updating recycler view items from a different activity

See also questions close to this topic

• Android Build Variant Signing Config

  I have the following in my android app module build.gradle file.

  android {
  
      defaultConfig {
          ...
      }
  
      signingConfigs {
          if (System.getEnv()['CIRCLE-CI']) { /* CI System */
              localMachine { /* CI System KeyStore file and properties. */
                  ...
                  keyAlias = "ABC"
              }
              playStore { /* CI System KeyStore file and properties. */
                  ...
                  keyAlias = "ABC"
              }
          } else { /* Local machine, not CI System. */
              localMachine { /* debug.keystore local file and properties. */
                  ...
                  keyAlias = "androiddebugkey"
              }
              playStore { /* debug.keystore local file and properties. */
                  ...
                  keyAlias = "androiddebugkey"
              }
          }
      }
  
      productFlavors {
          productOne {
              ...
          }
          productTwo {
              ...
          }
      }
  
      buildTypes {
          debug {
              ...
          }
          release {
              ...
          }
      }
  }
  
  /** This is where the problem is **/
  android.applicationVariants.all { variant -> 
          if (variant.mergedFlavor.name == "productOne") {
              if (variant.buildType.name == "debug") {
                  variant.signingConfig android.signingConfigs.localMachine
              } else if (variant.buildType.name == "release") {
                  variant.signingConfig android.signingConfigs.playStore
              }
          } else if (variant.mergedFlavor.name == "productTwo") {
              if (variant.buildType.name == "debug") {
                  variant.signingConfig android.signingConfigs.localMachine
              } else if (variant.buildType.name == "release") {
                  variant.signingConfig null
              }
          }
      }
  }
  

  Expected output is as follows.

  productOneDebug -> Sign with signingConfigs.localMachine
  productTwoDebug -> Sign with signingConfigs.localMachine
  productOneRelease -> Sign with signingConfigs.playStore
  productTwoRelease -> Unsigned.
  

  Actual output is as follows.

  productOneDebug -> Signed with signingConfigs.localMachine
  productTwoDebug -> Signed with signingConfigs.localMachine
  productOneRelease -> Unsigned.
  productTwoRelease -> Unsigned.
  

  Why are Release apks always unsigned? The intention is to only have ProductTwo Release apk unsigned, but ProductOne Release apk should be signed based on the given configuration.
• Xamarin firebase (fcm) push data message to trigger a download

  My experience with Xamarin and Android is limited, but I have used this example https://docs.microsoft.com/en-us/xamarin/android/data-cloud/google-messaging/remote-notifications-with-fcm?tabs=vswin to handle push-messages.

  When a data-message is sent to the app the OnMessageReceived() is always called, and it works fine when application is in the forground and in the background.

  I have used the CrossDownloadManager ( https://github.com/SimonSimCity/Xamarin-CrossDownloadManager ) to init an download in the OnMessageReceived(), and it starts to download without problems.

  But now the trouble starts, if I swipe the app from the recent list it does not receive any more push-messages. Is this was suppose to happen?

  On earlier version of Android it has been stated that WakefulBroadcastReceiver() could ensure that push-messages are getting through, but in O it is "voided".

  After reading this https://medium.com/til-kotlin/jobintentservice-for-background-processing-on-android-o-39535460e060 I could not figure out how JobScheduler can replace my needs.

  Any tips on how to always get a push message to your app in O? It does not need to be delivered "on time", it just have to be processed. My goal is to make and simple external triggered downloader app...
• Android: Restrict a user from swiping screens in ViewPager

  I have a Tabbed Activity: a user can swipe to the right or to the left to change the screens. At some point I want to record an audio and while it is being recorder the user is not supposed to change the screens.

  Question: How to restrict a user from changing screens (swiping) in ViewPager?

