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How can I create Alert dialog list with different background between row

how can I set background odd and even row in alert dialog like this ?
AlertDialog.Builder builder = new AlertDialog.Builder(MenuRegister.this);
builder.setTitle("Pilih Tipe User");
builder.setItems(arrData, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int position) {
spinerUserType.setText(profesi.get(position).getName());
changeView(profesi.get(position).getId());
role = profesi.get(position).getId();
if (role.equalsIgnoreCase("4")) {
loadSpesialis();
}
}
}).show();

You would have to implement a custom view using builder.setView().
Then, if using a ListView for example, just use something like this:
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = ...;
}
convertView.setBackgroundColor(position % 2 ? Color.GREY : Color.WHITE);
...
}
cf https://stackoverflow.com/a/9697599/603270

You can set your own adapter instead of set items.
AlertDialog.Builder builder = new AlertDialog.Builder(TestActivity.this);
builder.setTitle("Pilih Tipe User");
// Create an ArrayAdapter from List
final ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>
(this, android.R.layout.simple_list_item_1, new String[]{"test1", "test2", "test3"}){
#Override
public View getView(int position, View convertView, ViewGroup parent){
// Get the current item from ListView
View view = super.getView(position,convertView,parent);
if(position %2 == 1)
{
// Set a background color for ListView regular row/item
view.setBackgroundColor(Color.parseColor("#FFB6B546"));
}
else
{
// Set the background color for alternate row/item
view.setBackgroundColor(Color.parseColor("#FFCCCB4C"));
}
return view;
}
};
builder.setAdapter(arrayAdapter, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int position) {
}
}).show();

In getView method
#NonNull
#Override
public View getView(int position, #Nullable View convertView, #NonNull ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.file_list_row, parent, false);
LinearLayout linearLayout = (LinearLayout) view.findViewById(R.id.layout_id);
//set the background color of alternative row
if (position % 2 == 0) {
linearLayout.setBackgroundColor(Color.parseColor("#BDBDBD"));
} else {
linearLayout.setBackgroundColor(Color.parseColor("#EEEEEE"));
}
return view;
}
In Your raw xml file
<?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="wrap_content"
android:orientation="vertical">
<LinearLayout
android:id="#+id/layout_id"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
/* Your Views */
</LinearLayout>
</LinearLayout>

you must use from recyclerView and custom adapter like this :
private void selectCategoryDialog() {
final Dialog dialog = new Dialog(this);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE); // before
dialog.setContentView(R.layout.chips_dialog_layout);
dialog.setCancelable(true);
WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
lp.copyFrom(dialog.getWindow().getAttributes());
lp.width = WindowManager.LayoutParams.MATCH_PARENT;
lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
RecyclerView recyclerView = dialog.findViewById(R.id.recyclerView);
TextView dialogTitle = dialog.findViewById(R.id.dialog_title);
dialogTitle.setText(getResources().getString(R.string.category));
recyclerView.setLayoutManager(new LinearLayoutManager(this));
AdapterCategory _adapter = new AdapterCategory(this, placeCategories);
recyclerView.setAdapter(_adapter);
_adapter.setOnItemClickListener((view, obj, position) -> {
addCategoryChip(obj);
dialog.hide();
});
HelperFunctions.setFont(dialog
.findViewById(android.R.id.content), this, Constants.iranSansFont);
dialog.show();
dialog.getWindow().setAttributes(lp);
}
adapter:
public class AdapterCategory extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private List<PlaceCategory> items = new ArrayList<>();
private OnItemClickListener mOnItemClickListener;
private Typeface mTypeface;
public interface OnItemClickListener {
void onItemClick(View view, PlaceCategory obj, int position);
}
public void setOnItemClickListener(final OnItemClickListener mItemClickListener) {
this.mOnItemClickListener = mItemClickListener;
}
public AdapterCategory(Context context, List<PlaceCategory> items) {
this.items = items;
this.mTypeface = HelperFunctions.getTypeface(context);
}
public class OriginalViewHolder extends RecyclerView.ViewHolder {
public ImageView image;
public TextView title;
public View lyt_parent;
public OriginalViewHolder(View v) {
super(v);
image = v.findViewById(R.id.image);
title = v.findViewById(R.id.type_title);
lyt_parent = v.findViewById(R.id.lyt_parent);
}
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
RecyclerView.ViewHolder vh;
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.chips_item, parent, false);
HelperFunctions.setFontForAdapter((ViewGroup) v, mTypeface);
vh = new OriginalViewHolder(v);
return vh;
}
// Replace the contents of a view (invoked by the layout manager)
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
if (holder instanceof OriginalViewHolder) {
OriginalViewHolder view = (OriginalViewHolder) holder;
PlaceCategory p = items.get(position);
view.title.setText(p.toString());
view.lyt_parent.setOnClickListener(view1 -> {
if (mOnItemClickListener != null) {
mOnItemClickListener.onItemClick(view1, items.get(position), position);
}
});
view.lyt_parent.setBackgroundColor(position % 2 == 0 ? Color.GRAY : Color.WHITE);
}
}
#Override
public int getItemCount() {
return items.size();
}
custom layout for dialog :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/white"
android:orientation="vertical">
<TextView
android:id="#+id/dialog_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:padding="#dimen/spacing_large"
android:text="Contact List"
android:textAppearance="#style/Base.TextAppearance.AppCompat.Title" />
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/spacing_middle"
android:scrollbars="vertical"
android:scrollingCache="true"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</LinearLayout>
i hope helped you

