Question

我试图将parcelable数组从MainActivity转移到SecondActivity，但遇到了一些奇怪的问题我定义的可分类类如下所述：

public class Person implements Parcelable {
    public int id;
    public String name;
    public byte[] key;

    public Person() {}

    public Person(int id_, String name_, byte[] key_) {
        id = id_;
        name = name_;
        key = key_;
    }

    private Person(Parcel in) {
        id = in.readInt();
        name = in.readString();
        int kl = in.readInt();
        if (kl > 0) {
            key = new byte[kl];
            in.readByteArray(key);
        }
    }

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

        @Override
        public Person createFromParcel(Parcel source) {
            return new Person(source);
        }

        @Override
        public Person[] newArray(int size) {
            return new Person[size];
        }
    };

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(id);
        dest.writeString(name);
        if (key != null) {
            dest.writeInt(key.length);
            dest.writeByteArray(key);
        } else {
            dest.writeInt(0);
        }
    }
}

在MainActivity中，我放了一个人和一个人阵列：

Intent intent = new Intent(this, SecondActivity.class);
Bundle bundle = new Bundle();
bundle.putParcelable("p", mPerson); // pay attention to this
bundle.putParcelableArray("persons", mPersons);
intent.putExtras(bundle);
startActivity(intent);

在SecondActivity中，我得到了人和人阵列：

Intent intent = getIntent();
Bundle bundle = intent.getExtras();
mPerson = bundle.getParcelable("p");
Parcelable[] ps = bundle.getParcelableArray("persons");

到目前为止一切顺利 [但!!]当我编码如下：
在MainActivity中，

Intent intent = new Intent(this, SecondActivity.class);
Bundle bundle = new Bundle();
bundle.putParcelable("person", mPerson); // code changed here
bundle.putParcelableArray("persons", mPersons);
intent.putExtras(bundle);
startActivity(intent);

在SecondActivity中，

Intent intent = getIntent();
Bundle bundle = intent.getExtras();
mPerson = bundle.getParcelable("person"); // problem happened here
Parcelable[] ps = bundle.getParcelableArray("persons");

我遇到了运行时异常，程序崩溃了：

06-09 13:52:01.458: E/AndroidRuntime(27761): FATAL EXCEPTION: main
06-09 13:52:01.458: E/AndroidRuntime(27761): Process: com.example.parceabletest, PID: 27761
06-09 13:52:01.458: E/AndroidRuntime(27761): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.parceabletest/com.example.parceabletest.SecondActivity}: java.lang.RuntimeException: Parcel android.os.Parcel@44b7ed40: Unmarshalling unknown type code 6619248 at offset 140
06-09 13:52:01.458: E/AndroidRuntime(27761):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2248)
06-09 13:52:01.458: E/AndroidRuntime(27761):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2298)
06-09 13:52:01.458: E/AndroidRuntime(27761):    at android.app.ActivityThread.access$800(ActivityThread.java:144)
06-09 13:52:01.458: E/AndroidRuntime(27761):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
06-09 13:52:01.458: E/AndroidRuntime(27761):    at android.os.Handler.dispatchMessage(Handler.java:102)
06-09 13:52:01.458: E/AndroidRuntime(27761):    at android.os.Looper.loop(Looper.java:212)
06-09 13:52:01.458: E/AndroidRuntime(27761):    at android.app.ActivityThread.main(ActivityThread.java:5151)
06-09 13:52:01.458: E/AndroidRuntime(27761):    at java.lang.reflect.Method.invokeNative(Native Method)
06-09 13:52:01.458: E/AndroidRuntime(27761):    at java.lang.reflect.Method.invoke(Method.java:515)
06-09 13:52:01.458: E/AndroidRuntime(27761):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
06-09 13:52:01.458: E/AndroidRuntime(27761):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)
06-09 13:52:01.458: E/AndroidRuntime(27761):    at dalvik.system.NativeStart.main(Native Method)
06-09 13:52:01.458: E/AndroidRuntime(27761): Caused by: java.lang.RuntimeException: Parcel android.os.Parcel@44b7ed40: Unmarshalling unknown type code 6619248 at offset 140
06-09 13:52:01.458: E/AndroidRuntime(27761):    at android.os.Parcel.readValue(Parcel.java:2112)
06-09 13:52:01.458: E/AndroidRuntime(27761):    at android.os.Parcel.readArrayMapInternal(Parcel.java:2346)
06-09 13:52:01.458: E/AndroidRuntime(27761):    at android.os.Bundle.unparcel(Bundle.java:249)
06-09 13:52:01.458: E/AndroidRuntime(27761):    at android.os.Bundle.getParcelable(Bundle.java:1206)
06-09 13:52:01.458: E/AndroidRuntime(27761):    at com.example.parceabletest.SecondActivity.onCreate(SecondActivity.java:27)
06-09 13:52:01.458: E/AndroidRuntime(27761):    at android.app.Activity.performCreate(Activity.java:5231)
06-09 13:52:01.458: E/AndroidRuntime(27761):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
06-09 13:52:01.458: E/AndroidRuntime(27761):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2212)
06-09 13:52:01.458: E/AndroidRuntime(27761):    ... 11 more

我真的不知道为什么......我只是改变了＆＃34; p＆＃34;到了＃34;人＆＃34;坏事发生了。＆LT; _＆LT;

Answer 1

不要使用ParcelableArray，它实际上并不是你想要的。使用writeTypedArray和readTypedArray方法。

请查看我的回答here，了解有关如何执行该操作的详细信息。

Answer 2

试试这个：

if(getIntent().getExtras() != null)
{

}

可能是您的MainActivity没有第一次获取意图数据。

Answer 3

检查清单文件中的应用程序标记中是否添加活动标记。喜欢

<activity
        android:name=".MainActivity"
        android:label="@string/app_name" >

Android put和get parcelable array error

3 个答案: