刷新firestorerecycleradapter而不重新启动活动

rwqw0loc  于 2021-07-05  发布在  Java
关注(0)|答案(2)|浏览(445)

我尝试构建的应用程序必须有一个微调器，可以动态更改recyclerview的项。此时，当微调器项被更改时，什么也不会发生，但当我打开另一个活动然后返回时，数据就会更改。如何在微调器所选项被更改时更改数据。下面是我的代码

  1. package com.example.tutorscape;
  3. import androidx.annotation.NonNull;
  4. import androidx.fragment.app.Fragment;
  5. import androidx.fragment.app.FragmentManager;
  6. import androidx.fragment.app.FragmentTransaction;
  7. import androidx.recyclerview.widget.LinearLayoutManager;
  8. import androidx.recyclerview.widget.RecyclerView;
  10. import android.content.Intent;
  11. import android.os.Bundle;
  12. import android.util.Log;
  13. import android.view.LayoutInflater;
  14. import android.view.View;
  15. import android.view.ViewGroup;
  16. import android.widget.AdapterView;
  17. import android.widget.ImageView;
  18. import android.widget.LinearLayout;
  19. import android.widget.Spinner;
  20. import android.widget.TextView;
  21. import android.widget.Toast;
  23. import com.firebase.ui.firestore.FirestoreRecyclerAdapter;
  24. import com.firebase.ui.firestore.FirestoreRecyclerOptions;
  25. import com.google.firebase.auth.FirebaseAuth;
  26. import com.google.firebase.auth.FirebaseUser;
  27. import com.google.firebase.firestore.FirebaseFirestore;
  28. import com.google.firebase.firestore.Query;
  29. import com.squareup.picasso.Picasso;
  31. import jp.wasabeef.picasso.transformations.CropCircleTransformation;
  33. public class TutorListActivity extends BaseActivity {
  35.     private SqliteDatabase mDatabase;
  36.     boolean isFragmentLoaded;
  37.     Fragment menuFragment;
  38.     TextView title;
  39.     ImageView menuButton;
  41.     private static final String TAG = "SignedInActivity";
  43.     //Firebase
  44.     private FirebaseAuth.AuthStateListener mAuthListener;
  46.     // widgets and UI References
  48.     private RecyclerView mFirebaseList;
  49.     private FirebaseFirestore firebaseFirestore;
  51.     private FirestoreRecyclerAdapter adapter;
  53.     @Override
  54.     protected void onResume() {
  55.         super.onResume();
  56.         checkAuthenticationState();
  57.     }
  59.     private void checkAuthenticationState(){
  61.         FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
  63.         if(user == null){
  64.             Intent intent = new Intent(TutorListActivity.this, LoginStudent.class);
  65.             intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
  66.             startActivity(intent);
  67.             finish();
  68.         }else{
  69.             Log.d(TAG, "checkAuthenticationState: user is authenticated.");
  70.         }
  71.     }
  73.     @Override
  74.     protected void onCreate(Bundle savedInstanceState) {
  75.         super.onCreate(savedInstanceState);
  76.         initAddlayout(R.layout.activity_tutor_list);
  77.         Spinner spinner =(Spinner)findViewById(R.id.spinner);
  78.         firebaseFirestore = FirebaseFirestore.getInstance();
  79.         mFirebaseList = findViewById(R.id.recyclerView);
  81.         mDatabase = new SqliteDatabase(this);
  83.         title = (TextView) findViewById(R.id.title_top);
  84.         menuButton = (ImageView) findViewById(R.id.menu_icon);
  85.         title.setText("Menu Activity");
  86.         menuButton.setOnClickListener(new View.OnClickListener() {
  87.             @Override
  88.             public void onClick(View v) {
  89.                 if (!isFragmentLoaded) {
  90.                     loadFragment();
  91.                     title.setText("Profile");
  92.                 } else {
  93.                     if (menuFragment != null) {
  94.                         if (menuFragment.isAdded()) {
  95.                             hideFragment();
  96.                         }
  97.                     }
  98.                 }
  99.             }
  100.         });
  102.         Query query = firebaseFirestore.collection("Admin");
  104.         FirestoreRecyclerOptions<Model> options = new FirestoreRecyclerOptions.Builder<Model>()
  105.                 .setQuery(query, Model.class)
  106.                 .build();
  107.         adapter = new FirestoreRecyclerAdapter<Model, MyViewHolder>(options) {
  108.             @NonNull
  109.             @Override
  110.             public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
  111.                 View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);
  113.                 return new MyViewHolder(view);
  114.             }
  116.             @Override
  117.             protected void onBindViewHolder(@NonNull MyViewHolder holder, int position, @NonNull Model model) {
  119.                 holder.list_name.setText(model.getName());
  120.                 holder.list_title.setText(model.getTitle());
  122.                 holder.list_imageText.setText(model.getImage());
  123.                 holder.weeklyRate.setText(model.getWeeklyRate());
  124.                 holder.subject.setText(model.getSubject());
  125.                 holder.phone.setText(model.getPhone());
  126.                 holder.trial.setText(model.getTrial());
  128.                 Picasso.get()
  129.                         .load(model.getImage())
  130.                         //   .centerCrop()
  131.                         // .placeholder(R.drawable.account)
  132.                         // .resize(w, h)
  133.                         .transform(new CropCircleTransformation())
  134.                         .into(holder.imageView);
  135.             }
  136.         };
  138.         mFirebaseList.setHasFixedSize(true);
  139.         mFirebaseList.setLayoutManager(new LinearLayoutManager(TutorListActivity.this));
  140.         mFirebaseList.setAdapter(adapter);
  142.         spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
  143.             @Override
