How do i change the Android TimePicker minute inte

问题:

I am writing an application where the user needs to specify a given point in time, but i can't seem to figure out how to set the minute values that the user can choose from, to only use increments of 5 instead of increments of 1.

Simply put, when the user scrolls through the available amounts, he/she must only see 0,5,10,15 etc.

Thank you in advance.

回答1:

To ensure you're compatible with API 21+, make sure your TimePicker has the following attribute:

android:timePickerMode="spinner"

Then here's how you can set an interval programmatically. This method falls back on the standard TimePicker if the minute field cannot be found:

private static final int INTERVAL = 5;
private static final DecimalFormat FORMATTER = new DecimalFormat("00");

private TimePicker picker; // set in onCreate
private NumberPicker minutePicker;

public void setMinutePicker() {
    int numValues = 60 / INTERVAL;
    String[] displayedValues = new String[numValues];
    for (int i = 0; i < numValues; i++) {
        displayedValues[i] = FORMATTER.format(i * INTERVAL);
    }

    View minute = picker.findViewById(Resources.getSystem().getIdentifier("minute", "id", "android"));
    if ((minute != null) && (minute instanceof NumberPicker)) {
        minutePicker = (NumberPicker) minute;
        minutePicker.setMinValue(0);
        minutePicker.setMaxValue(numValues - 1);
        minutePicker.setDisplayedValues(displayedValues);
    }
}

public int getMinute() {
    if (minutePicker != null) {
        return (minutePicker.getValue() * INTERVAL);
    } else {
        return picker.getCurrentMinute();
    }
}

回答2:

all relative answer need you to set an OnTimeChangedListener. My resolution is that you extends android TimePicker,and modify the constructor of it:

    // minute
    mMinuteSpinner = (NumberPicker) findViewById(R.id.minute);
    mMinuteSpinner.setMinValue(0);
    mMinuteSpinner.setMaxValue(3);
    mMinuteSpinner.setDisplayedValues(new String[]{"0", "15", "30", "45"});
    mMinuteSpinner.setOnLongPressUpdateInterval(100);
    mMinuteSpinner.setFormatter(NumberPicker.getTwoDigitFormatter());

so you can have the interval you want.

回答3:

Thanks @Quadddd, this is the code in Kotlin

private val INTERVAL = 5


private val FORMATTER = DecimalFormat("00")

  private var picker: TimePicker? = null // set in onCreate
  private var minutePicker: NumberPicker? = null

  fun setMinutePicker() {
    val numValues = 60 / INTERVAL
    val displayedValues = arrayOfNulls<String>(numValues)
    for (i in 0 until numValues) {
      displayedValues[i] = FORMATTER.format(i * INTERVAL)
    }

    val minute = picker?.findViewById<NumberPicker>(Resources.getSystem().getIdentifier("minute", "id", "android"))
    if (minute != null) {
      minutePicker = minute
      minutePicker!!.minValue = 0
      minutePicker!!.maxValue = numValues - 1
      minutePicker!!.displayedValues = displayedValues
    }
  }

  fun getMinute(): Int {
    return if (minutePicker != null) {
      minutePicker!!.getValue() * INTERVAL
    } else {
      picker!!.currentMinute
    }
  }

回答4:

After searching the net, I didn't find the simplest solution.
So I decided to share:
You can use reflections!
The following code use intervals of 10 minutes, but you can choose the minutes you want to use in the DISPLAYED_MINS array.

private final static String[] DISPLAYED_MINS = { "0", "10", "20", "30", "40", "50" };

private NumberPicker getMinuteSpinner(TimePicker t)
{
    try
    {
        Field f = t.getClass().getDeclaredField("mMinuteSpinner"); // NoSuchFieldException
        f.setAccessible(true);
        return (NumberPicker) f.get(t); // IllegalAccessException
    }
    catch (Exception e)
    {
        Log.e("timepicker","field name has been changed, check grepcode");
        return null;
    }
}

when you create your timepicker:

final TimePicker dpStartDate = (TimePicker) view.findViewById(R.id.dpStartDate);
NumberPicker startMinSpiner = getMinuteSpinner(dpStartDate);
if (null != startMinSpiner)
{
    startMinSpiner.setMinValue(0);
    startMinSpiner.setMaxValue(DISPLAYED_MINS.length - 1);
    startMinSpiner.setDisplayedValues(DISPLAYED_MINS);
}

Just don't forget that getCurrentMinute() return the selected minute in the DISPLAY_MINS array. in order to get the minute:

int theTime = 0;
for (String number: DISPLAYED_MINS) {
    int theNumber = Integer.parseInt(number);
    if (theNumber % 5 != 0) {
        theNumber = ((int)(theNumber / 5)) * 5;
    }
    if (theNumber == dpStartDate.getCurrentMinute()) {
        theTime = theNumber;
        break;
    }
}

回答5:

You can do this programmatically.

pickStartTime = (TimePicker)findViewById(R.id.StartTime);
pickStartTime.setOnTimeChangedListener(mStartTimeChangedListener);
int nextMinute = 0;

Next, Set the OnTimeChangedListener as shown below

private TimePicker.OnTimeChangedListener mStartTimeChangedListener =
    new TimePicker.OnTimeChangedListener() {
        public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
            updateDisplay(view, startDate, hourOfDay, minute);          
        }
    };

private TimePicker.OnTimeChangedListener mNullTimeChangedListener =
    new TimePicker.OnTimeChangedListener() {
        public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {}
    };

And,

private void updateDisplay(TimePicker timePicker, Date date, int hourOfDay, int minute) 
{ 
    nextMinute = nextMinute+5;

    // remove ontimechangedlistener to prevent stackoverflow/infinite loop
    timePicker.setOnTimeChangedListener(mNullTimeChangedListener);

    // set minute
    timePicker.setCurrentMinute(nextMinute);

    // look up ontimechangedlistener again
    timePicker.setOnTimeChangedListener(mStartTimeChangedListener);

    // update the date variable for use elsewhere in code
    date.setMinutes(nextMinute);  
}