android - 如何在主要活动中注册接收者？

Question

我有一个SmsReceiver班级，我想在主要活动中注册，我应该怎么做？

我是安卓新手。

Answer 1

你可以做两件事：

1. BroadcastReceiver在中创建和定义Manifest
2. 创建并注册BroadcastReceiverin 代码。

对于选项 2（您要问的）：

创建一个BroadcastReceiverin 代码 (MyBroadcastReceiver)。在您的范围内声明 MyBroadcastReceiver Activity：

MyBroadcastReceiver mMyBroadcastReceiver;

BroadcastReceiver通过以下方式注册Activity：

IntentFilter filter = new IntentFilter(android.provider.Telephony.SMS_RECEIVED);
this.registerReceiver(mMyBroadcastReceiver, filter);

Answer 2

要让服务接收 SMS 消息，请执行以下步骤：

1. 更新清单以授予您的应用接收短信的权限（WRITE_SMS、READ_SMS、RECEIVE_SMS）
2. 不要使用接收者意图过滤器更新清单！（每个在线示例代码似乎都这样做）

3. 在您的服务中，在您的服务类中创建一个嵌套的广播接收器类

   private class SMSreceiver extends BroadcastReceiver
   {
       private final String TAG = this.getClass().getSimpleName();
   
       @Override
       public void onReceive(Context context, Intent intent)
       {
           Bundle extras = intent.getExtras();
   
           String strMessage = "";
   
           if ( extras != null )
           {
               Object[] smsextras = (Object[]) extras.get( "pdus" );
   
               for ( int i = 0; i < smsextras.length; i++ )
               {
                   SmsMessage smsmsg = SmsMessage.createFromPdu((byte[])smsextras[i]);
   
                   String strMsgBody = smsmsg.getMessageBody().toString();
                   String strMsgSrc = smsmsg.getOriginatingAddress();
   
                   strMessage += "SMS from " + strMsgSrc + " : " + strMsgBody;                    
   
                   Log.i(TAG, strMessage);
               }
   
           }
   
       }
   
   }
   

4. 在您的服务类中，注册以接收 android.provider.Telephony.SMS_RECEIVED意图过滤器：

   public class ServiceCommunicator extends Service
   {
       private SMSreceiver mSMSreceiver;
       private IntentFilter mIntentFilter;
   
       @Override
       public void onCreate()
       {
           super.onCreate();
   
           //SMS event receiver
           mSMSreceiver = new SMSreceiver();
           mIntentFilter = new IntentFilter();
           mIntentFilter.addAction("android.provider.Telephony.SMS_RECEIVED");
           registerReceiver(mSMSreceiver, mIntentFilter);
       }
   
       @Override
       public void onDestroy()
       {
           super.onDestroy();
   
           // Unregister the SMS receiver
           unregisterReceiver(mSMSreceiver);
       }
   }
   

就是这样 ！

注意： 如果您想知道为什么我没有从单独的 BroadcastReceiver 类中绑定到我的服务 - 它不起作用，因为bindService()它不可用。

Answer 3

对于 API 级别 19 及以上

 IntentFilter smsFilter = new IntentFilter();
 smsFilter.addAction(Telephony.Sms.Intents.SMS_RECEIVED_ACTION);
registerReceiver(this.receiver, filter);

Answer 4

正如你所要求的那样在你的BroadcastReceiver里面注册MainActivityregisterReceiver-codewise-inside-MainActivity

这是代码的样子==>

public class MainActivity extends Activity 
{
BroadcastReceiver smsReceiver;
private IntentFilter myFilter = new IntentFilter(android.provider.Telephony.SMS_RECEIVED);

   protected void onCreate(Bundle savedInstanceState) 
   {
    super.onCreate(savedInstanceState);
    registerReceiver(smsReceiver, myFilter); // register BroadCastReceiver at time of initialization of Activity with proper Intent-Filter
   }

@Override
  protected void onPause() 
   {
    unregisterReceiver(smsReceiver); // UnRegister BroadCastReceiver as you no longer have your activity at Foreground -- Saving CPU & Battery Drainage
    super.onPause();
   }

 @Override
   protected void onResume() 
   {
    registerReceiver(smsReceiver, myFilter); // Register BroadCastReceiver Once again as your activity comes from pause to forground state again.
    super.onResume();
   }

  smsReceiver = new BroadcastReceiver() //Implementation of your BroadCastReceiver
  {

    @Override
    public void onReceive(Context context, Intent intent)
    {
       // Do whatever you like as sms is received and caught by these BroadCastReceiver
        Toast.makeText(context, "SMS Received", Toast.LENGTH_LONG).show();          
    }
  };
 }

Answer 5

private BroadcastReceiver receiver = new BroadcastReceiver() {

   @Override
   public void onReceive(Context context, Intent intent) {
       //some action
   }
};

IntentFilter filter = new IntentFilter("YOUR_ACTION");
registerReceiver(receiver, filter);

希望这可以帮助