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Material Container Transform animation not working in Java

Im trying to use Material Container Transform in Recyclerview Adapter as described by this post MaterialContainerTransform transition is not Working on Return , but after implementing this in my project im getting null pointer exception error.
As everyone know Material Container Transform animation tutorials are in kotlin and im doing it in java.
So if anyone know how to properly use material container transform animation in recyclerview and point out my mistakes i will be very much thankful to him.
RecyclerView Adapter Class(source)
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> implements Filterable {
private Context context;
private List<Astadhyayi> wordList;
private List<Astadhyayi> filwordList;
private DictionaryDB dictionaryDB;
private OnclickListenerInterface listener;
public RecyclerViewAdapter(Context context, List<Astadhyayi> itemList, DictionaryDB dictionaryDB) {
this.context = context;
this.wordList = itemList;
this.dictionaryDB = dictionaryDB;
filwordList = new ArrayList<Astadhyayi>(itemList);
}
public void setClickListener(OnclickListenerInterface onclickListener) {
this.listener = onclickListener;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(context);
View view = inflater.inflate(R.layout.wordslist_two_rv, parent, false);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
#Override
public void onBindViewHolder(final ViewHolder holder, int position) {
Astadhyayi word = wordList.get(position);
holder.rsutras.setText(word.mSutras);
// Animation******
holder.rsutras.setTransitionName(word.getMSutras());
if (word.mStatus != null && word.mStatus.equals(DictionaryDB.BOOKMARKED)) {
holder.bookmark.setImageResource(R.drawable.cards_heart);
} else {
holder.bookmark.setImageDrawable(null);
}
}
#Override
public Filter getFilter() {
return Searched_Filter;
}
private Filter Searched_Filter = new Filter() {
#Override
protected FilterResults performFiltering(CharSequence constraint) {
List<Astadhyayi> filteredList = new ArrayList<>();
if (constraint == null || constraint.length() == 0) {
filteredList.addAll(filwordList);
} else {
String filterPattern = constraint.toString().toLowerCase().trim();
for (Astadhyayi item : filwordList) {
if (item.getMSutras().toLowerCase().contains(filterPattern)) {
filteredList.add(item);
}
}
}
FilterResults results = new FilterResults();
results.values = filteredList;
return results;
}
#Override
protected void publishResults(CharSequence constraint, FilterResults results) {
wordList.clear();
wordList.addAll((ArrayList<Astadhyayi>)results.values);
notifyDataSetChanged();
}
};
#Override
public int getItemCount() {
return wordList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private TextView rsutras;
private ImageView bookmark;
public ViewHolder(View itemView) {
super(itemView);
itemView.setOnClickListener(this);
rsutras = itemView.findViewById(R.id.tvSansTerm);
bookmark = itemView.findViewById(R.id.bookmarkBtn);
}
/*
#Override
public void onClick(View view) {
if(listener!=null) listener.onItemClicked(getAbsoluteAdapterPosition(), rsutras);
}
*/
#Override
public void onClick(View view) {
int position = this.getAbsoluteAdapterPosition();
Astadhyayi word = wordList.get(position);
//*************** Bundle **************\\
Bundle bundle = new Bundle();
bundle.putParcelable("allData", word);
bundle.putString("transition_name", word.getMSutras());
Fragment detailsFragment = new TermThreeDetailsFragment();
detailsFragment.setSharedElementEnterTransition(new MaterialContainerTransform());
detailsFragment.setArguments(bundle);
FragmentTransaction fT =((AppCompatActivity)context).getSupportFragmentManager().beginTransaction();
fT.setReorderingAllowed(true);
fT.addSharedElement(rsutras, rsutras.getTransitionName()); // Shared element!
fT.replace(R.id.fragment_container, detailsFragment);
fT.addToBackStack(null);
fT.commit();
}
}
}
RecyclerView Fragment Class(source)
public class ShowtermsTwoFragment extends Fragment {
private RecyclerView rv;
private EditText tV;
private Toolbar toolbar;
private LinearLayoutManager layoutManager;
private static DictionaryDB db;
private RecyclerViewAdapter rvAdapter;
