我正在创建短信应用。我正在使用我的应用程序发送和接收SMS，然后可以在ListView中显示它们。但是，一旦发送或接收短信，listview就不会更新。我必须按下后退按钮，之后如果我再次进入ListView Activity，则会显示新的短信。
如果短信到达或发送后如何自动刷新列表视图？
代码是：
public class ChatActivity extends ListActivity {
private MyListAdapter adapter;
ArrayList<String> item_id = new ArrayList<String>();
ArrayList<String> item_phone_num = new ArrayList<String>();
ArrayList<String> item_msg_body = new ArrayList<String>();
ArrayList<String> item_time = new ArrayList<String>();
ArrayList<String> item_flag = new ArrayList<String>();
ArrayList<String> items = new ArrayList<String>();
private Button btn_send;
DbManager manager;
Cursor Cursor;
ViewHolder holder12;
String contact_for_chat;
String contact_no;
String message_body = "";
Calendar c;
SimpleDateFormat sdf;
String time;
EditText et_chat;
String flag;
String msg = "";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Bundle bundle = getIntent().getExtras();
contact_for_chat = bundle.getString("contact_name");
contact_for_chat = contact_for_chat.replace(" ", "");
contact_no = Util.getContactNumber(contact_for_chat, ChatActivity.this);
Toast.makeText(getApplicationContext(), contact_no, Toast.LENGTH_LONG).show();
final ViewHolder holder = new ViewHolder();
manager = new DbManager(this);
Cursor = manager.Return_All(contact_no);
showEvents(Cursor);
c = Calendar.getInstance();
sdf = new SimpleDateFormat("dd:MMMM:yyyy HH:mm:ss a");
time = sdf.format(c.getTime());
setActionBar();
findViewsById();
adapter = new MyListAdapter(this);
adapter.notifyDataSetChanged();
setListAdapter(adapter);
btn_send = (Button) findViewById(R.id.button1);
btn_send.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
SendSMS();
}
});
}
protected void SendSMS() {
SmsManager sms_manager = SmsManager.getDefault();
message_body = et_chat.getText().toString();
ArrayList<String> parts = sms_manager.divideMessage(message_body);
sms_manager.sendMultipartTextMessage(contact_no, null, parts, null, null);
flag = "1";
manager.Insert_sms_data(time, contact_no, message_body,flag);
msg+= "SMS to :" + contact_for_chat + " \n";
msg += "having number:" + contact_no + " \n";
msg += "as" +message_body + " \n";
msg += "at"+ time + " \n";
Toast.makeText(getApplicationContext(), ""+msg , Toast.LENGTH_LONG).show();
}
private void setActionBar() {
ActionBar mActionBar = getActionBar();
mActionBar.setDisplayHomeAsUpEnabled(false);
mActionBar.setDisplayShowTitleEnabled(false);
LayoutInflater mInflater = LayoutInflater.from(this);
View mCustomView = mInflater.inflate(R.layout.actionbar_chat, null);
TextView tv_chat = (TextView)mCustomView.findViewById(R.id.title_text);
tv_chat.setText(contact_for_chat);
ColorDrawable colorDaawable = new ColorDrawable(Color.parseColor("#CFCFC4"));
mActionBar.setBackgroundDrawable(colorDaawable);
mActionBar.setLogo(R.drawable.ic_launcher);
mActionBar.setDisplayHomeAsUpEnabled(true);
mActionBar.setCustomView(mCustomView);
mActionBar.setDisplayShowCustomEnabled(true);
}
private void findViewsById() {
et_chat = (EditText)findViewById(R.id.et_chat);
btn_send = (Button)findViewById(R.id.btn_send);
}
private void showEvents(Cursor cursor) {
item_id = new ArrayList<String>(cursor.getCount());
item_phone_num = new ArrayList<String>(cursor.getCount());
item_msg_body = new ArrayList<String>(cursor.getCount());
item_time = new ArrayList<String>(cursor.getCount());
item_flag = new ArrayList<String>(cursor.getCount());
int i=0;
while (cursor.moveToNext()) {
item_id.add(i+"");
item_time.add(cursor.getString(1));
item_msg_body.add(cursor.getString(3));
item_phone_num.add(cursor.getString(2));
item_flag.add(cursor.getString(4));
i++;
}
}
public class MyListAdapter extends BaseAdapter {
Context con;
private LayoutInflater layoutinf;
ArrayList<Boolean> itemChecked = new ArrayList<Boolean>();
ArrayList<String> items_ = new ArrayList<String>();
public MyListAdapter(ChatActivity context) {
con = context;
}
public int getCount() {
return item_id.size();
}
public Object getItem(int position) {
return item_id.size();
}
public long getItemId(int position) {
return item_id.get(position).hashCode();
}
public View getView(final int position, View arg1, ViewGroup arg2) {
View v = arg1;
ViewHolder holder = null;
if (v == null) {
layoutinf = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = layoutinf.inflate(R.layout.row_chat, null);
holder = new ViewHolder();
holder.tv_contact = (TextView) v.findViewById(R.id.phone_num);
holder.tv_sms_body = (TextView) v.findViewById(R.id.msg_body);
holder.tv_time = (TextView) v.findViewById(R.id.time);
v.setTag(holder);
} else {
holder = (ViewHolder) v.getTag();
}
if(item_flag.get(position).equals("1"))
{
holder.tv_sms_body.setBackgroundResource(R.drawable.bubble_green);
}
else
{
holder.tv_sms_body.setBackgroundResource(R.drawable.bubble_yellow);
}
holder.tv_contact.setText("" + item_phone_num.get(position));
holder.tv_sms_body.setText(item_msg_body.get(position));
holder.tv_time.setText(item_time.get(position));
return v;
}
}
public class ViewHolder {
private TextView tv_contact;
private TextView tv_sms_body;
private TextView tv_time;
}
}
答案 0 :(得分：1)
您应该注册一个广播接收器，以便在收到短信时收到通知，并且在接收方的onReceive中，您可以从光标获取新数据并刷新列表视图。
要了解有关接收器尝试的更多信息：
答案 1 :(得分：0)
您必须使用notifydatasetchanged。查看以下链接。
https://stackoverflow.com/a/12229903/2930834