Android简明开发教程二十：Broadcast Receiver 短信触发示例

Android 中BroadCast Receiver可以用来侦听广播事件。在使用Broadcast 之前，必须使用代码或是在AndroidManifest.xml进行注册。

下面的例子实现使用短信来触发AndroidGraphics2DTutorial中的示例。短信格式为：@demo:xxxx ,xxxx为 示例名称，比如， 启动Colors示例， 则向手机发送： @demo:Colors . 手机在收到短信后，先检测短信格式是否符合 @demo:xxxx, 若符合，这启动对应的示例。

在AndroidGraphics2DTutorial中添加一个自定义的Broadcast Receiver SmsMessageReceiver 用于监测接受到的短信：

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public class SmsMessageReceiver extends BroadcastReceiver {       private static final String queryString="@demo:";     @Override     public void onReceive(Context context, Intent intent) {         Bundle extras = intent.getExtras();         if (extras == null)             return;            Object[] pdus = (Object[]) extras.get("pdus");            for (int i = 0; i < pdus.length; i++) {             SmsMessage message = SmsMessage.createFromPdu((byte[]) pdus[i]);             String fromAddress = message.getOriginatingAddress();             String fromDisplayName = fromAddress;             String msg=message.getMessageBody();             if(msg.startsWith(queryString)){                // Trigger the main activity to fire up a dialog           //that shows/reads the received messages                 Intent di = new Intent();                 di.setClass(context, AndroidGraphics2DTutorial.class);                 di.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK                         | Intent.FLAG_ACTIVITY_SINGLE_TOP);                 di.putExtra(AndroidGraphics2DTutorial.SMS_FROM_ADDRESS_EXTRA,                         fromAddress);                 di.putExtra(AndroidGraphics2DTutorial.SMS_FROM_DISPLAY_NAME_EXTRA,                         fromDisplayName);                 di.putExtra(AndroidGraphics2DTutorial.SMS_MESSAGE_EXTRA, msg);                 context.startActivity(di);             }            }     } }

onReceive 会在Broadcast 事件发生是执行，这里检测短信内容，如果是以@demo:开头的，则启动AndroidGraphics2DTutorial Main Activity。

修改AndroidMainifest.xml

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<receiver android:name=".SmsMessageReceiver" android:enabled="true">             <intent-filter>                 <action android:name="android.provider.Telephony.SMS_RECEIVED" />             </intent-filter>  </receiver>

同时添加permission ，和Java ME类似Android某些API需要指定对应的Permission才可以使用。

1 2	<uses-permission android:name="android.permission.SEND_SMS" /> <uses-permission android:name="android.permission.RECEIVE_SMS" />

修改AndroidGraphics2DTutorial.java 来处理SMS消息：

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public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         Resources res = getResources();         String[] activity_Names = res.getStringArray(R.array.activity_name);         String[] activity_Infos = res.getStringArray(R.array.activity_info);         for(int i=0;i<activity_Names.length;i++){             ActivityInfo activityInfo=new ActivityInfo();             activityInfo.activityName=activity_Names[i];             activityInfo.activityInfo=activity_Infos[i];             activityInfo.iconIndex=R.drawable.icon1+i;             activityInfos.add(activityInfo);         }            aa=new ActivityInfoAdapter(this,R.layout.activitylist,activityInfos);         setListAdapter(aa);         Bundle bundle=getIntent().getExtras();         if(bundle!=null){              mFromAddress = bundle.getString(SMS_FROM_ADDRESS_EXTRA);              mMessage = bundle.getString(SMS_MESSAGE_EXTRA);              int index=mMessage.indexOf(queryString);              if(index>=0){                  String demoName=mMessage.substring(index+queryString.length());                  Intent intent = new Intent();                  intent.setClassName(this, packgeName+".example." +demoName);                  startActivity(intent);                 }            }     }

下面来测试，如果使用设备，则给手机发送@demo:Colors .
如果使用模拟器，则可以启动两个模拟器：

模拟器左上角数字5554，5556为模拟器的号码。发送@demo:Paths ,则自动触发Paths示例，如果AndroidGraphics2DTutorial没有运行，手机收到SMS短信后，会自动启动应用。