Send an array of objects to another activity

Question

I'm trying to send an ArrayList of objects to another activity, but i got this error on the logcat, and i can't find a way to solve it, i'm a begginer.

GrupoMuscular class:

public class GrupoMuscular implements Parcelable{

    private int id;
    private static int id_aux = 0;
    private String nome;
    private int imagem;
    private List<Exercicio> exercicios;

    public GrupoMuscular(String nome, int img) {
        //super();
        id = id_aux;
        id_aux++;
        this.nome = nome;
        this.imagem = img;
        this.exercicios = new ArrayList<Exercicio>();
    }

    public String getNome() {
        return nome;
    }

    public void setNome(String nome) {
        this.nome = nome;
    }

    public int getImagem() {
        return imagem;
    }

    public void setImagem(int imagem) {
        this.imagem = imagem;
    }

    public List<Exercicio> getGruposMuscular() {
        return exercicios;
    }

    public void addExercicio(int id, String nome, String descricao, int imagem){        
        Exercicio ex = new Exercicio(id, nome, descricao, imagem);
        exercicios.add(ex);
    }

    public void setGruposMuscular(List<Exercicio> gruposMuscular) {
        this.exercicios = gruposMuscular;
    }

    public List<Exercicio> getExercicios() {
        return exercicios;
    }

    public void setExercicios(List<Exercicio> exercicios) {
        this.exercicios = exercicios;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    @Override
    public int describeContents() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        // TODO Auto-generated method stub

    }
}

ExerciciosActivity: Here is when i'm trying to send the array, when i click on a item in the listview.

 listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                    Intent intent;

                        intent = new Intent(ExerciciosActivity.this, ListaExerciciosActivity.class);
                        intent.putParcelableArrayListExtra("gruposMusculares", gruposMusculares);
                        startActivity(intent);
                }});
            }

ListaExerciciosActivity: Here is where i want receive the array.

gruposMusculares = getIntent().getParcelableArrayListExtra("gruposMusculares");

Logcat:

01-03 18:24:08.889: E/AndroidRuntime(18813): FATAL EXCEPTION: main
01-03 18:24:08.889: E/AndroidRuntime(18813): Process: com.AMOV.mr.fit, PID: 18813
01-03 18:24:08.889: E/AndroidRuntime(18813): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.AMOV.mr.fit/com.AMOV.mr.fit.ListaExerciciosActivity}: android.os.BadParcelableException: Parcelable protocol requires a Parcelable.Creator object called  CREATOR on class com.AMOV.mr.fit.GrupoMuscular
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2215)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2265)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.app.ActivityThread.access$800(ActivityThread.java:145)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1206)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.os.Handler.dispatchMessage(Handler.java:102)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.os.Looper.loop(Looper.java:136)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.app.ActivityThread.main(ActivityThread.java:5144)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at java.lang.reflect.Method.invokeNative(Native Method)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at java.lang.reflect.Method.invoke(Method.java:515)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at dalvik.system.NativeStart.main(Native Method)
01-03 18:24:08.889: E/AndroidRuntime(18813): Caused by: android.os.BadParcelableException: Parcelable protocol requires a Parcelable.Creator object called  CREATOR on class com.AMOV.mr.fit.GrupoMuscular
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.os.Parcel.readParcelableCreator(Parcel.java:2156)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.os.Parcel.readParcelable(Parcel.java:2097)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.os.Parcel.readValue(Parcel.java:2013)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.os.Parcel.readListInternal(Parcel.java:2343)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.os.Parcel.readArrayList(Parcel.java:1703)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.os.Parcel.readValue(Parcel.java:2034)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.os.Parcel.readArrayMapInternal(Parcel.java:2314)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.os.Bundle.unparcel(Bundle.java:249)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.os.Bundle.getParcelableArrayList(Bundle.java:1250)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.content.Intent.getParcelableArrayListExtra(Intent.java:4729)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at com.AMOV.mr.fit.ListaExerciciosActivity.onCreate(ListaExerciciosActivity.java:27)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.app.Activity.performCreate(Activity.java:5231)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
01-03 18:24:08.889: E/AndroidRuntime(18813):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2169)

The error tells you what you are missing: Parcelable protocol requires a Parcelable.Creator object called CREATOR on class com.AMOV.mr.fit.GrupoMuscular — Marko
– Marko, Commented Jan 3, 2015 at 18:38
Your stacktrace tells you exactly what's wrong - Parcelable protocol requires a Parcelable.Creator object called CREATOR on class com.AMOV.mr.fit.GrupoMuscular — Mike M.
– Mike M., Commented Jan 3, 2015 at 18:38
@MikeM. you're right, but i don't know how i can apply it to my project — Marco
– Marco, Commented Jan 3, 2015 at 18:48

Marco · Accepted Answer · 2015-01-03 20:50:30Z

1

Your class missing CREATOR:

Class implementing the Parcelable interface must also have a static field called CREATOR, which is an object implementing the Parcelable.Creator interface.

 public static final Parcelable.Creator<GrupoMuscular> CREATOR
         = new Parcelable.Creator<GrupoMuscular>() {
     public GrupoMuscular createFromParcel(Parcel in) {
         return new GrupoMuscular(in);
     }

     public GrupoMuscular[] newArray(int size) {
         return new GrupoMuscular[size];
     }
 };

Hope this help!

edited Jan 3, 2015 at 20:50

Marco

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answered Jan 3, 2015 at 19:15

Xcihnegn

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1 Comment

Marco Over a year ago

That's what i missed! Thank's @Xingchen, it helped a lot!

Łukasz Culer · Accepted Answer · 2015-01-03 18:59:58Z

1

You haven't make Your class Parcerable properly - Your writeToParcel method is empty, and You haven't create CREATOR object. Really simple example of implementing Parcerable interface is described on Android Developers:

http://developer.android.com/reference/android/os/Parcelable.html

The easier way to send object of custom class to another activity is using Serializable interface - Your class has only to implement it and whole work is done.

intent = new Intent(ExerciciosActivity.this, ListaExerciciosActivity.class);
Bundle bundle = new Bundle();  
bundle.putSerializable("gruposMusculares", gruposMusculares);
intent.putExtras(bundle);
startActivity(intent);

Notice that sending objects by Serializable is a little bit slower than by Parcerable and that all objects classes contained in class implementing Serializable have to implement Serializable too.

answered Jan 3, 2015 at 18:59

Łukasz Culer

211 silver badge4 bronze badges

1 Comment

Marco Over a year ago

i had no idea that i could to the same using this method! Thank's!

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