42

如果我尝试写

Car myCarObject=getCar();
Intent details = new Intent(Start.this, DetailsCar.class);
                details.putExtra("Car", myCarObject);
                startActivity(details);

Eclipse在行中向我显示编译错误“The Method Put Extra is Ambiguous for the type Intent”

  details.putExtra("Car", myCarObject);

如果我使用代码

Car myCarObject=getCar();
ArrayList<Car> parcelableExtra = new ArrayList<Car>();
                parcelableExtra.add(myCarObject);

Intent details = new Intent(Start.this, DetailsCar.class);
                details.putExtra("Car", parcelableExtra);
                startActivity(dettagli);

我尝试在目标 Intent 中使用此代码加载额外内容

ArrayList<Car> parcelableExtra = new ArrayList<Car>();
        parcelableExtra = (ArrayList<Car>) getIntent().getExtras().getParcelable("Car");
        Car c=parcelableExtra.get(0);

我收到此警告

12-14 05:30:07.669: W/Bundle(19823): Key Car expected Parcelable but value was a java.util.ArrayList.  The default value <null> was returned.
12-14 05:30:07.679: W/Bundle(19823): Attempt to cast generated internal exception:
12-14 05:30:07.679: W/Bundle(19823): java.lang.ClassCastException: java.util.ArrayList
12-14 05:30:07.679: W/Bundle(19823):    at android.os.Bundle.getParcelable(Bundle.java:1106)
12-14 05:30:07.679: W/Bundle(19823):    at my.app.com.DetailsCar.onCreate(DetailsCar.java:43)
12-14 05:30:07.679: W/Bundle(19823):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
12-14 05:30:07.679: W/Bundle(19823):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
12-14 05:30:07.679: W/Bundle(19823):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
12-14 05:30:07.679: W/Bundle(19823):    at android.app.ActivityThread.access$1500(ActivityThread.java:117)
12-14 05:30:07.679: W/Bundle(19823):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
12-14 05:30:07.679: W/Bundle(19823):    at android.os.Handler.dispatchMessage(Handler.java:99)
12-14 05:30:07.679: W/Bundle(19823):    at android.os.Looper.loop(Looper.java:130)
12-14 05:30:07.679: W/Bundle(19823):    at android.app.ActivityThread.main(ActivityThread.java:3687)
12-14 05:30:07.679: W/Bundle(19823):    at java.lang.reflect.Method.invokeNative(Native Method)
12-14 05:30:07.679: W/Bundle(19823):    at java.lang.reflect.Method.invoke(Method.java:507)
12-14 05:30:07.679: W/Bundle(19823):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
12-14 05:30:07.679: W/Bundle(19823):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
12-14 05:30:07.679: W/Bundle(19823):    at dalvik.system.NativeStart.main(Native Method)
12-14 05:30:07.679: W/dalvikvm(19823): threadid=1: thread exiting with uncaught exception (group=0x40018578)

并且应用程序因空点异常而崩溃

我的汽车对象是 Parcelable

所以....怎么了？

4

5 回答 5

88

第一个错误：'The Method Put Extra is Ambiguous for the type Intent'。

该类Car既是Serializableand Parcelable，编译器不知道是使用putExtra(Serializable s)还是putExtra(Parcelable p)处理您的请求。因此，您必须Car在使用Intent.putExtra().

Intent.putExtra("car", (Parcelable)myCarObject);
Intent.putExtra("car", (Serializable)myCarObject);

第二个错误：java.lang.ClassCastException: java.util.ArrayList

您将Car对象放入 aArrayList并用于putExtra发送到下一个活动。An ArrayListis not Parcelablebut only Serializable。putExtra(ArrayList)作品为，putExtra(Serializable)但您阅读它getParcelable()。ArrayList不能强制转换为Parcelable。

于 2012-12-14T14:42:17.760 回答
28

我用这个

在发件人活动中

Intent intent = new Intent(activity, MyActivity.class);

Bundle bundle = new Bundle();
bundle.putSerializable("my object", myObject);

intent.putExtras(bundle);

startActivity(intent);

在接收器中：

myObject = (MyObject) getIntent().getExtras().getSerializable("my object");

对我来说效果很好，试试吧。但是对象必须是可序列化的:)

于 2013-08-01T11:49:31.937 回答
13

这就是我传递可序列化对象的方式，我相信它应该以相同的方式用于可打包。经过：

Intent intent=new Intent(OverviewActivity.this,CarDetailTabActivity.class);         
            intent.putExtra("CAR",myCarObject);
            startActivity(intent);

收到：

Car carObject=(Car)getIntent().getSerializableExtra("CAR");

车：

import java.io.Serializable;

public class Car implements Serializable {

private static final long serialVersionUID = 1L;
......
于 2012-12-14T14:26:34.793 回答
2

解决方案Serializable：由您的类实现接口，例如implements Serializable

于 2018-07-05T10:28:08.623 回答
1

getIntent().getExtras()Bundle从您的意图中返回额外的，而不是您的数据。要获取您的列表，请使用getIntent().getParcelableArrayListExtra("Car")

于 2012-12-14T14:26:49.607 回答