Intent传递值对象 --- Serializable&Parcelable
Intent可以在Activity之间传递实现了Serializable和Parcelable接口的对象。Serializable在序列化时会产生大量临时变量,从而引起频繁的GC(Gabage Collection)。而且在使用内存时,Parcelable比Serializable性能高,说白了就是快,所以推荐使用Parcelable。但是Parcelable不能使用在要将数据存储在磁盘上的情况,此时得用Serializable。实现Serializable很简单只需要implements Serializable即可。Parcelable实现如下:
public class User implements Parcelable { private String name; private int age; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public User(String name, int age) { this.name = name; this.age = age; } @Override public int describeContents() { return 0; } @Override public void writeToParcel(Parcel dest, int flags) { dest.writeString(getName()); dest.writeInt(getAge()); } public static final Creator<User> CREATOR = new Creator<User>() { @Override public User createFromParcel(Parcel source) { return new User(source.readString(),source.readInt()); } @Override public User[] newArray(int size) { return new User[size]; } }; }
在传递对象的Activity中:
i.putExtra("user", new User("user", 2));
接收时:
User user = getIntent().getParcelableExtra("user");