We Keep Coding

RecyclerView Adapter return NullPointerException

I want to make double recyclerview to represent rooms on each floor. but NullPointerException occurs in floorAdapter.
public class FloorAdapter extends RecyclerView.Adapter<FloorAdapter.ViewHolder> {
public ArrayList<FloorData> floors;
private Context context;
private LayoutInflater layoutInflater;
public FloorAdapter(ArrayList<FloorData> floors, Context context) {
this.floors = floors;
this.context = context;
this.layoutInflater = LayoutInflater.from(context);
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = layoutInflater.inflate(R.layout.signle_floor, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.recyclerView.setAdapter(new RoomAdapter(context, floors.get(position).rooms));
holder.recyclerView.setLayoutManager(new LinearLayoutManager(context, LinearLayoutManager.HORIZONTAL, false));
holder.recyclerView.setHasFixedSize(true);
holder.tvFloorNum.setText(floors.get(position).floorNum);
}
#Override
public int getItemCount() {
return floors.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
RecyclerView recyclerView;
TextView tvFloorNum;
public ViewHolder(View itemView) {
super(itemView);
recyclerView = (RecyclerView) itemView.findViewById(R.id.rvFloors);
tvFloorNum = (TextView) itemView.findViewById(R.id.tvFloorNum);
}
}
}
public class RoomAdapter extends RecyclerView.Adapter<RoomAdapter.CustomViewHolder> {
private Context context;
private ArrayList<RoomData> rooms;
private LayoutInflater inflater;
public RoomAdapter(Context context, ArrayList<RoomData> rooms) {
this.context = context;
this.rooms = rooms;
this.inflater = LayoutInflater.from(context);
}
#Override
public CustomViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view;
view = inflater.inflate(R.layout.single_room, parent, false);
return new CustomViewHolder(view);
}
#Override
public void onBindViewHolder(CustomViewHolder holder, int position) {
RoomData room = rooms.get(position);
holder.tvRoomNum.setText(room.roomNum);
}
#Override
public int getItemCount() {
return rooms.size();
}
public class CustomViewHolder extends RecyclerView.ViewHolder {
public TextView tvRoomNum;
public CustomViewHolder(View itemView) {
super(itemView);
tvRoomNum = (TextView) itemView.findViewById(R.id.tvRoomNumber);
}
}
}
public class RoomActivity extends AppCompatActivity {
private RecyclerView rvFloor;
private FloorAdapter floorAdapter;
private ArrayList<FloorData> floors;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_room);
floors = prepareData();
rvFloor = findViewById(R.id.rvFloors);
floorAdapter = new FloorAdapter(floors, RoomActivity.this);
LinearLayoutManager manager = new LinearLayoutManager(RoomActivity.this);
rvFloor.setLayoutManager(manager);
rvFloor.setAdapter(floorAdapter);
}
private ArrayList<FloorData> prepareData() {
ArrayList<FloorData> floors = new ArrayList<FloorData>();
//첫번째 subject 추가
FloorData floor1 = new FloorData();
floor1.floorNum = 1;
floor1.rooms = new ArrayList<RoomData>();
RoomData room101 = new RoomData();
room101.roomNum = 101;
RoomData room102 = new RoomData();
room102.roomNum = 102;
RoomData room103 = new RoomData();
room103.roomNum = 103;
floor1.rooms.add(room101);
floor1.rooms.add(room102);
floor1.rooms.add(room103);
floors.add(floor1);
FloorData floor2 = new FloorData();
floor2.floorNum = 2;
floor2.rooms = new ArrayList<RoomData>();
RoomData room201 = new RoomData();
room201.roomNum = 201;
RoomData room202 = new RoomData();
room202.roomNum = 202;
RoomData room203 = new RoomData();
room203.roomNum = 203;
floor2.rooms.add(room201);
floor2.rooms.add(room202);
floor2.rooms.add(room203);
floors.add(floor2);
return floors;
}
}
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".tools.RewardActivity"
android:orientation="vertical">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolBar_room"
android:layout_width="match_parent"
android:layout_gravity="center"
android:layout_height="60dp"
android:background="#color/colorPrimaryDark"
app:title="호실 등록"
android:theme="#style/ToolbarTheme" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rvFloors"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
android:orientation="vertical"
android:background="#FFFFFF"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="15dp">
<TextView
android:id="#+id/tvFloorNum"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:textSize="30dp"
android:textColor="#000000" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rvRooms"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
</LinearLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="2dp">
<TextView
android:id="#+id/tvRoomNumber"
android:layout_width="70dp"
android:layout_height="70dp"
android:layout_marginBottom="5dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="5dp"
android:ellipsize="end"
android:singleLine="true"
android:background="#color/colorPrimary"
/>
</LinearLayout>
</LinearLayout>
Logcat explain
"java.lang.NullPointerException: Attempt to invoke virtual method
'void
androidx.recyclerview.widget.RecyclerView.setAdapter(androidx.recyclerview.widget.RecyclerView$Adapter)'
on a null object reference"
I refer to https://medium.com/#ashishkudale/android-list-inside-list-using-recyclerview-73cff2c4ea95. It's almost the same, but I don't know why the error is happening. please help me

