在cardview中实现OnClickListener获取具体数据

Question

使用我目前拥有的代码，当 Onclick 任何卡片视图 [图 2] 时，我可以检索每个出勤详细信息 [图 3]。

现在，我希望得到每个cardview中的具体数据。

流程：userlist.java [在此处实现 OnClickListener]-> userlist1.java

希望结果：

CardView 1 [info:test3] -> 1 出勤率 (MdkeONsLFaBK9DgyKMu)

CardView 2 [info:rea] -> 2 出勤 (Mdkf_TBTWI4D6yRyGLa) & (Mdkfbbtb2mRUZXEIwdr)

userlist.class

public class userlist extends AppCompatActivity {

    RecyclerView recyclerView;
    DatabaseReference database, ab;
    MyAdapter myAdapter;
    ArrayList<Report> list;
    String uid;
    private FirebaseAuth auth;
    private FirebaseUser user;
    Menu menu;
    private SearchView searchView = null;
    private SearchView.OnQueryTextListener queryTextListener;
    SharedPreferences sharedpreferences;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_userlist);

        user = auth.getInstance().getCurrentUser();
        uid = user.getUid();

        recyclerView = findViewById(R.id.userlist);
        searchView = findViewById(R.id.action_search);

        SharedPreferences sharedPreferences = getSharedPreferences("myKey", MODE_PRIVATE);
        String key = sharedPreferences.getString("key","");
        String temp = sharedPreferences.getString("temp","");


        database = FirebaseDatabase.getInstance().getReference("Class Information");
        ab = database.child(uid).child("Student Attend");

        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        list = new ArrayList<>();
        myAdapter = new MyAdapter(this, list);
        recyclerView.setAdapter(myAdapter);

        ab.addValueEventListener(new ValueEventListener() {

            @Override
            public void onDataChange(@NonNull DataSnapshot snapshot) {
                for (DataSnapshot dataSnapshot : snapshot.getChildren()) {

                    Report report = dataSnapshot.getValue(Report.class);
                    list.add(report);

                }
                myAdapter.notifyDataSetChanged();

            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {

            }
        });
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu, menu);

        // Associate searchable configuration with the SearchView
        SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
        searchView = (SearchView) menu.findItem(R.id.action_search)
                .getActionView();
        searchView.setSearchableInfo(searchManager
                .getSearchableInfo(getComponentName()));
        searchView.setMaxWidth(Integer.MAX_VALUE);

        // listening to search query text change
        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                // filter recycler view when query submitted
                myAdapter.getFilter().filter(query);
                return false;
            }

            @Override
            public boolean onQueryTextChange(String query) {
                // filter recycler view when text is changed
                myAdapter.getFilter().filter(query);
                return false;
            }
        });
        return true;
    }


    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()) {
            case R.id.menu_dateascending:
                Collections.sort(list, Report.ReportDateOldestComparator);
                Toast.makeText(userlist.this, "Sort by Date [Oldest - Latest]", Toast.LENGTH_SHORT).show();
                myAdapter.notifyDataSetChanged();
                return true;

            case R.id.menu_descending:
                Collections.sort(list, Report.ReportDateLatestComparator);
                Toast.makeText(userlist.this, "Sort by Date [Latest - Oldest]", Toast.LENGTH_SHORT).show();
                myAdapter.notifyDataSetChanged();
                return true;
            case R.id.action_search:
                // Not implemented here
                return false;
            default:
                break;
        }
        searchView.setOnQueryTextListener(queryTextListener);
        return super.onOptionsItemSelected(item);
    }
}

MyAdapter.java

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder>implements Filterable {


    Context context;
    ArrayList<Report> list;
    ArrayList<Report> listfilter;
    SharedPreferences sharedpreferences;


    public MyAdapter(Context context, ArrayList<Report> list) {
        this.context = context;
        this.list = list;
        this.listfilter = list;

    }


    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(context).inflate(R.layout.item,parent,false);
        return new MyViewHolder(v);


    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {

        Report report = list.get(position);
        holder.time.setText(report.getTime());
        holder.duration.setText(report.getDuration());
        holder.info.setText(report.getInfo());

    }

    @Override
    public int getItemCount() {
        return list.size();
    }

    @Override
    public Filter getFilter() {
        return new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence charSequence) {
                String charString = charSequence.toString();
                if (charString.isEmpty()) {
                    list = listfilter;
                } else {
                    List<Report> filteredList = new ArrayList<>();
                    for (Report row : listfilter) {

                        // name match condition. this might differ depending on your requirement
                        // here we are looking for name or phone number match
                        if (row.getInfo().toLowerCase().contains(charString.toLowerCase()) || row.getTime().contains(charSequence)) {
                            filteredList.add(row);
                        }
                    }
                    list = (ArrayList<Report>) filteredList;
                }

                FilterResults filterResults = new FilterResults();
                filterResults.values = list;
                return filterResults;
            }

            @Override
            protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
                list = (ArrayList<Report>) filterResults.values;
                notifyDataSetChanged();
            }
        };
    }


    public class MyViewHolder extends RecyclerView.ViewHolder { 

        TextView duration, time, info;
        public View view;
        String key, temp;

        public MyViewHolder(@NonNull View itemView) {
            super(itemView);

            time = itemView.findViewById(R.id.tvtemp);
            duration = itemView.findViewById(R.id.tvfirstName);
            info = itemView.findViewById(R.id.tvmatno);

            SharedPreferences sharedPreferences = context.getSharedPreferences("myKey", Context.MODE_PRIVATE);
            String key = sharedPreferences.getString("key","");
            String temp = sharedPreferences.getString("temp","");

            itemView.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View itemView) {

                    sharedpreferences = context.getSharedPreferences("myKey", Context.MODE_PRIVATE);
                    SharedPreferences.Editor editor = sharedpreferences.edit();
                    editor.putString("key", key);
                    editor.putString("temp", temp);
                    editor.apply();

                    Intent intent = new Intent(itemView.getContext(), userlist1.class);
                    itemView.getContext().startActivity(intent);// pass key to next activity;

                    Toast.makeText(itemView.getContext(), "Data retrieved from database", Toast.LENGTH_SHORT).show();

                }
            });
        }
    }
}

Report.java

public class Report {

    public String duration;
    public String time;
    public String info;

    public Report(){

    }

    public void setDuration(String duration) {
        this.duration = duration;
    }

    public void setTime(String time) {
        this.time = time;
    }

    public void setInfo(String info) {
        this.info = info;
    }


    public String getDuration() {
        return duration;
    }

    public String getTime() {
        return time;
    }

    public String getInfo() {
        return info;
    }

    public static Comparator<Report> ReportDateOldestComparator = new Comparator<Report>() {
        @Override

        public int compare(Report o1, Report o2) {
            return o1.getTime().compareTo(o2.getTime());

        }
    };

    public static Comparator<Report> ReportDateLatestComparator = new Comparator<Report>() {
        @Override

        public int compare(Report o1, Report o2) {
            return o2.getTime().compareTo(o1.getTime());

        }
    };
}

userlist1.java

public class userlist1 extends AppCompatActivity {

    RecyclerView recyclerView;
    DatabaseReference database,ab;
    MyAdapter1 myAdapter1;
    ArrayList<Report1> list;
    String uid;
    private FirebaseAuth auth;
    private FirebaseUser user;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_userlist1);

        user = auth.getInstance().getCurrentUser();
        uid = user.getUid();

        recyclerView = findViewById(R.id.userlist1);


        SharedPreferences sharedPreferences = getSharedPreferences("myKey", MODE_PRIVATE);
        String key = sharedPreferences.getString("key","");
        String temp = sharedPreferences.getString("temp","");
        String abc = sharedPreferences.getString("abc","");


        database = FirebaseDatabase.getInstance().getReference("Class Information");
        ab = database.child(uid).child("Student Attend");
        //ab = database.child(uid).child("Student Attend").child(key).child("Attendance");
        //ab = database.child(uid).child("Student Attend").child("test").child(key);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        list = new ArrayList<>();

        //ArrayList<Report1> list = new ArrayList<Report1>();
        myAdapter1 = new MyAdapter1(this,list);
        recyclerView.setAdapter(myAdapter1);


        ab.addListenerForSingleValueEvent(new ValueEventListener() {

            @Override
            public void onDataChange(@NonNull DataSnapshot snapshot) {
                for (DataSnapshot childSnapshot : snapshot.getChildren()) {

                    /*List<Report1>list = new ArrayList<>();*/
                    for (DataSnapshot dataSnapshot : childSnapshot.child("Attendance").getChildren()) {


                        Report1 report1 = dataSnapshot.getValue(Report1.class);
                        list.add(report1);
                    }
                }
           myAdapter1.notifyDataSetChanged();
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
                throw databaseError.toException(); // 

            }
        });
    }
}

MyAdapter1.java

public class MyAdapter1 extends RecyclerView.Adapter<MyAdapter1.MyViewHolder> {

    Context context;
    ArrayList<Report1> list;

    public MyAdapter1(Context context, ArrayList<Report1> list) {
        this.context = context;
        this.list = list;
    }


    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(context).inflate(R.layout.item1,parent,false);
        return new MyViewHolder(v);
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {

        Report1 report1 = list.get(position);
        holder.matricno.setText(report1.getMatricno());
        holder.password.setText(report1.getPassword());
        holder.temp.setText(report1.getTemp());
    }

    public long getItemId(int position) {
        return position;
    }

    @Override
    public int getItemViewType(int position) {
        return position;
    }

    @Override
    public int getItemCount() {

        return list.size();
    }

    public class MyViewHolder extends RecyclerView.ViewHolder{ //public static class

        TextView matricno, password, temp;
        public View view;

        public MyViewHolder(@NonNull View itemView){
            super(itemView);

            matricno = itemView.findViewById(R.id.tvmno);
            password = itemView.findViewById(R.id.tvpassword);
            temp = itemView.findViewById(R.id.tvtemperature);


            itemView.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View itemView) {

                    Toast.makeText(itemView.getContext(), "Data retrieved from database", Toast.LENGTH_SHORT).show();

                }
            });
        }
    }
}

Report1.java

public class Report1 {
    public String matricno;
    public String password;
    public String temp;

public Report1(){
}

    public String getMatricno() {
        return matricno;
    }

    public String getPassword() {
        return password;
    }

    public String getTemp() {
        return temp;
    }
    public void setMatricno(String matricno) {
        this.matricno = matricno;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public void setTemp(String temp) {
        this.temp = temp;
    }

}

Answer 1

新建一个Activity，获取Item的position。通过Intent传递数据。

holder.myItem.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View itemView) {
                    Intent intent = new Intent(getApplicationContext(),ViewItemDetails.class);
                    intent.putExtra(“yourKey1”, value1);
                    intent.putExtra(“yourKey2”, value2);
                    startActivity(intent);

                }
            });