ExpandableListView is blank in fragment

I am new at app developing. I'm currently working on an app with tabview and an ExpandableListView in one of the tabs, thus why i'm trying to use an expandablelistview in a fragment.
My expandablelistview appears flawlessly when run directly from an activity, but when i'm trying to run it from a fragment, it appears blank.
HomeFragment.java
public class HomeFragment extends Fragment {
ExpandableListView expandableListView;
View homeFragmentView;
public HomeFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
homeFragmentView = inflater.inflate(R.layout.fragment_home, container, false);
expandableListView = (ExpandableListView) homeFragmentView.findViewById(R.id.exp_listview);
return homeFragmentView;
}
#Override
public void onViewCreated(View v, Bundle savedInstanceState){
List<String> Headings = new ArrayList<String>();
List<String> L1 = new ArrayList<String>();
List<String> L2 = new ArrayList<String>();
List<String> L3 = new ArrayList<String>();
HashMap<String, List<String>> ChildList = new HashMap<String, List<String>>();
String heading_items[] = getResources().getStringArray(R.array.header_titles);
String h1[] = getResources().getStringArray(R.array.h1_items);
String h2[] = getResources().getStringArray(R.array.h2_items);
String h3[] = getResources().getStringArray(R.array.h3_items);
for(String title : heading_items){
Headings.add(title);
}
for (String title : h1){
L1.add(title);
}
for (String title : h2){
L2.add(title);
}
for (String title : h3){
L3.add(title);
}
ChildList.put(Headings.get(0), L1);
ChildList.put(Headings.get(1), L2);
ChildList.put(Headings.get(2), L3);
ExpListViewAdapter expListViewAdapter = new ExpListViewAdapter(getActivity(), Headings, ChildList);
expandableListView.setAdapter(expListViewAdapter);
}
}
Adapter class:
public class ExpListViewAdapter extends BaseExpandableListAdapter {
private List<String> header_titles;
private HashMap<String, List<String>> child_titles;
private Context ctx;
ExpListViewAdapter(Context ctx, List<String> header_titles, HashMap<String, List<String>> child_titles){
this.ctx = ctx;
this.child_titles = child_titles;
this.header_titles = header_titles;
}
#Override
public int getGroupCount() {
return header_titles.size();
}
#Override
public int getChildrenCount(int groupPosition) {
return child_titles.get(header_titles.get(groupPosition)).size();
}
#Override
public Object getGroup(int groupPosition) {
return header_titles.get(groupPosition);
}
#Override
public Object getChild(int groupPosition, int childPosition) {
return child_titles.get(header_titles.get(groupPosition)).get(childPosition);
}
#Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
#Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
#Override
public boolean hasStableIds() {
return false;
}
#Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
String title = (String)this.getGroup(groupPosition);
if (convertView == null){
LayoutInflater layoutInflater = (LayoutInflater) this.ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.parent_layout, null);
}
TextView textView = (TextView) convertView.findViewById(R.id.heading_item);
textView.setTypeface(null, Typeface.BOLD);
textView.setText(title);
return convertView;
}
#Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
String title = (String)this.getChild(groupPosition,childPosition);
if (convertView == null){
LayoutInflater layoutInflater = (LayoutInflater) this.ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.child_layout, null);
}
TextView textView = (TextView) convertView.findViewById(R.id.child_item);
textView.setText(title);
return convertView;
}
#Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
header (parent) layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#151515">
<TextView
android:id="#+id/heading_item"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Hello World"
android:textColor="#ffffff"
android:textSize="25dp"
android:gravity="center_vertical"
android:layout_marginLeft="10dp"
/>
</LinearLayout>
child layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#252525">
<TextView
android:id="#+id/child_item"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Hello World"
android:textColor="#f9f9f9"
android:gravity="center_vertical"
android:textSize="20dp"
android:layout_marginLeft="10dp"
/>
</LinearLayout>
MainActivity.java
public class MainActivity extends AppCompatActivity {
Toolbar toolbar;
TabLayout tabLayout;
ViewPager viewPager;
ViewPagerAdapter viewPagerAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
overridePendingTransition(R.anim.slide_in, R.anim.slide_out);
toolbar = (Toolbar) findViewById(R.id.toolBar);
setSupportActionBar(toolbar);
tabLayout = (TabLayout) findViewById(R.id.tabLayout);
viewPager = (ViewPager) findViewById(R.id.viewPager);
viewPagerAdapter = new ViewPagerAdapter(getSupportFragmentManager());
viewPagerAdapter.addFragments(new HomeFragment(), "Home");
viewPagerAdapter.addFragments(new Group_Invites(), "Group invites");
viewPagerAdapter.addFragments(new New_Group(), "New group");
viewPager.setAdapter(viewPagerAdapter);
tabLayout.setupWithViewPager(viewPager);
}
}
ViewPagerAdapter.java
public class ViewPagerAdapter extends FragmentPagerAdapter {
ArrayList<Fragment> fragments = new ArrayList<>();
ArrayList<String> tabTitles = new ArrayList<>();
public void addFragments(Fragment fragments, String titles){
this.fragments.add(fragments);
this.tabTitles.add(titles);
}
public ViewPagerAdapter(FragmentManager fm){
super (fm);
}
#Override
public Fragment getItem(int position) {
return fragments.get(position);
}
#Override
public int getCount() {
return fragments.size();
}
#Override
public CharSequence getPageTitle(int position){
return tabTitles.get(position);
}
}

I tried your code and it is working fine. Also share your activity code from where you have opened your fragment class.

