Activity之间通过intent传递object时，该object的class需要实现Parcelable。
Interface for classes whose instances can be written to and restored from a Parcel. Classes implementing the Parcelable interface must also have a non-null static field called CREATOR of a type that implements the Parcelable.Creator interface.
A typical implementation of Parcelable is:
public class MyParcelable implements Parcelable { private int mData; public int describeContents() { //一般返回0即可 return 0; } public void writeToParcel(Parcel out, int flags) { out.writeInt(mData); } public static final Parcelable.Creator<MyParcelable> CREATOR = new Parcelable.Creator<MyParcelable>() { public MyParcelable createFromParcel(Parcel in) { return new MyParcelable(in); } public MyParcelable[] newArray(int size) { return new MyParcelable[size]; } }; private MyParcelable(Parcel in) { mData = in.readInt(); } }http://developer.android.com/reference/android/os/Parcelable.html
最核心的地方是
private MyParcelable(Parcel in)
和
writeToParcel(Parcel out, int flags)
读写顺序要一致。
public class Bill implements Parcelable { Integer fee; String title; Boolean result; public int describeContents() { return 0; } public void writeToParcel(Parcel out, int flags) { out.writeInt(fee); out.writeString(title); out.writeByte((byte) (result!=null && result ? 1 : 0)); } public static final Parcelable.Creator<Bill> CREATOR = new Parcelable.Creator<Bill>() { public Bill createFromParcel(Parcel in) { return new Bill(in); } public Bill[] newArray(int size) { return new Bill[size]; } }; private Bill(Parcel in) { fee = in.readInt(); title = in.readString(); result = (in.readByte()==1); } }
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