[android-developers] issue with dynamic Multi selection alter dialog

hi there,

i wanted to create a dynamic multi selection alert dialog, currently
it only supports for hard coded values i think ?... i have tried
several ways and very much unsuccessful till now ..

i am fetching the values in JSON format and converting to JSONArray.
but how to input this to builder.setMultiChoiceItems, because it takes
only itemId from xml, cursor, or charsequence. i tried all ways i can
think of for chaging the array to charsequence.. eclipse did not
showed the error but app crashed in android throwing the cast
exception ...

below is the code, any help / suggestion would highly help !!
thankyou!.. (i am new to both java and andriod)

Button buttonFriends = (Button)
findViewById(R.id.buttonFriends);

JSONObject friends =
jObject.getJSONObject("friends");
JSONArray friendsArray =
friends.names();
CharSequence[] friendsNames = null;
for (int i=0; i <
friendsArray.length(); i++) {

if(friends.getString(friendsArray.getString(i)) != null) {
//friendsNames[i] =
friends.getString(friendsArray.getString(i));
}
}

buttonFriends.setOnClickListener(new
OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub

AlertDialog.Builder builder = new
AlertDialog.Builder(checkin.this);
builder.setTitle("Select your friends");
builder.setMultiChoiceItems(friendsNames, null, new
DialogInterface.OnMultiChoiceClickListener() {

@Override
public void onClick(DialogInterface arg0, int arg1,
boolean arg2) {
// TODO Auto-generated method stub

}
});
AlertDialog alert = builder.create();
alert.show();
}

});

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