ListView does not refresh

I'd like to create a ListView and add items dynamically. Here is my code:
CustomAdapter.java:
public class CustomAdapter extends ArrayAdapter<Item>{
Context context;
int layoutResourceId;
LinearLayout linearMain;
ArrayList<Item> data = new ArrayList<Item>();
public CustomAdapter(Context context, int layoutResourceId,
ArrayList<Item> data) {
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
if (row == null) {
LayoutInflater inflater = ((Activity) context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
linearMain = (LinearLayout) row.findViewById(R.id.lineraMain);
Item myImage = data.get(position);
TextView label = new TextView(context);
label.setText(myImage.name);
linearMain.addView(label);
ImageView image = new ImageView(context);
int outImage = myImage.image;
image.setImageResource(outImage);
linearMain.addView(image);
}
return row;
}
}
Item.java:
public class Item {
int image;
String name;
public Item(int image, String name) {
super();
this.image = image;
this.name = name;
}
public int getImage() {
return image;
}
public void setImage(int image) {
this.image = image;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
GallerF.java
ArrayList<Item> imageArry = new ArrayList<Item>();
CustomAdapter adapter;
ListView dataList;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.activity_gallery, parent, false);
dataList = (ListView) v.findViewById(R.id.lista);
return v;
}
.....
public void CreateNewListRow(){
imageArry.add(new Item(R.drawable.ek_logo,name));
adapter = new CustomAdapter(getActivity(),R.layout.list,imageArry);
dataList.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
list.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/lineraMain"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:padding="10dp" >
</LinearLayout>
activity_gallery.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="hu.redbuttonebb.endi.fragmentek20.GalleryF"
android:background="#drawable/background"
android:id="#+id/linlayout">
<ScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ListView
android:id="#+id/lista"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:drawSelectorOnTop="false" />
</ScrollView>
</LinearLayout>
Now when I run the app it's create one row with the correct picture and name. But when I'd like to create one more then nothing happen. Where do I do it wrong?

Replace your file with this:
ArrayList<Item> imageArry = new ArrayList<Item>();
CustomAdapter adapter;
ListView dataList;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.activity_gallery, parent, false);
dataList = (ListView) v.findViewById(R.id.lista);
adapter = new CustomAdapter(getActivity(),R.layout.list,imageArry);
dataList.setAdapter(adapter);
return v;
}
.....
public void CreateNewListRow(){
imageArry.add(new Item(R.drawable.ek_logo,name));
imageArry.add(new Item(R.drawable.ek_logo,name));
imageArry.add(new Item(R.drawable.ek_logo,name));
imageArry.add(new Item(R.drawable.ek_logo,name));
imageArry.add(new Item(R.drawable.ek_logo,name));
adapter.notifyDataSetChanged();
}
Edit your list.xml with below code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/lineraMain"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="10dp" >
</LinearLayout>
Remove ScrollView, ListView do not require ScrollView:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="hu.redbuttonebb.endi.fragmentek20.GalleryF"
android:background="#drawable/background"
android:id="#+id/linlayout">
<ListView
android:id="#+id/lista"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:drawSelectorOnTop="false" />
</LinearLayout>

Add this method to Adapter & extends Adapter to BaseAdapter
public class FriendsAdapter extends BaseAdapter {
Activity context;
ArrayList<String> data = new ArrayList<>();
LayoutInflater inflater;
public FriendsAdapter(Activity c) {
context = c;
inflater = LayoutInflater.from(this.context);
}
public void add(String item) {
try {
data.add(item);
} catch (Exception e) {
e.printStackTrace();
}
notifyDataSetChanged();
}
public void remove(int position) {
try {
data.remove(data.get(position));
} catch (Exception e) {
e.printStackTrace();
}
notifyDataSetChanged();
}
#Override
public int getCount() {
return data.size();
}
#Override
public String getItem(int position) {
return data.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.list_item_friends, parent, false);
holder = new ViewHolder();
holder.tvUserName = (TextView) convertView.findViewById(R.id.tvUserName);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
try {
holder.tvUserName.setText(data.get(position));
} catch (Exception e) {
e.printStackTrace();
}
return convertView;
}
private class ViewHolder {
TextView tvUserName;
}}
Initializing Adapter
FriendsAdaoter adapter = new FriendsAdapter(this);
list.setAdapter(adapter);
adapter.add("ABCDEFGHIJKL");