  I tried to figure out how to do that using ViewPager API but I didn't manage to find a proper way (there are hundreds or may be even thousand methods in ViewPager none of which is likely to do what I want).
• Discord.Net Insert Data From String To A Database Table C#

  So i want to insert values to database table with discord bot. The problem is that it doesnt work. I double checked the server of the database, user, password, their all good but something is just wrong. Im trying to figure what is wrong. Heres my code:

      [Command("Register"), Alias("register")]
      public async Task Main(string User)
      {
       if (Insert(User))
          {
           await Context.Channel.SendMessageAsync($"User {User} Has Been Registered Sucesfully!");
          }
          else
          {
           await Context.Channel.SendMessageAsync($"User {User} Has Not Been Registered Sucesfully!");
          }
      }
  

  public bool Insert(string U) { string ConnString;

          ConnString = $"SERVER={Server};DATABASE={Database};UID={UID};PASSWORD={Password};";
  
          Conn = new MySqlConnection(ConnString);
  
          string Query = $"INSERT INTO users (id,username) VALUES ('','{U}');";
  
          try
          {
              if (OpenConnection())
              {
                  MySqlCommand Cmd = new MySqlCommand(Query, Conn);
  
                  try
                  {
                      Cmd.ExecuteNonQuery();
                      return true;
                  }
                  catch (Exception Ex)
                  {
                      return false;
                  }
  
              }
              else
              {
                  Conn.Close();
                  return false;
              }
          }
          catch (Exception Ex)
          {
              Conn.Close();
              return false;
          }
      }
  
      public bool OpenConnection()
      {
          try
          {
              Conn.Open();
              return true;
          }
          catch (MySqlException Ex)
          {
              switch (Ex.Number)
              {
                  case 0:
                      Console.WriteLine("Connection To The Server Failed!\nPlease Try Again Later.");
                      break;
                  case 1045:
                      Console.WriteLine("Server Username or Password Are Incorrect!\nPlease Try Again Later.");
                      break;
              }
              return false;
          }
      }
  
• MySQL - merge column value for rows with the same key with the same key

  Heres a description screen shot of the keys in a table that I use: Table keys

  Each row in the table is a representation of purchases by a specific client in a specific hour. So a typical row would be like: typical row (screenshot)

  I need to merge two clients data, so one client will have all the purchases values summed up in his rows, for each hour.

  In pseudo code what i want to perform is:

  For every hour (row), Add the 'purchase amount' of the rows that have client id of '526' to all rows that have client id '518'

  .

  At first, I tried to execute this but then got an error due to the multiple keys configured in the table:

  UPDATE purchases set client id = 518 where client id = 526;
  

  since the client '518' already has rows for the same hours, I can not perform the above query that creates new rows.

  How should I tackle this?
• join table referencing non unique foreign key

  I have the following tables in a database. phrases allows duplicate phrases to be stored.

  CREATE TABLE phrases (
      id INTEGER PRIMARY KEY,
      phrase VARCHAR(1000),
      creation_date TIMESTAMP WITH TIME ZONE NOT NULL,
  );
  
  CREATE TABLE intents (
      id INTEGER PRIMARY KEY,
      name VARCHAR(10) UNIQUE
  );
  

  I would like to create a join table between phrases and intents. I want to enforce that:

  • each phrase exists in the phrases table
  • each phrase only appears once

  The following fails because the foreign key in phrases is not unique.

  CREATE TABLE phrases_intents (
      phrase VARCHAR(1000) REFERENCES phrases (phrase),
      intent VARCHAR(10) REFERENCES intents (name),
      PRIMARY KEY (phrase),
  );
  

  What is best practice to allow this functionality?
• Submit Checked Status of Recyclerview Items In JSON Object Android

  I have a list of items in recyclerview which has a checkbox for each row. I have successfully gotten the checked items and their values from adapter and send them to activity using a hashmap like below:

  private HashMap<String, String> attendanceMap;
  
  viewholder.attendanceCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
          @Override
          public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
              if (b){
                  playerSession.setPresent(b);
                  attendanceMap.put(itemsList.get(position).getUserId_player(), "1");
                  sendToActivity();
              }
          }
      });
  
      for (Map.Entry<String, String> viewer : attendanceMap.entrySet()) {
          Log.d(TAG, "Players in map:\t" + viewer.getKey() + " \t and status in map:\t" + viewer.getValue());
      }
  
  public HashMap<String, String> sendToActivity() {
      return attendanceMap;
  }
  

  and in activity I have gotten the values like below:

