DummyContent.DummyItem>(getActivity(),
R.layout.c_simple_list_item, R.id.text1, DummyContent.ITEMS));*/
setListAdapter(new CustomAdepeterNewJob(getActivity(), DummyContent.ITEM_MAP));
}

Android: ListView not refreshing on notifyDataSetChanged();

I've got a custom BaseAdapter and an add button in the main activity. The button opens a dialog with a textbox and you can add new elements to the list that way. The problem is that the list is not refreshing. In the onActivityResult() function I print the number of elements in the list and each time I hit OK in the dialog box the number increases, so I know it's just the refreshing that doesn't work. My BaseAdapter and my activity:
class ListaOrase extends BaseAdapter{
private Activity context;
ArrayList<String> orase;
public ListaOrase(Activity context){
this.context=context;
orase=new ArrayList<String>();
}
public void add(String string){
orase.add(string);
this.notifyDataSetChanged();
}
public View getView (int position, View convertView, ViewGroup list) {
View element;
if (convertView == null)
{
LayoutInflater inflater = context.getLayoutInflater();
element = inflater.inflate(R.layout.lista, null);
}
else element = convertView;
TextView elementLista=(TextView)element.findViewById(R.id.elementLista);
elementLista.setText(orase.get(position));
return element;
}
}
public class WeatherAppActivity extends ListActivity {
Button buton;
ListaOrase lista;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
lista=new ListaOrase(this);
buton=(Button)findViewById(R.id.buton);
lista.add("Bucuresti");
lista.add("Sibiu");
setListAdapter(lista);
}
public void add(View view){
Intent intent=new Intent();
intent.setClass(this, Adauga.class);
startActivityForResult(intent, 0);
}
public void onActivityResult (int requestCode, int responseCode, Intent data){
System.out.println("Apelata");
if(responseCode==1){
lista.add(data.getStringExtra("oras")); // e chiar getText()
System.out.println(lista.getCount());
lista.notifyDataSetChanged();
}
}
}
As you can see, I'm trying to refresh (notifyDataSetChanged();) both when adding a new element (in the BaseAdapter extending class) and in method onActivityResult, after the dialog passes the new element to the main Activity. I repeat, the element IS added to the list because the count increases, it just doesn't refresh.
Thanks for your answers!

It's normal that it doesn't refresh, you are adding an item to "lista" but the adapter keeps its own copy of that list, so or you set again the list in the adapter and then you call notifyDataChanged or you add the new item to the adapter.
Anyway I see couple of weird things, I thing you could semplify everything using an array adapter, you don't need to implement add,etc. I wrote some code simplyfing yours:
public class WeatherAppActivity extends ListActivity {
Button buton;
ItemsAdapter lista;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
List<String> initialList = new ArrayList<String>();
initialList.add("Bucuresti");
initialList.add("Sibiu");
lista=new ItemsAdapter(this, initialList);
buton=(Button)findViewById(R.id.button1);
buton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
lista.add(""+System.currentTimeMillis()); // e chiar getText()
lista.notifyDataSetChanged();
}
});
setListAdapter(lista);
}
class ItemsAdapter extends ArrayAdapter<String> {
public ItemsAdapter(Context context, List<String> list) {
super(context, R.layout.lista, list);
}
#Override
public View getView(final int position, View row, final ViewGroup parent) {
final String item = getItem(position);
ItemWrapper wrapper = null;
if (row == null) {
row = getLayoutInflater().inflate(R.layout.lista, parent, false);
wrapper = new ItemWrapper(row);
row.setTag(wrapper);
} else {
wrapper = (ItemWrapper) row.getTag();
}
wrapper.refreshData(item);
return row;
}
class ItemWrapper {
TextView text;
public ItemWrapper(View row) {
text = (TextView) row.findViewById(R.id.elementLista);
}
public void refreshData(String item) {
text.setText(item);
}
}
}
}
These are the xml that I have used:
main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="63dp"
android:text="Button" />
<ListView
android:id="#id/android:list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" >
</ListView>
</RelativeLayout>
lista.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/elementLista"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Medium Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
This is the version of the adapter using a baseadapter:
class ItemsBaseAdapter extends BaseAdapter {
private List<String> items;
private Context mContext;
public ItemsBaseAdapter(Context context, List<String> list) {
items = list;
mContext = context;
}
public void addItem(String str) {
items.add(str);
}
#Override
public View getView(final int position, View row, final ViewGroup parent) {
final String item = (String) getItem(position);
ItemWrapper wrapper = null;
if (row == null) {
row = getLayoutInflater().inflate(R.layout.lista, parent, false);
wrapper = new ItemWrapper(row);
row.setTag(wrapper);
} else {
wrapper = (ItemWrapper) row.getTag();
}
wrapper.refreshData(item);
return row;
}
class ItemWrapper {
TextView text;
public ItemWrapper(View row) {
text = (TextView) row.findViewById(R.id.elementLista);
}
public void refreshData(String item) {
text.setText(item);
}
}
#Override
public int getCount() {
return items.size();
}
#Override
public Object getItem(int position) {
return items.get(position);
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
}
And this is the version of the list item wich also include an imageview on the left:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<ImageView
android:layout_height="wrap_content"
android:src="#android:drawable/btn_star_big_on"
android:scaleType="fitCenter"
android:layout_width="wrap_content"
/>
<TextView
android:id="#+id/elementLista"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Medium Text"
android:textAppearance="?android:attr/textAppearanceMedium"
/>
</LinearLayout>