two things.
First, in your FloorAdapter's ViewHolder's constructor, you are finding recycler view of activity instead of that of Adapter. Change your code to,
public ViewHolder(View itemView) {
super(itemView);
recyclerView = (RecyclerView) itemView.findViewById(R.id.rvRooms); //**This is rvFloors in your code**
tvFloorNum = (TextView) itemView.findViewById(R.id.tvFloorNum);
}
in FloorAdapter. This will resolve your crash.
But you will experience two more crashes here
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.recyclerView.setAdapter(new RoomAdapter(context, floors.get(position).rooms));
holder.recyclerView.setLayoutManager(new LinearLayoutManager(context, LinearLayoutManager.HORIZONTAL, false));
holder.recyclerView.setHasFixedSize(true);
holder.tvFloorNum.setText(floors.get(position).floorNum); // **Crash will be on this line**
}
and
#Override
public void onBindViewHolder(CustomViewHolder holder, int position) {
RoomData room = rooms.get(position);
holder.tvRoomNum.setText(room.roomNum);//**Crash will be on this line**
}
These will happen because setText method takes String as argument but you are passing either Integer or int.
So change both these lines to
holder.tvFloorNum.setText(String.valueOf(floors.get(position).floorNum));
holder.tvRoomNum.setText(String.valueOf(room.roomNum));
Hope this answer helps.

How to reference a view inside an element from my ListView?

So I have created a custom adapter for my ListView with three Views - TextView, ImageView and a basic View:
<?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:id="#+id/AllNotesFragment">
<TextView
android:id="#+id/addNoteTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginStart="30dp"
android:layout_marginTop="25dp"
android:textSize="18sp"
android:gravity="center"
android:fontFamily="#font/ukij_qolyazma"
android:text="+new"
/>
<ImageButton
android:id="#+id/deleteNoteImageButton"
android:layout_width="50dp"
android:layout_height="70dp"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true"
android:layout_marginTop="0dp"
android:layout_marginEnd="30dp"
android:textSize="24sp"
android:gravity="center"
android:scaleType="fitXY"
android:adjustViewBounds="true"
android:fontFamily="#font/ukij_qolyazma"
/>
<View
android:id="#+id/underlineView"
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true"
android:layout_marginHorizontal="30dp"
android:layout_marginTop="70dp"
android:background="#color/colorMainDark" />
<ListView
android:id="#+id/notesListView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentBottom="true"
android:layout_marginTop="75dp"
android:layout_marginBottom="0dp">
</ListView>
I have created and instantiated the ListView
notesListView = view.findViewById(R.id.notesListView);
And filled it with a bunch of my notes
notes = (ArrayList<Note>) db.getAllNotesForDay(NotesForDayActivity.getRememberDay(),
NotesForDayActivity.getRememberMonth(),
NotesForDayActivity.getRememberYear());
for (Note note : notes) {
noteTitles.add(note.getTitle());
}
NotesListAdapter adapter = new NotesListAdapter(((NotesForDayActivity) getActivity()).getContext(), notes);
notesListView.setAdapter(adapter);
With my custom adapter:
public class NotesListAdapter extends BaseAdapter {
private static final String TAG = "NotesListAdapter";
public static Context context;
private RelativeLayout notesListRelativeLayout;
private TextView noteTitleTextView;
private ImageView tickImage;
private View underlineView;
private List<Note> notes;
// !
private View listItemsView;
public NotesListAdapter(Context context, List<Note> notes) {
this.notes = notes;
this.context = context;
}
#Override
public int getCount() {
return NotesForDayActivity.getCountNotes();
}
#Override
public Object getItem(int position) {
return notes.get(position);
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
listItemsView = convertView;
if (listItemsView == null) {
listItemsView = LayoutInflater.from(NotesForDayActivity.context).inflate(R.layout.notes_list_layout, null);
}
underlineView = listItemsView.findViewById(R.id.underlineView);
notesListRelativeLayout = (RelativeLayout) listItemsView.findViewById(R.id.notesListRelativeLayout);
noteTitleTextView = (TextView) listItemsView.findViewById(R.id.noteTitleTextView);
tickImage = (ImageView) listItemsView.findViewById(R.id.tickImageView);
noteTitleTextView.setText(notes.get(position).getTitle());
return listItemsView;
}
I can access an item inside my ListView with a OnItemClickListener, but I do not know how to access a View inside that particular Item of my ListView.
So If I set my OnClick like this:
notesListView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
});
How can I reference one of the three Views in that item. For example I need to set the visibility of my imageview:
Any help is appreciated.

