Question

我的RecyclerView单行有3列。 2是从SQLite数据库查询中填充的，另一个是由TextView填充的。我在如何填充TextView方面遇到麻烦。目的是通过从一组switch语句中选择的Strings选项来设置TextView。但是，findViewById无法解析。是否可以在TextView内使用onBindViewHolder？

RecyclerViewAdapter.java

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

private Cursor mCursor;


public UpcomingRecyclerViewAdapter(Cursor cursor) {
    this.mCursor = cursor;
}

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

    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.history_list_items, parent, false);
    return new UpcomingRecyclerViewAdapter.ViewHolder(view);
}

@Override
public void onBindViewHolder(UpcomingRecyclerViewAdapter.ViewHolder holder, int position) {
    if ((mCursor != null) && (mCursor.getCount() != 0)) {
        if (!mCursor.moveToPosition(position)) {
            throw new IllegalStateException("Couldn't move cursor to position " + position);
        }
        String name = mCursor.getString(mCursor.getColumnIndex(VehiclesContract.Columns.VEHICLE_NAME));
        String miles = mCursor.getString(mCursor.getColumnIndex(VehiclesContract.Columns.VEHICLE_CURRENT));
        String maintenance = (TextView) view.findViewById(R.id.up_list_maintenance);

        holder.name.setText(name);
        holder.miles.setText(miles);
        holder.maintenance.setText(maintenance);
    }
}


@Override
public int getItemCount() {
    return mCursor != null ? mCursor.getCount() : 0;
}


static class ViewHolder extends RecyclerView.ViewHolder {
    TextView name;
    TextView miles;
    TextView maintenance;

    public ViewHolder(View itemView) {
        super(itemView);
        this.name = itemView.findViewById(R.id.upcoming_name);
        this.miles = itemView.findViewById(R.id.upcoming_miles);
        this.maintenance = itemView.findViewById(R.id.upcoming_maintenance);
    }
}

Answer 1

好吧，在这一行

String maintenance = (TextView) view.findViewById(R.id.up_list_maintenance);

您正在尝试分配一个视图到字符串，这是完全错误的。

您可以assign the value of a textfield which is a string to a string variable，

或assign a textfield to a variable of textfield type.

首先解决此问题，然后查看它是否可以解决您的问题。

Answer 2

String maintenance = (TextView) view.findViewById(R.id.up_list_maintenance);

findViewById返回一个View。您正在尝试将其转换为字符串。试试这个：

String maintenance = ((TextView) view.findViewById(R.id.up_list_maintenance)).getText().toString();

具有TextView的RecyclerView适配器

2 个答案: