Android: How to put an Enum in a Bundle?

问题:

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

回答1:

Just pass it as int from ordinal(). Restore it from values[].

回答2:

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"); 

回答3:

I know this is an old question, but I came with the same problem and I would like to share how I solved it. The key is what Miguel said: Enums are Serializable.

Given the following enum:

enum YourEnumType {     ENUM_KEY_1,      ENUM_KEY_2 } 

Put:

Bundle args = new Bundle(); args.putSerializable("arg", YourEnumType.ENUM_KEY_1); 

回答4:

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"); 

回答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

回答6:

I use kotlin.

companion object {          private 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)) 

回答7:

Another option:

public enum DataType implements Parcleable { SIMPLE, COMPLEX;  public static final Parcelable.Creator CREATOR = new Creator() {      @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()); } 

}

回答8:

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

回答9:

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")); 

回答10:

A simple way, assign integer value to enum

See the following example:

public enum MyEnum {      TYPE_ONE(1), TYPE_TWO(2), TYPE_THREE(3);      private int value;      MyEnum(int value) {         this.value = value;     }      public int getValue() {         return value;     }  } 

Sender Side:

Intent nextIntent = new Intent(CurrentActivity.this, NextActivity.class); nextIntent.putExtra("key_type", MyEnum.TYPE_ONE.getValue()); startActivity(nextIntent); 

Receiver Side:

Bundle mExtras = getIntent().getExtras(); int mType = 0; if (mExtras != null) {     mType = mExtras.getInt("key_type", 0); }  /* OR     Intent mIntent = getIntent();     int mType = mIntent.getIntExtra("key_type", 0); */  if(mType == MyEnum.TYPE_ONE.getValue())     Toast.makeText(NextActivity.this, "TypeOne", Toast.LENGTH_SHORT).show(); else if(mType == MyEnum.TYPE_TWO.getValue())     Toast.makeText(NextActivity.this, "TypeTwo", Toast.LENGTH_SHORT).show(); else if(mType == MyEnum.TYPE_THREE.getValue())     Toast.makeText(NextActivity.this, "TypeThree", Toast.LENGTH_SHORT).show(); else     Toast.makeText(NextActivity.this, "Wrong Key", Toast.LENGTH_SHORT).show(); 

回答11:

I think convert enum to int (for normal enum) and then set on bundle was been easiest way. like this code for intent:

myIntent.PutExtra("Side", (int)PageType.Fornt); 

then for check state:

int type = Intent.GetIntExtra("Side",-1); if(type == (int)PageType.Fornt) {     //To Do } 

but not work for all enum type!

文章来源: Android: How to put an Enum in a Bundle?