Try this, OnItemClickListener will return the view, so that you can get access through that view
notesListView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
ImageView tickImage = view.findViewById(R.id. tickImageView);
if(tickImage!=null){
tickImage.setVisibility(View.GONE);
}
}
});

How to get drawable of an ImageView from a custom spinner?

I have a custom spinner with an ImageView and a TextView, however the return codes do not return either one of these values rather they return it as an object.
How do I get the drawable id or the textview string separately and not the object of the spinner?
Do I have to do it in my adapter, the spinner itself or other components trying to get the data?
Tq
Here is my Spinner XML code :
<?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="horizontal">
<ImageView
android:id="#+id/spinnerImage"
android:layout_width="40dp"
android:layout_height="40dp"
android:padding="5dp"
android:layout_weight="1"
android:src="#drawable/dark_red_square" /><!--Make sure image is present in Drawable folder-->
<TextView
android:id="#+id/spinnerText"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:layout_weight="2"
android:textSize="14sp"
android:gravity="center"
android:text="Demo"
android:textColor="#000" />
</LinearLayout>
This spinner is in a fragment. Honestly I don't know what codes should I sample here for reference, but here's the custom adapter
public class CustomAdapter extends BaseAdapter {
Context context;
int flags[];
String[] countryNames;
LayoutInflater inflter;
public CustomAdapter(Context context, int[] flags, String[] countryNames, LayoutInflater inflter) {
this.context = context;
this.flags = flags;
this.countryNames = countryNames;
this.inflter = (LayoutInflater.from(context));
}
#Override
public int getCount() {
return flags.length;
}
#Override
public Object getItem(int position) {
return countryNames[position];
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
convertView = inflter.inflate(R.layout.spinner_item, null);
TextView spinnerText= convertView.findViewById(R.id.spinnerText);
ImageView spinnerImage = convertView.findViewById(R.id.spinnerImage);
spinnerText.setText(countryNames[position]);
spinnerImage.setImageResource(flags[position]);
return convertView;
}
}

Multiple TextView in RecycleView. how to do that?