  144.             public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
  146.                 if(position==0){
  147.                     Query query = firebaseFirestore.collection("Admin");
  148.                     FirestoreRecyclerOptions<Model> options = new FirestoreRecyclerOptions.Builder<Model>()
  149.                             .setQuery(query, Model.class)
  150.                             .build();
  151.                     adapter = new FirestoreRecyclerAdapter<Model, MyViewHolder>(options) {
  152.                         @NonNull
  153.                         @Override
  154.                         public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
  155.                             View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);
  156.                             return new MyViewHolder(view);
  157.                         }
  158.                         @Override
  159.                         protected void onBindViewHolder(@NonNull MyViewHolder holder, int position, @NonNull Model model) {
  160.                             holder.list_name.setText(model.getName());
  161.                             holder.list_title.setText(model.getTitle());
  163.                             holder.list_imageText.setText(model.getImage());
  164.                             holder.weeklyRate.setText(model.getWeeklyRate());
  165.                             holder.subject.setText(model.getSubject());
  166.                             holder.phone.setText(model.getPhone());
  167.                             holder.trial.setText(model.getTrial());
  169.                             Picasso.get()
  170.                                     .load(model.getImage())
  171.                                     //   .centerCrop()
  172.                                     // .placeholder(R.drawable.account)
  173.                                     // .resize(w, h)
  174.                                     .transform(new CropCircleTransformation())
  175.                                     .into(holder.imageView);
  176.                         }
  177.                     };
  178.                     mFirebaseList.setHasFixedSize(true);
  179.                     mFirebaseList.setLayoutManager(new LinearLayoutManager(TutorListActivity.this));
  180.                     mFirebaseList.setAdapter(adapter);
  181.                 }else if(position==1){
  183.                     Query query = firebaseFirestore.collection("one");
  184.                     FirestoreRecyclerOptions<Model> options = new FirestoreRecyclerOptions.Builder<Model>()
  185.                             .setQuery(query, Model.class)
  186.                             .build();
  187.                     adapter = new FirestoreRecyclerAdapter<Model, MyViewHolder>(options) {
  188.                         @NonNull
  189.                         @Override
  190.                         public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
  191.                             View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);
  192.                             return new MyViewHolder(view);
  193.                         }
  194.                         @Override
  195.                         protected void onBindViewHolder(@NonNull MyViewHolder holder, int position, @NonNull Model model) {
  196.                             holder.list_name.setText(model.getName());
  197.                             holder.list_title.setText(model.getTitle());
  199.                             holder.list_imageText.setText(model.getImage());
  200.                             holder.weeklyRate.setText(model.getWeeklyRate());
  201.                             holder.subject.setText(model.getSubject());
  202.                             holder.phone.setText(model.getPhone());
  203.                             holder.trial.setText(model.getTrial());
  205.                             Picasso.get()
  206.                                     .load(model.getImage())
  207.                                     //   .centerCrop()
  208.                                     // .placeholder(R.drawable.account)
  209.                                     // .resize(w, h)
  210.                                     .transform(new CropCircleTransformation())
  211.                                     .into(holder.imageView);
  212.                         }
  213.                     };
  214.                     mFirebaseList.setHasFixedSize(true);
  215.                     mFirebaseList.setLayoutManager(new LinearLayoutManager(TutorListActivity.this));
  216.                     mFirebaseList.setAdapter(adapter);
  217.                 }else if(position==2){
  219.                 }else if (position==3){
  221.                 }else if(position==4){
  223.                 }else if(position==5){
  225.                 }else if (position==6){
  227.                 }
  228.             }
  230.             @Override
  231.             public void onNothingSelected(AdapterView<?> parent) {
  233.             }
  234.         });
  236.     }
  238.     private class MyViewHolder extends RecyclerView.ViewHolder {
  240.         private TextView list_name, subject, weeklyRate, trial, phone;
  241.         private TextView list_title, list_imageText;
  242.         private ImageView imageView;
  244.         public MyViewHolder(@NonNull View itemView) {
  245.             super(itemView);
  247.             subject = itemView.findViewById(R.id.textViewSubject);
  248.             weeklyRate = itemView.findViewById(R.id.textViewWeeklyRate);
  249.             trial = itemView.findViewById(R.id.textViewTrial);
  250.             phone = itemView.findViewById(R.id.textViewPhone);
  252.             list_imageText = itemView.findViewById(R.id.phoneTextView);