You are creating a new Adapter every time you want to add an item. You need to create a method in your adapter and call that method when you add an item, like this:
public class CustomAdapter extends ArrayAdapter<Item>{
Context context;
int layoutResourceId;
LinearLayout linearMain;
ArrayList<Item> data = new ArrayList<Item>();
public CustomAdapter(Context context, int layoutResourceId,
ArrayList<Item> data) {
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
if (row == null) {
LayoutInflater inflater = ((Activity) context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
linearMain = (LinearLayout) row.findViewById(R.id.lineraMain);
Item myImage = data.get(position);
TextView label = new TextView(context);
label.setText(myImage.name);
linearMain.addView(label);
ImageView image = new ImageView(context);
int outImage = myImage.image;
image.setImageResource(outImage);
linearMain.addView(image);
}
return row;
}
public void addItem(Item item) {
data.add(item);
notifyDataSetChanged();
}
and change your CreateNewListRow to this:
public void CreateNewListRow(){
adapter.addItem(new Item(R.drawable.ek_logo,name));
}
and change your onCreate to this:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.activity_gallery, parent, false);
dataList = (ListView) v.findViewById(R.id.lista);
adapter = new CustomAdapter(getActivity(),R.layout.list,imageArry);
dataList.setAdapter(adapter);
return v;
}

Android listview not being populated

I'm trying to populate a listview with the id android.id/list with some xml data.. The data is successfully requested and I get no errors when passing it to my Lazy Adapter and setting it to the listview.. Can somebody help me?
The request:
private void requestFeed() {
SimpleXmlRequest<StationList> simpleRequest = new SimpleXmlRequest<StationList>(Request.Method.GET, url, StationList.class,
new Response.Listener<StationList>()
{
#Override
public void onResponse(StationList response) {
list = response.getStationList();
buildFeed();
if(mSplashDialog != null) {
removeSplashScreen();
} else {
setReloadFeedButtonState(false);
}
}
},
new Response.ErrorListener()
{
#Override
public void onErrorResponse(VolleyError error) {
// error Object
Log.d("TESTE", error.toString());
}
}
);
simpleRequest.setTag(SIMPLE_TAG);
queue = Volley.newRequestQueue(this);
queue.add(simpleRequest);
}
The buildFeed:
private void buildFeed() {
if(stations == null) {
stations = (ListView) findViewById(android.R.id.list);
adapter = new LazyAdapter(this, list);
stations.setAdapter(adapter);
}
adapter.notifyDataSetChanged();
}
The adapter:
public class LazyAdapter extends BaseAdapter {
private List<Station> stations;
private static LayoutInflater inflater = null;
public LazyAdapter(Activity activity, List<Station> stations) {
this.stations = stations;
inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return stations.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
View vi = convertView;
if(convertView == null)
vi = inflater.inflate(R.layout.list_row, null);
TextView name = (TextView) vi.findViewById(R.id.station_name);
TextView ct = (TextView) vi.findViewById(R.id.station_ct);
TextView cl = (TextView) vi.findViewById(R.id.station_cl);
Station tmp = stations.get(position);
name.setText(tmp.get_name());
ct.setText(tmp.get_ct());
cl.setText(tmp.get_lc().toString());
return vi;
}
}
the xml of the activity
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:id="#+id/MainActivityLL"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="me...MainActivity" >
<ListView
android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="0dp"
android:divider="#color/list_divider"
android:dividerHeight="1dp"
android:layout_weight="1"
android:listSelector="#drawable/list_row_selector" />
<TextView
android:id="#android:id/empty"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textAppearance="#android:style/TextAppearance.Medium"
android:text="#string/emptyList"
android:gravity="center" />
I've checked the stations list that comes in the response and is not empty.. I have all the data I need, but the listview is always showing the empty message from the textview with id android.id/empty ..

Remove android:id="#android:id/list"
Replace it with android:id="#+id/list"
<ListView
android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="0dp"
android:divider="#color/list_divider"
android:dividerHeight="1dp"
android:layout_weight="1"
android:listSelector="#drawable/list_row_selector" />

