Hi guys:
take a look at the following code:
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package com.demo.android.smsflowmeter;
import android.app.Activity;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
public class SMSFlowmeter extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setReceiver();
}
private SmsSentCounter smsSentObserver = new SmsSentCounter(new
Handler());
private int sms_sent_counter = 0;
private void setReceiver() {
this.getContentResolver().registerContentObserver(
Uri.parse("content://sms"), true,
smsSentObserver);
}
// wait to be implemented
class SmsSentCounter extends ContentObserver {
public SmsSentCounter(Handler handler) {
super(handler);
// TODO Auto-generated constructor stub
}
@Override
public void onChange(boolean selfChange) {
// TODO Auto-generated method stub
super.onChange(selfChange);
Cursor sms_sent_cursor =
SMSFlowmeter.this.managedQuery(Uri
.parse("content://sms"), null, "type=?",
new String[] { "2" }, null);
if (sms_sent_cursor != null) {
if (sms_sent_cursor.moveToFirst()) {
sms_sent_counter++;
Log.d("test", "" + sms_sent_counter);
}
}
}
}
}
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the code is pretty simple, but it really confused me a lot. since
theres just one Log.d() in the snippet and onChange() is invoked only
if changes occur in the uri "content://sms", so i think when i send an
sms, onChange() should be invoked only once. but when i run this app
on the emulator and tried to send a message from the emulator, the
Log.d() output twice most of the time, and only when the first sms was
sent or when i deleted all the sms and then sent an sms again, it may
output just once. thiss really strange i couldnt figure it out. is
this a bug or its just my fault or sth else? any clues and ideas are
welcome! Cheers, Lloyd.
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