So I have my main Bottom Navigation Activity, and there is three section one of which is dashboard. And I want to make a grid of categories in there. I've been trying to follow some guides on youtube about creation of GridView, but it seems to not work in this Bottom Navigation Activity. The main issue is that in my custom adapter in method getView it can't resolve R.layout.category_item but the file exists.
I would be grateful for some workaround or explanation of why it happens.
DashboardFragment class:
public class DashboardFragment extends Fragment {
private DashboardViewModel dashboardViewModel;
String[] category_names = {"one","two","three","four","five","six","seven","eight","nine","ten"};
int[] data ={1,2,3,4,5,6,7,8,9,10};
GridView gridView;
public View onCreateView(#NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
dashboardViewModel = ViewModelProviders.of(this).get(DashboardViewModel.class);
View root = inflater.inflate(R.layout.fragment_dashboard, container, false);
dashboardViewModel.getText().observe(getViewLifecycleOwner(), new Observer<String>() {
#Override
public void onChanged(#Nullable String s) {
}
});
gridView = root.findViewById(R.id.category_grid);
CustomAdapter customAdapter = new CustomAdapter();
gridView.setAdapter(customAdapter);
return root;
}
private class CustomAdapter extends BaseAdapter{
#Override
public int getCount() {
return category_names.length;
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View view1 = getLayoutInflater().inflate(R.layout.category_item,null);
return null;
}
}
}
category_item.xml :
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:tools="http://schemas.android.com/tools"
tools:context=".ui.dashboard.DashboardFragment">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
</androidx.constraintlayout.widget.ConstraintLayout>
Hi i don't know if it's the solution of your problem but you don't use any context when you inflate your view
#Override
public View getView(int position, View convertView, ViewGroup parent) {
// inflate the layout for each list row
if (convertView == null) {
convertView = LayoutInflater.from(context).
inflate(R.layout.layout_list_view_row_items, parent, false);
}
...
}
Related
I have a SearchView and a ListView. My goal here is when I search for (for example) Toyota, I got result in the ListView with Toyota, and than when I click on it, Toyota save to another list.
Everything is working well, except the ListView. When I search for something, I get different result. For example if I search for Toyota, I got BMW or Mazda etc. but not Toyota. BUT, if I click on this result Toyota will be saved and not BMW or Mazda despite I click on them.
I think something with the ListView is not good, because in the background evertyhing is working well, but it's shown otherwise.
Here is my xml file:
<SearchView
android:id="#+id/search"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:iconifiedByDefault="false">
<requestFocus />
</SearchView>
<ListView
android:id="#+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />
I am using a custom row in my ListView, I don't think its affect any harm, but now I am even questioning my own existence :D So here it is the list_row.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:padding="15sp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/name"
android:layout_centerVertical="true"
android:layout_marginLeft="28sp"
android:textColor="#73c993"/>
</RelativeLayout>
And the ListViewAdapter.java:
public class ListViewAdapter extends ArrayAdapter<String> {
ArrayList<String> list;
Context context;
public ListViewAdapter(Context context, ArrayList<String> items) {
super(context, R.layout.list_row, items);
this.context = context;
list = items;
}
#NonNull
#Override
public View getView(int position, #Nullable View convertView, #NonNull ViewGroup parent) {
if (convertView == null) {
LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.list_row, null);
TextView name = convertView.findViewById(R.id.name);
name.setText(list.get(position));
}
return convertView;
}
}
Finally, my HomeFragment.java:
public class HomeFragment extends Fragment implements SearchView.OnQueryTextListener {
SearchView editsearch;
static ListView listView;
static ListViewAdapter adapter;
static ArrayList<String> cars, selectedCars;
static Context context;
private HomeViewModel homeViewModel;
public View onCreateView(#NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
homeViewModel = new ViewModelProvider(this).get(HomeViewModel.class);
return inflater.inflate(R.layout.fragment_home, container, false);
}
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
listView = (ListView) view.findViewById(R.id.list);
cars = new ArrayList<>(Arrays.asList("Toyota", "BMW", "Mazda"));
selectedCars= new ArrayList<>();
context = getContext();
adapter = new ListViewAdapter(context, cars);
listView.setAdapter(adapter);
editsearch = (SearchView) view.findViewById(R.id.search);
editsearch.setOnQueryTextListener(this);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String item = adapter.getItem(position);
if (!(selectedCars.contains(item))) {
addItem(item);
makeToast(item + " added.");
} else {
makeToast(item + " already added.");
}
}
});
#Override
public boolean onQueryTextSubmit(String query) {
return false;
}
#Override
public boolean onQueryTextChange(String newText) {
adapter.getFilter().filter(newText);
return false;
}
The button view shows confirming that the fragment shows, however the recycler view doesn't.