Hello I just started the Android and I do not understand how to put more TextView in a RecyclerView
I have already seen this solution but I do not understand: How to create RecyclerView with multiple view type?
I tried to make a table with multiple dimensions but it did not work.
Adapter:
public class DeviceRecyclerView extends RecyclerView.Adapter<DeviceRecyclerView.ViewHolder> {
private String[]data;
public DeviceRecyclerView(String[]data){
this.data = data;
}
#Override
public DeviceRecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View view = inflater.inflate(R.layout.device_list_row, parent , false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
String name = data[position];
String rssi = data[position];
String uuid = data[position];
holder.DeviceNameTextView.setText(name);
holder.DeviceUUIDTextViewValue.setText(rssi);
holder.DeviceRSSIVTextViewValue.setText(uuid);
}
#Override
public int getItemCount() {
return data.length;
}
public class ViewHolder extends RecyclerView.ViewHolder{
TextView DeviceNameTextView;
TextView DeviceUUIDTextViewValue;
TextView DeviceRSSIVTextViewValue;
public ViewHolder (View itemView){
super(itemView);
DeviceNameTextView = itemView.findViewById(R.id.DeviceNameTextView);
DeviceUUIDTextViewValue = itemView.findViewById(R.id.DeviceUUIDTextViewValue);
DeviceRSSIVTextViewValue = itemView.findViewById(R.id.DeviceRSSIVTextViewValue);
}
}
MainActivity:
RecyclerView deviceList = (RecyclerView)findViewById(R.id.recycler_view_NoPaired);
deviceList.setLayoutManager(new LinearLayoutManager(this));
String[]names = {"Samsung64656"};
String[]rssi = {"ezez"};
String[]uuid = {"08:90:e5:90"};
deviceList.setAdapter(new DeviceRecyclerView(names));
My XML.
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/frameLayout"
android:layout_width="match_parent"
android:layout_height="180dp"
android:gravity="center_vertical"
tools:layout_editor_absoluteX="30dp"
tools:layout_editor_absoluteY="81dp">
<View
android:id="#+id/ColoredRect"
android:layout_width="10dp"
android:layout_height="160dp"
android:layout_marginBottom="16dp"
android:layout_marginTop="16dp"
android:background="#E27F26"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/DeviceNameTextView"
android:layout_width="133dp"
android:layout_height="24dp"
android:layout_marginStart="20dp"
android:layout_marginTop="16dp"
android:text="#string/device_name_label"
android:textColor="#color/TextColor"
android:textSize="18sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/DeviceUUIDTv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginTop="8dp"
android:text="#string/deviceUUIDTextView"
android:textColor="#color/TextColor"
android:textSize="12sp"
app:layout_constraintBottom_toTopOf="#+id/DeviceUUIDTextViewValue"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/DeviceNameTextView" />
<TextView
android:id="#+id/DeviceUUIDTextViewValue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginTop="14sp"
android:text=""
android:textColor="#color/TextColor"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/DeviceUUIDTv" />
<TextView
android:id="#+id/rssiLabelTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginTop="16dp"
android:text="#string/deviceRSSITextView"
android:textColor="#color/TextColor"
android:textSize="12sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/DeviceUUIDTextViewValue" />
<TextView
android:id="#+id/DeviceRSSIVTextViewValue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginTop="14sp"
android:text=""
android:textColor="#color/TextColor"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/rssiLabelTextView" />
</android.support.constraint.ConstraintLayout>
Please explain me clearly how to do it. I am French sorry for spelling errors.

You just need to add some textView in you'r XML row (named device_list_row.xml), and init their in your adapter, like you have already did with 3 textview.
But's more easy with Object than use array of string, for data. for example in you'r case , make Device class object
Device.java
public class Device {
String name;
String rssi;
String uuid;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getRssi() {
return rssi;
}
public void setRssi(String rssi) {
this.rssi = rssi;
}
public String getUuid() {
return uuid;
}
public void setUuid(String uuid) {
this.uuid = uuid;
}
}
And adapter code ->
public class DeviceRecyclerView extends RecyclerView.Adapter<DeviceRecyclerView.ViewHolder> {
private ArrayList<Device> deviceList;
public DeviceRecyclerView(Arraylist<Device> deviceList){
this.deviceList= deviceList;
}
#Override
public DeviceRecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View view = inflater.inflate(R.layout.device_list_row, parent , false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
Device device = deviceList.get(position);
holder.deviceNameTextView.setText(device.getName());
holder.deviceUUIDTextViewValue.setText(device.getUuid());
holder.deviceRSSIVTextViewValue.setText(device.getRssi());
}
#Override
public int getItemCount() {
return deviceList.length;
}
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
TextView deviceNameTextView, deviceUUIDTextViewValue, deviceRSSIVTextViewValue;
public ViewHolder(View itemView) {
super(itemView);
itemView.setOnClickListener(this);
deviceNameTextView = itemView.findViewById(R.id.DeviceNameTextView);
deviceUUIDTextViewValue = itemView.findViewById(R.id.DeviceUUIDTextViewValue);
deviceRSSIVTextViewValue = itemView.findViewById(R.id.DeviceRSSIVTextViewValue);
}
#Override
public void onClick(View v) {
Log.i("DEBUG","Item RecyclerView Cliqué");
}
}
With that, you init your Adapter with list of Device Object, who can have any variable has you want without need to pass more array or data to Adapter:-)
And for make a new Device, and use it in RV
Device device = new Device();
device.setName("Device Name 01");
device.setUuid("uuid value");
device.SetRssi("rssi value");
ArrayList<Device> deviceList = new ArrayList<>();
deviceList.add(device);
//Init adapter and fill it
DeviceRecyclerView deviceRecyclerView = new DeviceRecyclerView(deviceList);
LinearLayoutManager llm = new LinearLayoutManager(getContext());
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(llm);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(deviceRecyclerView);

