单击与 Firebase 链接的 RecyclerView 中的记录时如何打开另一个 activity

Question

我制作了一个从 Android 应用程序获取数据并将其存储到 Firebase 的应用程序，我制作了 activity，其中包括显示数据的 RecyclerView，但问题是当我单击 RecyclerView 中的任何记录，我想打开另一个包含与按下的相同数据的屏幕，我尝试下面提到的代码，但是当你按下 RecyclerView 时，应用程序停止（我认为问题出在点击记录时传输数据的过程）请帮我解决问题

class代码

public class EMP_INFO implements Serializable {
    private String Id;
    private String Name;
    private String City;

    public EMP_INFO() {
    }

    public String getEmployeeID() {
        return Id;
    }
    public void setEmployeeID(String ID) {
        this.Id = ID;
    }

    public String getEmployeeName() {
        return Name;
    }
    public void setEmployeeName(String Name) {
        this.Name = Name;
    }

    public String getEmployeeCity() {
        return City;
    }

    public void setEmployeeCity(String City) {
        this.City = City;
    }
}

适配器代码

public class EMP_INFO_Adapter extends FirebaseRecyclerAdapter<EMP_INFO, EMP_INFO_Adapter.personsViewholder> {

    public EMP_INFO_Adapter(@NonNull FirebaseRecyclerOptions<EMP_INFO> options)
    {
        super(options);
    }

    @Override
    protected void
    onBindViewHolder(@NonNull personsViewholder holder, int position, @NonNull EMP_INFO model)
    {
        holder.F_ID.setText(model.getEmployeeID());
        holder.F_name.setText(model.getEmployeeName());
        holder.F_city.setText(model.getEmployeeCity());

        Intent intent = new Intent(context, FireBase_Save_data_1.class);

        intent.putExtra("FB_id1", String.valueOf(model.getEmployeeID()));
        intent.putExtra("FB_name1", String.valueOf(model.getEmployeeName()));
        intent.putExtra("FB_city1", String.valueOf(model.getEmployeeCity()));

        activity.startActivityForResult(intent, 1);
    }

    @NonNull
    @Override
    public personsViewholder
    onCreateViewHolder(@NonNull ViewGroup parent, int viewType)
    {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.fire_base_my_row, parent, false);
        return new EMP_INFO_Adapter.personsViewholder(view);
    }

    class personsViewholder extends RecyclerView.ViewHolder { TextView F_ID, F_name, F_city;
        public personsViewholder(@NonNull View itemView)
        {
            super(itemView);

            F_ID = itemView.findViewById(R.id.F_ID);
            F_name = itemView.findViewById(R.id.F_name);
            F_city = itemView.findViewById(R.id.F_city);
        }
    }
}

RecyclerViewactivity代码

public class FireBase_Recyclerview_2 extends AppCompatActivity {

    private RecyclerView recyclerView;
    Button add_button;
    EMP_INFO_Adapter adapter;
    //EMP_INFO_Adapter_3 adapter;
    DatabaseReference mbase;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fire_base_recyclerview_2);

        add_button = findViewById(R.id.add_button);
        recyclerView = findViewById(R.id.recycler1);
        // To display the Recycler view linearly
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        mbase = FirebaseDatabase.getInstance().getReference("EmployeeInfo") ;
        FirebaseRecyclerOptions<EMP_INFO> options = new FirebaseRecyclerOptions.Builder<EMP_INFO>()
                .setQuery(mbase, EMP_INFO.class).build();

        adapter = new EMP_INFO_Adapter(options);
        //adapter = new EMP_INFO_Adapter_3(options);
        recyclerView.setAdapter(adapter);

        add_button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(FireBase_Recyclerview_2.this, FireBase_Save_data_1.class);
                startActivity(intent);
            }
        });
    }

    @Override protected void onStart()
    {
        super.onStart();
        adapter.startListening();
    }

    @Override protected void onStop()
    {
        super.onStop();
        adapter.stopListening();
    }
}

Answer 1

您无法在 onBinViewHolder.move 内启动 activity 该代码到 viewholder class。

public class EMP_INFO_Adapter extends FirebaseRecyclerAdapter<EMP_INFO, EMP_INFO_Adapter.personsViewholder> {

    public EMP_INFO_Adapter(@NonNull FirebaseRecyclerOptions<EMP_INFO> options)
    {
        super(options);
    }

    @Override
    protected void
    onBindViewHolder(@NonNull personsViewholder holder, int position, @NonNull EMP_INFO model)
    {
        holder.F_ID.setText(model.getEmployeeID());
        holder.F_name.setText(model.getEmployeeName());
        holder.F_city.setText(model.getEmployeeCity());

      
    }

    @NonNull
    @Override
    public personsViewholder
    onCreateViewHolder(@NonNull ViewGroup parent, int viewType)
    {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.fire_base_my_row, parent, false);
        return new EMP_INFO_Adapter.personsViewholder(view);
    }

    class personsViewholder extends RecyclerView.ViewHolder implements View.OnClickListener
         TextView F_ID, F_name, F_city;
        public personsViewholder(@NonNull View itemView)
        {
            super(itemView);

            F_ID = itemView.findViewById(R.id.F_ID);
            F_name = itemView.findViewById(R.id.F_name);
            F_city = itemView.findViewById(R.id.F_city);
            itemView.setOnClickListener(this);
            

        }

 @Override
        public void onClick(View view) {
        
              int id=getAdapterPosition();
        Intent intent = new Intent(context, FireBase_Save_data_1.class);

        intent.putExtra("FB_id1", String.valueOf(model.get(id).getEmployeeID()));
        intent.putExtra("FB_name1", String.valueOf(model.get(id).getEmployeeName()));
        intent.putExtra("FB_city1", String.valueOf(model.get(id).getEmployeeCity()));

        activity.startActivityForResult(intent, 1);
            }
    }
           
        }
    }
}

Answer 2

您可以在适配器 onBindViewHolder 内的项目上放置一个点击监听器，如下所示。

holder.itemView.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
       Context context = v.getContext();
       Intent intent = new Intent(context, FireBase_Save_data_1.class);
       intent.putExtra("empId", model.getEmployeeID());
       intent.putExtra("empName", model.getEmployeeName());
       intent.putExtra("empCity", model.getEmployeeCity());
       context.startActivity(intent);
   }
});

单击与 Firebase 链接的 RecyclerView 中的记录时如何打开另一个 activity

How to open anothor activity when click on record in RecyclerView linked with Firebase

android

android-layout

firebase

android-recyclerview

firebase-realtime-database