使用 recyclerview 位置将字体从正常更改为粗体

Question

我正在处理我的 java 代码，因为我想在单击主活动工具栏中的未读按钮时将字体从正常更改为粗体。

当我尝试这个时：

public void Unread(int position) {

    notifyItemChanged(position);
}

它不会在适配器的回收视图中将字体从正常更改为粗体。

这是适配器的代码：

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

    public InboxAdapter adapter;
    public Fragment _fragment;
    public RecyclerView recyclerView;


    @Override
    public void onBindViewHolder(ViewHolder holder, final int position) {
        // change the font style depending on message read status
        applyReadStatus(holder, inbox);

        holder.actionView.setOnClickListener(new View.OnClickListener() {
            @RequiresApi(api = Build.VERSION_CODES.N)
            @Override
            public void onClick(View v) {
                /*GradientDrawable gd = new GradientDrawable();
                gd.setColor(Color.parseColor("#e8f0fd"));
                gd.setCornerRadius(40);
                gd.setStroke(40, Color.parseColor("#e8f0fd"));
                holder.layout1.setBackgroundColor(Color.parseColor("#e8f0fd"));
                holder.layout1.setBackgroundDrawable(gd);*/
                int idx = holder.getAdapterPosition();
                String id = mInboxes.get(idx).getId();

                String short_name = holder.tvIcon.getText().toString();
                String subject1 = mInboxes.get(idx).getSubject();
                String from = mInboxes.get(idx).getFrom();
                String from_email = mInboxes.get(idx).getEmail();
                String datetime = mInboxes.get(idx).getDate();
                String isRead = mInboxes.get(idx).getRead();
                String isImportant = mInboxes.get(idx).isImportant();

                // set the read status
                setReadStatus(holder, isRead);

                openEmailActivity(mailbox, id, idx, color, short_name, subject1, from, from_email, datetime, isImportant);
               /* gd.setColor(Color.parseColor("#FFFFFF"));
                gd.setCornerRadius(40);
                gd.setStroke(40, Color.parseColor("#FFFFFF"));
                holder.layout1.setBackgroundColor(Color.parseColor("#FFFFFF"));
                holder.layout1.setBackgroundDrawable(gd);*/
            }
        });
    }


    public void applyReadStatus(ViewHolder holder, inbox inbox) {
        if (inbox.getRead().equals("read")) {
            holder.from.setTypeface(null, Typeface.NORMAL);
            holder.subject.setTypeface(null, Typeface.NORMAL);
            holder.from.setTextColor(ContextCompat.getColor(mContext, R.color.subject));
            holder.subject.setTextColor(ContextCompat.getColor(mContext, R.color.message));
            holder.time.setTextColor(ContextCompat.getColor(mContext, R.color.timestamp));
            holder.time.setTypeface(null, Typeface.NORMAL);
        } else {
            holder.from.setTypeface(null, Typeface.BOLD);
            holder.subject.setTypeface(null, Typeface.BOLD);
            holder.from.setTextColor(ContextCompat.getColor(mContext, R.color.from));
            holder.subject.setTextColor(ContextCompat.getColor(mContext, R.color.subject));
            holder.time.setTextColor(ContextCompat.getColor(mContext, R.color.timestamp));
            holder.time.setTypeface(null, Typeface.BOLD);
        }
    }


    public void Unread(int position) {

        notifyItemChanged(position);
    }


public void openEmailActivity(String mailbox, String id, int idx, int color, String short_name, String subject1, String from, String from_email, String datetime, String isImportant) {
        Intent intent = new Intent(mContext, MainActivity5.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
        intent.putExtra("mailbox", mailbox);
        intent.putExtra("id", id);
        intent.putExtra("idx", idx);
        intent.putExtra("bg_color", color);
        intent.putExtra("short_name", short_name);
        intent.putExtra("subject", subject1);
        intent.putExtra("from_sender", from);
        intent.putExtra("from_email", from_email);
        intent.putExtra("datetime", datetime);
        intent.putExtra("is_important", isImportant);
        _fragment.startActivityForResult(intent, MainActivity2.REQ_EMAIL_OPEN);
    }
}

这是 InboxFragment 的代码：

public class InboxFragment extends Fragment {

    public static final int REQ_EMAIL_OPEN = 3456;
    private RecyclerView mRecyclerView;
    private SwipeRefreshLayout mSwipeLayout;
    private InboxAdapter mInboxAdapter;
    private List<inbox> mInbox = new ArrayList<>();
    private inbox Inbox;
    private Call<List<inbox>> call;
    private Window window;
    private Toolbar toolbar;
    private FloatingActionButton fab;
    private FloatingActionButton fab1;
    private String contacts = null;
    private String mailbox = null;


    public View onCreateView(@NonNull LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {

        View root = inflater.inflate(R.layout.fragment_inbox, container, false);
        mRecyclerView = (RecyclerView) root.findViewById(R.id.recyclerView);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if(requestCode == REQ_EMAIL_OPEN){
            if(resultCode == Activity.RESULT_OK && data!= null){
                boolean isEmailDeleted = data.getBooleanExtra("isEmailDeleted",false);
                boolean isEmailUnread = data.getBooleanExtra("isEmailUnread",false);
                boolean isEmailRead = data.getBooleanExtra("isEmailRead",false);
                int emailId = data.getIntExtra("emailId",-1);

                if (isEmailDeleted && emailId != -1) {
                    mInboxAdapter.removeItem(emailId);
                }
                else if (isEmailUnread && emailId != -1) {
                    mInboxAdapter.Unread(emailId);
                }
                else if (isEmailRead && emailId != -1) {

                }
            }
        }
    }
}

你能告诉我一个例子，我如何将 from、subject 和 time 的这些文本视图的字体从普通字体更改为粗体？？

Answer 1

在这种情况下，您正在控制文本样式，inbox.getRead().equals("read")，但您实际上并没有更改收件箱对象中 read 值的值。

你应该做的是，你应该改变inbox对象在特定位置的read属性的值，然后调用notifyItemChanged(position);。

你应该这样做，

public void Unread(int position) {
    this.list.get(position).setRead("unread");
    notifyItemChanged(position);
}

这应该会更改您的 inbox 对象中的 read，并且应该对您有用。

使用 recyclerview 位置将字体从正常更改为粗体

Change the font from normal to bold using recyclerview position

java

android

android-adapter

android-studio

android-recyclerview