i m trying to get the wheel of the numberPicker animated. I found the corresponding question here:
How to change NumberPicker's value with animation?
But i cannot solve it with the suppposed answers. Can somebody please help me?
When changing the value of the numberPicker from lets say 100 to 200, i want the wheel to increment from the old value to the new one. The wheel should slide to the new value. In the link passsy solved it with reflection but i don t know how to use it in practice..
Thank @passsy. Inspired his answer: This solution supports multiple increment/decrement steps. Also, can be executed with a start delay and for multiple numberPickers (without extra coding).
class IncreaseValue {
private int counter = 0;
private final NumberPicker picker;
private final int incrementValue;
private final boolean increment;
private final Handler handler = new Handler();
private final Runnable fire = new Runnable() { @Override public void run() { fire(); } };
/*public*/ IncreaseValue(final NumberPicker picker, final int incrementValue) {
this.picker = picker;
if (incrementValue > 0) {
increment = true;
this.incrementValue = incrementValue;
} else {
increment = false;
this.incrementValue = -incrementValue;
}
}
/*public*/ void run(final int startDelay) {
handler.postDelayed(fire, startDelay); // This will execute the runnable passed to it (fire)
// after [startDelay in milliseconds], ASYNCHRONOUSLY.
}
private void fire() {
++counter;
if (counter > incrementValue) return;
try {
// refelction call for
// picker.changeValueByOne(true);
final Method method = picker.getClass().getDeclaredMethod("changeValueByOne", boolean.class);
method.setAccessible(true);
method.invoke(picker, increment);
} catch (final NoSuchMethodException | InvocationTargetException |
IllegalAccessException | IllegalArgumentException e) {
Log.d(TAG, "...", e);
}
handler.postDelayed(fire, 120); // This will execute the runnable passed to it (fire)
// after 120 milliseconds, ASYNCHRONOUSLY. Customize this value if necessary.
}
}
The usage:
// Suppose picker1 as a NumberPicker
IncreaseValue increasePicker1 = new IncreaseValue(picker1, 10); // So picker1 will be increased 10 steps.
increasePicker1.run(0); // Increase immediately. If you want to run it from onCreate(), onStart() or ... of your activity, you will probably need to pass a positive value to it (e.g. 100 milliseconds).
It's really simple if you want to increment the value by one.
just call changeValueByOne(myNumberPicker, true); to increment the numberpicker by one with animation. (false to decrement)
increment from 100-200 is not possible with this method
/**
* using reflection to change the value because
* changeValueByOne is a private function and setValue
* doesn't call the onValueChange listener.
*
* @param higherPicker
* the higher picker
* @param increment
* the increment
*/
private void changeValueByOne(final NumberPicker higherPicker, final boolean increment) {
Method method;
try {
// refelction call for
// higherPicker.changeValueByOne(true);
method = higherPicker.getClass().getDeclaredMethod("changeValueByOne", boolean.class);
method.setAccessible(true);
method.invoke(higherPicker, increment);
} catch (final NoSuchMethodException e) {
e.printStackTrace();
} catch (final IllegalArgumentException e) {
e.printStackTrace();
} catch (final IllegalAccessException e) {
e.printStackTrace();
} catch (final InvocationTargetException e) {
e.printStackTrace();
}
}