How to make card style menu in android

I want to add card style in my app like this
i use in my app mysql database so i need to make like this cards and put my data from database in it now i use ListView with this code
public void listAllItme() {
ListAdapter lA = new listAdapter(listitems);
listView.setAdapter(lA);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent open = new Intent(R_arabic.this, rewaya_show.class);
open.putExtra("name", listitems.get(position).name);
open.putExtra("url", listitems.get(position).url);
open.putExtra("img", listitems.get(position).img);
open.putExtra("num", listitems.get(position).num);
startActivity(open);
}
}
});
}
class listAdapter extends BaseAdapter {
ArrayList<listitem_gib> lista = new ArrayList<listitem_gib>();
public listAdapter(ArrayList<listitem_gib> lista) {
this.lista = lista;
}
#Override
public int getCount() {
return lista.size();
}
#Override
public Object getItem(int position) {
return lista.get(position).name;
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
LayoutInflater layoutInflater = getLayoutInflater();
View view = layoutInflater.inflate(R.layout.row_item_gib, null);
TextView name = (TextView) view.findViewById(R.id.textView_gib);
ImageView img = (ImageView) view.findViewById(R.id.imageView_gib);
TextView num = (TextView) view.findViewById(R.id.textView_gib2);
TextView size = (TextView) view.findViewById(R.id.textView_gib3);
name.setText(lista.get(position).name);
num.setText(lista.get(position).num);
size.setText(lista.get(position).size);
Picasso.with(R_arabic.this).load("http://grassyhat.com/android/image/" + lista.get(position).img).into(img);
return view;
}
}
first i want to know how i can make like this card style
second how i can use this code with card menu not listview
sorry im new in android and sorry for my bad english

What do you mean by card menu? because the example in the image is a recyclerview with a cardview item, you can achieve this by doing something like this
This will be your activity
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = (RecyclerView)findViewById(R.id.recyclerView);
//Just your list of objects, in your case the list that comes from the db
List<Items> itemsList = new ArrayList<>();
CardAdapter adapter = new CardAdapter(this, itemsList);
//RecyclerView needs a layout manager in order to display data so here we create one
StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL);
//Here we set the layout manager and the adapter to the listview
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(adapter);
}
Inside the layout file you just have to place the recyclerview like this
<RelativeLayout
android:id="#+id/activity_main"
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"
tools:context="jsondh.myapplication.MainActivity">
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>
Then your adapter will be something like this
public class CardAdapter extends RecyclerView.Adapter<CardAdapter.CardViewHolder> {
private List<Items> itemsList;
private Activity activity;
public CardAdapter(Activity activity, List<Items> items){
this.activity = activity;
this.itemsList = items;
}
#Override
public CardViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = activity.getLayoutInflater().inflate(R.layout.cardview_layout, parent, false);
return new CardViewHolder(itemView);
}
#Override
public void onBindViewHolder(CardViewHolder holder, int position) {
//Here you bind your views with the data from each object from the list
}
#Override
public int getItemCount() {
return itemsList.size();
}
public class CardViewHolder extends RecyclerView.ViewHolder {
public ImageView bookImage;
public TextView bookLabel01, bookLabel02;
public CardViewHolder(View itemView) {
super(itemView);
bookImage = (ImageView)itemView.findViewById(R.id.image);
bookLabel01 = (TextView)itemView.findViewById(R.id.label01);
bookLabel02 = (TextView)itemView.findViewById(R.id.label02);
}
}
And the last one will be the layout from each item on the list, like this
<RelativeLayout
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:layout_margin="10dp">
<android.support.v7.widget.CardView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:cardElevation="15dp"
app:cardBackgroundColor="#3369Ed">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:id="#+id/image"
android:layout_width="150dp"
android:layout_height="130dp"/>
<TextView
android:id="#+id/label01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Label"
android:layout_gravity="right"
android:padding="5dp"
android:textColor="#ffffff"/>
<TextView
android:id="#+id/label02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="LongerLabel"
android:layout_gravity="right"
android:padding="5dp"
android:textColor="#ffffff"/>
</LinearLayout>
</android.support.v7.widget.CardView>
You also have to add this to your gradle file:
compile 'com.android.support:recyclerview-v7:25.0.0'
compile 'com.android.support:cardview-v7:25.0.0'
Hope it helps!

It's pretty simple. You will have to use a RecyclerView with GridLayoutManager and add a cardView to it.
Then, use an Adapter and ViewHolder to feed the data.
I suggest you to check this out:
https://developer.android.com/training/material/lists-cards.html