Android ArrayAdapter：如何从适配器中删除项目

在我的应用程序中，我有两个车辆列表：完整列表和我的收藏夹。在收藏夹中时，我会显示用户从该收藏夹中删除车辆的选项：

为了显示此自定义listview项，我实现了以下适配器：

public class VehicleAdapter extends ArrayAdapter<Vehicle> {


    private int listType=1;

    public Vehicle[] vehicles;

    public VehicleAdapter(@NonNull Context context, @LayoutRes int resource, @NonNull Vehicle[] objects, int listType) {
        super(context, resource, objects);
        this.listType = listType;
        this.vehicles = objects;
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {

        LayoutInflater layoutInflater = LayoutInflater.from(getContext());
        View customView = layoutInflater.inflate(R.layout.vehicle_row, null);

        Vehicle vehicle = getItem(position);

        ImageView imgVehicle = (ImageView) customView.findViewById(R.id.imgVehicle);
        TextView txtTitle = (TextView) customView.findViewById(R.id.txtTitle);
        TextView txtDescription = (TextView) customView.findViewById(R.id.txtDescription);

        txtTitle.setText(vehicle.name);
        txtDescription.setText(vehicle.short_description);
        Picasso.with(getContext()).load(vehicle.picture).into(imgVehicle);

        // If it's the favorites list
        if(listType == 2) {
            Button btnDelete = (Button) customView.findViewById(R.id.btnDelete);
            btnDelete.setVisibility(View.VISIBLE);

            final int itemPosition = position;
            btnDelete.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {

                    Vehicle item = VehicleAdapter.this.vehicles[itemPosition];
                    remove(item); // HERE: throws fatal error
                    notifyDataSetChanged();
                }
            });
        }

        return customView;
    }
}

我的问题是：我不确定我是否使用了删除按钮的正确方法。如您所见，我在adapter类中向其添加了一个侦听器。我可以得到正确的项目，但当我试图删除它抛出一个致命的错误。我相信我使用了错误的方法，但我不知道如何做这个删除选项

---

感谢您提供的帮助

如果我们以数组形式发送，则无法在ArrayAdapter中修改它，而不是发送，请选择Verhicle[]以ArrayList形式发送

public class VehicleAdapter extends ArrayAdapter<Vehicle> {

    private int listType=1;

    public ArrayList<Vehicle> vehicles;

    public VehicleAdapter(@NonNull Context context, @LayoutRes int resource, @NonNull ArrayList<Vehicle> objects, int listType) {
        super(context, resource, objects);
        this.listType = listType;
        this.vehicles = objects;
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {

        LayoutInflater layoutInflater = LayoutInflater.from(getContext());
        View customView = layoutInflater.inflate(R.layout.vehicle_row, null);

        final Vehicle vehicle = getItem(position);

        ImageView imgVehicle = (ImageView) customView.findViewById(R.id.imgVehicle);
        TextView txtTitle = (TextView) customView.findViewById(R.id.txtTitle);
        TextView txtDescription = (TextView) customView.findViewById(R.id.txtDescription);

        txtTitle.setText(vehicle.name);
        txtDescription.setText(vehicle.short_description);
        Picasso.with(getContext()).load(vehicle.picture).into(imgVehicle);

        // If it's the favorites list
        if(listType == 2) {
            Button btnDelete = (Button) customView.findViewById(R.id.btnDelete);
            btnDelete.setVisibility(View.VISIBLE);

            btnDelete.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    remove(vehicle);
                    notifyDataSetChanged();
                }
            });
        }

        return customView;
    }
}

public class VehicleAdapter扩展阵列适配器{
私有int-listType=1；
公共列表车辆；
公共车辆导航器（@NonNull上下文上下文、@LayoutRes int-resource、@NonNull ArrayList对象、int-listType）{
超级（上下文、资源、对象）；
this.listType=listType；
这意味着车辆=物体；
}
@非空
@凌驾
公共视图getView（int位置，@Nullable视图convertView，@NonNull视图组父级）{
LayoutInflater LayoutInflater=LayoutInflater.from（getContext（））；
视图customView=布局更平坦。充气（R.layout.vehicle\u row，空）；
最终车辆=获取项目（位置）；
ImageView imgVehicle=（ImageView）customView.findViewById（R.id.imgVehicle）；
TextView txtTitle=（TextView）customView.findViewById（R.id.txtTitle）；
TextView txtDescription=（TextView）customView.findViewById（R.id.txtDescription）；
txtTitle.setText（车辆名称）；
txtDescription.setText（车辆简短描述）；
毕加索.with（getContext（））.load（vehicle.picture）.into（imgVehicle）；
//如果是收藏夹列表
如果（listType==2）{
按钮btnDelete=（按钮）customView.findViewById（R.id.btnDelete）；
btnDelete.setVisibility（View.VISIBLE）；
btnDelete.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图）{
移走（车辆）；
notifyDataSetChanged（）；
}
});
}
返回自定义视图；
}
}

不是发送，而是Verhicle[]作为ArrayList发送，如果我们作为数组发送，则无法在ArrayAdapter中修改它

public class VehicleAdapter extends ArrayAdapter<Vehicle> {

    private int listType=1;

    public ArrayList<Vehicle> vehicles;

    public VehicleAdapter(@NonNull Context context, @LayoutRes int resource, @NonNull ArrayList<Vehicle> objects, int listType) {
        super(context, resource, objects);
        this.listType = listType;
        this.vehicles = objects;
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {

