java - 如何从 RecycleAdapter 获取值并设置为 MainActivity Text？

Question

我的适配器代码如下:

    @Override
    public void onBindViewHolder(final ViewHolder holder, final int position) {
        GetSet getSet = allData.get(position);
        holder.tvId.setText(getSet.getId().toString());
        holder.tvName.setText(getSet.getName());

    public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{

        @BindView(R.id.tvId)
        TextView tvId;

        @BindView(R.id.tvName)
        TextView tvName;

我在 MainActivity 中有 textview，我的问题是如何获取要在 textview 中设置的值/文本 ID 和名称？

Answer 1

假设您在 Activity 中有标签，并且您想将更新后的字符串传递给 Activity。看下面的建议

适配器

//create an interface in adapter
public interface LabelChangeListener {
    void onLabelChanged(String text);
}

//create a method inside adapter
public void setLabelChangeListener(LabelChangeListener listener) {
    this.listener = listener;
}

//optional: create this method inside adapter
public void updateActivityLabel() {
    if (listener != null) {
        listener.onLabelChanged("this is update");
    }
}

Activity

//from activity 
adapter.setLabelChangeListener(new LabelChangeListener() {
    void onLabelChanged(String text) {
        lblYourTextView.setText(text);
    }
});