android - 如何在android cardview中创建弹出菜单

Question

我想在卡片 View 上创建带有编辑和删除选项的弹出菜单我已经尝试了下面的代码但是我在 popup.show(); 处强制关闭致命异常(exception) onclick的 imageview .我应该怎么做才能在 cardview 上创建弹出菜单？ ？

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

public static final String PRODUCTID = "PRODUCTID";
public static final String PRODUCTNAME = "PRODUCTNAME";

List<CustDatabaseModel> dbCustList;
static Context context;
public ImageView btndots;

ShipRecyclerAdapter(Context context, List<CustDatabaseModel> dbCustList ){
    this.dbCustList = new ArrayList<CustDatabaseModel>();
    this.context = context;
    this.dbCustList = dbCustList;

}

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

    View itemLayoutView = LayoutInflater.from(parent.getContext()).inflate(
            R.layout.address_list, null);

    // create ViewHolder

    ViewHolder viewHolder = new ViewHolder(itemLayoutView);
    return viewHolder;
}

@Override
public void onBindViewHolder(ShipRecyclerAdapter.ViewHolder holder, final int position) {

    holder.address.setText(dbCustList.get(position).getaddress());
    holder.city.setText(dbCustList.get(position).getcity());
    holder.state.setText(dbCustList.get(position).getstate());
    holder.zipcode.setText(dbCustList.get(position).getzip());

  final String adr=dbCustList.get(position).getaddress().toString();

    holder.btndots.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(final View v) {
            PopupMenu popup = new PopupMenu(context, btndots);
            //Inflating the Popup using xml file
            popup.getMenuInflater().inflate(R.menu.popup_menu, popup.getMenu());

            popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
                public boolean onMenuItemClick(MenuItem item) {
                    Intent i;
                    if ((item.getTitle().toString()).equalsIgnoreCase("Edit")) {
                        Toast.makeText(ShipRecyclerAdapter.context, "you have clicked Menu image ", Toast.LENGTH_LONG).show();

                    } else if ((item.getTitle().toString()).equalsIgnoreCase("Delete")) {
                        Toast.makeText(ShipRecyclerAdapter.context, "you have clicked Menu image ", Toast.LENGTH_LONG).show();
                    }
                    return true;
                }
            });

            popup.show();
        }
    });



    //closing the setOnClickListener method



}

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

public class ViewHolder extends RecyclerView.ViewHolder {

    public TextView state,address,city,zipcode;
    public ImageView btndots;



    public ViewHolder(View itemLayoutView) {
        super(itemLayoutView);
        address = (TextView) itemLayoutView.findViewById(R.id.textViewAddress);
        city = (TextView)itemLayoutView.findViewById(R.id.textViewCity);
        zipcode = (TextView)itemLayoutView.findViewById(R.id.textViewZipcode);
        state = (TextView)itemLayoutView.findViewById(R.id.textViewState);
        this.btndots = (ImageView)itemLayoutView.findViewById(R.id.cmenu);


    }



}

}`

Answer 1

首先像这样在菜单文件夹中创建xml文件，

 <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <item
        android:id="@+id/edit"
        android:title="@string/edit"
        app:showAsAction="ifRoom" />

    <item
        android:id="@+id/delete"
        android:title="@string/delete"
        app:showAsAction="ifRoom" />

</menu>

然后在你的适配器类中创建方法，

private void showPopup(View view, final int position) {
    // pass the imageview id
    View menuItemView = view.findViewById(R.id.btn_song_list_more);
    PopupMenu popup = new PopupMenu(activity, menuItemView);
    MenuInflater inflate = popup.getMenuInflater();
    inflate.inflate(R.menu.popup_menu, popup.getMenu());
    Log.e("position -- " + position);

    popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {

        @Override
        public boolean onMenuItemClick(MenuItem item) {
            switch (item.getItemId()) {
                case R.id.edit:
                  // do what you need.
                    break;
                case R.id.delete:
          // do what you need .
                    break;
                default:
                    return false;
            }
            return false;
        }
    });
    popup.show();
}

call this method of your imageview click event.