Question

我有一个ListView和每个项目有两张图片，并希望你点击其中一个我用zxing读取二维码。

我在调用方法startActivityForResult时遇到错误，并且不知道哪个方法可以替换它或者如何替换它。我留下一些代码： MY HOLDER CLASS

public class ObrasHolder {
    public ImageView foto;
    public TextView num, iden, ubi,hombres,material,equipo;
    public RelativeLayout fondo;
    public TextView eq1, eq2, eq3, eq4;
    public TextView g1,g2,g3,g4;
    public ImageView cam,qr;
}

MY CUSTOM ADAPTER：

public class ObrasAdapter extends ArrayAdapter<Obra> {
    public Context context;
    private ArrayList<Obra> datos;

    public void DisplayProjectListAdapter(Context c) {
        context = c;
    }

    public ObrasAdapter(Context context, ArrayList<Obra> datos) {
        super(context, R.layout.listview_item, datos);
        this.context = context;
        this.datos = datos;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View item = convertView;
        ObrasHolder holder;

        if (item == null) {
            item = LayoutInflater.from(context).inflate(R.layout.listview_item,
                    null);

            holder = new ObrasHolder();
            holder.foto = (ImageView) item.findViewById(R.id.imgAnimal);
            holder.num = (TextView) item.findViewById(R.id.numC);
            holder.iden = (TextView) item.findViewById(R.id.idenC);
            holder.ubi = (TextView) item.findViewById(R.id.ubiC);
            holder.hombres = (TextView) item.findViewById(R.id.homC);
            holder.material = (TextView) item.findViewById(R.id.matC);
            holder.eq1 = (TextView) item.findViewById(R.id.eq1);
            holder.eq2 = (TextView) item.findViewById(R.id.eq2);
            holder.eq3 = (TextView) item.findViewById(R.id.eq3);
            holder.eq4 = (TextView) item.findViewById(R.id.eq4);
            holder.g1 = (TextView) item.findViewById(R.id.g1);
            holder.g2 = (TextView) item.findViewById(R.id.g2);
            holder.g3 = (TextView) item.findViewById(R.id.g3);
            holder.g4 = (TextView) item.findViewById(R.id.g4);
            holder.fondo = (RelativeLayout) item.findViewById(R.id.fondobra);
            holder.cam = (ImageView) item.findViewById(R.id.cam);
            holder.qr = (ImageView) item.findViewById(R.id.qr);

            item.setTag(holder);
        }
        holder = (ObrasHolder) item.getTag();

        holder.qr.setOnClickListener(new OnClickListener() {           
            @Override
            public void onClick(View v) {

                Intent intent = new Intent("com.google.zxing.client.android.SCAN");
                intent.putExtra("SCAN_MODE", "QR_CODE_MODE");
                startActivityForResult(intent, 0);   //Error because is undefined for the type new View.OnClickListener(){}     
            }
         });

        return item;
    }

    public void onActivityResult(int requestCode, int resultCode, Intent intent) {
       if (requestCode == 0) {
          if (resultCode == RESULT_OK) {
             String contents = intent.getStringExtra("SCAN_RESULT");
             // Handle successful scan
          } else if (resultCode == RESULT_CANCELED) {
             // Handle cancel
          }
       }
    }

}

有什么想法解决它？

我也给了另一个错误。在methdod onActivityResult中。谢谢!!

Answer 1

尝试将此添加到持有适配器的活动：

public void onActivityResult(int requestCode, int resultCode, Intent intent) {
       if (requestCode == 0) {
          if (resultCode == RESULT_OK) {
             String contents = intent.getStringExtra("SCAN_RESULT");
             // Handle successful scan
          } else if (resultCode == RESULT_CANCELED) {
             // Handle cancel
          }
       }
    }

Answer 2

未定义因为，系统正在setOnClickListener上下文中查找方法。您应该为它提供全局上下文。你有上下文变量，但是你也应该尝试用Activity类型包装上下文。

((Activity)context).startActivityForResult(intent, 0);

这将为您做，但只需确保将上下文传递给构造函数时，使用this关键字将活动上下文传递给它。

在视图

2 个答案: