friends,
i am using following code to write Serializable object to external storage.
it throws me error java.io.NotSerializableException even my object is serializable any one guide me what mistake am i doing?
public class MyClass implements Serializable
{
// other veriable stuff here...
public String title;
public String startTime;
public String endTime;
public boolean classEnabled;
public Context myContext;
public MyClass(Context context,String title, String startTime, boolean enable){
this.title = title;
this.startTime = startTime;
this.classEnabled = enable;
this.myContext = context;
}
public boolean saveObject(MyClass obj) {
final File suspend_f=new File(cacheDir, "test");
FileOutputStream fos = null;
ObjectOutputStream oos = null;
boolean keep = true;
try {
fos = new FileOutputStream(suspend_f);
oos = new ObjectOutputStream(fos);
oos.writeObject(obj); // exception throws here
}
catch (Exception e) {
keep = false;
}
finally {
try {
if (oos != null) oos.close();
if (fos != null) fos.close();
if (keep == false) suspend_f.delete();
}
catch (Exception e) { /* do nothing */ }
}
return keep;
}
}
and calling from activity class to save it
MyClass m= new MyClass(this, "hello", "abc", true);
boolean result =m.saveObject(m);
any help would be appreciated.
To make a Java object serializable you implement the java. io. Serializable interface. This is only a marker interface which tells the Java platform that the object is serializable.
In other words: all classes you ever create, were or will be created are all serializable.
This fails due to the Context field in your class. Context objects are not serializable.
Per the Serializable documentation - "When traversing a graph, an object may be encountered that does not support the Serializable interface. In this case the NotSerializableException will be thrown and will identify the class of the non-serializable object."
You can either remove the Context field entirely, or apply the transient attribute to the Context field so that it is not serialized.
public class MyClass implements Serializable
{
...
public transient Context myContext;
...
}
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