拦截短信示例1

广播有两种不同的类型：普通广播（normal broadcasts）和有序广播（ordered broadcasts）。普通广播是完全异步的，可以被所有的接收者接收到，并且接收者无法终止广播的传播。然而有序广播是按照接收者声明的优先级别，被接收者依次接收到。优先级别声明在 intent-filter 元素的 android:priority 属性中，数越大优先级别越高，取值范围:-1000到1000，优先级别也可以调用IntentFilter对象的setPriority()进行设置。有序广播的接收者可以终止广播Intent的传播，广播Intent的传播一旦终止，后面的接收者就无法接收到广播。

发送普通广播，所有订阅者都有机会获得并进行处理：

Context.sendBroadcast()

发送有序广播，系统会根据接收者声明的优先级别按顺序逐个执行接收者：

Context.sendOrderedBroadcast()

本示例将smsReceiver的优先级设为1000，拦截短信

public class MsgReceiver extends BroadcastReceiver {

    public static final String SMS_RECEIVED_ACTION = "android.provider.Telephony.SMS_RECEIVED";
    static String tag = "SmsDemo";

    @Override
    public void onReceive(Context context, Intent intent) {

        String action = intent.getAction();
        if (SMS_RECEIVED_ACTION.equals(action)) {
            Bundle bundle = intent.getExtras();
            if (bundle != null) {
                Object[] pdus = (Object[]) bundle.get("pdus");
                for (Object pdu : pdus) {
                    SmsMessage message = SmsMessage.createFromPdu((byte[]) pdu);
                    String msg = "拦截到短信：\n来自："
                            + message.getOriginatingAddress() + "\n内容："
                            + message.getMessageBody();
                    Toast.makeText(context, msg, Toast.LENGTH_LONG).show();
                    abortBroadcast();
                }
            }
        }
    }
}

注册MsgReceiver

        MsgReceiver receiver = new MsgReceiver();
        IntentFilter filter = new IntentFilter();
        filter.setPriority(1000); 
        filter.addAction(MsgReceiver.SMS_RECEIVED_ACTION);
        registerReceiver(receiver, filter);