java - 在 Android 中的 Activity 之间传递对象

Question

我有一个对象 Address，它的值如下:name、address、city、state、zip、phone 等。

我使用 HTTP 调用填充对象。这个变量确实被填充了。然后我尝试通过这样做将对象传递给下一个 Activity :

Intent intent = new Intent(NewAddressActivity.this, BuildingTypeActivity.class);
Bundle b = new Bundle();
b.putParcelable("newAddress", (Parcelable)newAddress); // i had to cast 'newAddress' to 'Parcelable' otherwise, it was giving me an error
intent.putExtra("newAddress", b);
startActivity(intent);

在下一个 Activity (BuildingTypeActivity) 中，我像这样获取对象。

Bundle b = this.getIntent().getExtras();
if (b != null) {
Address address = b.getParcelable("newAddress");
}

问题是，当我到达“putParcelable”行时，它总是崩溃。它可能与转换为 Parcelable 有关。所以，我假设这不是传递对象的正确方法？

如能提供有关如何正确传递对象的任何提示，我们将不胜感激。

Answer 1

你需要做这样的事情:

import android.os.Parcel;
import android.os.Parcelable;

public class Address implements Parcelable {

    private String name, address, city, state, phone, zip;

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

    /*
            THE ORDER YOU READ OBJECT FROM AND WRITE OBJECTS TO YOUR PARCEL MUST BE THE SAME
     */

    @Override
    public void writeToParcel(Parcel parcel, int i) {
        parcel.writeString(name);
        parcel.writeString(address);
        parcel.writeString(city);
        parcel.writeString(state);
        parcel.writeString(phone);
        parcel.writeString(zip);
    }


    public Address(Parcel p){
        name = p.readString();
        address = p.readString();
        city = p.readString();
        state = p.readString();
        phone = p.readString();
        zip = p.readString();
    }

    // THIS IS ALSO NECESSARY
    public static final Creator<Address> CREATOR = new Creator<Address>() {
        @Override
        public Address createFromParcel(Parcel parcel) {
            return new Address(parcel);
        }

        @Override
        public Address[] newArray(int i) {
            return new Address[0];
        }
    };
}

现在您不必将 newAddress 实例转换为 Parcelable。