  HashMap<String, String> map = adapter.sendToActivity();
  

  I want to submit the player_id and att_status gotten from adapter in the activity by using json object in my post method. I have tried retrieving all the values by looping through them and adding them to json object like below:

  JSONObject jsonObject = new JSONObject();
      try {
          jsonObject.put("prg_user_map_id", progUserMapId);
          jsonObject.put("prg_session_id", progSessId);
          jsonObject.put("batch_id", batchId);
          jsonObject.put("coach_id", coachId);
      } catch (JSONException e) {
          e.printStackTrace();
      }
      for (Map.Entry<String, String> viewer : map.entrySet()) {
          Log.d(TAG, "Players in map:\t" + viewer.getKey() + " \t and status in map:\t" + viewer.getValue());
          try {
              jsonObject.put("player_id", viewer.getKey());
              jsonObject.put("att_status", viewer.getValue());
          } catch (JSONException e) {
              e.printStackTrace();
          }
      }
  
      try {
          Log.d(TAG, "Att_Status in obj:\t" + jsonObject.get("att_status") +
                  "\tPlayer id in object:\t" + jsonObject.get("player_id"));
      } catch (JSONException e) {
          e.printStackTrace();
      }
  

  but the log only prints one item and subsequently my network request only posts one item from player_id and att_status. Am I looping through the object items incorrectly? Can someone help out with this? Thanks.
• ImageView custom height based on TextView height

  Hi I have a problem setting the height of a ImageView based on the height of a TextView, this is the code I'm using:

      @Override
  public void onBindViewHolder(@NonNull final viewHolder holder, final int position) {
  
  
      holder.abstractText.setText(events.get(position).abstractTExt);
  
      Rect bounds = new Rect();
      Paint textPaint = holder.abstractText.getPaint();
      textPaint.getTextBounds((String) holder.abstractText.getText(),0,holder.abstractText.getText().length(),bounds);
  
      holder.abstractText.post(new Runnable() {
          @Override
          public void run() {
  
              RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, holder.abstractText.getHeight() + 300);
              holder.borderImage.setLayoutParams(layoutParams);
          }
      });
  }
  

  the problem is that everything works great till I begin to scroll the RecyclerView, when I scroll the height of the image is smaller than the TextView, how can I fix this?
• Recyclerview in fragment not displaying alert dialog result right away

  In my project I have a main activity with 3 fragments that are displayed via a ViewPager in a TabLayout on launch. In one of my fragments I have a RecyclerView and a FAB that, when clicked, launches an alert dialog that captures user input to be displayed in the RV in the fragment. Upon clicking ADD in the dialog, nothing appears in the RV but when I click the FAB and try again, it appears in the RV. So what I am saying, I have to input info in the FAB twice before it displays in my RV in my fragment. So I was wondering if someone could help me understand why this is happening. It seems like my RV in my frag is not being created right away, but all in all my app is not crashing so I have no log to post. I've research but to no avail. I am self taught so any help would be appreciated.

  Fragment

  public class SubjectsFrag extends DialogFragment implements CardAdapter.ClickListener,
          SubjectsEditor.OnAddSubjectListener
  {
      private static final String TAG = SubjectsFrag.class.getSimpleName();
  
      @NonNull
      Context context;
      private EditText titleView, teacherView;
      private String sTitle, sTeacher;
      public EmptyRecyclerView recyclerView;
      public RecyclerView.LayoutManager layoutManager;
      public CardAdapter cardAdapter;
      public SubjectsModel model = null;
      public ArrayList<SubjectsModel> subMod = new ArrayList<>();
      DbHelper dbHelper;
      @BindView(R.id.main_root)
      ViewGroup root;
  
      public SubjectsFrag() {
      }
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
  
      }
  
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
                               Bundle savedInstanceState) {
  
          View view = inflater.inflate(R.layout.fragment_subjects, container, false);
  
