我如何通过一个自定义类型的对象从一个活动到另一个使用类意图的putExtra()方法?


当前回答

如果你对putExtra特性的使用不是很特别,只是想启动另一个带有对象的活动,你可以查看我写的GNLauncher (https://github.com/noxiouswinter/gnlib_android/wiki#gnlauncher)库,它试图使这个过程更直接。

GNLauncher可以将对象/数据从另一个活动发送到一个活动,就像调用活动中的函数一样简单,并将所需的数据作为参数。它引入了类型安全,并消除了必须序列化的所有麻烦,使用字符串键附加到意图,并在另一端撤销相同的操作。

其他回答

首先在类中实现Parcelable。然后像这样传递object。

SendActivity.java

ObjectA obj = new ObjectA();

// Set values etc.

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

startActivity(i);

ReceiveActivity.java

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

包字符串不是必须的,只是在两个活动中字符串需要相同

参考

我发现最简单的解决办法是… 创建带有getter和setter的静态数据成员的类。

从一个活动中设置并从另一个活动中获取该对象。

活动

mytestclass.staticfunctionSet("","",""..etc.);

活动b

mytestclass obj= mytestclass.staticfunctionGet();

最简单的方法是在item是字符串的情况下使用以下代码:

intent.putextra("selected_item",item)

接收:

String name = data.getStringExtra("selected_item");
public class SharedBooking implements Parcelable{

    public int account_id;
    public Double betrag;
    public Double betrag_effected;
    public int taxType;
    public int tax;
    public String postingText;

    public SharedBooking() {
        account_id = 0;
        betrag = 0.0;
        betrag_effected = 0.0;
        taxType = 0;
        tax = 0;
        postingText = "";
    }

    public SharedBooking(Parcel in) {
        account_id = in.readInt();
        betrag = in.readDouble();
        betrag_effected = in.readDouble();
        taxType = in.readInt();
        tax = in.readInt();
        postingText = in.readString();
    }

    public int getAccount_id() {
        return account_id;
    }
    public void setAccount_id(int account_id) {
        this.account_id = account_id;
    }
    public Double getBetrag() {
        return betrag;
    }
    public void setBetrag(Double betrag) {
        this.betrag = betrag;
    }
    public Double getBetrag_effected() {
        return betrag_effected;
    }
    public void setBetrag_effected(Double betrag_effected) {
        this.betrag_effected = betrag_effected;
    }
    public int getTaxType() {
        return taxType;
    }
    public void setTaxType(int taxType) {
        this.taxType = taxType;
    }
    public int getTax() {
        return tax;
    }
    public void setTax(int tax) {
        this.tax = tax;
    }
    public String getPostingText() {
        return postingText;
    }
    public void setPostingText(String postingText) {
        this.postingText = postingText;
    }
    public int describeContents() {
        // TODO Auto-generated method stub
        return 0;
    }
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(account_id);
        dest.writeDouble(betrag);
        dest.writeDouble(betrag_effected);
        dest.writeInt(taxType);
        dest.writeInt(tax);
        dest.writeString(postingText);

    }

    public static final Parcelable.Creator<SharedBooking> CREATOR = new Parcelable.Creator<SharedBooking>()
    {
        public SharedBooking createFromParcel(Parcel in)
        {
            return new SharedBooking(in);
        }
        public SharedBooking[] newArray(int size)
        {
            return new SharedBooking[size];
        }
    };

}

传递数据:

Intent intent = new Intent(getApplicationContext(),YourActivity.class);
Bundle bundle = new Bundle();
i.putParcelableArrayListExtra("data", (ArrayList<? extends Parcelable>) dataList);
intent.putExtras(bundle);
startActivity(intent);

检索数据:

Bundle bundle = getIntent().getExtras();
dataList2 = getIntent().getExtras().getParcelableArrayList("data");

你可以通过intent发送可序列化对象

// send where details is object
ClassName details = new ClassName();
Intent i = new Intent(context, EditActivity.class);
i.putExtra("Editing", details);
startActivity(i);


//receive
ClassName model = (ClassName) getIntent().getSerializableExtra("Editing");

And 

Class ClassName implements Serializable {
}