Android E/Parcel:解组时找不到类(仅限三星Tab3)

Question

我一直无法解决为什么会出现这种错误,并且只能在运行4.4.2的三星Tab3设备上解决？它发生在我的MainActivity启动另一个Activity时,并在intent中传递一个Parcelable类,如下所示:

    private void debugTest(TestParcel cfgOptions){
        TestParcel cfgOptions = new TestParcel();
        cfgOptions.setValue(15); //just to verify

        Intent intent = new Intent(MainActivity.this, TestActivity.class);
        intent.putExtra("cfgOptions", cfgOptions);
        startActivityForResult(intent, DBG_TEST);
    }

TestActivity获取可分配的数据,如下所示:

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.test_activity);

    TestParcel cfgOptions = getIntent().getExtras().getParcelable("cfgOptions");
}

TestParcel类:

    import android.os.Parcel;
    import android.os.Parcelable;

    public class TestParcel implements Parcelable {
    private long l_ucs_value = 0;
    private String s_rx_number = "";

    //constructor
    public TestParcel() {
        l_ucs_value = 0;
        s_rx_number = "";
    }

    public void RxNumber(String s) {
        s_rx_number = s;
    }
    public String RxNumber() {
        return s_rx_number;
    }

    //-----------------------------------------------------------------------
    public void setValue(long v){
        l_ucs_value = v;
    }
    public long getValue(){ return l_ucs_value; }


    protected TestParcel(Parcel in) {
        l_ucs_value = in.readLong();
        s_rx_number = in.readString();
    }

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

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeLong(l_ucs_value);
        dest.writeString(s_rx_number);
    }

    @SuppressWarnings("unused")
    public static final Parcelable.Creator<TestParcel> CREATOR = new Parcelable.Creator<TestParcel>() {
        @Override
        public TestParcel createFromParcel(Parcel in) {
            return new TestParcel(in);
        }

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

同样,我只在三星Tab3设备上看到这个 - 但这是我们需要它的设备.这是三星logcat:

02-18 08:05:55.393    2235-2571/? E/Parcel? Class not found when unmarshalling: com.vms.android.VersatileDEX.TestParcel
java.lang.ClassNotFoundException: com.vms.android.VersatileDEX.TestParcel
        at java.lang.Class.classForName(Native Method)
        at java.lang.Class.forName(Class.java:251)
        at java.lang.Class.forName(Class.java:216)
        at android.os.Parcel.readParcelableCreator(Parcel.java:2133)
        at android.os.Parcel.readParcelable(Parcel.java:2097)
        at android.os.Parcel.readValue(Parcel.java:2013)
        at android.os.Parcel.readArrayMapInternal(Parcel.java:2314)
        at android.os.Bundle.unparcel(Bundle.java:249)
        at android.os.Bundle.getString(Bundle.java:1118)
        at android.content.Intent.getStringExtra(Intent.java:5148)
        at com.android.server.am.ActivityStackSupervisor.startActivityLocked(ActivityStackSupervisor.java:1467)
        at com.android.server.am.ActivityStackSupervisor.startActivityMayWait(ActivityStackSupervisor.java:1063)
        at com.android.server.am.ActivityManagerService.startActivityAsUser(ActivityManagerService.java:4134)
        at com.android.server.am.ActivityManagerService.startActivity(ActivityManagerService.java:4032)
        at android.app.ActivityManagerNative.onTransact(ActivityManagerNative.java:159)
        at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:2712)
        at android.os.Binder.execTransact(Binder.java:404)
        at dalvik.system.NativeStart.run(Native Method)
 Caused by: java.lang.NoClassDefFoundError: com/vms/android/VersatileDEX/TestParcel
        at java.lang.Class.classForName(Native Method)
        at java.lang.Class.forName(Class.java:251)
        at java.lang.Class.forName(Class.java:216)
        at android.os.Parcel.readParcelableCreator(Parcel.java:2133)
        at android.os.Parcel.readParcelable(Parcel.java:2097)
        at android.os.Parcel.readValue(Parcel.java:2013)
        at android.os.Parcel.readArrayMapInternal(Parcel.java:2314)
        at android.os.Bundle.unparcel(Bundle.java:249)
        at android.os.Bundle.getString(Bundle.java:1118)
        at android.content.Intent.getStringExtra(Intent.java:5148)
        at com.android.server.am.ActivityStackSupervisor.startActivityLocked(ActivityStackSupervisor.java:1467)
        at com.android.server.am.ActivityStackSupervisor.startActivityMayWait(ActivityStackSupervisor.java:1063)
        at com.android.server.am.ActivityManagerService.startActivityAsUser(ActivityManagerService.java:4134)
        at com.android.server.am.ActivityManagerService.startActivity(ActivityManagerService.java:4032)
        at android.app.ActivityManagerNative.onTransact(ActivityManagerNative.java:159)
        at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:2712)
        at android.os.Binder.execTransact(Binder.java:404)
        at dalvik.system.NativeStart.run(Native Method)
 Caused by: java.lang.ClassNotFoundException: Didn't find class "com.vms.android.VersatileDEX.TestParcel" on path: DexPathList[[directory "."],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:67)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
        at java.lang.Class.classForName(Native Method)
        at java.lang.Class.forName(Class.java:251)
        at java.lang.Class.forName(Class.java:216)
        at android.os.Parcel.readParcelableCreator(Parcel.java:2133)
        at android.os.Parcel.readParcelable(Parcel.java:2097)
        at android.os.Parcel.readValue(Parcel.java:2013)
        at android.os.Parcel.readArrayMapInternal(Parcel.java:2314)
        at android.os.Bundle.unparcel(Bundle.java:249)
        at android.os.Bundle.getString(Bundle.java:1118)
        at android.content.Intent.getStringExtra(Intent.java:5148)
        at com.android.server.am.ActivityStackSupervisor.startActivityLocked(ActivityStackSupervisor.java:1467)
        at com.android.server.am.ActivityStackSupervisor.startActivityMayWait(ActivityStackSupervisor.java:1063)
        at com.android.server.am.ActivityManagerService.startActivityAsUser(ActivityManagerService.java:4134)
        at com.android.server.am.ActivityManagerService.startActivity(ActivityManagerService.java:4032)
        at android.app.ActivityManagerNative.onTransact(ActivityManagerNative.java:159)
        at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:2712)
        at android.os.Binder.execTransact(Binder.java:404)
        at dalvik.system.NativeStart.run(Native Method)

