添加上/下箭头到Android numberpicker

问题描述

我做了一个numberpicker对话框。它看起来像在左侧的图像，但没有向上/向下箭头：

我如何添加它们？

下面是我的code：

 公共类NumberPickerFragment扩展DialogFragment
                            实现DialogInterface.OnClickListener {    保护最后弦乐CLS = this.getClass（）getSimpleName（）。    @覆盖
    公共对话框onCreateDialog（捆绑savedInstanceState）{
        // TODO：让这个更灵活
        NumberPicker NP =新NumberPicker（getActivity（））;
        np.setMaxValue（250）;
        np.setMinValue（100）;
        np.setValue（150）;
        np.setDescendantFocusability（NumberPicker.FOCUS_BLOCK_DESCENDANTS）;
        np.setWrapSelectorWheel（假）;        返回新AlertDialog.Builder（getActivity（））
            .setTitle（R.string.height）
            .setView（NP）
            .setPositiveButton（android.R.string.ok，这一点）
            。创建（）;
    }    @覆盖
    公共无效的onClick（DialogInterface对话，诠释whichButton）{
        // TODO：做一些与返回值
        Log.d（CLS，收到点击）;
    }
}
 

解决方案

在Android上，NumberPicker有两种口味 - 一个用上下键和其他与车轮的滚动实施。

根据您当前的主题，NumberPicker是psented用户$ P $。

来源：

另外，如果你看看NumberPicker源$ C ​​$ C，向上/向下ImageButtons才有效，如果NumberPicker布局，由您主题的样式定义等于默认R.layout.number_picker

I've made a numberpicker dialog. It looks like the image on the left, but without the up/down arrows:

How can I add them?

Here's my code:

public class NumberPickerFragment extends DialogFragment
                            implements DialogInterface.OnClickListener {

    protected final String CLS = this.getClass().getSimpleName();

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // TODO: Make this more flexible
        NumberPicker np = new NumberPicker(getActivity());
        np.setMaxValue(250);
        np.setMinValue(100);
        np.setValue(150);
        np.setDescendantFocusability(NumberPicker.FOCUS_BLOCK_DESCENDANTS);
        np.setWrapSelectorWheel(false);

        return new AlertDialog.Builder(getActivity())
            .setTitle(R.string.height)
            .setView(np)
            .setPositiveButton(android.R.string.ok, this)
            .create();
    }

    @Override
    public void onClick(DialogInterface dialog, int whichButton) {
        // TODO: Do something with the return value
        Log.d(CLS, "Received click");
    }
}

解决方案

In Android, NumberPicker has two flavours - One with up down button and other with wheel scroll implementation.

Depending on the your current theme, NumberPicker is presented to the user.

Source: http://developer.android.com/reference/android/widget/NumberPicker.html

Also, if you look into the source code of NumberPicker, up/down ImageButtons are only enabled if NumberPicker layout, as defined by your Theme's style is equal to default R.layout.number_picker

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