  253.             list_name = itemView.findViewById(R.id.textViewName);
  254.             list_title = itemView.findViewById(R.id.textViewTitle);
  255.             imageView = itemView.findViewById(R.id.imageView);
  257.             itemView.setOnClickListener(new View.OnClickListener() {
  258.                 @Override
  259.                 public void onClick(View v) {
  261.                     final String name = list_name.getText().toString();
  262.                     final String ph_no = subject.getText().toString();
  263.                     final String title = list_title.getText().toString();
  264.                     final String sweekly = weeklyRate.getText().toString();
  265.                     final String strial = trial.getText().toString();
  267.                     final String image = list_imageText.getText().toString();
  269.                     final String smsNumber = phone.getText().toString();
  271.                     Contacts newContact = new Contacts(name, ph_no, title, image, sweekly, strial, smsNumber);
  272.                     mDatabase.addContacts(newContact);
  274.                     //  String smsNumber = "263774233406"; // E164 format without '+' sign
  275.                     Intent sendIntent = new Intent(Intent.ACTION_SEND);
  276.                     sendIntent.setType("text/plain");
  277.                     sendIntent.putExtra(Intent.EXTRA_TEXT, "Hello Mr Russo.");
  278.                     sendIntent.putExtra("jid", smsNumber + "@s.whatsapp.net"); //phone number without "+" prefix
  279.                     sendIntent.setPackage("com.whatsapp");
  281.                 /*if (sendIntent.resolveActivity(getActivity().getPackageManager()) == null) {
  282.                     Toast.makeText(this, "Error/n" + e.toString(), Toast.LENGTH_SHORT).show();
  283.                     return;
  284.                 }
  285.                 */
  286.                     startActivity(sendIntent);
  288.                 }
  289.             });
  291.         }
  293.     }
  295.     @Override
  296.     protected void onStart() {
  297.         super.onStart();
  298.         adapter.startListening();
  299.     }
  301.     @Override
  302.     protected void onStop() {
  303.         super.onStop();
  304.         adapter.stopListening();
  305.     }
  307.     public void hideFragment() {
  308.         FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
  309.         fragmentTransaction.setCustomAnimations(R.anim.slide_down, R.anim.slide_up);
  310.         fragmentTransaction.remove(menuFragment);
  311.         fragmentTransaction.commit();
  312.         menuButton.setImageResource(R.drawable.ic_round_notes);
  313.         isFragmentLoaded = false;
  314.         title.setText("Main Activity");
  315.     }
  317.     public void loadFragment() {
  318.         FragmentManager fm = getSupportFragmentManager();
  319.         menuFragment = fm.findFragmentById(R.id.container);
  320.         menuButton.setImageResource(R.drawable.my_up);
  321.         if (menuFragment == null) {
  322.             menuFragment = new MenuFragment();
  323.             FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
  324.             fragmentTransaction.setCustomAnimations(R.anim.slide_down, R.anim.slide_up);
  325.             fragmentTransaction.add(R.id.container, menuFragment);
  326.             fragmentTransaction.commit();
  327.         }
  329.         isFragmentLoaded = true;
  330.     }
  331.     @Override
  332.     public void onBackPressed() {
  333.         if (isFragmentLoaded=true){
  334.             FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
  335.             fragmentTransaction.setCustomAnimations(R.anim.slide_down, R.anim.slide_up);
  336.             fragmentTransaction.remove(menuFragment);
  337.             fragmentTransaction.commit();
  338.             menuButton.setImageResource(R.drawable.ic_round_notes);
  339.             isFragmentLoaded = false;
  340.             title.setText("Main Activity");
  341.         }else{
  342.             super.onBackPressed();
  343.         }
  344.     }
  346.     public void signOut() {
  347.         Log.d(TAG, "signOut: signing out");
  348.         FirebaseAuth.getInstance().signOut();
  350.         //     SharedPreferences.Editor editor = getSharedPreferences(myPrefs, MODE_PRIVATE).edit();
  351.         //   editor.putBoolean("isStudent", false);
  352.         // editor.apply();
  354.         Intent intent = new Intent(TutorListActivity.this, WelcomeActivity.class);
  355.         intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
  356.         startActivity(intent);
  357.         finish();
  359.     }
  361.     /*
  362.             ----------------------------- Firebase setup ---------------------------------
  363.          */
  365.     private void setupFirebaseAuth(){
  366.         Log.d(TAG, "setupFirebaseAuth: started.");
  368.         mAuthListener = new FirebaseAuth.AuthStateListener() {
  369.             @Override
  370.             public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
  371.                 FirebaseUser user = firebaseAuth.getCurrentUser();
  372.                 if (user != null) {
  374.                     Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid());
  376.                 } else {
  377.                     Log.d(TAG, "onAuthStateChanged:signed_out");
  378.                     Intent intent = new Intent(TutorListActivity.this, LoginStudent.class);
  379.                     intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
  380.                     startActivity(intent);
  381.                     finish();
  382.                 }
  383.                 // ...
  384.             }
  385.         };
  386.     }
  387. }
Javaandroidfirebase-realtime-databaseandroid-recyclerviewgoogle-cloud-firestore

2条答案

按热度按时间
qnyhuwrf

qnyhuwrf1#

如果我正确地阅读了您的代码，您希望适配器在图像加载到以下位置后刷新ui：

  1. Picasso.get()
  2.         .load(model.getImage())
  3.         //   .centerCrop()
  4.         // .placeholder(R.drawable.account)
  5.         // .resize(w, h)
  6.         .transform(new CropCircleTransformation())
  7.         .into(holder.imageView);

在这种情况下，您可以将回调传递给 into 打电话给我 adapter.notifyDataSetChanged 在那里。

  1. .into(holder.imageView, new Callback() {
  2.     @Override
  3.     public void onSuccess() {
  4.         adapter.notifyDataSetChanged();
  6.     }
  8.     @Override
  9.     public void onError(java.lang.Exception e) {
  10.         Log.e("Image", "Error loading image", e);
  11.     }
  12. );
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bt1cpqcv

bt1cpqcv2#

添加了adapter.startlistening（）；在每一个项目点击，现在它的工作…每个项目现在看起来如下

  1. else if (position==6){
  3.                     Query query = firebaseFirestore.collection("six");
  4.                     FirestoreRecyclerOptions<Model> options = new FirestoreRecyclerOptions.Builder<Model>()
  5.                             .setQuery(query, Model.class)
  6.                             .build();
  7.                     adapter = new FirestoreRecyclerAdapter<Model, MyViewHolder>(options) {
  8.                         @NonNull
  9.                         @Override
  10.                         public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
  11.                             View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);
  12.                             return new MyViewHolder(view);
  13.                         }
  14.                         @Override
  15.                         protected void onBindViewHolder(@NonNull MyViewHolder holder, int position, @NonNull Model model) {
  16.                             holder.list_name.setText(model.getName());
  17.                             holder.list_title.setText(model.getTitle());
  19.                             holder.list_imageText.setText(model.getImage());
  20.                             holder.weeklyRate.setText(model.getWeeklyRate());
  21.                             holder.subject.setText(model.getSubject());
  22.                             holder.phone.setText(model.getPhone());
  23.                             holder.trial.setText(model.getTrial());
  25.                             Picasso.get()
  26.                                     .load(model.getImage())
  27.                                     //   .centerCrop()
  28.                                     // .placeholder(R.drawable.account)
  29.                                     // .resize(w, h)
  30.                                     .transform(new CropCircleTransformation())
  31.                                     .into(holder.imageView);
  32.                         }
  33.                     };
  34.                     mFirebaseList.setHasFixedSize(true);
  35.                     mFirebaseList.setLayoutManager(new LinearLayoutManager(TutorListActivity.this));
  36.                     mFirebaseList.setAdapter(adapter);
  38.                     adapter.startListening();
  39.                     adapter.notifyDataSetChanged();
  40.                 }

效果很好

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