          FloatingActionButton fab = view.findViewById(R.id.fab_sub);
          fab.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View view) {
                  showDialog();
              }
          });
  
          titleView = view.findViewById(R.id.edit_subject);
          teacherView = view.findViewById(R.id.edit_subject_teacher);
  
          View emptyView = view.findViewById(R.id.empty_subject_view);
  
          recyclerView = view.findViewById(R.id.recycler_view);
          recyclerView.setHasFixedSize(true);
  
  
          cardAdapter = new CardAdapter(getContext(), subMod);
  
          layoutManager = new LinearLayoutManager(getActivity());
          recyclerView.setLayoutManager(layoutManager);
          recyclerView.setAdapter(cardAdapter);
  
          return view;
      }
  
      @Override
      public void itemClicked(View view, int position) {
  
      }
  
      @Override
      public void OnAddSubjectSubmit(String title, String teacher)
      {
          SubjectsModel model = new SubjectsModel(sTitle, sTeacher);
  
          model.setmTitle(title);
          model.setmTeacher(teacher);
          subMod.add(model);
  
          cardAdapter.notifyDataSetChanged();
  
      }
  
      private void showDialog()
      {
          SubjectsEditor addSubjectDialog = new SubjectsEditor();
          addSubjectDialog.setTargetFragment(this, 0);
          addSubjectDialog.show(getFragmentManager(), null);
  
      }
  }
  

  Dialog Fragment

  public class SubjectsEditor extends DialogFragment
  {
      Context context;
      private OnAddSubjectListener listener;
      @BindView(R.id.main_root)
      ViewGroup root;
  
      public interface OnAddSubjectListener
      {
          void OnAddSubjectSubmit(String title, String teacher);
      }
  
      @Override
      public void onCreate(Bundle savedInstanceState)
      {
          super.onCreate(savedInstanceState);
          try{
              listener = (OnAddSubjectListener) getTargetFragment();
          } catch (ClassCastException e) {
              throw new ClassCastException("Calling fragment must implement onAddSubjectListener");
          }
      }
  
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
                               Bundle savedInstanceState)
      {
          super.onCreate(savedInstanceState);
          return inflater.inflate(R.layout.editor_subjects, container, false);
      }
  
      public Dialog onCreateDialog(Bundle savedInstanceState)
      {
          View view = LayoutInflater.from(getActivity()).inflate(R.layout.editor_subjects, root);
          final EditText mTitle = view.findViewById(R.id.edit_subject);
          final EditText mTeacher = view.findViewById(R.id.edit_subject_teacher);
          AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
          builder.setView(view)
                  .setTitle("Add Subject")
                  .setPositiveButton("Add", new DialogInterface.OnClickListener() {
                      @Override
                      public void onClick(DialogInterface dialog, int which) {
                          final String sTitle = mTitle.getText().toString();
                          final String sTeacher = mTeacher.getText().toString();
  
                          listener.OnAddSubjectSubmit(sTitle, sTeacher);
                      }
                  })
                  .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                      @Override
                      public void onClick(DialogInterface dialog, int which) {
                          dialog.dismiss();
                      }
                  });
          return builder.create();
      }
  }
  

  Recycler Adapter

  public class CardAdapter extends RecyclerView.Adapter<CardAdapter.CardViewHolder>
  {
      public ArrayList<SubjectsModel> subMod;
      private OnItemClicked onClick;
      static ClickListener clickListener;
      Context context;
  
      public CardAdapter(Context context, ArrayList<SubjectsModel> items)
      {
          this.context = context;
          this.subMod = items;
      }
  
      @NonNull
      @Override
      public CardAdapter.CardViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType)
      {
          return new CardViewHolder(LayoutInflater.from(context).inflate(R.layout.subjects_item_list,
                  parent, false));
      }
  
