回调监听器总是返回null

• Z时代
• 2024-01-10
• 分类：问答

我正在尝试为Android创建一个简单的SMS库，并为其创建了一些自定义监听器。我想在事件发生时触发该监听器，例如。短信发送或失败。我能够发送和接收短信，但监听器事件没有被调用，因为我的监听器总是返回空值。有人可以告诉我我在哪里做错了吗？回调监听器总是返回null

public class SendSMS { 
    private OnSMSListener listener; 
    public void OnSMSListener(OnSMSListener listener) { 
     this.listener = listener; 
    } 
    public SendSMS(Context context) { 
     Holder.setContext(context); 
     this.listener = null; 
    } 
    public void setNumber(String number) { 
     Holder.setMobNumber(number); 
    } 
    public void setMessage(String message) { 
     Holder.setMessage(message); 
    } 
    public void sendMessage() { 
     ImplSendSms.sendTextMessage(listener); 
    } 
    /** 
    * Interface definition for a callback to be invoked 
    */ 
    public interface OnSMSListener { 
     void onSmsSent(); 
     void onGenericFailure(); 
     void onNoService(); 
     void onNullPdu(); 
     void onRadioOff(); 
    } 

MyImplSendSms.class文件：

public class ImplSendSms { 
    public static void sendTextMessage(final SendSMS.OnSMSListener listener) { 
     Toast.makeText(Holder.getContext(), "sendTextMessage", Toast.LENGTH_SHORT).show(); 
     String SENT = "SMS_SENT"; 
     PendingIntent sentPI = PendingIntent.getBroadcast(Holder.getContext(), 0, 
       new Intent(SENT), 0); 
//---when the SMS has been sent--- 
     Holder.getContext().registerReceiver(new BroadcastReceiver() { 
      @Override 
      public void onReceive(Context arg0, Intent arg1) { 
       switch (getResultCode()) { 
        case Activity.RESULT_OK: 
         Toast.makeText(Holder.getContext(), "Inside Sent", Toast.LENGTH_SHORT).show(); 
         if (listener != null) { 
          Toast.makeText(Holder.getContext(), "Inside Sent Listener", Toast.LENGTH_SHORT).show(); 
          listener.onSmsSent(); 
         } 
         break; 
        case SmsManager.RESULT_ERROR_GENERIC_FAILURE: 
         if (listener != null) { 
          listener.onGenericFailure(); 
         } 
         break; 
        case SmsManager.RESULT_ERROR_NO_SERVICE: 
         if (listener != null) { 
          listener.onNoService(); 
         } 
         break; 
        case SmsManager.RESULT_ERROR_NULL_PDU: 
         if (listener != null) { 
          listener.onNullPdu(); 
         } 
         break; 
        case SmsManager.RESULT_ERROR_RADIO_OFF: 
         if (listener != null) { 
          listener.onRadioOff(); 
         } 
         break; 
       } 
      } 
     }, new IntentFilter(SENT)); 
     SmsManager sms = SmsManager.getDefault(); 
     sms.sendTextMessage(Holder.getMobNumber(), null, Holder.getMessage(), sentPI, null); 
    } 

我的MainActivity

SendSMS sms = new SendSMS(MainActivity.this); 
     sms.setMessage("Hello"); 
     sms.setNumber("123456789"); 
     sms.sendMessage(); 
     sms.OnSMSListener(new SendSMS.OnSMSListener() { 
      @Override 
      public void onSmsSent() { 
       Toast.makeText(MainActivity.this, "SMS Sent", Toast.LENGTH_SHORT).show(); 
      } 
      @Override 
      public void onGenericFailure() { 
       Toast.makeText(MainActivity.this, "Generic Failure", Toast.LENGTH_SHORT).show(); 
      } 
      @Override 
      public void onNoService() { 
       Toast.makeText(MainActivity.this, "No Service", Toast.LENGTH_SHORT).show(); 
      } 
      @Override 
      public void onNullPdu() { 
       Toast.makeText(MainActivity.this, "Null PDU", Toast.LENGTH_SHORT).show(); 
      } 
      @Override 
      public void onRadioOff() { 
       Toast.makeText(MainActivity.this, "Radio Off", Toast.LENGTH_SHORT).show(); 
      } 
     }); 

回答：

sms.OnSMSListener(new SendSMS.OnSMSListener() { 
     @Override 
     public void onSmsSent() { 
      Toast.makeText(MainActivity.this, "SMS Sent", Toast.LENGTH_SHORT).show(); 
     } 
     @Override 
     public void onGenericFailure() { 
      Toast.makeText(MainActivity.this, "Generic Failure", Toast.LENGTH_SHORT).show(); 
     } 
     @Override 
     public void onNoService() { 
      Toast.makeText(MainActivity.this, "No Service", Toast.LENGTH_SHORT).show(); 
     } 
     @Override 
     public void onNullPdu() { 
      Toast.makeText(MainActivity.this, "Null PDU", Toast.LENGTH_SHORT).show(); 
     } 
     @Override 
     public void onRadioOff() { 
      Toast.makeText(MainActivity.this, "Radio Off", Toast.LENGTH_SHORT).show(); 
     } 
    }); 
    sms.sendMessage(); 

以上是 回调监听器总是返回null 的全部内容， 来源链接： utcz.com/qa/265115.html