private SearchView searchView = null;
private SearchView.OnQueryTextListener queryTextListener;
private List<Astadhyayi> wordsList = new ArrayList<>();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setExitTransition(new MaterialElevationScale(false));
setReenterTransition(new MaterialElevationScale(true));
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_terms_recyclerview, container, false);
return view;
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
toolbar = ((Toolbar) view.findViewById(R.id.toolbar_rv));
rv = view.findViewById(R.id.rvTerms);
tV = view.findViewById(R.id.tVinput);
//*********** TOOLBAR
AppCompatActivity activity = (AppCompatActivity) getActivity();
activity.setSupportActionBar(toolbar);
setHasOptionsMenu(true);
// new Get_DbData().execute();
databaseCheck();
recyclerCheck1();
postponeEnterTransition();
((ViewGroup) view.getParent()).getViewTreeObserver()
.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
public boolean onPreDraw() {
startPostponedEnterTransition();
return true;
}
});
}
private void databaseCheck() {
String sanskritWord = getActivity().getIntent().getStringExtra("sanskritWord");
//*********** ### DATABASE OPENING ### ***********\\
db = DictionaryDB.getInstance(this.getActivity());
wordsList = db.getWords((sanskritWord));
}
private void recyclerCheck1() {
layoutManager = new LinearLayoutManager(getContext());
rv.setLayoutManager(layoutManager);
rv.setHasFixedSize(true);
DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(rv.getContext(), layoutManager.getOrientation());
rv.addItemDecoration(dividerItemDecoration);
rvAdapter = new RecyclerViewAdapter(getContext(), wordsList, db);
rv.setAdapter(rvAdapter);
/////********** rvAdapter.setClickListener(this);
rvAdapter.notifyDataSetChanged();
}
}
Details Fragment Class(destination)
public class TermThreeDetailsFragment extends Fragment {
private TextView sutraTV,vrittiTV,padaTv,adhyayTV,sutraIdTV ;
private CoordinatorLayout coordinatorLayout;
private FloatingActionButton fabBtn;
private static DictionaryDB db;
private Astadhyayi word;
private BottomAppBar bottomAppBar;
private TextToSpeech pronunciation;
private AudioManager audio;
private String ttsID , trans;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
MaterialContainerTransform transform = new MaterialContainerTransform();
transform.setScrimColor(Color.TRANSPARENT);
setSharedElementEnterTransition(transform);
setSharedElementReturnTransition(transform);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.show_three_details, container, false);
view.findViewById(R.id.tvSutra).setTransitionName(word.getMSutras());
return view;
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
sutraTV = view.findViewById(R.id.tvSutra);
adhyayTV = view.findViewById(R.id.tVAdhyay);
padaTv = view.findViewById(R.id.tVPada);
sutraIdTV = view.findViewById(R.id.tVSutraId);
vrittiTV = view.findViewById(R.id.tvVritti);
fabBtn = view.findViewById(R.id.favFAB);
coordinatorLayout = view.findViewById(R.id.parentCordlayout);
bottomAppBar = view.findViewById(R.id.bottom_app_bar);
bundleCheckWithDb();
WordCheck();
}
private void bundleCheckWithDb() {
//*********** Geting Parcelable Data
word = new Astadhyayi(Parcel.obtain());
Bundle bundle = this.getArguments();
if (bundle != null) {
word = bundle.getParcelable("allData");
trans = bundle.getString("transition_name");
adhyayTV.setText(word.getMAdhyay());
padaTv.setText(word.getMPada());
sutraIdTV.setText(word.getMSutra_id());
sutraTV.setText(word.getMSutras());
vrittiTV.setText(word.getMVritti());
}
//*********** DATABASE OPENING
db = DictionaryDB.getInstance(this.getActivity());
}
private void WordCheck() {
if (word.mStatus != null && word.mStatus.equals(DictionaryDB.BOOKMARKED)) {
fabBtn.setImageResource(R.drawable.cards_heart);
} else {
fabBtn.setImageResource(R.drawable.cards_heart_white);
}
fabBtn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
bookMarkWord(word, fabBtn);
}
});
}
}
Error im getting
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.sanskrit.mysearcher.models.Astadhyayi.getMSutras()' on a null object reference
at com.sanskrit.mysearcher.fragments.TermThreeDetailsFragment.onCreateView(TermThreeDetailsFragment.java:69)