      @Override
      public void onBindViewHolder(final CardAdapter.CardViewHolder holder, final int position)
      {
         SubjectsModel currentSubject = subMod.get(position);
  
          holder.titleView.setText(currentSubject.getmTitle());
          holder.teacher.setText(currentSubject.getmTeacher());
      }
  
      public class CardViewHolder extends RecyclerView.ViewHolder implements
              View.OnClickListener
      {
          TextView titleView;
          TextView teacher;
          CardView cardView;
  
          public CardViewHolder(View itemView)
          {
              super(itemView);
              titleView = itemView.findViewById(R.id.subject_subject);
              teacher = itemView.findViewById(R.id.subject_teacher_text);
              cardView = itemView.findViewById(R.id.card_view);
  
              cardView.setOnClickListener(this);
  
          }
  
          @Override
          public void onClick(View view)
          {
              if (clickListener != null)
              {
                  clickListener.itemClicked(view, getAdapterPosition());
                  Toast.makeText(context, R.string.hello_blank_fragment, Toast.LENGTH_SHORT).show();
              }
          }
      }
  
      @Override
      public int getItemCount()
      {
          return subMod.size();
      }
  
      public interface OnItemClicked
      {
          void onItemClick(int position);
      }
  
      public void setOnClick(OnItemClicked onClick)
      {
          this.onClick = onClick;
      }
  
      public void setClickListener(ClickListener clicked)
      {
          CardAdapter.clickListener = clicked;
      }
  
      public interface ClickListener
      {
          public void itemClicked(View view, int position);
      }
  }
  

  Fragment 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:id="@+id/main_root">
  
  
      <com.example.ashleighwilson.schoolscheduler.adapter.EmptyRecyclerView
          android:id="@+id/recycler_view"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:layout_marginTop="60dp"/>
  
     <RelativeLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_centerInParent="true">
  
      <TextView
          android:id="@+id/empty_subject_view"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:gravity="center"
          android:visibility="gone"
          android:text="@string/no_subjects"/>
  
     </RelativeLayout>
  
      <android.support.design.widget.FloatingActionButton
          android:id="@+id/fab_sub"
          style="@style/FAB" />
  
  </RelativeLayout>
  

  Main Activity

  public class OverviewActivity extends AppCompatActivity
  {
  
      private NavigationView mNavigationView;
      private DrawerLayout drawer;
      private ActionBarDrawerToggle toggle;
      CharSequence tabTitles[] = {"SUBJECTS", "TASKS", "CALENDER"};
      int numOfTabs = 3;
  
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main_nav);
  
          Toolbar toolbar = findViewById(R.id.main_toolbar);
          setSupportActionBar(toolbar);
  
          final ViewPager viewPager = findViewById(R.id.viewpager);
  
          ViewPagerAdapter adapter = new ViewPagerAdapter(this, getSupportFragmentManager(), tabTitles, numOfTabs);
          viewPager.setAdapter(adapter);
  
          TabLayout tabLayout = findViewById(R.id.tabs);
          tabLayout.setupWithViewPager(viewPager);
  
          drawer = findViewById(R.id.drawer_layout);
          toggle = new ActionBarDrawerToggle(
                      this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
          toggle.syncState();
  
          mNavigationView = findViewById(R.id.nav_view);
          setupDrawerContent(mNavigationView);
  
         /* FloatingActionButton fab = findViewById(R.id.fab);
          fab.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View view) {
                  Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                          .setAction("Action", null).show();
              }
          }); */
  
          viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
          tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
              @Override
              public void onTabSelected(TabLayout.Tab tab)
              {
                  viewPager.setCurrentItem(tab.getPosition());
              }
  
              @Override
              public void onTabUnselected(TabLayout.Tab tab) {
  
              }
  
              @Override
              public void onTabReselected(TabLayout.Tab tab) {
  
              }
          });
      }
  
      @Override
      public void onBackPressed()
      {
          //DrawerLayout drawer = findViewById(R.id.drawer_layout);
          if (drawer.isDrawerOpen(GravityCompat.START))
          {
              drawer.closeDrawer(GravityCompat.START);
          }
          else
              super.onBackPressed();
      }
  
      @Override
      public boolean onCreateOptionsMenu(Menu menu) {
          // Inflate the menu; this adds items to the action bar if it is present.
          getMenuInflater().inflate(R.menu.main_nav, menu);
          return true;
      }
  
