How can I use the startActivityForResult method in a class that extends View and not extends AppCompatActivity?
public class ContentsElement extends View {
public ContentsElement(final Context context, final String text, final int requestCode, FlexboxLayout cl) {
super(context);
final TextView mu = new TextView(getContext());
mu.setText(text);
cl.addView(mu);
mu.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast toast = Toast.makeText(getContext(),
mu.getText(), Toast.LENGTH_SHORT);
toast.show();
Context context = getContext();
Intent i = new Intent(context, MainActivity.class);
startActivityForResult(i, requestCode);
}
});
}
}
Repalce startActivityForResult(i, requestCode); with:
((Activity)context).startActivityForResult(i, requestCode);
Related
I have a single activity which replaces a fragment containing a recycler view with a fragment containing details of the selected viewholder item. When the back button is pressed the fragment containing the recycler view is restored but the recycler view items are no longer displayed. However, views are restored upon device rotation. All model data is stored in a SQLite database and the adapter list is updated on resume of its fragment .
CrimeListFragment.Java
public class CrimeListFragment extends Fragment {
private Callbacks callbacks;
public interface Callbacks {
public void onItemSelected(UUID id);
}
#Override
public void onAttach(#NonNull Context context) {
super.onAttach(context);
callbacks = (Callbacks) context;
}
#Override
public void onDetach() {
super.onDetach();
callbacks = null;
}
private RecyclerView crimeListRecycler;
private CrimeListAdapter adapter;
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_crime_list, container, false);
crimeListRecycler = view.findViewById(R.id.crime_list);
crimeListRecycler.setLayoutManager(new LinearLayoutManager(getActivity()));
updateUI();
return view;
}
#Override
public void onResume() {
super.onResume();
updateUI();
}
#Override
public void onCreateOptionsMenu(#NonNull Menu menu, #NonNull MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
inflater.inflate(R.menu.fragment_crime_list, menu);
MenuItem showSubtitle = menu.findItem(R.id.show_subtitle);
}
#Override
public boolean onOptionsItemSelected(#NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.new_crime:
Crime crime = new Crime();
CrimeLab.get(getActivity()).addCrime(crime);
/*Intent intent = CrimeActivity.createIntent(getActivity(), crime.getId());
startActivity(intent);*/
callbacks.onItemSelected(crime.getId());
return true;
default:
return onOptionsItemSelected(item);
}
}
private void updateUI() {
List<Crime> crimes = CrimeLab.get(getActivity()).getCrimes();
if (adapter == null) {
adapter = new CrimeListAdapter(crimes);
crimeListRecycler.setAdapter(adapter);
} else {
adapter.setCrimesList(crimes);
adapter.notifyDataSetChanged();
}
}
public class CrimeListAdapter extends RecyclerView.Adapter<CrimeListAdapter.CrimeHolder> {
private List<Crime> crimeList;
public CrimeListAdapter(List<Crime> crimes) {
crimeList = crimes;
}
#NonNull
#Override
public CrimeHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(getActivity()).inflate(R.layout.list_item_crime, parent, false);
return new CrimeHolder(view);
}
#Override
public void onBindViewHolder(#NonNull CrimeHolder holder, int position) {
Crime crime = crimeList.get(position);
holder.bind(crime);
}
#Override
public int getItemCount() {
return crimeList.size();
}
public void setCrimesList(List<Crime> crimes) {
crimeList = crimes;
}
public class CrimeHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private Crime crime;
private TextView crimeTitleTextView;
private TextView crimeDateTextView;
public CrimeHolder(#NonNull View itemView) {
super(itemView);
crimeTitleTextView = itemView.findViewById(R.id.crime_title);
crimeDateTextView = itemView.findViewById(R.id.crime_date);
itemView.setOnClickListener(this);
}
public void bind(Crime crime) {
this.crime = crime;
crimeTitleTextView.setText(crime.getTitle());
crimeDateTextView.setText(crime.getDate().toString());
}
#Override
public void onClick(View v) {
callbacks.onItemSelected(crime.getId());
/*Intent intent = CrimeActivity.createIntent(getActivity(), crime.getId());
startActivity(intent);*/
}
}
}
}
MasterActivity
public class MasterActivity extends AppCompatActivity implements CrimeListFragment.Callbacks {
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fragment);
FragmentManager fm = getSupportFragmentManager();
Fragment fragment = fm.findFragmentById(R.id.fragment_container);
if (fragment == null) {
fragment = new CrimeListFragment();
fm.beginTransaction()
.add(R.id.fragment_container, fragment)
.commit();
}
}
#Override
public void onItemSelected(UUID id) {
Fragment fragment = CrimeFragment.newInstance(id);
FragmentManager fm = getSupportFragmentManager();
fm.beginTransaction()
.replace(R.id.fragment_container, fragment)
.addToBackStack(null)
.commit();
}
}
Please share your code. Something to check when you replace/add your fragment on top of recyclerview fragment.