From the current given information, I think you should do something like this:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
word = new Astadhyayi(Parcel.obtain());
Bundle bundle = this.getArguments();
if (bundle != null) {
word = bundle.getParcelable("allData");
}
View view = inflater.inflate(R.layout.show_three_details, container, false);
view.findViewById(R.id.tvSutra).setTransitionName(word.getMSutras());
return view;
}
Again, I am not sure what getMSutras() actually returns and if it's right to use that here.

How to implement a ListView in a Fragment in Android

I have Fragment.java and its XML. In XML I put ListView and I want to update the ListView in Fragment and add some String.
I am trying to make a custom adapter. When I run the ListView in Activity with custom adapter all works great, but when I put the same code in Fragment nothing happens. I am using EventBus3.
This is my Activity send Event
EventBus.getDefault().post(new SendDataHelper(nameOfItem[myItemInt]));
This is my Fragment:
public class MyOrderFragment extends Fragment {
TextView name;
ListView listOrder;
private Context context;
List<cources> collegeList;
public MyOrderFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EventBus.getDefault().register(this);
}
#Subscribe
public void onMessageEvent(SendDataHelper event){
Toast.makeText(getActivity(), event.getText(), Toast.LENGTH_SHORT).show();
String text = event.getText();
name.setText(text);
cources college;
collegeList = new ArrayList<cources>();
college = new cources();
college.name = "sharon";
collegeList.add(college);
listOrder.setVisibility(View.VISIBLE);
ListAdapter adapter = new ListAdapter(collegeList, context);
listOrder.setAdapter(adapter);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.my_order_fragment, container, false);
name = (TextView) rootView.findViewById(R.id.textView);
listOrder = (ListView) rootView.findViewById(R.id.listOrder);
return rootView;
}
}
This is my adapter
public class ListAdapter extends BaseAdapter
{
Context context;
List<cources> valueList;
public ListAdapter(List<cources> listValue, Context context)
{
this.context = context;
this.valueList = listValue;
}
#Override
public int getCount()
{
return this.valueList.size();
}
#Override
public Object getItem(int position)
{
return this.valueList.get(position);
}
#Override
public long getItemId(int position)
{
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent)
{
ViewItem viewItem = null;
if(convertView == null)
{
viewItem = new ViewItem();
LayoutInflater layoutInfiater = (LayoutInflater)this.context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
//LayoutInflater layoutInfiater = LayoutInflater.from(context);
convertView = layoutInfiater.inflate(R.layout.list_adapter_view, null);
viewItem.txtNamePlanche = (TextView)convertView.findViewById(R.id.Tx_name_planche);
viewItem.txtPriceBaget = (TextView)convertView.findViewById(R.id.Tx_price_baget);
viewItem.txtPricePlate = (TextView)convertView.findViewById(R.id.Tx_price_plate);
convertView.setTag(viewItem);
}
else
{
viewItem = (ViewItem) convertView.getTag();
}
viewItem.txtNamePlanche.setText(valueList.get(position).name);
viewItem.txtPriceBaget.setText(valueList.get(position).price_baget);
viewItem.txtPricePlate.setText(valueList.get(position).price_plate);
return convertView;
}
}
This is my ItemView
import android.widget.TextView;
class ViewItem
{
TextView txtNamePlanche;
TextView txtPricePlate;
TextView txtPriceBaget;
}
This is cources:
public class cources
{
public String name;
public String price_plate;
public String price_baget;
}