      @Override
      public boolean onOptionsItemSelected(MenuItem item) {
          // Handle action bar item clicks here. The action bar will
          // automatically handle clicks on the Home/Up button, so long
          // as you specify a parent activity in AndroidManifest.xml.
          int id = item.getItemId();
  
          //noinspection SimplifiableIfStatement
          if (id == R.id.action_settings) {
              return true;
          }
  
          return super.onOptionsItemSelected(item);
      }
  
      private void setupDrawerContent(NavigationView navigationView)
      {
          navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
              @Override
              public boolean onNavigationItemSelected(@NonNull MenuItem menuItem)
              {
                  selectDrawerItem(menuItem);
                  return true;
              }
          });
      }
  
      public void selectDrawerItem(MenuItem menuItem)
      {
          switch (menuItem.getItemId())
          {
              case R.id.nav_grades:
                  Intent gradesIntent = new Intent(this, GradesActivity.class);
                  startActivity(gradesIntent);
                  break;
              case R.id.nav_notes:
                  Intent notesIntent = new Intent(this, NotesActivity.class);
                  startActivity(notesIntent);
                  break;
          }
  
          menuItem.setChecked(true);
          setTitle(menuItem.getTitle());
          drawer.closeDrawer(GravityCompat.START);
      }
  
  }
  
• Android Studio Recyclerview change values of Seekbar

  I'm making a bill splitter and I'm trying to create a RecyclerView which hosts items which represents the people in the group that you're trying to split the bill with. I want to use seekbars to change the percentage of the bill that one person has to pay.

  Image of the base design:

  

  So as a example let's say I change the seekbar progress for Person A from 25% to 79%, I then want the progress of the seekbars of Person B, C and D to be 7% because 100% - 79% = 21% / 3 persons = 7%

  Image after change:

  

  The problem is that I don't know how to change the other seekbars progress when I change the seekbar progress of Person A.

  Here is my code:

  public class PersonListAdapter extends RecyclerView.Adapter<PersonListAdapter.PersonListViewHolder> {
  
      private ArrayList<Person> mPersonList = new ArrayList<>();
  
      public class PersonListViewHolder extends RecyclerView.ViewHolder {
  
          TextView mPersonText, mMoneyText, mPercentageText;
          SeekBar mPercentageSeekbar;
          MaterialAnimatedSwitch mLockSwitch;
  
          public PersonListViewHolder(final View itemView) {
              super(itemView);
              mPersonText = itemView.findViewById(R.id.person_name_text);
              mMoneyText = itemView.findViewById(R.id.money_text);
              mPercentageText = itemView.findViewById(R.id.money_percentage_text);
              mPercentageSeekbar = itemView.findViewById(R.id.money_seekbar);
              mLockSwitch = itemView.findViewById(R.id.lock_switch);
          }
      }
  
      public PersonListAdapter(int billTotal, int persons) {
          for (int i = 0; i < persons; i++) {
  
              // simulating values
              mPersonList.add(new Person('a', new BigDecimal(10), 10));
          }
      }
  
      @NonNull
      @Override
      public PersonListViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
          View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.person_item, parent, false);
          return new PersonListViewHolder(view);
      }
  
      @Override
      public void onBindViewHolder(@NonNull final PersonListViewHolder holder, int position) {
          final Person person = mPersonList.get(position);
  
          holder.mPersonText.setText("Person " + person.name.toString().toUpperCase());
          holder.mMoneyText.setText("$" + String.valueOf(person.money));
          holder.mPercentageText.setText(String.valueOf(person.percentage) + "%");
          holder.mPercentageSeekbar.setProgress(Integer.valueOf(person.percentage.setScale(0, RoundingMode.HALF_UP).toString()));
  
          holder.mPercentageSeekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
              @Override
              public void onProgressChanged(SeekBar seekBar, int progress, boolean b) {
  
                  // What to do???
  
