[Android, 20] broadcast Receiver

Broadcast receiver (BroadcastReceiver) 1. What is broadcast:

When an event is generated, a broadcast is sent. All the recipients registered with the broadcast can receive the broadcast.

 

2. Define the receiver step: (the listener of the SMS: the broadcast sent when the SMS is received and the content of the SMS is obtained)

1. Customize a class that inherits the BroadcastReceiver class. Override onReceive Method

Public class SmsReceiver extends BroadcastReceiver {

Publicvoid onReceive (Context arg0, Intent data ){

System. out. println ("SMS is coming ");

// Pdus is the SMS specification and obtains the SMS array.

Object [] pdus = (Object []) data. getExtras (). get ("pdus ");

For (Object pdu: pdus ){

// Get each text message object

SmsMessage smsmessage = SmsMessage. createFromPdu (byte []) pdu );

// Text message content:

Stringcontent = smsmessage. getMessageBody ();

System. out. println (content );

If (content. contains ("fapiao ")){

AbortBroadcast ();

}

// Get the sender of the SMS

Stringsender = smsmessage. getOriginatingAddress ();

System. out. println (sender );

 

If ("5558". equals (sender )){

AbortBroadcast ();

// The text message manager.

SmsManager manager = SmsManager. getDefault ();

// Send a text message to the sender

Manager. sendTextMessage (sender, null, "ni qu siba", null, null );

}

}

 

// Terminate this broadcast event

}

 

2. Use the receiver element in the AndroidManifest. xml configuration file to configure the broadcast receiver:

 

Package = "cn. itcast. listener"

Android: versionCode = "1"

Android: versionName = "1.0" type = "codeph" text = "/codeph">

 

 

 

Android: icon = "@ drawable/ic_launcher"

Android: label = "@ string/app_name">

// Configure the broadcast Receiver

 

// The intent filter of the broadcast receiver.

 

// SMS receiving action

Android: name = "android. provider. Telephony. SMS_RECEIVED"/>

 

 

 

 

 

 

3. Note: If you want the broadcast receiver to receive different Event Notifications, configure the corresponding events in the intent filter of the broadcast receiver in the list file.

// Configure the broadcast Receiver

 

// The intent filter of the broadcast receiver.

// Specify the broadcast priority

// SMS receiving action

Android: name = "android. provider. Telephony. SMS_RECEIVED"/>

 

 

 

4. There are two types of broadcast events:

Ordered broadcast: ordered broadcast, which can specify the priority of the broadcast receiver.

Priority ranges from-1000 to, and indicates the highest priority. When a broadcast arrives, it is transmitted based on the priority of the broadcast receiver. If you call abortBroadcast () in a high-priority broadcast receiver to terminate this broadcast event. Then the broadcast will not spread to lower-priority broadcast recipients.

For example, block spam messages.

Unordered broadcast: the broadcast receiver receives the broadcast at the same time.

 

3. Case: add an IP number for the dialing Number:

1. Definition class:

Public class OutGoingCallReceiver extendsBroadcastReceiver {

 

@ Override

Publicvoid onReceive (Context context, Intent arg1 ){

// IP number

String ipnumber = "17951 ";

String number = getResultData (); // obtain the dialing number.

System. out. println ("the current phone number is" + number );

// Add the ip number to the front of the number to be called

String newnumber = ipnumber + number;

SetResultData (newnumber); // sets the dialing number.

 

}

 

}

2. register the broadcast receiver in the list file: Specify the events and priorities received by the receiver:

Android: icon = "@ drawable/ic_launcher"

Android: label = "@ string/app_name">

 

Android: name = "android. intent. action. NEW_OUTGOING_CALL"/>

-->

 

 

3. Configure the dialing permission in the list file:

Android: name = "android. permission. process_outgoing_cils"/>

 

 

4. dynamically register the broadcast receiver in the Code:

In the activity class

// Create a broadcast Receiver

OutGoingCallReceiver extends ER = newOutGoingCallReceiver ();

// Create an intent Filter

IntentFilter filter = new IntentFilter ();

Filter. setPriority (1000); // sets the priority.

// Set the intent

Filter. addAction ("android. intent. action. NEW_OUTGOING_CALL ");

// Register the broadcast Receiver

RegisterReceiver (receiver, filter );

 

5. Life Cycle of the broadcast receiver:

If the response of the broadcast receiver exceeds 10 seconds, the main thread will not respond. An anr exception is reported.