问题
I am trying to call notifyDataSetChanged() on my custom adapter but it seems not to be working.
Here is my activity :-
public class ThreadData extends ListActivity
{
private static final Uri SMS_URI = Uri.parse("content://sms");
HashMap<Long, BodyType> bodies = new HashMap<Long, BodyType>();
private String name, number;
private ListView listView;
private Activity activity;
ThreadDataAdapter adapter;
Handler handler;
private Context context;
private static final String PHONE_NUMBER_SEPARATORS = " ()-./";
static HashMap<String, ContactInfo.ContactDetail> info = new HashMap<String, ContactInfo.ContactDetail>();
public void onCreate(Bundle bundle)
{
super.onCreate(bundle);
setContentView(R.layout.chats);
Bundle extras = getIntent().getExtras();
activity = this;
context = this;
if(extras != null)
{
number = extras.getString("address");
ContactInfo.ContactDetail nameInfo = getContactsDetailWithNumber(number);
if(nameInfo != null)
{
name = nameInfo.name;
}
else
{
name = number;
}
}
TextView person = (TextView) findViewById(R.id.chat_person);
person.setText(name);
ImageButton callPerson = (ImageButton) findViewById(R.id.call_person);
callPerson.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
popUpDialerAlert();
}
});
buildMessageList();
ArrayList<BodyType> items = sortBodies();
adapter = new ThreadDataAdapter(this, items);
listView = getListView();
listView.setAdapter(adapter);
listView.setStackFromBottom(true);
getContentResolver().registerContentObserver(SMS_URI, true, new MyContentObserver(handler));
}
public void buildMessageList()
{
Cursor cursor = getContentResolver().query(SMS_URI, null, null, null, "date ASC");
startManagingCursor(cursor);
while (cursor.moveToNext())
{
BodyType bodyInfo = new BodyType();
String address = cursor.getString(cursor.getColumnIndex("address"));
bodyInfo.body = cursor.getString(cursor.getColumnIndexOrThrow("body"));
Long date = cursor.getLong(cursor.getColumnIndexOrThrow("date"));
bodyInfo.date = date;
String type = cursor.getString(cursor.getColumnIndexOrThrow("type"));
if(type.equals("1"))
{
bodyInfo.type = "received";
}
else if(type.equals("2"))
{
bodyInfo.type = "sent";
}
else if(type.equals("3"))
{
bodyInfo.type = "draft";
}
String number = filterPhoneNumber(address);
ContactInfo.ContactDetail nameInfo = getContactsDetailWithNumber(number);
String personName = number;
if(nameInfo != null)
{
personName = nameInfo.name;
}
else
{
personName = number;
}
if(personName.equals(name))
{
bodies.put(date, bodyInfo);
}
}
}
public void popUpDialerAlert()
{
AlertDialog.Builder dialerAlert = new AlertDialog.Builder(this);
dialerAlert.setTitle("Confirm");
dialerAlert.setMessage("Call" + " " + name + "?");
dialerAlert.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialogInterface, int i) {
Uri uri = Uri.parse("tel:" + number);
Intent intent = new Intent((Intent.ACTION_CALL));
intent.setData(uri);
context.startActivity(intent);
}
});
dialerAlert.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialogInterface, int i) {
}
});
dialerAlert.show();
}
public ArrayList<BodyType> sortBodies()
{
ArrayList<Long> dates = new ArrayList<Long>(bodies.keySet());
Collections.sort(dates);
ArrayList<BodyType> items = new ArrayList<BodyType>();
for(Long date : dates)
{
for(Long key : bodies.keySet())
{
if(date.equals(key))
{
items.add(bodies.get(key));
}
}
}
return items;
}
public void printBodies(ArrayList<BodyType> items)
{
for(BodyType bodyType : items)
{
log(bodyType.date.toString());
log(bodyType.body);
log(bodyType.type);
}
}
static class BodyType
{
public String type;
public String body;
public Long date;
}
public static ContactInfo.ContactDetail getContactsDetailWithNumber(String number)
{
if(info.containsKey(number))
{
return info.get(number);
}
return null;
}
public static String filterPhoneNumber(String phoneNumber)
{
if (phoneNumber == null)
{
return null;
}
int length = phoneNumber.length();
StringBuilder builder = new StringBuilder(length);
for (int i = 0; i < length; i++)
{
char character = phoneNumber.charAt(i);
if (PHONE_NUMBER_SEPARATORS.indexOf(character) == -1)
{
builder.append(character);
}
}
return builder.toString();
}
public class MyContentObserver extends ContentObserver
{
public MyContentObserver(Handler handler)
{
super(handler);
}
@Override
public void onChange(boolean selfChange)
{
buildMessageList();
adapter.notifyDataSetChanged();
super.onChange(selfChange);
}
}
public void log(String msg)
{
Log.e("ThreadData", msg);
}
}
Here is my custom adapter :-
public class ThreadDataAdapter extends BaseAdapter
{
Activity activity;
ArrayList<ThreadData.BodyType> data;
LayoutInflater inflater;
public ThreadDataAdapter(Activity a, ArrayList<ThreadData.BodyType> list)
{
activity = a;
data = list;
inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return data.size(); //To change body of implemented methods use File | Settings | File Templates.
}
public Object getItem(int i) {
return data.get(i); //To change body of implemented methods use File | Settings | File Templates.
}
public long getItemId(int i) {
return i; //To change body of implemented methods use File | Settings | File Templates.
}
public static class ViewHolder
{
public TextView message;
}
public View getView(int i, View view, ViewGroup viewGroup)
{
View row = view;
final ViewHolder holder;
ThreadData.BodyType bodyInfo = data.get(i);
if(bodyInfo.type.equals("sent"))
{
Log.e("MMS", bodyInfo.body);
row = inflater.inflate(R.layout.sentitem, viewGroup, false);
holder = new ViewHolder();
holder.message = (TextView)row.findViewById(R.id.sent);
holder.message.setText(bodyInfo.body);
}
else
{
row = inflater.inflate(R.layout.chatitems, viewGroup, false);
holder = new ViewHolder();
holder.message = (TextView)row.findViewById(R.id.received);
holder.message.setText(bodyInfo.body);
}
return row;
}
@Override
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
}
}
What i am trying to do is, i am registering a ContentObserver and calling notifyDataSetChanged() in its onChange() whenever there is some change in device's SMS database. But it isn't working at all.
Any help would be appreciated. Please HELP!
Thanks in advance.
回答1:
The List you use in your adapter (data) is a reference on a List that you create in sortBodies. It is never updated. Thus your adapter is stuck on a copy of items that is not updated by your OnChange method.
In other words, whether or not OnChange is called, getView will always return the same views...
You adapter should use bodies, as this MashMap is updated by your OnChange method.
来源：https://stackoverflow.com/questions/6482984/android-notifydatasetchanged-not-working-on-custom-adapter