我正在开发一个短信聊天应用程序。我想知道当活动打开时如何在列表视图底部添加最新的短信（发送或接收），就像股票短信应用程序或任何其他信使一样。
我尝试使用 ContentObserver。一旦 SMS 数据库发生一些变化，我就尝试使用新的数据集重新加载 ListView，但它不起作用。每次看到新的短信（发送接收）我都必须重新启动应用程序，以便重新加载列表。我希望这些新消息在我发送或接收它们后立即显示在聊天窗口中，就像我们通过 gtalk、msn 或任何 SMS 应用程序聊天的方式一样。
这是我的代码：-
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;
ArrayList<BodyType> items;
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;
listView = getListView();
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();
items = sortBodies(bodies);
adapter = new ThreadDataAdapter(this, items);
listView.setAdapter(adapter);
listView.setStackFromBottom(true);
getContentResolver().registerContentObserver(SMS_URI, true, new MyContentObserver(handler));
//Intent intent = new Intent(this, RBSMSService.class);
//startService(intent);
}
public void loadListView()
{
items.clear();
items = sortBodies(bodies);
adapter = new ThreadDataAdapter(this, items);
listView.setAdapter(adapter);
listView.setStackFromBottom(true);
}
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(HashMap<Long, BodyType> bodies)
{
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)
{
bodies.clear();
buildMessageList();
items = sortBodies(bodies);
runOnUiThread(new Runnable() {
public void run() {
loadListView();
}
});
super.onChange(selfChange);
}
}
public void log(String msg)
{
Log.e("ThreadData", msg);
}
}
请帮忙！
谢谢