Question

我正在使用RecyclerView.我尝试使用selector.xml文件更改项目中的背景颜色。

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/trains_vagon_selected_departure" android:state_pressed="true" />
    <item android:drawable="@drawable/trains_vagon_selected_departure" android:state_focused="true" />
    <item android:drawable="@drawable/trains_vagon_selected_white" />
</selector>

适配器代码：

public class TrainsAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    public ArrayList<Train> trains;
    public Context context;
    private LayoutInflater inflater;
    private String statusString = "";

    public TrainsAdapter(Context context, ArrayList<Train> trains, String statusString) {
        this.context = context;
        this.trains = trains;
        inflater = LayoutInflater.from(context);
        this.statusString = statusString;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = inflater.inflate(R.layout.trains_adapter_item, parent, false);
        GenericViewHolder holder = new GenericViewHolder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
        if (holder instanceof GenericViewHolder) {
            final GenericViewHolder genericViewHolder = (GenericViewHolder) holder;
            genericViewHolder.vagoncontainer.removeAllViews();
            Train train = trains.get(position);
            if (statusString.equals("departure"))
                genericViewHolder.statusImageView.setImageResource(R.mipmap.departure_icon);
            else
                genericViewHolder.statusImageView.setImageResource(R.mipmap.return_icon);
            ArrayList<Vagons> vagons = train.getVagons();
            for (int i = 0; i < vagons.size(); i++) {
                if (vagons.get(i).getEnable().equals("1")) {
                    LayoutInflater layoutInflater = LayoutInflater.from(context);
                    final LinearLayout vagonView = (LinearLayout) layoutInflater.inflate(R.layout.trains_vagon_child, null);
                    genericViewHolder.vagoncontainer.setBackgroundColor(Color.WHITE);
                    RelativeLayout relativeLayout = (RelativeLayout) vagonView.findViewById(R.id.selected_layout);

                    if (statusString.equals("departure"))
                        relativeLayout.setBackgroundResource(R.drawable.recyclerview_selected_departure);
                    else
                        relativeLayout.setBackgroundResource(R.drawable.recyclerview_selected_returned);

                    TextView vagonClassName = (TextView) vagonView.findViewById(R.id.vagon_class_name);
                    TextView vagonClassPrice = (TextView) vagonView.findViewById(R.id.vagon_class_price);
                    vagonClassName.setText(vagons.get(i).getName());
                    vagonClassPrice.setText(vagons.get(i).getAmount());

                    genericViewHolder.vagoncontainer.addView(vagonView);
                }
            }

            genericViewHolder.trainTime.setText(train.getDeparture());
        }
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

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

    public Train getItem(int position) {
        return trains.get(position);
    }

    @Override
    public int getItemViewType(int position) {
        return position;
    }

    public class GenericViewHolder extends RecyclerView.ViewHolder {
        public TextView trainTime;
        public LinearLayout vagoncontainer;
        private ImageView statusImageView;

        public GenericViewHolder(View view) {
            super(view);

            trainTime = (TextView) view.findViewById(R.id.train_time);
            statusImageView = (ImageView) view.findViewById(R.id.departure_next_img);

            vagoncontainer = (LinearLayout) view.findViewById(R.id.vagon_container);
        }
    }
}

我有两个问题。

1）当我在RecyclerView中运行第一个元素时也会自动选择。为什么？我该如何解决？

2）是否可以更改选择器xml文件中的文本颜色？我知道如何按位置更改简单的recyclerView的背景和文本颜色，但目前每个元素按位置都有一些数组，我添加了它的位置，我试图改变孩子的观点背景和文字颜色（请参阅我的代码。我的意思是vagonView视图）

谢谢大家。

Answer 1

由于在state_focus="true"上运行app，因此可能会选择它。

Answer 2

您如何知道第一个元素被选中？
只需使用某种颜色状态列表

android:textColor

RecyclerView更改所选项目背景和文本颜色

2 个答案: