Java对象的可序列化错误

Question

Edit, Here's how i solved using the comments So after trying different ways of serializing and looking through my code, I finally found out that each object drawn in the renderer contains FloatBuffers. I created a capsule class thanks to Ted Hopp. Then I tried returning the float representation of the FloatBuffers using .array(), which you can't do. My guess is because these are running on threads. So using a suggestion from Learn OpenGL ES to use get, i instead did

public float[] getVertexBuffer()
{
    float[] local = new float[vertexBuffer.capacity()];
    vertexBuffer.get(local);
    return local;
}

Which does work and returns the float[].

Then i store them all in a capsule object for each mGrid object i created

        Encapsulate capsule = new Encapsulate(values);
        for(int i = 0; i < values[0]; i++)
        {
            for(int j = 0; j < values[1]; j++)
            {
                capsule.storeVertex(i,j,mRenderer.mGrid[i*values[1] + j].getVertexBuffer());
                capsule.storeColors(i,j,mRenderer.mGrid[i*values[1] + j].getmColors());
                capsule.storePillar(i,j,mRenderer.mGrid[i*values[1] + j].getPillarPositions());
            }
        }

Which I can then ultimately save because it's serializable. Thank you all

PROBLEM DESCRIPTION So i'm trying to save a GLSurfaceView object, whose class is denoted as

class GLWorld extends GLSurfaceView implements Serializable

Now I'm sure as i do the saving correctly.

public void saveSimulation()
{
    String fileName = "Test Save";
    try {
        FileOutputStream fos = openFileOutput(fileName, Context.MODE_PRIVATE);
        ObjectOutputStream oos = new ObjectOutputStream(fos);
        oos.writeObject(mGLView);
        Log.d("Save","Successfully Written");
        oos.close();
        fos.close();
    } catch (FileNotFoundException e) {
        Log.d("Save","File not found exception");
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        Log.d("Save","IO exception");
        // TODO Auto-generated catch block
        e.printStackTrace();
    }


    finish();
}

But i'm getting an error i have no clue how to fix. I've spent hours looking around but haven't found anything like it.

09-16 17:36:50.639: W/System.err(2996): java.io.NotSerializableException: java.nio.FloatToByteBufferAdapter

Along with many more system err lines below that, which i believe stem from this one error.

My GLWorld creates a renderer object in it which has different objects with floatbuffers in it which store vertex and color data. I can't figure out what to do to get past this error, or why those float buffers are throwing an error. Everything runs smoothly except actually trying to save this GLWorld object and it's driving me insane.

Answer 1

Just declaring that a class implements Serializable is not enough to successfully serialize objects of that class. The default implementation requires that every field of the class be serializable. In your case, there's a field of type FloatToByteBufferAdapter that isn't serializable (there may be more).

You can define your own serialization mechanism to serialize only what you need. The details can be found in the Serializable docs . Be aware that by subclassing GLSurfaceView , it is unlikely you will be able to successfully deserialize this class, even if you write the correct support methods. For one thing, GLSurfaceView does not have a default (no-arg) constructor, which is a requirement of Java's serialization mechanism. Also, many objects simply cannot be serialized (eg, streams).

I suggest that you encapsulate the data you want to serialize in a helper class and limit the serialization/deserialization to those data.

Answer 2

必须假定mGLView继承中的某些内容包含FloatTOByteBufferAdapter，该对象不可序列化。