问题描述
限时送ChatGPT账号..我已经实现了一个 Parcelable 类:
i've implemented a Parcelable class:
public class Evento implements Parcelable {
private int;
private String ;
private String imagen;
//more atts
//Constructors, setters and getters
public Evento(Parcel in) {
this.id = in.readInt();
this.titulo = in.readString();
this.imagen=in.readString();
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(id);
dest.writeString(titulo);
dest.writeString(imagen);
}
public static final Parcelable.Creator<Evento> CREATOR = new Parcelable.Creator<Evento>() {
@Override
public Evento createFromParcel(Parcel in) {
return new Evento(in);
}
@Override
public Evento[] newArray(int size) {
return new Evento[size];
}
};
在我的活动中,我试图将一个 arrayList 传递给另一个活动:我覆盖了 onItemClick 并以这种方式传递信息:
In my activity, i'm trying to pass an arrayList to an other activitie: I'me overwriten onItemClick and i'm passing the information this way:
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
//create new activitie
ArrayList<Eventos> eventos = new ArrayList<Eventos>();
Intent intent = new Intent(QueActivity.this, ProductosCategorias.class);
//Create information
Bundle informacion= new Bundle();
informacion.putParcelableArrayList("eventos", eventos);
intent.putExtras(informacion);
并在其他活动中接收它:
and receiving it in the other activity:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_productos_categorias);
lv = (ListView) findViewById(R.id.listaCategoriaElegida);
Bundle informacionRecibida = getIntent().getExtras();
ArrayList<Evento> eventos =new ArrayList<Evento>();
eventos= informacionRecibida.getParcelableArrayList("eventos");
我收到空指针异常.我已经调试了它,当我执行 getParcelableArrayList("eventos") 时我得到了 NULL,我的意思是,我的 arraylist eventos 是空的,所以,我没有收到任何信息.
I'm getting a null pointer exception. I've debbuged it and i'm getting NULL when i execute the getParcelableArrayList("eventos"), i mean, my arraylist eventos is null, so, i'm receiving no information.
任何帮助都会很棒
推荐答案
这段代码
Bundle informacion= new Bundle();
informacion.putParcelableArrayList("eventos", ArrayList<Eventos> eventos);
intent.putExtras(informacion);
应该是
Bundle informacion = new Bundle();
ArrayList<Eventos> mas = new ArrayList<Eventos>();
informacion.putSerializable("eventos", mas);
intent.putExtras(informacion);
并确保您的 Eventos 结构像一个可序列化的对象
and Make sure your Eventos structure like a serializable object
private class Eventos implements Serializable {
}
阅读价值观
ArrayList<Eventos> madd=getIntent().getSerializableExtra(key);
这篇关于传递 ArrayList<CustomObject>活动之间的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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