Try to Use ViewHolder design pattern when you make custom adapter :
public class LazyAdapter extends BaseAdapter {
private List<Station> stations;
private Context context;
public LazyAdapter(Context context, List<Station> stations) {
this.stations = stations;
this.context=context;
}
public int getCount() {
return stations.size();
}
public Object getItem(int position) {
return stations.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null){
holder = new ViewHolder();
convertView = LayoutInflater.from(context).inflate(R.layout.list_row, null);
holder.name = (TextView) convertView.findViewById(R.id.station_name);
holder.ct = (TextView) convertView.findViewById(R.id.station_ct);
holder.cl = (TextView) convertView.findViewById(R.id.station_cl);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.name.setText(stations.get(position).get_name());
holder.ct.setText(stations.get(position).get_ct());
holder.cl.setText(stations.get(position).get_lc().toString());
return convertView;
}
class ViewHolder{
TextView name;
TextView ct;
TextView cl;
}
}

How to implement Favorite Button to my BaseAdapter ListView?

I'm learning Android SDK and I need some advices.
I have custom ListView with BaseAdapter and I want to implement some new feature - Favorite Button.
What I want to do is, when I press the Favorite Button, ListItem goes to the beginning of the list, Favorite image change and all that stuff will be saved in the SharedPrefs.
Someone tell me what I need to do, to make it works?
my existing code:
row.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/layout_element_list"
>
<ImageView
android:id="#+id/icon"
android:layout_width="150dp"
android:padding="5dp"
android:layout_height="150dp"
android:layout_marginLeft="4px"
android:layout_marginRight="10px"
android:layout_marginTop="4px"
android:src="#drawable/radio" >
</ImageView>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:id="#+id/label"
android:paddingTop="20dp"
android:layout_gravity="center_vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:textAlignment="center"
android:text="RadioName"
android:textColor="#color/color1"
android:textSize="30dp" />
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1">
<TextView
android:id="#+id/label2"
android:layout_gravity="center_vertical"
android:layout_width="fill_parent"
android:layout_weight="1"
android:layout_height="fill_parent"
android:textAlignment="center"
android:text="Description.."
android:textColor="#color/color1"
android:textSize="15dp" />
<ImageView
android:id="#+id/favButton"
android:layout_weight="1"
android:layout_width="fill_parent"
android:padding="5dp"
android:layout_height="fill_parent"
android:layout_marginLeft="4px"
android:layout_marginRight="10px"
android:layout_marginTop="4px"
android:src="#drawable/fav_off" >
</ImageView>
</LinearLayout>
</LinearLayout>
</LinearLayout>
BaseAdapter class:
public class RadioAdapter extends BaseAdapter
{
ArrayList<RadioStation> myList = new ArrayList<RadioStation>();
LayoutInflater inflater;
Context context;
