android - Parcelable 传输失败

Question

我正在尝试我的第一次 Parcelable 传输，但并不顺利。这是我的 Parcelable 类:

public class Element implements Parcelable, Serializable {
    private static final long serialVersionUID = 1L;
    String name;
    String id;
    byte[] password;

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

        public Element createFromParcel(Parcel source) {
            return new Element(source);
        }

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

    };

    private Element(Parcel in){
        name = in.readString();
        id = in.readString();
        password = new byte[in.readInt()];
        in.readByteArray(password);
    }
    public Element(String name,String id,byte[] password){
        this.name=name;
        this.id=id;
        this.password=password;
    }

    @Override
    public String toString() {
        return name;
    }

    public int describeContents() {
        return 0;
    }

    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(name);
        dest.writeString(id);
        dest.writeInt(password.length);
        dest.writeByteArray(password);
    }

}

如您所见，它是一个简单的 Parcelable，具有 2 个字符串字段和 1 个字节数组。

现在我通过我的主要 Activity 将它发送到第二个 Activity :

            //Inside the main activity
            Intent i = new Intent(MainActivity.this, DisplayActivity.class);
            i.putExtra("element", (Parcelable)adapter.getItem(pos));
            startActivity(i);

然后，我在第二个 Activity 中收到了 Parcelable:

    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.display);

        Element e = getIntent().getExtras().getParcelable("element");
        //this line makes my app crash. No idea why.

Answer 1

这样试试:

Element obj = new Element();

//set your data here before send

Intent i = new Intent(this, MyActivity.class);
i.putExtra("com.package.Element", obj);

startActivity(i);

然后检索它:

public class MyActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Bundle b = getIntent().getExtras();
        Element obj = b.getParcelable("com.package.Element");
    }

}