有一條短信pop up提醒（常駐BroadcastReceiver）

在AndroidManifest.xml文件向系統註冊一常駐的receiver，並設置這個receiver的intent-filter名稱爲android.provider.Telephony.SMS_RECEIVED,

這樣就可以讓該receiver對收到短信事件進行處理。

主activity

public class EX06_01 extends Activity 
{ 
  private TextView mTextView1; 
  /** Called when the activity is first created. */ 
  @Override 
  public void onCreate(Bundle savedInstanceState) 
  { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    /*透過findViewById建構巳建立TextView對象*/ 
    mTextView1 = (TextView) findViewById(R.id.myTextView1); 
    mTextView1.setText("等待接收短信..."); 
  }
}

一個繼承BroadcastReceiver的類

package irdc.EX06_01;

/*必需引用BroadcastReceiver類*/
import android.content.BroadcastReceiver; 
import android.content.Context; 
import android.content.Intent; 
import android.os.Bundle; 
/*必需引用telephoney.gsm.SmsMessage來收取短信*/
import android.telephony.SmsMessage; 
/*必需引用Toast類來監聽用戶收到短信*/
import android.widget.Toast; 

/* 自定義繼承自BroadcastReceiver類,監聽系統服務廣播的信息 */
public class EX06_01_SMSreceiver extends BroadcastReceiver 
{ 
   /*聲明靜態字符串,並使用android.provider.Telephony.SMS_RECEIVED作爲Action爲短信的依據*/
  private static final String mACTION = "android.provider.Telephony.SMS_RECEIVED"; 
  
  @Override 
  public void onReceive(Context context, Intent intent) 
  { 
    // TODO Auto-generated method stub 
    /* 判斷傳來Intent是否爲短信*/
    if (intent.getAction().equals(mACTION)) 
    { 
      /*建構一字符串集集合變量sb*/
      StringBuilder sb = new StringBuilder(); 
      /*接收由Intent傳來的數據*/
      Bundle bundle = intent.getExtras(); 
      /*判斷Intent是有資料*/
      if (bundle != null) 
      { 
        /* pdus爲 android內建短信參數 identifier
         * 透過bundle.get("")並傳一個包含pdus的對象*/
        Object[] myOBJpdus = (Object[]) bundle.get("pdus"); 
        /*建構短信對象array,並依據收到的對象長度來建立array的大小*/
        SmsMessage[] messages = new SmsMessage[myOBJpdus.length];  
        for (int i = 0; i<myOBJpdus.length; i++) 
        {  
          messages[i] = SmsMessage.createFromPdu ((byte[]) myOBJpdus[i]);  
        } 
          
        /* 將送來的短信合併自定義信息於StringBuilder當中 */  
        for (SmsMessage currentMessage : messages) 
        {  
          sb.append("接收到來告:\n");  
          /* 來訊者的電話號碼 */ 
          sb.append(currentMessage.getDisplayOriginatingAddress());  
          sb.append("\n------傳來的短信------\n");  
          /* 取得傳來訊息的BODY */  
          sb.append(currentMessage.getDisplayMessageBody());  
        }  
      }    
      /* 北Notification(Toase)顯示短信信息  */
      Toast.makeText(context, sb.toString(), Toast.LENGTH_LONG).show(); 
       
      /* 返並加Activity */ 
      Intent i = new Intent(context, EX06_01.class); 
      /*設定讓加Activity以一個新的task來執行*/
      i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
      context.startActivity(i); 
    } 
  } 
} 

AndroidManifest.xml文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="irdc.EX06_01"
  android:versionCode="1"
  android:versionName="1.0.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
    <activity android:name=".EX06_01"
      android:label="@string/app_name">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
    </activity>
     <!-- 建立receiver聆聽系統廣播訊息 -->
    <receiver android:name="EX06_01_SMSreceiver"> 
    <!-- 設定要捕捉的訊息名稱為provider中Telephony.SMS_RECEIVED -->
  <intent-filter> 
    <action 
      android:name="android.provider.Telephony.SMS_RECEIVED" /> 
  </intent-filter> 
    </receiver>   
</application>
<uses-sdk android:minSdkVersion="7" />
<uses-permission android:name="android.permission.RECEIVE_SMS"></uses-permission>
</manifest> 

佈局文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="irdc.EX06_01"
  android:versionCode="1"
  android:versionName="1.0.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
    <activity android:name=".EX06_01"
      android:label="@string/app_name">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
    </activity>
     <!-- 建立receiver聆聽系統廣播訊息 -->
    <receiver android:name="EX06_01_SMSreceiver"> 
    <!-- 設定要捕捉的訊息名稱為provider中Telephony.SMS_RECEIVED -->
  <intent-filter> 
    <action 
      android:name="android.provider.Telephony.SMS_RECEIVED" /> 
  </intent-filter> 
    </receiver>   
</application>
<uses-sdk android:minSdkVersion="7" />
<uses-permission android:name="android.permission.RECEIVE_SMS"></uses-permission>
</manifest>