public RadioAdapter(Context context, ArrayList<RadioStation> myList) {
this.myList = myList;
this.context = context;
inflater = LayoutInflater.from(this.context);
}
#Override
public int getCount() {
return myList.size();
}
#Override
public RadioStation getItem(int position) {
return myList.get(position);
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
MyViewHolder mViewHolder;
if(convertView == null) {
convertView = inflater.inflate(R.layout.activity_menu_row, null);
mViewHolder = new MyViewHolder();
convertView.setTag(mViewHolder);
} else {
mViewHolder = (MyViewHolder) convertView.getTag();
}
mViewHolder.tvTitle = detail(convertView, R.id.label, myList.get(position).getTitle());
mViewHolder.tvDesc = detail(convertView, R.id.label2, myList.get(position).getDescription());
mViewHolder.ivIcon = detail(convertView, R.id.icon, myList.get(position).getImgResId());
return convertView;
}
private TextView detail(View v, int resId, String text) {
TextView tv = (TextView) v.findViewById(resId);
tv.setText(text);
return tv;
}
private ImageView detail(View v, int resId, int icon) {
ImageView iv = (ImageView) v.findViewById(resId);
iv.setImageResource(icon); //
return iv;
}
private class MyViewHolder {
TextView tvTitle, tvDesc;
ImageView ivIcon;
}
}
RadioStation class:
public class RadioStation
{
public String title;
public String description;
public int imgResId;
//getters and setters
public static Comparator<RadioStation> comparatorByRadioName = new Comparator<RadioStation>()
{
#Override
public int compare(RadioStation radioStation, RadioStation radioStation2)
{
String name1 = radioStation.getTitle().toLowerCase();
String name2 = radioStation2.getTitle().toLowerCase();
return name1.compareTo(name2);
}
};
}
ActivityListView:
public class ActivityMenuList extends Activity implements AdapterView.OnItemClickListener
{
private ListView lvDetail;
private Context context = ActivityMenuList.this;
private ArrayList <RadioStation> myList = new ArrayList <RadioStation>();
private String[] names = new String[] { "one", "two", "three" };
private String[] descriptions = new String[] { "notset", "notset", "notset"};
private int[] images = new int[] { R.drawable.one, R.drawable.two, R.drawable.three };
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
getWindow().setBackgroundDrawableResource(R.drawable.bg1);
setContentView(R.layout.activity_menu_list);
lvDetail = (ListView) findViewById(R.id.list);
lvDetail.setOnItemClickListener(this);
getDataInList();
lvDetail.setAdapter(new RadioAdapter(context, myList));
}
private void getDataInList() {
for(int i=0;i<3;i++) {
RadioStation ld = new RadioStation();
ld.setTitle(names[i]);
ld.setDescription(descriptions[i]);
ld.setImgResId(images[i]);
myList.add(ld);
}
Collections.sort(myList, RadioStation.comparatorByRadioName);
}
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l)
{
String item = names[i];
Intent e = new Intent(ActivityMenuList.this, ActivityRadioStation.class);
Bundle data = new Bundle();
data.putString("radiostation",item);
e.putExtras(data);
startActivity(e);
}
}

