Intent putExtra ArrayList<NameValuePair>

Question

Does anyone know how to add an ArrayList<NameValuePair> to an Intent as an extra?

ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(); nameValuePairs.add(new BasicNameValuePair("first_name", first_name)); nameValuePairs.add(new BasicNameValuePair("last_name", last_name)); nameValuePairs.add(new BasicNameValuePair("email", email)); nameValuePairs.add(new BasicNameValuePair("password", password));  /* Move on to step 2 */ Intent intent = new Intent(RegisterActivity1.this, RegisterActivity2.class); intent.putExtra("nvp", nameValuePairs); startActivity(intent); 

Here is the class declaration for RegisterActivity2:

public class RegisterActivity2 extends Activity implements Serializable { } 

The error in the logcat is:

> Parcel: unable to marshal value first_name="whatever" 

After implementing the suggestion by Ted Hopp, I still get an error. Here is the stack trace:

08-04 22:10:16.095: E/AndroidRuntime(5065): FATAL EXCEPTION: main > 08-04 22:10:16.095: E/AndroidRuntime(5065): > java.lang.RuntimeException: Unable to start activity > ComponentInfo{/.RegisterActivity2}: java.lang.RuntimeException: > Parcelable encountered IOException reading a Serializable object (name > = database.NVP) 08-04 22:10:16.095: E/AndroidRuntime(5065):   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2070) > 08-04 22:10:16.095: E/AndroidRuntime(5065):   at > android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2095) > 08-04 22:10:16.095: E/AndroidRuntime(5065):   at > android.app.ActivityThread.access$600(ActivityThread.java:135) 08-04 > 22:10:16.095: E/AndroidRuntime(5065):     at > android.app.ActivityThread$H.handleMessage(ActivityThread.java:1201) > 08-04 22:10:16.095: E/AndroidRuntime(5065):   at > android.os.Handler.dispatchMessage(Handler.java:99) 08-04 > 22:10:16.095: E/AndroidRuntime(5065):     at > android.os.Looper.loop(Looper.java:137) 08-04 22:10:16.095: > E/AndroidRuntime(5065):   at > android.app.ActivityThread.main(ActivityThread.java:4849) 08-04 > 22:10:16.095: E/AndroidRuntime(5065):     at > java.lang.reflect.Method.invokeNative(Native Method) 08-04 > 22:10:16.095: E/AndroidRuntime(5065):     at > java.lang.reflect.Method.invoke(Method.java:511) 08-04 22:10:16.095: > E/AndroidRuntime(5065):   at > com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795) > 08-04 22:10:16.095: E/AndroidRuntime(5065):   at > com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562) 08-04 > 22:10:16.095: E/AndroidRuntime(5065):     at > dalvik.system.NativeStart.main(Native Method) 08-04 22:10:16.095: > E/AndroidRuntime(5065): Caused by: java.lang.RuntimeException: > Parcelable encountered IOException reading a Serializable object (name > = database.NVP) 08-04 22:10:16.095: E/AndroidRuntime(5065):   at android.os.Parcel.readSerializable(Parcel.java:2144) 08-04 > 22:10:16.095: E/AndroidRuntime(5065):     at > android.os.Parcel.readValue(Parcel.java:2016) 08-04 22:10:16.095: > E/AndroidRuntime(5065):   at > android.os.Parcel.readListInternal(Parcel.java:2235) 08-04 > 22:10:16.095: E/AndroidRuntime(5065):     at > android.os.Parcel.readArrayList(Parcel.java:1655) 08-04 22:10:16.095: > E/AndroidRuntime(5065):   at > android.os.Parcel.readValue(Parcel.java:1986) 08-04 22:10:16.095: > E/AndroidRuntime(5065):   at > android.os.Parcel.readMapInternal(Parcel.java:2226) 08-04 > 22:10:16.095: E/AndroidRuntime(5065):     at > android.os.Bundle.unparcel(Bundle.java:223) 08-04 22:10:16.095: > E/AndroidRuntime(5065):   at > android.os.Bundle.getSerializable(Bundle.java:1254) 08-04 > 22:10:16.095: E/AndroidRuntime(5065):     at > android.content.Intent.getSerializableExtra(Intent.java:4268) 08-04 > 22:10:16.095: E/AndroidRuntime(5065):     at > .RegisterActivity2.onCreate(RegisterActivity2.java:24) 08-04 > 22:10:16.095: E/AndroidRuntime(5065):     at > android.app.Activity.performCreate(Activity.java:5244) 08-04 > 22:10:16.095: E/AndroidRuntime(5065):     at > android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1082) > 08-04 22:10:16.095: E/AndroidRuntime(5065):   at > android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2034) > 08-04 22:10:16.095: E/AndroidRuntime(5065):   ... 11 more 08-04 > 22:10:16.095: E/AndroidRuntime(5065): Caused by: > java.io.InvalidClassException: > org.apache.http.message.BasicNameValuePair; IllegalAccessException > 08-04 22:10:16.095: E/AndroidRuntime(5065):   at > java.io.ObjectStreamClass.resolveConstructorClass(ObjectStreamClass.java:694) > 08-04 22:10:16.095: E/AndroidRuntime(5065):   at > java.io.ObjectStreamClass.newInstance(ObjectStreamClass.java:655) > 08-04 22:10:16.095: E/AndroidRuntime(5065):   at > java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1816) > 08-04 22:10:16.095: E/AndroidRuntime(5065):   at > java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:787) > 08-04 22:10:16.095: E/AndroidRuntime(5065):   at > java.io.ObjectInputStream.readObject(ObjectInputStream.java:2003) > 08-04 22:10:16.095: E/AndroidRuntime(5065):   at > java.io.ObjectInputStream.readObject(ObjectInputStream.java:1960) > 08-04 22:10:16.095: E/AndroidRuntime(5065):   at > android.os.Parcel.readSerializable(Parcel.java:2142) 08-04 > 22:10:16.095: E/AndroidRuntime(5065):     ... 23 more 

