轉自http://www.cnblogs.com/xirihanlin/archive/2009/10/22/1588356.html
當裝置接收到一條新的SMS訊息時,就會廣播一個包含了android.provider.Telephony.SMS_RECEIVED動作的Intent。注意,這個動作是一個字串值,SDK
1.0不再包含對這個字串的引用,因此,在你的應用程式中,你需要顯式的指定它。
對於應用程式監聽SMS Intent廣播,首先需要添加RECEIVE_SMS許可權。通過在應用程式manifest中添加一個uses-permission,如下面的片段所示:
<uses-permission android:name=”android.permission.RECEIVE_SMS”/>
SMS廣播Intent包含了新來SMS的細節。為了提取封裝在SMS廣播Intent的Bundle中的SmsMessage對象數組,使用pdus
key來提取SMS pdus數組,其中,每個對象表示一個SMS訊息。將每個pdu位元組數組轉化成SmsMessage對象,調用SmsMessage.createFromPdu,傳入每個位元組數組,如下面的片段所示:
Bundle bundle = intent.getExtras();
if (bundle != null) {
Object[] pdus = (Object[]) bundle.get(“pdus”); //這個.get(“pdus”)中的pdus字元是固定的SMS
pdus數組,sdk裡看不到,需要在原始碼裡查看
SmsMessage[] messages = new SmsMessage[pdus.length];
for (int i = 0; i < pdus.length; i++)
messages[i] = SmsMessage.createFromPdu((byte[]) pdus[i]);
}
每個SmsMessage對象包含SMS 訊息的細節,包括源地址(手機號),時間和訊息體。
下面的例子示範了一個Broadcast Receiver實現了onReceive函數來檢查新來的簡訊是否以@echo字串開始,如果是,發送相同的文本給那個手機:
public class IncomingSMSReceiver extends BroadcastReceiver
{
private static final String queryString = “@echo “;
private static final String SMS_RECEIVED = “android.provider.Telephony.SMS_RECEIVED”; //這個在sdk裡也看不到,是監聽簡訊的必須要的,在原始碼裡看的到android-2.2-froyo/android/provider/Telephony.java
public void onReceive(Context _context, Intent _intent)
{
if (_intent.getAction().equals(SMS_RECEIVED))
{
SmsManager sms = SmsManager.getDefault();
Bundle bundle = _intent.getExtras();
if (bundle != null)
{
Object[] pdus = (Object[]) bundle.get(“pdus”);
SmsMessage[] messages = new SmsMessage[pdus.length];
for (int i = 0; i < pdus.length; i++)
messages[i] = SmsMessage.createFromPdu((byte[]) pdus[i]);
for (SmsMessage message : messages)
{
String msg = message.getMessageBody();
String to = message.getOriginatingAddress();
if (msg.toLowerCase().startsWith(queryString))
{
String out = msg.substring(queryString.length());
sms.sendTextMessage(to, null, out, null, null);
}
}
}
}
}
}
為了監聽簡訊,使用Intent Filter來註冊Broadcast
Receiver,使其監聽android.provider.Telephony.SMS_RECEIVED動作,如下面的片段所示:
final String SMS_RECEIVED = “android.provider.Telephony.SMS_RECEIVED”;
IntentFilter filter = new IntentFilter(SMS_RECEIVED);
BroadcastReceiver receiver = new IncomingSMSReceiver();
registerReceiver(receiver, filter);