项目的Andr​​oid NumberPicker组数字环绕项目 [英] Android NumberPicker set number of items to wrap items around

问题描述

我是想设定小时和分钟的 TimePicker ，我发现，它似乎有在 NumberPicker 的值环绕。

I was trying to set the hour and minute in the TimePicker and I found that it seems that there is a minimum number of items required in the NumberPicker for the values to wrap around.

如何设置的项目数比，如果我没有那么多值默认较小（只拿到了4：00，15，30和45）？

How do i set the number of items to lesser than the default if i don't have so many values (got only 4: "00", "15", "30" and "45")?

下面的图像显示小时，正确的，但纪要错误的。我需要的分钟数（00之前，即45），以环绕像小时。

The image below shows the hours as correct but the minutes as wrong. I need the minutes to wrap around (i.e. "45" before "00") like the hours.

下面是我的code：

@SuppressLint("NewApi")
private void setTimePickerInterval(TimePicker timePicker) {
    try {
        Class<?> classForid = Class.forName("com.android.internal.R$id");

        Field fieldHr = classForid.getField("hour");
        mHourPicker = (NumberPicker) timePicker.findViewById(fieldHr.getInt(null));

        //set hours from 9am to 7pm (opening hours)
        mHourPicker.setMinValue(0);
        mHourPicker.setMaxValue(10);
        mDisplayedValuesHr = new ArrayList<String>();

        for (int i = 9; i < 20; i++) {
            mDisplayedValuesHr.add(String.format("%02d", i));
        }

        mHourPicker.setDisplayedValues(mDisplayedValuesHr.toArray(new String[0]));

        Field fieldMin = classForid.getField("minute");
        mMinutePicker = (NumberPicker) timePicker.findViewById(fieldMin.getInt(null));

        //set minutes in 15 mins interval
        mMinutePicker.setMinValue(0);
        mMinutePicker.setMaxValue(3);
        mDisplayedValuesMin = new ArrayList<String>();

        for (int i = 0; i < 60; i += TIME_PICKER_INTERVAL) {
            mDisplayedValuesMin.add(String.format("%02d", i));
        }

        mMinutePicker.setDisplayedValues(mDisplayedValuesMin.toArray(new String[0]));

    } catch (Exception e) {
        e.printStackTrace();
    }
}

感谢

推荐答案

您可以显式调用<一个href=\"http://developer.android.com/reference/android/widget/NumberPicker.html#setWrapSelectorWheel(boolean)\"相对=nofollow> setWrapSelectorWheel（布尔）触发 updateWrapSelectorWheel NumberPicker ：

You can explicitly call setWrapSelectorWheel (boolean) to trigger the private method updateWrapSelectorWheel of NumberPicker:

@SuppressLint("NewApi")
private void setTimePickerInterval(TimePicker timePicker) {
    try {
        Class<?> classForid = Class.forName("com.android.internal.R$id");

        Field fieldHr = classForid.getField("hour");
        mHourPicker = (NumberPicker) timePicker.findViewById(fieldHr.getInt(null));

        //set hours from 9am to 7pm (opening hours)
        mHourPicker.setMinValue(0);
        mHourPicker.setMaxValue(10);
        mDisplayedValuesHr = new ArrayList<String>();

        for (int i = 9; i < 20; i++) {
            mDisplayedValuesHr.add(String.format("%02d", i));
        }

        mHourPicker.setDisplayedValues(mDisplayedValuesHr.toArray(new String[0]));

        Field fieldMin = classForid.getField("minute");
        mMinutePicker = (NumberPicker) timePicker.findViewById(fieldMin.getInt(null));

        //set minutes in 15 mins interval
        mMinutePicker.setMinValue(0);
        mMinutePicker.setMaxValue(3);
        mDisplayedValuesMin = new ArrayList<String>();

        for (int i = 0; i < 60; i += TIME_PICKER_INTERVAL) {
            mDisplayedValuesMin.add(String.format("%02d", i));
        }

        mMinutePicker.setDisplayedValues(mDisplayedValuesMin.toArray(new String[0]));
        mMinutePicker.setWrapSelectorWheel(true);

    } catch (Exception e) {
        e.printStackTrace();
    }
}

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