在android中如何将数据从活动传递到回收器视图适配器

Question

谁能给我一个例子hoe把保存的数据从活动传递到回收器适配器。我知道如何使用putExtra等将数据从回收器适配器传递到活动。

好心帮帮我。百万先谢！

活动A中的代码（Add address按钮可用并且存在回收器视图）

public class ProfileManageAdressFragment extends AppCompatActivity {

    RecyclerView recyclerView;
    ProfileManageAddressRecyclerAdapter adapter;
    ArrayList<ProfileManageAddressGetterSetter> reviews;


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

        Button addAddress = findViewById(R.id.addNewAddress);
        reviews = new ArrayList<>();
        addAddress.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(v.getContext(), "Clicked", Toast.LENGTH_SHORT).show();
                Intent intent = new Intent(ProfileManageAdressFragment.this, AddNewAddress.class);
                startActivity(intent);
                
            }
        });
    }
}

reviews.add(new ProfileManageAddressGetterSetter("Customer Name", "address line 1", "address line 2"));
                recyclerView = findViewById(R.id.addressRecyclerView);
                recyclerView.setHasFixedSize(true);
                recyclerView.setLayoutManager(new LinearLayoutManager(ProfileManageAdressFragment.this));
                adapter = new ProfileManageAddressRecyclerAdapter(this, reviews);
                recyclerView.setAdapter(adapter);

public class ProfileManageAddressRecyclerAdapter extends RecyclerView.Adapter<ProfileManageAddressRecyclerAdapter.ViewHolder> {

    private ArrayList<ProfileManageAddressGetterSetter> mDataset = new ArrayList<>();
    private Context context;

    public static class ViewHolder extends RecyclerView.ViewHolder {
        private TextView customer_name, address_one, address_two;
        private Button edit, remove;

        public ViewHolder(View v) {
            super(v);
            customer_name = (TextView) v.findViewById(R.id.customerName);
            address_one = (TextView) v.findViewById(R.id.addressLineOne);
            address_two = v.findViewById(R.id.addressLineTwo);
            
        }
    }

    public ProfileManageAddressRecyclerAdapter(View.OnClickListener profileManageAdressFragment, ArrayList<ProfileManageAddressGetterSetter> dataset) {
        mDataset.clear();
        mDataset.addAll(dataset);
    }

    @Override
    public ProfileManageAddressRecyclerAdapter.ViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {

        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_manage_address, parent, false);
        ProfileManageAddressRecyclerAdapter.ViewHolder vh = new ProfileManageAddressRecyclerAdapter.ViewHolder(view);
        return vh;
    }

    @Override
    public void onBindViewHolder(@NonNull ProfileManageAddressRecyclerAdapter.ViewHolder holder, int position) {
        ProfileManageAddressGetterSetter profileManageAddressGetterSetter = mDataset.get(position);
        holder.address_one.setText(profileManageAddressGetterSetter.getAddress_line_1());
        holder.address_two.setText(profileManageAddressGetterSetter.getGetAddress_line_2());
        holder.customer_name.setText(profileManageAddressGetterSetter.getContractor_name());
    }


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

}

public class AddNewAddress extends AppCompatActivity {

    private EditText customer_name, address_one, address_two;
    private TextView cancel;
    private Button add_address;

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

        customer_name = findViewById(R.id.customerName);
        address_one = findViewById(R.id.addressOne);
        address_two = findViewById(R.id.addressTwo);
        add_address = findViewById(R.id.addAddress);
        cancel = findViewById(R.id.completeCancel);

        String cancel_text = "Cancel";

        SpannableString spanableObject = new SpannableString(cancel_text);
        ClickableSpan clickableSpan = new ClickableSpan() {
            @Override
            public void onClick(View widget) {
                Toast.makeText(AddNewAddress.this, "Clicked", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void updateDrawState(TextPaint ds) {
                super.updateDrawState(ds);
                ds.setColor(Color.BLUE);
            }
        };

        spanableObject.setSpan(clickableSpan, 0, 6, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        cancel.setText(spanableObject);

        cancel.setMovementMethod(LinkMovementMethod.getInstance());

        final ProfileManageAdressFragment profileManageAdressFragment = new ProfileManageAdressFragment();
        add_address.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(AddNewAddress.this, ProfileManageAdressFragment.class);
                startActivity(intent);
            }
        });
    }

    private void setFragment(android.support.v4.app.Fragment fragment) {
        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(R.id.main_frame, fragment).commit();
    }
}

请检查我更新的回收器适配器。当我运行时，0将显示在文本区域中，如所附图像所示。我对Android系统是新手。请以身作则。

Answer 1

我最终通过使用ActivityResult实现了我的目标。现在我能够将数据从Activity传递到CardView。

解决方案：当在活动A中单击button时，我使用startResultActivity（）启动活动。后来，当活动B i触发。最终用户输入数据，并使用putExtra（）传递数据，一旦在活动B中单击save按钮，接下来在活动B和finish（）中设置setResult（）。

最后，我在活动A中定义onActivityResult（）以获得结果。很好用！！