That's a lot of changes you have to do. Let's start with the basic.
Add a boolean to your RadioStation for the favorite state.
public boolean isFavorite;
Next on your getView add the favorite button click listener(add its reference to the viewholder too, but let's keep it simple this time)
public class RadioAdapter extends BaseAdapter
{
ArrayList<RadioStation> myList = new ArrayList<RadioStation>();
LayoutInflater inflater;
Context context;
ListView mListview;
public RadioAdapter(Context context, ArrayList<RadioStation> myList, ListView list) {
this.myList = myList;
this.context = context;
mListView = list;
inflater = LayoutInflater.from(this.context);
}
#Override
public int getCount() {
return myList.size();
}
#Override
public RadioStation getItem(int position) {
return myList.get(position);
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
MyViewHolder mViewHolder;
if(convertView == null) {
convertView = inflater.inflate(R.layout.activity_menu_row, null);
mViewHolder = new MyViewHolder();
convertView.setTag(mViewHolder);
} else {
mViewHolder = (MyViewHolder) convertView.getTag();
}
mViewHolder.tvTitle = detail(convertView, R.id.label, myList.get(position).getTitle());
mViewHolder.tvDesc = detail(convertView, R.id.label2, myList.get(position).getDescription());
mViewHolder.ivIcon = detail(convertView, R.id.icon, myList.get(position).getImgResId());
convertView.findViewById(R.id.favButton).setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View view)
{
myList.get(position).isFavorite=! myList.get(position).isFavorite;
//reorder mlist
notifyDataSetChanged();
//mListView. smoothscroll here
}
});
((ImageView) convertView.findViewById(R.id.favButton)).setImageResource(myList.get(position).isFavorite?R.drawable.favoriteOn:R.drawable.favoriteOff);
return convertView;
}
private TextView detail(View v, int resId, String text) {
TextView tv = (TextView) v.findViewById(resId);
tv.setText(text);
return tv;
}
private ImageView detail(View v, int resId, int icon) {
ImageView iv = (ImageView) v.findViewById(resId);
iv.setImageResource(icon); //
return iv;
}
private class MyViewHolder {
TextView tvTitle, tvDesc;
ImageView ivIcon;
}
}
I left commented what you should do on the listener. You should be able to continue from here.
When you create your adapter pass the list as the last parameter on the constructor.
Edited: Removed interface. No need to use it here.