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:
- 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
- <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。
- <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:
- 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。