Change extends Fragment to extends ListFragment

i retrived data from array.xml and when i set in grid view it doesn't comes.i m using custom adapter for that

This is my adapter class.i retrieved data from array.xml and whenever i set in grid view it doesn't comes.i am using custom adapter for that
public class SlokaAdapter extends BaseAdapter
{
private Context context;
private final String[] web;
//private final int[] Imageid;
public SlokaAdapter(Context context, String[] web) {
this.context = context;
this.web = web;
}
public View getView(int position, View convertView, ViewGroup parent) {
View grid;
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
//grid = new View(context);
grid = inflater.inflate(R.layout.custom_slokalist, null);
TextView textView = (TextView) grid.findViewById(R.id.grid_sloka);
} else {
grid = (View) convertView;
}
return grid;
}
#Override
public int getCount() {
return web.length;
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return position;
}
}
and this is my code in program and it throws same problem as above
public class Slokaa extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.shlokalist);
GridView gridView1=(GridView)findViewById(R.id.grid_viewStyle);
final String[] testArray1 = getResources().getStringArray(R.array.Chapter1homelist);
final String[] testArray2=getResources().getStringArray(R.array.Chapter2homelist);
if(chNo.equalsIgnoreCase("chapter 1")){
gridView1.setAdapter( new SlokaAdapter(this, testArray2));
String[] chp_names = getResources().getStringArray(R.array.ChapterName);
String tabname1 = chp_names[1];
txtChapterName.setText(tabname1);
}

How to keep custom listview items when they are out of screen?

I am trying to design a menu like this:
It almost works, however there is a problem. The menu works fine at start, but after scrolling down and up again, the items are gone and downloaded again and it takes a little time. Is there a way to set a number of elements to create at start and keep them from disappearing?
Here is my code:
public class MyActivity extends Activity implements AdapterView.OnItemClickListener {
String headers[];
String image_urls[];
List<MyMenuItem> menuItems;
ListView mylistview;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
menuItems = new ArrayList<MyMenuItem>();
headers = getResources().getStringArray(R.array.header_names);
image_urls = getResources().getStringArray(R.array.image_urls);
for (int i = 0; i < headers.length; i++) {
MyMenuItem item = new MyMenuItem(headers[i], image_urls[i]);
menuItems.add(item);
}
mylistview = (ListView) findViewById(R.id.list);
MenuAdapter adapter = new MenuAdapter(this, menuItems);
mylistview.setAdapter(adapter);
mylistview.setOnItemClickListener(this);
}
}
public class MyMenuItem {
private String item_header;
private String item_image_url;
public MyMenuItem(String item_header, String item_image_url){
this.item_header=item_header;
this.item_image_url=item_image_url;
}
public String getItem_header(){
return item_header;
}
public void setItem_header(String item_header){
this.item_header=item_header;
}
public String getItem_image_url(){
return item_image_url;
}
public void setItem_image_url(String item_image_url){
this.item_image_url=item_image_url;
}
}
public class MenuAdapter extends BaseAdapter{
Context context;
List<MyMenuItem> menuItems;
MenuAdapter(Context context, List<MyMenuItem> menuItems) {
this.context = context;
this.menuItems = menuItems;
}
#Override
public int getCount() {
return menuItems.size();
}
#Override
public Object getItem(int position) {
return menuItems.get(position);
}
#Override
public long getItemId(int position) {
return menuItems.indexOf(getItem(position));
}
private class ViewHolder {
ImageView ivMenu;
TextView tvMenuHeader;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.menu_item, null);
holder = new ViewHolder();
holder.tvMenuHeader = (TextView) convertView.findViewById(R.id.tvMenuHeader);
holder.ivMenu = (ImageView) convertView.findViewById(R.id.ivMenuItem);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
MyMenuItem row_pos = menuItems.get(position);
Picasso.with(context)
.load(row_pos.getItem_image_url())
// .placeholder(R.drawable.empty)
// .error(R.drawable.error)
.into(holder.ivMenu);
holder.tvMenuHeader.setText(row_pos.getItem_header());
Log.e("Test", "headers:" + row_pos.getItem_header());
return convertView;
}
}

