Question

我设置了一个名为“Contact”的类，Contact类包含Getters和Setters。在主要活动中。

List<Contact> contactList;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

}

private class GetContacts extends AsyncTask<String, String, List<Contact>>{

    @Override
    protected void onPreExecute() {

        // 
    }
    @Override
    protected List<Contacts> doInBackground(String... params) {
        // executing some tasks;
        return contactList;
    }
    @Override
    protected void onPostExecute(List<Contact> result) {
        contactList = result;

    }

现在我想将contactList发送给另一个活动。

Answer 1

如果ArrayList<T>类型为T，您可以采用相同的方式传递Serializable。

您可以调用putExtra (String name, Serializable value) Intent来存储，getSerializableExtra (String name)进行检索。

示例：

ArrayList<String> your_list= new ArrayList<String>();
intent.putExtra("your_list", your_list);

在另一项活动中：

ArrayList<String> your_list = (ArrayList<String>) getIntent().getSerializableExtra("your_list");

Answer 2

putParcelableArrayListExtra(String keyValue, ArrayList< ? extends Parcelable);

使用Intent类中的上述方法。注意：自定义类（？）必须实现Parcelable接口类。

Answer 3

您的Contact.java类

public class GymItem implements Serializable{
}

MainActivity.class

Intent intent = new Intent(MainActivity.this,
                    OtherActivity.class);
Bundle bundleObject = new Bundle();
bundleObject.putSerializable("KEY", contactList);
intent.putExtras(bundleObject);
startActivity(intent);

OtherActivity.java

ArrayList<Contact> contactList = new ArrayList<Contact>();

Bundle bundleObject = getIntent().getExtras();
contactList = (ArrayList<Contact>) bundleObject
            .getSerializable("KEY");

Answer 4

A类扩展了活动{

List<Contact> contactList;  //your contact list

Intent AtoB = new Intent(getApplicationContext(),B.class);
AtoB.putParcelableArrayListExtra("Contacts",contactList);
startActivity(AtoB);

}

class Contact implements Parcelable{
private String name;
private String phoneNo;

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

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeString(name);
    dest.writeString(phoneNo);

}
public Contact(){

}

private Contact(Parcel in) {
    name = in.readString();
    phoneNo = in.readString();


}

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


    public Contact[] newArray(int size) {
        return new Contact[size];
    }
    public ContactcreateFromParcel(Parcel in) {
        // TODO Auto-generated method stub
        return new Contact(in);
    }

}; 
}

 class B extends Activity{

 ArrayList<Contact> listfromA = 
 getIntent().getParcelableExtra("Contacts"); 
  }

我想通过List＆lt;＆gt;从活动A到B

4 个答案: