De Java à l'aide enum avec l'instruction switch

Si whichView est un objet de la GuideView Enum, suite à des travaux bien. Veuillez noter qu'il n'y a pas de qualificatif pour la constante après case.

switch (whichView) {
    case SEVEN_DAY:
        ...
        break;
    case NOW_SHOWING:
        ...
        break;
}

J'aime quelques usages de Java enum:

1. .nom() permet de récupérer le nom enum en Chaîne.
2. .ordinal() vous permettent d'obtenir la valeur entière basée sur 0.
3. Vous pouvez joindre d'autres paramètres de valeur avec chaque enum.
4. et, bien sûr, l'interrupteur est activé.

enum avec les paramètres de valeur:

    enum StateEnum {
        UNDEFINED_POLL  ( 1 * 1000L,       4 * 1000L),
        SUPPORT_POLL    ( 1 * 1000L,       5 * 1000L),
        FAST_POLL       ( 2 * 1000L,  4 * 60 * 1000L),
        NO_POLL         ( 1 * 1000L,       6 * 1000L); 
        ...
    }

exemple:

private void queuePoll(StateEnum se) {
    //debug print se.name() if needed
    switch (se) {
        case UNDEFINED_POLL:
            ...
            break;
        case SUPPORT_POLL:
            ...
            break;

enumerations accessing is very simple in switch case

private TYPE currentView;

//declaration of enum 
public enum TYPE {
        FIRST, SECOND, THIRD
    };

//handling in switch case
switch (getCurrentView())
        {
        case FIRST:
            break;
        case SECOND:
            break;
        case THIRD:
            break;
        }

//getter and setter of the enum
public void setCurrentView(TYPE currentView) {
        this.currentView = currentView;
    }

    public TYPE getCurrentView() {
        return currentView;
    }

//usage of setting the enum 
setCurrentView(TYPE.FIRST);

avoid the accessing of TYPE.FIRST.ordinal() it is not recommended always

Je le fais comme

public enum State
{
    //Retrieving, //the MediaRetriever is retrieving music //
    Stopped, //media player is stopped and not prepared to play
    Preparing, //media player is preparing...
    Playing, //playback active (media player ready!). (but the media player
                //may actually be
                //paused in this state if we don't have audio focus. But we
                //stay in this state
                //so that we know we have to resume playback once we get
                //focus back)
    Paused; //playback paused (media player ready!)

    //public final static State[] vals = State.values();//copy the values(), calling values() clones the array

};

public State getState()
{
        return mState;   
}

Et l'utilisation de l'Instruction Switch

switch (mService.getState())
{
case Stopped:
case Paused:

    playPause.setBackgroundResource(R.drawable.selplay);
    break;

case Preparing:
case Playing:

    playPause.setBackgroundResource(R.drawable.selpause);
    break;    
}