Android: How to put an Enum in a Bundle?

Question

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

Answer 1

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 2

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 3

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 4

Enums are Serializable so there is no issue.

Given the following enum:

enum YourEnum {
  TYPE1,
  TYPE2
}

Bundle:

// put
bundle.putSerializable("key", YourEnum.TYPE1);

// get 
YourEnum yourenum = (YourEnum) bundle.get("key");

Intent:

// put
intent.putExtra("key", yourEnum);

// get
yourEnum = (YourEnum) intent.getSerializableExtra("key");

Answer 5

It may be better to pass it as string from myEnumValue.name() and restore it from YourEnums.valueOf(s), as otherwise the enum's ordering must be preserved!

Longer explanation: Convert from enum ordinal to enum type

Answer 6

I've created a Koltin extension:

fun Bundle.putEnum(key: String, enum: Enum<*>) {
    this.putString( key , enum.name )
}

inline fun <reified T: Enum<T>> Intent.getEnumExtra(key:String) : T {
    return enumValueOf( getStringExtra(key) )
}

Create a bundle and add:

Bundle().also {
   it.putEnum( "KEY" , ENUM_CLAS.ITEM )
}

and get:

intent?.getEnumExtra< ENUM_CLAS >( "KEY" )?.let{}