Answer 1

As others have noted, when you want to pass an array as an intent extra, the elements need to implement Serializable. In your case, the approach is fairly simple (not quite — see below): define your own subclass of BasicNameValuePair and declare it to implement the interface.

public class NVP extends BasicNameValuePair implements Serializable {     public NVP(String name, String value) {         super(name, value);     } } 

Then you can use it like you've been trying:

ArrayList<NVP> nameValuePairs = new ArrayList<NVP>(); nameValuePairs.add(new NVP("first_name", first_name)); nameValuePairs.add(new NVP("last_name", last_name)); nameValuePairs.add(new NVP("email", email)); nameValuePairs.add(new NVP("password", password));  /* Move on to step 2 */ Intent intent = new Intent(RegisterActivity1.this, RegisterActivity2.class); intent.putExtra("nvp", nameValuePairs); startActivity(intent); 

On the receiving end, you'll need to pull it out with:

ArrayList<NVP> nameValuePairs = (ArrayList<NVP>) intent.getSerializable("nvp"); 

EDIT Well, the above won't work because BasicNameValuePair doesn't have a default constructor and the serialization mechanism requires non-serializable ancestor classes to have a default constructor. Otherwise you'll get an exception on deserialization.

Unfortunately, this means that the solution isn't as simple as I made out. One work-around is to define your own class to implement Parcelable, as @keerthana murugesan suggests in his answer. If you've implemented Parcelable before, you know it's a bit of a pain. Another work-around is to define a class that wraps a BasicNameValuePair (instead of deriving from it) and manages its own serialization:

public class NVP implements NameValuePair, Serializable {     private BasicNameValuePair nvp;      public NVP(String name, String value) {         nvp = new BasicNameValuePair(name, value);     }      @Override     public String getName() {         return nvp.getName();     }      @Override     public String getValue() {         return nvp.getValue();     }      // serialization support      private static final long serialVersionUID = 1L;      private void writeObject(ObjectOutputStream out) throws IOException {         out.writeString(nvp.getName());         out.writeString(nvp.getValue());     }      private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {         nvp = new BasicNameValuePair(in.readString(), in.readString());     }      private void readObjectNoData() throws ObjectStreamException {         // nothing to do     } } 

Answer 2

I had the same problem, trying to send objects in ArrayList without implementing Seiralizable in Object class.

The shortcut solution was to envelop ArrayList in Bundle.

So, in the first activity ->

ArrayList<Object> objects = new ArrayList<Object>();  // Object class does not implement Serializable interface  Bundle extra = new Bundle(); extra.putSerializable("objects", objects);  Intent intent = new Intent(getBaseContext(), ShowSpread.class); intent.putExtra("extra", extra); 

Second activity ->

Bundle extra = getIntent().getBundleExtra("extra"); ArrayList<Object> objects = (ArrayList<Object>) extra.getSerializable("objects") 

Works fine.