RecyclerView 崩溃

Question

我是 Android 和一般编程的新手。我正在尝试用一些数据加载 RecyclerView。在调试模式下，直到最后，应用程序崩溃时，它才会显示错误。这里使用的主要数据是一个名为 Lettura 的实体，它是房间数据库的一部分。在这里，我调用并使用一些数据填充视图：    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.vedi_letture_simple);        ArrayList<Lettura> letture = new ArrayList<>();        Date date = new Date(1989, 1, 1);        Lettura a = new Lettura("a", "b", "c", 14.5, date, 1);        letture.add(a);        RecyclerView recView = (RecyclerView) findViewById(R.id.lettura_recyclerview);        LetturaAdapter mlAdapter = new LetturaAdapter(this, letture);  //made final        recView.setAdapter(mlAdapter);        // use a linear layout manager      LinearLayoutManagr lll = new LinearLayoutManager(this);        recView.setLayoutManager(lll);这里是适配器类 LetturaAdapter.class    class LetturaAdapter extends RecyclerView.Adapter<LetturaAdapter.LetturaViewHolder> {    private ArrayList<Lettura> letture;      private LayoutInflater mInflater;    public LetturaAdapter(Context context, ArrayList<Lettura> lettura){        this.mInflater = LayoutInflater.from(context);        this.letture = lettura;    }    @Override    public void onBindViewHolder(LetturaViewHolder rigaHolded, int position) {        Lettura current;        current = letture.get(position);        TextView barT = hholded.barcodeItemView;        barT.setText(current.getBarcode());        TextView desT = hholded.descriptionItemView;        desT.setText(current.getDescription());        TextView priceT = hholded.priceItemView;        priceT.setText(current.getPrice().toString());        TextView dateT = hholded.dateItemView;        dateT.setText(current.getDate().toString());        TextView quanT = hholded.quantityItemView;        quanT.setText(current.getQuantity());    }

Answer 1

我想错误在这里：

TextView quanT = hholded.quantityItemView;
quanT.setText(current.getQuantity());

current.getQuantity()返回 aInteger而不是 a String。也许，你可以试试：

TextView quanT = hholded.quantityItemView;
quanT.setText(current.getQuantity().toString());

Answer 2

尝试这样做——在onBindViewHolder中 替换——

quanT.setText(current.getQuantity());

和

quanT.setText(current.getQuantity()+"");

setText() 方法只接受字符串值，数量是整数值..所以这里可能会崩溃..

Answer 3

代替

quanT.setText(current.getQuantity());

和

quanT.setText(String.valueOf(current.getQuantity()));

setText()仅适用于字符串。