The logged array size of "jobs" is 1, confirming that getItemCount() isn't the problem and that the recycler adapter constructor is called. I'm reusing my JobRecyclerAdapter class but nothing's static, so there shouldn't be any interference between the two instances. The layout is a a copy of a working one I have, minus different ids and layout name, so that shouldn't be a problem either. There are no errors.
Layout
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
>
<include layout="#layout/top_bar"
android:id="#+id/topBarAJ"
android:layout_height="wrap_content"
android:layout_width="match_parent"
app:layout_constraintTop_toTopOf="parent"/>
<include layout="#layout/bottom_bar"
android:id="#+id/bottomBarAJ"
android:layout_height="wrap_content"
android:layout_width="match_parent"
app:layout_constraintBottom_toBottomOf="parent"/>
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/activeJobRecyclerView"
app:layout_constraintTop_toBottomOf="#id/topBarAJ"
app:layout_constraintBottom_toTopOf="#id/bottomBarAJ"/>
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
app:layout_constraintBottom_toTopOf="#+id/activeJobRecyclerView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.505"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/topBarAJ" />
</androidx.constraintlayout.widget.ConstraintLayout>
RecyclerAdapter
List<Job> jobs;
List<Drawable> images;
RecyclerViewClickListener clickListener;
public JobRecyclerAdapter(List<Job> downloadedJobs, List<Drawable> images, RecyclerViewClickListener clickListener) {
this.jobs = downloadedJobs;
this.images = images;
Integer arraySize = images.size();
Log.d("downloadActiveJob", "JobRecyclerAdapter: images array size: " + arraySize.toString());
arraySize = jobs.size();
Log.d("downloadActiveJob", "JobRecyclerAdapter: jobs array size: " + arraySize.toString());
this.clickListener = clickListener;
}
class JobCardViewHolder extends RecyclerView.ViewHolder {
public ImageView itemImage;
public TextView itemName;
public TextView itemWeight;
public TextView itemSize;
public TextView transmitterName;
public JobCardViewHolder(View v) {
super(v);//call default constructor
v.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.d("RecyclerView", "onClick：" + getAdapterPosition());
clickListener.recyclerViewListClicked(v, getAdapterPosition());
}
});
itemImage = (ImageView) v.findViewById(R.id.itemImage);
itemName = (TextView) v.findViewById(R.id.itemName);
itemWeight = v.findViewById(R.id.itemWeight);
itemSize = v.findViewById(R.id.itemSize);
transmitterName = v.findViewById(R.id.transmitterName);
}
}
public void removeItem(int jobIndex) {
jobs.remove(jobIndex);
notifyDataSetChanged();
}
#Override
public JobCardViewHolder onCreateViewHolder(ViewGroup vg, int n) {
View v = LayoutInflater.from(vg.getContext()).inflate(R.layout.job_card_layout, vg, false);
JobCardViewHolder vH = new JobCardViewHolder(v);
return vH;
}
#Override
public void onBindViewHolder(JobCardViewHolder vH, int position) {
vH.itemName.setText(jobs.get(position).itemName);
vH.itemImage.setImageDrawable(images.get(position));
vH.itemWeight.setText(jobs.get(position).itemWeight);
vH.itemSize.setText(jobs.get(position).itemSize);
vH.transmitterName.setText(jobs.get(position).transmitterName);
}
#Override
public int getItemCount() {
return jobs.size();
}
}
Fragment (I only showed the relevant parts of the fragment.)
RecyclerView jobRecyclerView;
JobRecyclerAdapter jobRecyclerAdapter;
LinearLayoutManager llm;
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.sub_fragment_active_jobs_1, container, false);
this.jobRecyclerView = view.findViewById(R.id.activeJobRecyclerView);
return view;
}
public void configureJobsRecyclerAdapter(Job activeJob, List<Drawable> imageDrawables) {
Log.d("downloadActiveJob", "configureJobRecyclerAdapter called");
List<Job> downloadedJobs = new ArrayList<>();
downloadedJobs.add(activeJob);
Integer arraySize = imageDrawables.size();
Log.d("downloadActiveJob", "configureJobRecyclerAdapter: " + arraySize.toString());
jobRecyclerAdapter = new JobRecyclerAdapter(downloadedJobs, imageDrawables, this);
llm = new LinearLayoutManager(context);
jobRecyclerView.setLayoutManager(llm);
jobRecyclerView.setAdapter(jobRecyclerAdapter);
}
Update: If I move the recycler view/adapter setup code to onResume, the recycler view is visible. When I update the recycler view with a new adapter, the recycler view becomes invisible.
If I can't solve it using this new discovery I'll post the whole fragment.
Hey, you create the function configureJobsRecyclerAdapter() but didn't call it inside fragment onCreateView(). Like...
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.sub_fragment_active_jobs_1, container, false);
this.jobRecyclerView = view.findViewById(R.id.activeJobRecyclerView);
configureJobsRecyclerAdapter()//Add this line.
return view;
}
if you are fetching data which are required for configureJobsRecyclerAdapter() from an api maybe you are setting empty list at the time when you are calling configureJobsRecyclerAdapter(). and that's why when you call it in onResume, the list becomes visible(because then data is fetched).
and don't forget to call adapter.notifyDataSetChanged() after each change in your list.
Java code
list view layout #1
How can i insert change the graphics of my ListView adding this layout file to my list view? What should i write in my java code for making each row of my ListView just like my layout file. Thank you all guys !!
First of all you need to create the xml for the custom row you want(custom_row.xml):
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="8dp"
android:id="#+id/text" /> </LinearLayout>
Then you need to create your custom adapter:
public class CustomAdapter extends BaseAdapter {
Context context;
List<String> textArray;
LayoutInflater inflater;
public RutinaAdapter(Context context, List<String> textarray) {
this.context = context;
inflater = LayoutInflater.from(context);
this.textArray = textarray;
}
#Override
public int getCount() {
return textArray.size();
}
#Override
public Object getItem(int position) {
return textArray.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewGroup vg;
if (convertView != null) {
vg = (ViewGroup) convertView;
} else {
vg = (ViewGroup) inflater.inflate(R.layout.custom_row, null);
}
String text = textArray.get(position);
final TextView text = ((TextView) vg.findViewById(R.id.text));
return vg;
} }
Then you need to add the adapter to the ListView:
list = (ListView) view.findViewById(R.id.list);
CustomAdapter adapter = new CustomAdapter(getContext(),textArray);
list.setAdapter(adapter1);
Add info to you textArray, and notify the adapter data changed, and thats it.
I have a following Fragment class:
public class TabFragment extends Fragment {
....
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
View view = inflater.inflate(R.layout.fragment_photos_tab, container, false);
TabelAdapter adapt = new TabelAdapter(getActivity().getApplicationContext(), R.layout.list_room_view, flowerList);
setListAdapter(adapt); // Not Working because class is not extended by ListActivity
return view;
}
TabelAdapter class
public class TabelAdapter extends ArrayAdapter<Flower> {
#Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (null == convertView) {
convertView = inflater.inflate(R.layout.list_flower_view, parent, false);
}
Picasso
.with(context)
.load("http://i.imgur.com/rFLNqWI.jpg")
.fit()
.into((ImageView) convertView);
return convertView;
}
list_flower_view.xml
<?xml version="1.0" encoding="utf-8"?>
<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/Flowerimg"
android:layout_width="match_parent"
android:layout_height="200dp"/>
activity_home.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" tools:context=".MainActivity">
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#android:id/list"></ListView>
</RelativeLayout>
When I was working with activity instead of fragment then the whole process was very simple. I extend MainActivity class with ListActivity and add setContentView(R.layout.activity_home); into MainActivity.OnCreate(). I can see the list of Images in ListView.
Question
How to make setListAdapter usable in Fragment class? I am newbie in Android. Any help will be appreciable :)
Edit-1
public class PagerAdapter extends FragmentStatePagerAdapter {
int mNumOfTabs;
public PagerAdapter(FragmentManager fm, int NumOfTabs) {
super(fm);
this.mNumOfTabs = NumOfTabs;
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
TabFragment photo = new TabFragment();
return photo; // Line (30,24)
} ......
}
If I use ListFragment instead of Fragment then PagerAdapter class os throwing an Error.
Error:(30, 24) error: incompatible types: TabFragment cannot be converted to Fragment
Edit-2
java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
Change Fragment to ListFragment:
public class TabFragment extends ListFragment {
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
TabelAdapter adapt = new TabelAdapter(getActivity().getApplicationContext(), R.layout.list_room_view, flowerList);
setListAdapter(adapt);
}
...
}
ListFragment documentation
Tutorial
I have a pagerAdapter like this :
public class AppPagerAdapter extends PagerAdapter {
Context context;
public AppPagerAdapter(Context appcon)
{
this.context = context;
}
#Override
public int getCount() {
return 10;
}
#Override
public Object instantiateItem(ViewGroup container, int position) {
View viewItem = inflater.inflate(R.layout.pager_layout, container, false);
ListView listView = (ListView) viewItem.findViewById(R.id.list);
}
}
And in my XML is this : "pager_layout.xml"
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
xmlns:wheel="http://schemas.android.com/apk/res-auto"
android:layout_height="match_parent">
<ListView
android:layout_width="wrap_content"
android:id="#+id/list"
android:divider="#color/activity_background"
android:layout_height="match_parent">
</ListView>
And, my main fragment page is this :
public class Apps extends Fragment {
public Apps() {}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
mRoot = inflater.inflate(R.layout.app_activity, container, false);
ViewPager pager = (ViewPager)mRoot.findViewById(R.id.view_pager);
AppPagerAdapter appadapter = new AppPagerAdapter(getActivity());
pager.setAdapter(appadapter);
pager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { }
#Override
public void onPageSelected(int position) {
//Access to this position list view for add adapter
new Loading().execute; //async task to get data and add to list view from this pager
}
#Override
public void onPageScrollStateChanged(int state) {}
});
}
}
Now, How can I access this view on screen page for adding data to this page?
I want to add data to listview of page that is selected.
Please help me .
if your viewpager have 4 fragments: A,B,C,D. And you are open fragment A. Then Fragment B and D will be create automatically by Viewpager.
And if you want to add data to listView. Let see this method:
#Override
public Object instantiateItem(ViewGroup container, int position) {
View viewItem = inflater.inflate(R.layout.pager_layout, container, false);
ListView listView = (ListView) viewItem.findViewById(R.id.list);
}
What is
int position?
It is the Page that you selected - Openning.
Your above code will create 10 Page in ViewPager, each Page have the ListView. If you want to add data to this, only write more code in method
instantiateItem()