Android E/Parcel:解组时找不到类(仅在三星 Tab3 上) [英] Android E/Parcel﹕ Class not found when unmarshalling (only on Samsung Tab3)
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问题描述
我一直无法解决出现此错误的原因，而且只能在运行 4.4.2 的三星 Tab3 设备上解决?当我的 MainActivity 启动另一个 Activity 并在 Intent 中传递 Parcelable 类时会发生这种情况，如下所示:
I've been unable to resolve why this error occurs, and only on a Samsung Tab3 device, running 4.4.2? It happens when my MainActivity starts another Activity, and passes a Parcelable class in the intent like so:
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 像这样获取可分割的数据:
TestActivity gets the parcelable data like so:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.test_activity);
TestParcel cfgOptions = getIntent().getExtras().getParcelable("cfgOptions");
}
TestParcel 类:
The class TestParcel:
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 - 但这是我们需要它工作的设备.这是三星 logcat:
Again, I only see this on the Samsung Tab3 device - but that's the device we need it to work on. Here's the samsung 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)
推荐答案
由于某种奇怪的原因，类加载器似乎没有正确设置.
For some strange reason it looks like the class loader isn't set up properly.
在 TestActivity.onCreate() 中尝试以下操作之一:
Try one of the following in TestActivity.onCreate():
TestParcel cfgOptions = getIntent().getParcelableExtra("cfgOptions");
<小时>
Intent intent = getIntent();
intent.setExtrasClassLoader(TestParcel.class.getClassLoader());
TestParcel cfgOptions = intent.getParcelableExtra("cfgOptions");
<小时>
Bundle extras = getIntent().getExtras();
extras.setClassLoader(TestParcel.class.getClassLoader());
TestParcel cfgOptions = extras.getParcelable("cfgOptions");
<小时>
或者，将parcelable打包成一个包:
Alternatively, wrap the parcelable into a bundle:
Bundle b = new Bundle();
b.putParcelable("options", cfgOptions);
Intent intent = new Intent(MDex.this, TestActivity.class);
intent.putExtra("bundle", b);
获得:
Bundle b = getIntent().getBundleExtra("bundle");
TestParcel cfgOptions = b.getParcelable("options");
这篇关于Android E/Parcel:解组时找不到类(仅在三星 Tab3 上)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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