Answer 1

由于一些奇怪的原因,它似乎没有正确设置类加载器.

请尝试以下方法之一TestActivity.onCreate():

TestParcel cfgOptions = getIntent().getParcelableExtra("cfgOptions");

Intent intent = getIntent();
intent.setExtrasClassLoader(TestParcel.class.getClassLoader());
TestParcel cfgOptions = intent.getParcelableExtra("cfgOptions");

Bundle extras = getIntent().getExtras();
extras.setClassLoader(TestParcel.class.getClassLoader());
TestParcel cfgOptions = extras.getParcelable("cfgOptions");

或者,将parcelable包装成一个包:

Bundle b = new Bundle();
b.putParcelable("options", cfgOptions);
Intent intent = new Intent(MDex.this, TestActivity.class);
intent.putExtra("bundle", b);

要得到:

Bundle b = getIntent().getBundleExtra("bundle");
TestParcel cfgOptions = b.getParcelable("options");

Answer 2

在我的情况下,新的Intent().putExtra(key,parcelable)在内部自动创建新的bundle给我unmarshall错误我不知道为什么,所以我不得不自己创建新的bundle,在它上面添加parcelable并添加捆绑意图.通过这样做,它解决了这个问题.

Answer 3

只是想在这里更简洁明了答案 -

//sending a parcelable class to another activity -----------------

MyParcelableOptionsClass mpoc = new MyParcelableOptionsClass();

Bundle b = new Bundle();
b.putParcelable("options", mpoc );

Intent intent = new Intent(MyActivity.this, OtherActivity.class);
intent.putExtra("bundle", b);

startActivityForResult(intent, 1);


//getting the parcelable class from OtherActivity------------------

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.other_activity);

    Bundle b = getIntent().getBundleExtra("bundle");
    MyParcelableOptionsClass mpoc = b.getParcelable("options");
}


//returning the parcelable class back from OtherActivity -----------

 Bundle b = new Bundle();
 b.putParcelable("options", mpoc);

 Intent intent = new Intent();
 intent.putExtra("bundle", b);

 setResult(0, intent);


//and getting the parcelable class back in MyActivity --------------

onActivityResult(int requestCode, int resultCode, Intent data){
    if(null != data){
        Bundle b = data.getBundleExtra("bundle");
        MyParcelableOptionsClass mpoc = b.getParcelable("options");
    }
}

Answer 4

最近的三星 S8 手机也发生了同样的问题。创建包明确为我工作。我使用了以下代码，它不需要包的字符串标识符：

// Create the intent to start the activity.
Bundle bundle = new Bundle();
bundle.putParcelable("YOUR_PARCELABLE_ID", yourPacelable);
Intent intent = new Intent(context, YourActivity.class);
intent.putExtras(bundle);

然后在活动中读取parcelable：

// In your activity, read parcelable back.
YourParcelable p = getIntent().getParcelableExtra("YOUR_PARCELABLE_ID");

我希望这有帮助。