Possibly you can implement lazy loading with some sort of caching of images or whatever you are downloading...

You say the images are donwloaded, i assume that the images are coming from internet. Implement a custom cache for http download or download and store the images in one place before you use

why is notifyDataSetChanged() not working in my code?

Why is my code not working? I have already tried using notifyDataSetChanged(), or using invalid() for my listview, or using .setAdapter() again for my adapter, but its still not working please help me.
public class ListDel extends Activity{
ListView mylist_del;
ListViewAdapter listViewAdapter_del;
TypedArray images_del;
ImageView bin_image;
private static String[] names, ages;
storageListImplementation lists = new storageListImplementation();
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.del_layout);
names = lists.getNames();
ages = lists.getAges();
images_del = getResources().obtainTypedArray(R.array.icons);
bin_image = (ImageView)findViewById(R.id.del_image_icon);
listViewAdapter_del = new ListViewAdapter(this);
mylist_del = (ListView)findViewById(R.id.listview_delete);
mylist_del.setAdapter(listViewAdapter_del);
}
private class ListViewAdapter extends BaseAdapter{
private LayoutInflater mInflater;
public ListViewAdapter(Context context){
mInflater = LayoutInflater.from(context);
}
public int getCount() {
return names.length;
}
public Object getItem(int pos) {
return pos;
}
public long getItemId(int position) {
return position;
}
private OnClickListener binClick(ImageView img, final int position, String name) {
return new View.OnClickListener(){
public void onClick(View v) {
lists.del(names[position]);
mylist_del.invalidate();
//mylist_del.setAdapter(listViewAdapter_del);
listViewAdapter_del.notifyDataSetInvalidated();
listViewAdapter_del.notifyDataSetChanged();
//newlistviewadap();
//mylist_del.setAdapter(new ListViewAdapter(this));
//listViewAdapter_del.notifyDataSetChanged();
//String addSuccessful = "You have successfully deleted "+names[position]+" and his/her information in you database";
//Toast.makeText(getApplicationContext(), addSuccessful, Toast.LENGTH_LONG).show();
//ListDel.this.finish();
}
};
}
public void newlistviewadap(){
mylist_del.setAdapter(listViewAdapter_del);
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder textView;
if(convertView==null){
convertView = mInflater.inflate(R.layout.del_listview_row, null);
textView = new ViewHolder();
textView.text = (TextView) convertView.findViewById(R.id.del_values_row);
textView.age = (TextView) convertView.findViewById(R.id.del_age_row);
textView.image = (ImageView) convertView.findViewById(R.id.del_image);
textView.delbutton = (ImageView) convertView.findViewById(R.id.del_image_icon);
convertView.setTag(textView);
}else{
textView = (ViewHolder) convertView.getTag();
}
textView.text.setText(names[position]);
textView.age.setText(ages[position]);
textView.image.setImageDrawable(images_del.getDrawable(position));
textView.delbutton.setOnClickListener(binClick( textView.delbutton, position, names[position]));
return convertView;
}
}
static class ViewHolder{
TextView text;
TextView age;
ImageView image;
ImageView delbutton;
}
}

Try removing
listViewAdapter_del.notifyDataSetInvalidated();
Once you've called it, mylist_del will not retrieve more data from listViewAdapter_del, so only keep the code below and try again:
lists.del(names[position]);
listViewAdapter_del.notifyDataSetChanged();