android - 从对话框更新 RecyclerView

Question

如何从另一个类中的对话框更新 recyclerview？

我的对话框作为一个单独的类从 mainActivity 中调用。当我在数据库中进行更改时，我想更新 mainActivity 上的 recyclerview。

对话框:

public class Dialog {

DatabaseExecutor databaseExecutor = new DatabaseExecutor();
private final Activity activity;
private final List<Passenger> passengers;
private final int position;

public Dialog (final Activity activity, final List<Passenger> passengers, final int position){
    this.activity = activity;
    this.passengers = passengers;
    this.position = position;
}

public void showDialog (){
    final BottomSheetDialog dialog = new BottomSheetDialog(activity);
    dialog.setContentView(R.layout.custom_dialog);

    final AppCompatImageView dial, message, info, paid, edit, delete;
    final AppCompatTextView name;

    name = dialog.findViewById(R.id.dialog_name);
    paid = dialog.findViewById(R.id.dialog_paid);

    name.setText(passengers.get(position).getName());
    if(passengers.get(position).isPaid())
        paid.setImageResource(R.drawable.money_paid_72);
    else
        paid.setImageResource(R.drawable.money_unpaid_72);

    paid.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Passenger passenger = passengers.get(position);
            if (!passengers.get(position).isPaid()){
                passenger.setPaid(true);
                passenger.setTumblr(R.drawable.money_paid);
                passenger.setUser(R.drawable.user_icon);
                paid.setImageResource(R.drawable.money_paid_72);
            }
            else {
                passenger.setPaid(false);
                passenger.setTumblr(R.drawable.money_unpaid);
                passenger.setUser(R.drawable.user_icon_unpaid);
                paid.setImageResource(R.drawable.money_unpaid_72);
            }
            databaseExecutor.updatePassenger(activity, passenger);
        }
    });
dialog.show();
}
}

附言当这个对话框在 mainActivity 中时，我只是调用了 populateData 方法并且它起作用了。但是如何从这个 Dialog 类中刷新它呢？

Answer 1

您可以在 MainActivity 的对话框中使用 callback，

public interface DialogCallback {
    public void onDialogCallback();
}

你的 Dialog 构造函数应该是，

DialogCallback callback;

public Dialog (final Activity activity, final List<Passenger> passengers, final int position, DialogCallback callback){
    this.activity = activity;
    this.passengers = passengers;
    this.position = position;
    this.callback = callback;
}

在您的对话框按钮中单击使用下面的代码，

paid.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Passenger passenger = passengers.get(position);
        if (!passengers.get(position).isPaid()){
            passenger.setPaid(true);
            passenger.setTumblr(R.drawable.money_paid);
            passenger.setUser(R.drawable.user_icon);
            paid.setImageResource(R.drawable.money_paid_72);
        }
        else {
            passenger.setPaid(false);
            passenger.setTumblr(R.drawable.money_unpaid);
            passenger.setUser(R.drawable.user_icon_unpaid);
            paid.setImageResource(R.drawable.money_unpaid_72);
        }
        databaseExecutor.updatePassenger(activity, passenger);
        callback.onDialogCallback(); // Add this line
    }
});

在您的 MainActivity 中使用以下代码，

Dialog dialog = new Dialog(this, passengers, position, new DialogCallback() {
    @Override
    public void onDialogCallback() {
        // Update recycler view code here
    }
});
dialog.showDialog();