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POHow to convert List<Object> to byte array using java or Android?
 

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  1. POHow to convert List<Object> to byte array using java or Android?
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    <p>im developing a app in Android. in this project im using a List of Objects and i need to convert the list object in byte array. but there is a null pointer exception shown in logcat? here is my coading.</p> <pre><code>class MyContact { String Name; Bitmap Image; String Number; public MyContact(String cName, String cNumber, Bitmap cImage) { Name = cName; Number = cNumber; Image = cImage; } public String getName() { return Name; } public void setName(String name) { Name = name; } public Bitmap getImage() { return Image; } public void setImage(Bitmap image) { Image = image; } public String getNumber() { return Number; } public void setNumber(String number) { Number = number; } } List&lt;MyContact&gt; list = new ArrayList&lt;MyContact&gt;(); </code></pre> <p>I added some values to the List object, using</p> <pre><code>MyContact contactObj = new MyContact(name, phoneNo, photo); list.add(contactObj); bla bla bla .... </code></pre> <p>and i need store the entire list object into the Android Mobiles local file. i used ,</p> <pre><code>FileOutputStream fos = openFileOutput( fileName, Context.MODE_PRIVATE); fos.write(toByteArray(MyTrackList)); // null pointer error occured here fos.close(); </code></pre> <p>here is a byte array conversion coding.</p> <pre><code>public static byte[] toByteArray (Object obj) { byte[] bytes = null; ByteArrayOutputStream bos = new ByteArrayOutputStream(); try { ObjectOutputStream oos = new ObjectOutputStream(bos); oos.writeObject(obj); oos.flush(); oos.close(); bos.close(); bytes = bos.toByteArray (); } catch (IOException ex) { //TODO: Handle the exception } return bytes; } </code></pre> <p>but returns null pointer exception in the line of above i marked in comment how can i resolve this problem. any suggestion? thanks in advance....</p>
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    1. USAmarnath
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