android Spinner中0位置的选定项目

Question

我有一个问题，显示第一个项目选择在旋转器下拉菜单。当旋转器第一次初始化时，行被填充为“Nothing selected view”，当从下拉菜单中选择了某些内容时，旋转器视图被更改为下拉菜单中的选定值。它在任何情况下都有效，除了在初始化后选择第一个项的情况。我想说的是，旋转器行的值在下拉列表中写入选定项的值，除了0项。只有在之前选择了项目0>时，才会在旋转器中显示零项。如果在spinner初始化后选择0，则不会显示。

这使我得出了适配器以奇怪的方式工作的结论。当spinner初始化时，它将用default填充。之后，如果选择的项高于默认值，它将更改默认值，但如果默认值不是change，状态保持不变？换句话说，只有在选择的值与当前值不同的情况下，旋转器才会改变视图？另一个困扰我的问题是，在getView方法中，我得到了正确的值和正确的位置，但视图无论如何都不会改变。就像重写的东西，重写方法，如果值为0，则不会让视图改变。

碎片旋转器

spinnerHairColor.setAdapter(new CustomSpinnerAdapter(R.string.hair_color, 
    getContext(), R.layout.spinner_dropdown, values.getHair_color()));
spinnerHairColor.setFocusableInTouchMode(true);
spinnerHairColor.setOnFocusChangeListener(spinnerFocusListener);

适配器

public class CustomSpinnerAdapter extends ArrayAdapter<Values.ValuesProperty> implements SpinnerAdapter {

private Context context;
private List<Values.ValuesProperty> valuesProperty;
protected LayoutInflater layoutInflater;
private int unselectedText;
private boolean init = false;


public CustomSpinnerAdapter(int unselectedText, Context context, int nothingSelectedLayout, List<Values.ValuesProperty> valuesProperty) {
    super(context, nothingSelectedLayout, valuesProperty);

    this.unselectedText = unselectedText;
    this.valuesProperty = valuesProperty;
    layoutInflater = LayoutInflater.from(context);
    this.context=context;
    init = true;
}



 @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View row = layoutInflater.inflate(R.layout.spinner_dropdown, parent, false);
        TextView tv = (TextView) row.findViewById(R.id.spinnerNothingText);

        if (position == 0 && init) {
            return getNothingSelectedView(parent);
        }

        Values.ValuesProperty v = getItem(position);
        tv.setText(getContext().getText(unselectedText) + ": " + v.getName());
        return row;
    }



 @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent) {
        Values.ValuesProperty v = getItem(position);
        View row = layoutInflater.inflate(R.layout.item_spinner, parent, false);
        TextView tv = (TextView) row.findViewById(R.id.spinnerText);
        tv.setText(v.getName());
        return row;
    }

    protected View getNothingSelectedView(ViewGroup parent) 
    {
        View backView = layoutInflater.inflate(R.layout.spinner_dropdown, parent, false);
        TextView tv = (TextView) backView.findViewById(R.id.spinnerNothingText);
        tv.setText(getContext().getText(unselectedText));
        // to make sure if 0 is selected isnt inital 0
        init = false;
        return backView;
    }

}

Answer 1

我设法想出了一个解决办法。这是适用于旋转器的适配器，如果没有选择，则该旋转器可能具有默认值

public class CustomSpinnerAdapter extends ArrayAdapter<Values.ValuesProperty> implements SpinnerAdapter{

private Context context;
private List<Values.ValuesProperty> valuesProperty;
protected LayoutInflater layoutInflater;
private int unselectedText;
private boolean init = false;

    public CustomSpinnerAdapter(int unselectedText, Context context, int nothingSelectedLayout,
                            List<Values.ValuesProperty> valuesProperty) {
    super(context, nothingSelectedLayout, valuesProperty);

    this.unselectedText = unselectedText;
    this.valuesProperty = valuesProperty;
    layoutInflater = LayoutInflater.from(context);
    this.context = context;
    init = true;
    }


    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
    View row = layoutInflater.inflate(R.layout.spinner_dropdown, parent, false);
    TextView tv = (TextView) row.findViewById(R.id.spinnerNothingText);

    if (position == 0 && init) {
        init = false;
        tv.setText(getContext().getText(unselectedText));
        return row;
    }

    Values.ValuesProperty v = getItem(position);
    if (position == 0 && parent.hasFocus())
        notifyDataSetChanged();

    tv.setText(getContext().getText(unselectedText) + ": " + v.getName());
    return row;
}


    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent) {
    Values.ValuesProperty v = getItem(position);
    View rowDrop = layoutInflater.inflate(R.layout.item_spinner, parent, false);
    TextView tvDrop = (TextView) rowDrop.findViewById(R.id.spinnerText);
    tvDrop.setText(v.getName());
    return rowDrop;
    }
}