Android: How to put an Enum in a Bundle?

Question

How do you add an Enum object to an Android Bundle?

Answer 1

One thing to be aware of -- if you are using bundle.putSerializable for a Bundle to be added to a notification, you could run into the following issue:

*** Uncaught remote exception!  (Exceptions are not yet supported across processes.)
    java.lang.RuntimeException: Parcelable encountered ClassNotFoundException reading a Serializable object.

...

To get around this, you can do the following:

public enum MyEnum {
    TYPE_0(0),
    TYPE_1(1),
    TYPE_2(2);

    private final int code;

    private MyEnum(int code) {
        this.code = navigationOptionLabelResId;
    }

    public int getCode() {
        return code;
    }

    public static MyEnum fromCode(int code) {
        switch(code) {
            case 0:
                return TYPE_0;
            case 1:
                return TYPE_1;
            case 2:
                return TYPE_2;
            default:
                throw new RuntimeException(
                    "Illegal TYPE_0: " + code);
        }
    }
}

Which can then be used like so:

// Put
Bundle bundle = new Bundle();
bundle.putInt("key", MyEnum.TYPE_0.getCode());

// Get 
MyEnum myEnum = MyEnum.fromCode(bundle.getInt("key"));

Answer 2

Use bundle.putSerializable(String key, Serializable s) and bundle.getSerializable(String key):

enum Mode = {
  BASIC, ADVANCED
}

Mode m = Mode.BASIC;

bundle.putSerializable("mode", m);

...

Mode m;
m = bundle.getSerializable("mode");

Documentation: http://developer.android.com/reference/android/os/Bundle.html

Answer 3

I use kotlin.

companion object {

        enum class Mode {
            MODE_REFERENCE,
            MODE_DOWNLOAD
        }
}

then put into Intent:

intent.putExtra(KEY_MODE, Mode.MODE_DOWNLOAD.name)

when you net to get value:

mode = Mode.valueOf(intent.getStringExtra(KEY_MODE))

Answer 4

For Intent you can use this way:

Intent : kotlin

FirstActivity :

val intent = Intent(context, SecondActivity::class.java)
intent.putExtra("type", typeEnum.A)
startActivity(intent)

SecondActivity:

override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState) 
     //...
     val type = (intent.extras?.get("type") as? typeEnum.Type?)
}

Answer 5

Another option:

public enum DataType implements Parcleable {
    SIMPLE, COMPLEX;

    public static final Parcelable.Creator<DataType> CREATOR = new Creator<DataType>() {

        @Override
        public DataType[] newArray(int size) {
            return new DataType[size];
        }

        @Override
        public DataType createFromParcel(Parcel source) {
            return DataType.values()[source.readInt()];
        }
    };

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(this.ordinal());
    }
}

Answer 6

For completeness sake, this is a full example of how to put in and get back an enum from a bundle.

Given the following enum:

enum EnumType{
    ENUM_VALUE_1,
    ENUM_VALUE_2
}

You can put the enum into a bundle:

bundle.putSerializable("enum_key", EnumType.ENUM_VALUE_1);

And get the enum back:

EnumType enumType = (EnumType)bundle.getSerializable("enum_key");