API Android 21 - Widget TimePicker

Question

Ho un problema con il widget TimePicker sull'API 21. Fino all'API 19 lo TimePicker era un elenco su/giù come iOS, ma in 21+ è rotondo, come quello in l'app del calendario.

Come posso utilizzare quello vecchio in 21+, perché si rompe il mio disegno, se è il nuovo widget.

Answer 1

È possibile specificare il selettore di orario in stile filatore impostando l'attributo timePickerMode su "spinner". Il valore predefinito su Materiale è "orologio".

<TimePicker 
    ... 
    android:timePickerMode="spinner" /> 

Answer 2

È possibile utilizzare la modalità di selezione in modo programmatico utilizzando la classe personalizzata. Per le versioni precedenti Da lolipop cambierà la modalità Timepicker da clock a spinner e ti permetterà anche di disabilitare la selezione del tempo dopo un certo tempo (usando setmax() & setmin()). Nel codice seguente ho usato set max() per limitare il tempo massimo.

public class RangeTimePickerDialog extends TimePickerDialog { 

    private int minHour = -1; 
    private int minMinute = -1; 

    private int maxHour = 25; 
    private int maxMinute = 25; 

    private int currentHour = 0; 
    private int currentMinute = 0; 

    private Calendar calendar = Calendar.getInstance(); 
    private DateFormat dateFormat; 


    public RangeTimePickerDialog(Context context, int dialogTheme, OnTimeSetListener callBack, int hourOfDay, int minute, boolean is24HourView) { 
     super(context, callBack, hourOfDay, minute, is24HourView); 
     currentHour = hourOfDay; 
     currentMinute = minute; 
     dateFormat = DateFormat.getTimeInstance(DateFormat.SHORT); 
     fixSpinner(context, hourOfDay, minute, is24HourView); 

     try { 
      Class<?> superclass = getClass().getSuperclass(); 
      Field mTimePickerField = superclass.getDeclaredField("mTimePicker"); 
      mTimePickerField.setAccessible(true); 
      TimePicker mTimePicker = (TimePicker) mTimePickerField.get(this); 
      mTimePicker.setOnTimeChangedListener(this); 
     } catch (NoSuchFieldException e) { 
     } catch (IllegalArgumentException e) { 
     } catch (IllegalAccessException e) { 
     } 
    } 

    public void setMin(int hour, int minute) { 
     minHour = hour; 
     minMinute = minute; 
    } 

    public void setMax(int hour, int minute) { 
     maxHour = hour; 
     maxMinute = minute; 
    } 

    @Override 
    public void onTimeChanged(TimePicker view, int hourOfDay, int minute) { 

     boolean validTime = true; 
     if (hourOfDay < minHour || (hourOfDay == minHour && minute < minMinute)){ 
      validTime = false; 
     } 

     if (hourOfDay > maxHour || (hourOfDay == maxHour && minute > maxMinute)){ 
      validTime = false; 
     } 

     if (validTime) { 
      currentHour = hourOfDay; 
      currentMinute = minute; 
     } 

     updateTime(currentHour, currentMinute); 
     updateDialogTitle(view, currentHour, currentMinute); 
    } 

    private void updateDialogTitle(TimePicker timePicker, int hourOfDay, int minute) { 
     calendar.set(Calendar.HOUR_OF_DAY, hourOfDay); 
     calendar.set(Calendar.MINUTE, minute); 
     String title = dateFormat.format(calendar.getTime()); 
     setTitle(title); 
    } 


    private void fixSpinner(Context context, int hourOfDay, int minute, boolean is24HourView) { 
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { // android:timePickerMode spinner and clock began in Lollipop 
      try { 
       // Get the theme's android:timePickerMode 
       //two modes are available clock mode and spinner mode ... selecting spinner mode for latest versions 
       final int MODE_SPINNER = 2; 
       Class<?> styleableClass = Class.forName("com.android.internal.R$styleable"); 
       Field timePickerStyleableField = styleableClass.getField("TimePicker"); 
       int[] timePickerStyleable = (int[]) timePickerStyleableField.get(null); 
       final TypedArray a = context.obtainStyledAttributes(null, timePickerStyleable, android.R.attr.timePickerStyle, 0); 
       Field timePickerModeStyleableField = styleableClass.getField("TimePicker_timePickerMode"); 
       int timePickerModeStyleable = timePickerModeStyleableField.getInt(null); 
       final int mode = a.getInt(timePickerModeStyleable, MODE_SPINNER); 
       a.recycle(); 
       if (mode == MODE_SPINNER) { 
        TimePicker timePicker = (TimePicker) findField(TimePickerDialog.class, TimePicker.class, "mTimePicker").get(this); 
        Class<?> delegateClass = Class.forName("android.widget.TimePicker$TimePickerDelegate"); 
        Field delegateField = findField(TimePicker.class, delegateClass, "mDelegate"); 
        Object delegate = delegateField.get(timePicker); 
        Class<?> spinnerDelegateClass; 
        if (Build.VERSION.SDK_INT != Build.VERSION_CODES.LOLLIPOP) { 
         spinnerDelegateClass = Class.forName("android.widget.TimePickerSpinnerDelegate"); 
        } else { 

         spinnerDelegateClass = Class.forName("android.widget.TimePickerClockDelegate"); 
        } 
        if (delegate.getClass() != spinnerDelegateClass) { 
         delegateField.set(timePicker, null); // throw out the TimePickerClockDelegate! 
         timePicker.removeAllViews(); // remove the TimePickerClockDelegate views 
         Constructor spinnerDelegateConstructor = spinnerDelegateClass.getConstructor(TimePicker.class, Context.class, AttributeSet.class, int.class, int.class); 
         spinnerDelegateConstructor.setAccessible(true); 
         // Instantiate a TimePickerSpinnerDelegate 
         delegate = spinnerDelegateConstructor.newInstance(timePicker, context, null, android.R.attr.timePickerStyle, 0); 
         delegateField.set(timePicker, delegate); // set the TimePicker.mDelegate to the spinner delegate 
         // Set up the TimePicker again, with the TimePickerSpinnerDelegate 
         timePicker.setIs24HourView(is24HourView); 
         timePicker.setCurrentHour(hourOfDay); 
         timePicker.setCurrentMinute(minute); 
         timePicker.setOnTimeChangedListener(this); 
        } 
       } 
      } catch (Exception e) { 
       throw new RuntimeException(e); 
      } 
     } 
    } 
    private static Field findField(Class objectClass, Class fieldClass, String expectedName) { 
     try { 
      Field field = objectClass.getDeclaredField(expectedName); 
      field.setAccessible(true); 
      return field; 
     } catch (NoSuchFieldException e) {} // ignore 
     // search for it if it wasn't found under the expected ivar name 
     for (Field searchField : objectClass.getDeclaredFields()) { 
      if (searchField.getType() == fieldClass) { 
       searchField.setAccessible(true); 
       return searchField; 
      } 
     } 
     return null; 
    } 
}