              }
  
              @Override
              public void onStartTrackingTouch(SeekBar seekBar) {
  
              }
  
              @Override
              public void onStopTrackingTouch(SeekBar seekBar) {
  
              }
          });
      }
  
      @Override
      public int getItemCount() {
          return mPersonList.size();
      }
  
      class Person {
          Character name;
          BigDecimal money;
          int percentage;
  
          Person(Character name, BigDecimal money, int percentage) {
              this.name = name;
              this.money = money;
              this.percentage = percentage;
          }
  
          public void setPercentage(int percentage) {
              this.percentage = percentage;
          }
      }
  }
  
• Firebase FirebaseRecyclerAdapter key issue

  I use FirebaseRecyclerAdapter in my project and I can get data from firebase with this keys:

  private String title;
  private String desc;
  private String image;
  private String url;
  private int id;
  

  but I don't get data from firebase if I use this key

  private String classname;
  private id classno;
  

  FirebaseRecyclerAdapter codes;

  DatabaseReference personsRef = FirebaseDatabase.getInstance().getReference().child("users");
  Query personsQuery = personsRef.orderByKey();
  
  mPeopleRV.hasFixedSize();
  int numberOfColumns = 1;
  RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(getApplicationContext(), numberOfColumns);
  mPeopleRV.setLayoutManager(mLayoutManager);
  FirebaseRecyclerOptions personsOptions = new FirebaseRecyclerOptions.Builder<Data>().setQuery(personsQuery, Data.class).build();
  
  mPeopleRVAdapter = new FirebaseRecyclerAdapter<Data, NewsViewHolder>(personsOptions) {
      @Override
      protected void onBindViewHolder(MainActivity.NewsViewHolder holder, final int position, final Data model) {
          holder.setTitle(model.getTitle());
      }
  
      @Override
      public MainActivity.NewsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
  
          View view = LayoutInflater.from(parent.getContext())
                  .inflate(R.layout.users_row, parent, false);
  
          return new MainActivity.NewsViewHolder(view);
      }
  };
  
  mPeopleRV.setAdapter(mPeopleRVAdapter);
  

  Data.class

  public class Data {
  
      private String title;
      private String image;
      private int id;
  
      private String classname;
      private int classno;
  
      public String getTitle() {
          return title;
      }
  
      public String getImage() {
          return image;
      }
  
      public int getId() {
          return id;
      }
  
      public String getClassname() {
          return classname;
      }
  
      public int getClassno() {
          return classno;
      }
  }
  

  I want to get data with "classname" and "classno" keys. How Can I do that? Thank you.
• Enlarge the image to fullscreen when clicking on the recyclerView item

  Before you mark it as duplicate. Please read.

  I am building a chat app. I am receiving the messages(both text and images) in a recyclerView and I have a typical Adapter Class.

  Now I want whenever I click o the image it should enlarge to the fullscreen. I have seen solution to this situation but they didn't get me anywhere. Some said opening another activity and passing the URL but then the image is downloaded twice.

  Any help will be appreciated. Just the approarch will be fine if not the code. Thanks.

  Below is part of my adapter class:

  @Override
  public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
      switch (holder.getItemViewType()){
          case 1:
              ViewHolder1 viewHolder1 = (ViewHolder1)holder;
              viewHolder1.Text.setText(messageList.get(position).getMessage());
              break;
  
          case 2:
              ViewHolder2 viewHolder2 = (ViewHolder2)holder;
              Glide.with(viewHolder2.Image.getContext())
                      .load(messageList.get(position).getMessage())
                      .placeholder(R.drawable.ic_image_send_24dp)
                      .crossFade()
                      .centerCrop()
                      .diskCacheStrategy(DiskCacheStrategy.ALL)
                      .into(viewHolder2.Image);
  
              viewHolder2.Image.setOnClickListener(new View.OnClickListener() {
                  @Override
                  public void onClick(View v) {
                      Intent intent= new Intent(context,FullScreenImage.class);
                      intent.putExtra("image_url", messageList.get(position).getMessage());
                      intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                      context.startActivity(intent);
                  }
              });
              break;
      }
  }