I have a recyclerview with a textview and the clicked textview gets a background around it.I also have a button within the activity which should put a background to all the items in the recyclerview ie..to show all selected.I am putting my activity and adapter code.please help me
my activity code
set_all_days.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
CommonUtility.selectedDays.clear();
CommonUtility.selectedDays.addAll(daysList);
//loadDays();
}
});
my adapter
public class DaysAdapter<T> extends RecyclerView.Adapter<DaysAdapter.ViewHolder> {
private ArrayList<String> list=new ArrayList<>();
private Context mContext;
private RecyclerViewClickListener mListener;
public DaysAdapter(ArrayList<String> data, Context context, RecyclerViewClickListener listener) {
list = data;
//languageListFiltered = filteredData;
mContext = context;
mListener = listener;
}
#Override
public void onBindViewHolder(DaysAdapter.ViewHolder viewHolder, final int position) {
viewHolder.titleTextView.setText(list.get(position));
// viewHolder.lang_radio.setChecked(position == mSelectedItem);
}
#Override
public int getItemCount() {
return list.size();
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
LayoutInflater inflater = LayoutInflater.from(mContext);
final View view = inflater.inflate(R.layout.days_list_item, viewGroup, false);
return new ViewHolder(view);
}
class ViewHolder extends RecyclerView.ViewHolder {
public TextView titleTextView;
public ViewHolder(final View inflate) {
super(inflate);
titleTextView = (TextView)inflate.findViewById(R.id.text_day);
View.OnClickListener clickListener = new View.OnClickListener() {
#Override
public void onClick(View v) {
if(!CommonUtility.selectedDays.contains(titleTextView.getText().toString()))
{
titleTextView.setBackground(mContext.getResources().getDrawable(R.drawable.green_circle));
titleTextView.setTextColor(mContext.getResources().getColor(R.color.white));
CommonUtility.selectedDays.add(titleTextView.getText().toString());
Log.d("added",titleTextView.getText().toString());
}
else
{
int index=CommonUtility.selectedDays.indexOf(titleTextView.getText().toString());
CommonUtility.selectedDays.remove(index);
titleTextView.setBackground(null);
Log.d("removed",titleTextView.getText().toString());
titleTextView.setTextColor(mContext.getResources().getColor(R.color.black));
}
}
};
itemView.setOnClickListener(clickListener);
titleTextView.setOnClickListener(clickListener);
}
}
}
I'm getting NullPointerException while using setText() inside OnBindViewHolder() while implementing recyclerview. I've debugged the entire code but not getting the solution. Please Explain why the 'holder.articleName' is thrown as null object?
Adapter Class:
public class ArticleListAdapter extends RecyclerView.Adapter<ArticleItemViewHolder> {
String[] articles = {
"article1",
"article2",
"article3",
"article4",
"article5"
};
#NonNull
#Override
public ArticleItemViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_article_list, parent, false);
return new ArticleItemViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ArticleItemViewHolder holder, final int position) {
holder.articleName.setText(articles[position]);
holder.cardView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(ArticleListActivity.this, "Article Clicked", Toast.LENGTH_SHORT).show();
}
});
}
#Override
public int getItemCount() {
return articles.length;
}
}
ViewHolder Class:
import android.support.v7.widget.CardView;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.TextView;
public class ArticleItemViewHolder extends RecyclerView.ViewHolder{
TextView articleName;
CardView cardView;
public ArticleItemViewHolder(View itemView) {
super(itemView);
this.articleName = itemView.findViewById(R.id.articleName);
this.cardView = itemView.findViewById(R.id.cardView);
}
}
Make sure the layout which has the TextView articleName is in the Layout page referenced here R.layout.activity_article_list and not any other layout page!
How to get value from one adapter to another adapter when clicking on the favorite button then it shows how many we clicked on favorite image button and also shows all data in another activity. Below is my Adapter Class & ViewHolder class (i.e AdapterFav.java & ContactViewHolder.java)
AdapterFav.java
public class AdapterFav extends
RecyclerView.Adapter<AdapterFav.ContactViewHolder>{
private ArrayList<Contactfav> contactfavList;
private static Context mContext;
public AdapterFav(ArrayList<Contactfav> contactfavList, Context applicationContext) {
this.contactfavList = contactfavList;
this.mContext = applicationContext;
}
#Override
public ContactViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mContext).inflate(R.layout.contact_row, null);
ContactViewHolder contactViewHolder = new ContactViewHolder(view);
return contactViewHolder;
}
#Override
public void onBindViewHolder(ContactViewHolder holder, int position) {
Contactfav contactfav = (Contactfav) contactfavList.get(position);
holder.tvContactName.setText(contactfav.getContactName());
holder.tvPhoneNumber.setText(contactfav.getContactNumber());
//Log.e("Id is", contactfav.getContactNumber());
holder.ivContactImage.setImageBitmap(contactfav.getContactImage());
holder.id=contactfav.getCid();
}
#Override
public int getItemCount() {
return contactfavList.size();
}
}
ContactViewHolder.java
public static class ContactViewHolder extends RecyclerView.ViewHolder {
ImageView ivContactImage;
ImageButton ibFavBtn;
TextView tvContactName;
TextView tvPhoneNumber;
Contactfav contactfav=new Contactfav();
String id;
public ContactViewHolder(View itemView) {
super(itemView);
ivContactImage = (ImageView) itemView.findViewById(R.id.ivContactImage);
tvContactName = (TextView) itemView.findViewById(R.id.tvContactName);
tvPhoneNumber = (TextView) itemView.findViewById(R.id.tvPhoneNumber);
ibFavBtn = (ImageButton) itemView.findViewById(R.id.fav);
ibFavBtn.setOnClickListener(new View.OnClickListener() {
Boolean b = true;
#Override
public void onClick(View view) {
if (b == true) {
ibFavBtn.setImageResource(R.drawable.star2);
Log.e("From get", id);
b = false;
} else {
ibFavBtn.setImageResource(R.drawable.star);
b = true;
}
}
});
}
}
I am creating a music app and I have listed my songs in RecyclerView. What I want is when I click any song(inside the red marked area), the song should play, just like in modern music players. I don't want any play, stop buttons on my RecyclerView. Any help would be appreciated! Thanks in advance!
Songs.java
public class Songs extends Fragment {
private static final String TAG = "Songs";
RecyclerView recyclerView;
private ArrayList<SongInfoModel> SongList = new ArrayList<SongInfoModel>();
SongAdapter songAdapter;
SongInfoModel s;
private MediaPlayer mediaPlayer;
ScaleInAnimationAdapter alphaAdapter;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.songs_activity, container, false);
recyclerView = (RecyclerView)view.findViewById(R.id.recyclerView);
mediaPlayer = new MediaPlayer();
LinearLayoutManager linearLayoutManager = new
LinearLayoutManager(getContext());
recyclerView.setLayoutManager(linearLayoutManager);
SongInfoModel s= new SongInfoModel("Cheap Thrills","Sia",null, null,
"http://mp3fb.com/wp-includes/inc/down.php?
id=hyCQomZzosfGBvVON0tRV7xfiL2GdtKXbTsBrZh_3NM&t=Sia%2B-
%2BCheap%2BThrils%2B%D0%A0%D0%B5%D0%BC%D0%B8%D0%BA%D1%81.mp3
&hash=true",null,null);
SongList.add(s);
songAdapter = new SongAdapter(getContext(),SongList);
alphaAdapter = new ScaleInAnimationAdapter(songAdapter);
alphaAdapter.setDuration(1000);
alphaAdapter.setInterpolator(new OvershootInterpolator());
alphaAdapter.setFirstOnly(false);
recyclerView.setAdapter(alphaAdapter);
Collections.sort(SongList, new Comparator<SongInfoModel>(){
public int compare(SongInfoModel a, SongInfoModel b){
return a.getSongName().compareTo(b.getSongName());
}
});
return view;
}
SongAdapter.java:
public class SongAdapter extends
RecyclerView.Adapter<SongAdapter.SongHolder>
{
ArrayList<SongInfoModel> SongList = new ArrayList<>();
Context context;
MediaPlayer mediaPlayer;
SongInfoModel obj;
public SongAdapter(Context context, ArrayList<SongInfoModel> SongList) {
this.context = context;
this.SongList = SongList;
}
#Override
public SongAdapter.SongHolder onCreateViewHolder(ViewGroup parent, int
viewType)
{
View view = LayoutInflater.from(context).inflate(R.layout.row_song,
parent, false);
return new SongHolder(view);
}
#Override
public void onBindViewHolder(final SongAdapter.SongHolder holder, final
int
position) {
final SongInfoModel songInfoModel = SongList.get(position);
holder.songName.setText(songInfoModel.SongName);
holder.artistName.setText(songInfoModel.ArtistName);
}
#Override
public int getItemCount() {
return SongList.size();
}
public class SongHolder extends RecyclerView.ViewHolder {
TextView songName;
TextView artistName;
TextView duration;
public SongHolder(View itemView) {
super(itemView);
songName = (TextView)itemView.findViewById(R.id.SongName);
artistName= (TextView)itemView.findViewById(R.id.ArtistName);
duration = itemView.findViewById(R.id.duration);
}
}
}
First, Create an Interface in Adapter class like this -
private CustomOnClickListener customOnClickListener;
public interface CustomOnClickListener{
void onClick(int position);
}
After that Implement View.OnClickListener in View holder class
class TracksViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
public TracksViewHolder(View itemView) {
super(itemView);
itemView.setOnClickListener(this);
}
#Override
public void onClick(View v) {
customOnClickListener.onClick(getAdapterPosition());
}
After that Implement CustomOnClickListener in your Fragment or Activity class.