I'm currently unable to read ObjectInputStream from a FileInputStream object.

Here's the code:

Saving Array (No problems here, but is included for clarity. It works flawlessly.)

[source lang="java"]public void arrayListSave(ArrayList<NewFormat> formats) {
FileOutputStream out;
try {
out = this.openFileOutput("format", Activity.MODE_PRIVATE);
ObjectOutputStream output = new ObjectOutputStream(new BufferedOutputStream(out));
output.writeObject(formats);
output.close();
}
catch (FileNotFoundException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
}[/source]
Loading Array:




[source lang="java"]public ArrayList<NewFormat> loadArray() {
ArrayList<NewFormat> formats = null;
FileInputStream in;
try {
in = this.openFileInput("format");
ObjectInputStream input = new ObjectInputStream(new BufferedInputStream(in));
formats = (ArrayList<NewFormat>) input.readObject();
input.close();
}
catch (FileNotFoundException e) {
e.printStackTrace();
}
catch (IOException e) {
Log.d("LoadFile", "Can't load data", e); //Always hit IOException <---------------
}
catch (ClassNotFoundException e) {
e.printStackTrace();
}
return formats;
}[/source]
I use a TableRow subclass, called NewFormat, to output data as a table. Here's the NewFormat class code:


[source lang="java"]package tt.tt;

import java.io.Serializable;
import android.content.Context;
import android.widget.TableRow;
import android.widget.TextView;

public class NewFormat extends TableRow implements Serializable {
private static final long serialVersionUID = 1L;
TextView test;
TextView string;

public NewFormat(Context c) {
super©;
test = new TextView©;
string = new TextView©;
TableRow.LayoutParams params = new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT, TableRow.LayoutParams.WRAP_CONTENT, 1f);
this.addView(test, 0, params);
this.addView(string, 1, params);
}

public void save(int t, String words) {
test.setText(Integer.toString(t));
string.setText(words);
}

public void delete() {
test.getEditableText().clear();
string.getEditableText().clear();
}
}[/source]


The problem is that whenever I hit the line of code:

[source lang="java"]ObjectInputStream input = new ObjectInputStream(new BufferedInputStream(in));[/source]

It always spits out IOException. It's as if the source stream is corrupted or something. But, I did other tests, and it seems the FileOutputStream I have created to save the arrays work flawlessly. I can read the data just fine. It's the problem of loading the arrays back from the stream file.

Does anyone know how to fix this problem? Thanks in advance.

Update:

I fixed this problem.

The actual fix to this is to:

• Do not implement a Serializable nested class in a class extending from any ViewGroup classes.
  

I can't emphasize how important it is to not implement a Serializable in a nested class. If the nested class is Serializable, it would also mean the outer class is Serializable. It's a hypothesis I came up with when I realize how crucial it is.

In short, ObjectOutputStreams work as intended, just not for classes with nested Serializables.