android 使用广播 接收和拦截 android系统短信

package com.app.sms_broadcastreceiver;
 
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.telephony.gsm.SmsMessage;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MyReceiver extends Activity {
	public static final String SMS_ACTION = "android.provider.Telephony.SMS_RECEIVED"; 
	Button button1;
	TextView textView4,textView2; 
	Intent intent;
	BroadcastReceiver mReceiver;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main); 
	}
	@Override
	protected void onStart() {
		super.onStart();
		 //注册广播
		mReceiver = new MyReceiverSMS();
		IntentFilter filter  = new IntentFilter(SMS_ACTION);
		registerReceiver(mReceiver, filter);  
	}
	@Override
	protected void onStop() {
		super.onStop();
		//取消广播
		unregisterReceiver(mReceiver);
	} 
	
	/**
	 * 内部类
	 * @author Administrator
	 *
	 */
	  class MyReceiverSMS extends BroadcastReceiver{
			@Override
			public void onReceive(Context context, Intent intent) {
				if(intent.getAction().equals(MyReceiver.SMS_ACTION)){
					Toast.makeText(context, "监测到系统短信", Toast.LENGTH_SHORT).show();
					//获取intent参数
					Bundle bundle=intent.getExtras();
					//判断bundle内容
					if (bundle!=null) {
						//获得并解析短信
						Object[] pdus=(Object[])bundle.get("pdus");//取 pdus内容
						SmsMessage[] messages = new SmsMessage[pdus.length];//解析短信
						//获取短信内容 显示到控件
						textView2 =(TextView)findViewById(R.id.textView2);
						textView4 =(TextView)findViewById(R.id.textView4);
						for(int i=0;i<messages.length;i++)
						{
							byte[] pdu=(byte[])pdus[i];
							messages[i]=SmsMessage.createFromPdu(pdu);   
							textView2.setText(messages[0].getDisplayOriginatingAddress().toString());
							textView4.setText(messages[0].getDisplayMessageBody().toString());
						}     
						 //取消系统短信广播
                        abortBroadcast();
					} 
				} 
			} 
		} 
}