序列化android.net.Uri对象

Question

我想序列化android.net.Uri类型的对象的状态.

下面是我的带有writeObject和readObject方法的模型类

public class ReminderObject implements Serializable {
private boolean isReminderOn;
private int fromHours, toHours;
private int interval;
private ArrayList<CharSequence> daysToRepeat;
private Uri toneToPlay;
private AdvanceSettingsObject adv;

public ReminderObject(boolean isReminderOn, int fromHours, int toHours,
        int interval, ArrayList<CharSequence> daysToRepeat, Uri toneToPlay,
        AdvanceSettingsObject adv) {
    super();
    this.isReminderOn = isReminderOn;
    this.fromHours = fromHours;
    this.toHours = toHours;
    this.interval = interval;
    this.daysToRepeat = daysToRepeat;
    this.toneToPlay = toneToPlay;
    this.adv = adv;
} 
/*
getters and setters
*/
    public void writeObject(ObjectOutputStream op){
    try {
        op.defaultWriteObject();
        op.writeChars(toneToPlay.toString());
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}
public void readObject(ObjectInputStream in){
    try{
        in.defaultReadObject();
        toneToPlay = Uri.parse(in.readUTF());
    }catch(Exception e){

    }
}

}

MainActivity的代码段:

try {
        ObjectOutputStream os = new ObjectOutputStream(new     FileOutputStream(Environment.getExternalStorageDirectory().getAbsolutePath()+"/ReminderData.txt")    );
        os.writeObject(reminder); // Getting above mentioned Exception here
        Log.i("TAG","reminder serialized");
        ObjectInputStream is = new ObjectInputStream(new FileInputStream(Environment.getExternalStorageDirectory().getAbsolutePath()+"/ReminderData.txt"));
        ReminderObject reminderRead = (ReminderObject) is.readObject();
        if(reminderRead!=null)
            Log.i("TAG", "Deserialized Reminder object is : "+reminderRead.toString());
        else{
            Log.i("TAG", "Null received");
        }
    } catch(ClassNotFoundException cnf){
        cnf.printStackTrace();
    } catch (FileNotFoundException e) {     
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

面临的例外情况:

03-31 23:47:59.246: W/System.err(12681): java.io.NotSerializableException: android.net.Uri$HierarchicalUri 03-31 23:47:59.246: W/System.err(12681): at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1364) 03-31 23:47:59.246: W/System.err(12681): at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671) 03-31 23:47:59.246: W/System.err(12681): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517) 03-31 23:47:59.246: W/System.err(12681): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481) 03-31 23:47:59.246: W/System.err(12681): at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:979) 03-31 23:47:59.246: W/System.err(12681): at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:368) 03-31 23:47:59.246: W/System.err(12681): at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1074) 03-31 23:47:59.246: W/System.err(12681): at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404) 03-31 23:47:59.246: W/System.err(12681): at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671) 03-31 23:47:59.246: W/System.err(12681): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517) 03-31 23:47:59.246: W/System.err(12681): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481) 03-31 23:47:59.246: W/System.err(12681): at com.navkar.navkarreminder.SetReminderActivity.scheduleReminder(SetReminderActivity.java:595)

请求帮助.

Answer 1

URI private Uri toneToPlay不可序列化。因此，有一种替代方法，您可以将数据类型 URI 更改为 String 并将您的 URI 转换为字符串并将字符串转换为 URI，反之亦然。

Uri 到字符串

Uri uri;
String stringUri;
stringUri = uri.toString();

字符串到 Uri

Uri uri;
String stringUri;
uri = Uri.parse(stringUri);

Answer 2

我认为问题是你保存问题的数据成员.

private Uri toneToPlay 是非序列化数据类型,您无法序列化它.