        LayoutInflater layoutInflater = LayoutInflater.from(getContext());
        View customView = layoutInflater.inflate(R.layout.vehicle_row, null);

        final Vehicle vehicle = getItem(position);

        ImageView imgVehicle = (ImageView) customView.findViewById(R.id.imgVehicle);
        TextView txtTitle = (TextView) customView.findViewById(R.id.txtTitle);
        TextView txtDescription = (TextView) customView.findViewById(R.id.txtDescription);

        txtTitle.setText(vehicle.name);
        txtDescription.setText(vehicle.short_description);
        Picasso.with(getContext()).load(vehicle.picture).into(imgVehicle);

        // If it's the favorites list
        if(listType == 2) {
            Button btnDelete = (Button) customView.findViewById(R.id.btnDelete);
            btnDelete.setVisibility(View.VISIBLE);

            btnDelete.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    remove(vehicle);
                    notifyDataSetChanged();
                }
            });
        }

        return customView;
    }
}

public class VehicleAdapter扩展阵列适配器{
私有int-listType=1；
公共列表车辆；
公共车辆导航器（@NonNull上下文上下文、@LayoutRes int-resource、@NonNull ArrayList对象、int-listType）{
超级（上下文、资源、对象）；
this.listType=listType；
这意味着车辆=物体；
}
@非空
@凌驾
公共视图getView（int位置，@Nullable视图convertView，@NonNull视图组父级）{
LayoutInflater LayoutInflater=LayoutInflater.from（getContext（））；
视图customView=布局更平坦。充气（R.layout.vehicle\u row，空）；
最终车辆=获取项目（位置）；
ImageView imgVehicle=（ImageView）customView.findViewById（R.id.imgVehicle）；
TextView txtTitle=（TextView）customView.findViewById（R.id.txtTitle）；
TextView txtDescription=（TextView）customView.findViewById（R.id.txtDescription）；
txtTitle.setText（车辆名称）；
txtDescription.setText（车辆简短描述）；
毕加索.with（getContext（））.load（vehicle.picture）.into（imgVehicle）；
//如果是收藏夹列表
如果（listType==2）{
按钮btnDelete=（按钮）customView.findViewById（R.id.btnDelete）；
btnDelete.setVisibility（View.VISIBLE）；
btnDelete.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图）{
移走（车辆）；
notifyDataSetChanged（）；
}
});
}
返回自定义视图；
}
}

请同时发布logcat错误和你的remove（）方法。如果你在你的应用程序中展示了实例化适配器的几行代码，这将非常有用。这个问题可能与适配器的实例化方式有关，当您试图修改实例化适配器的实时内容时，会在运行时出现异常。@Livio我刚才在问题中添加了一个问题，您应该更改代码，因为无法修改Vehicle[]项，所以您应该使用类似ArrayList项的内容，这是可修改的，不会生成问题所在的ExceptionTanks@Livio。还请发布logcat错误和您的remove（）方法。如果您在应用程序中显示实例化适配器的几行代码，这将非常有用。这个问题可能与适配器的实例化方式有关，当您试图修改实例化适配器的实时内容时，会在运行时出现异常。@Livio我刚才在问题中添加了一个问题，您应该更改代码，因为无法修改Vehicle[]项，所以您应该使用类似ArrayList项的内容，这是可修改的，不会生成问题所在的ExceptionTanks@Livio。感谢您的回答。它给了我同样的错误：class java.lang.UnsupportedOperationException更新了我的答案，看一看。就是这样。ArrayList是对象的正确类型。谢谢你的回答。它给了我同样的错误：class java.lang.UnsupportedOperationException更新了我的答案，看一看。就是这样。ArrayList是对象的正确类型。谢谢

public class VehicleAdapter extends ArrayAdapter<Vehicle> {

    private int listType=1;

    public ArrayList<Vehicle> vehicles;

    public VehicleAdapter(@NonNull Context context, @LayoutRes int resource, @NonNull ArrayList<Vehicle> objects, int listType) {
        super(context, resource, objects);
        this.listType = listType;
        this.vehicles = objects;
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {

        LayoutInflater layoutInflater = LayoutInflater.from(getContext());
        View customView = layoutInflater.inflate(R.layout.vehicle_row, null);

        final Vehicle vehicle = getItem(position);

        ImageView imgVehicle = (ImageView) customView.findViewById(R.id.imgVehicle);
        TextView txtTitle = (TextView) customView.findViewById(R.id.txtTitle);
        TextView txtDescription = (TextView) customView.findViewById(R.id.txtDescription);

        txtTitle.setText(vehicle.name);
        txtDescription.setText(vehicle.short_description);
        Picasso.with(getContext()).load(vehicle.picture).into(imgVehicle);

        // If it's the favorites list
        if(listType == 2) {
            Button btnDelete = (Button) customView.findViewById(R.id.btnDelete);
            btnDelete.setVisibility(View.VISIBLE);

            btnDelete.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    remove(vehicle);
                    notifyDataSetChanged();
                }
            });
        }

        return customView;
    }
}