使用广播接收器接收短信时应用程序崩溃Android Studio

Question

我正在制作一个应用程序，它可以读取传入的短信，然后检索文本短信以将其写入我的活动的edittext中。使用短信验证代码时，我的应用就像Whatsapp。当持有验证文本代码的活动仍在运行时，应用程序正常运行，但当活动未运行（活动完成）时，应用程序在传入短信时会崩溃。 请帮助我，我一直有这个问题很长一段时间，它还没有得到解决。非常感谢你的帮助。 我得到这样的错误信息，

java.lang.RuntimeException: Unable to start receiver com.rental.roby.okkarent.aplikasi.helper.SmsReceiver: java.lang.NullPointerException 

at android.app.ActivityThread.handleReceiver(ActivityThread.java:2590) 
at android.app.ActivityThread.access$1700(ActivityThread.java:151) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1342) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:136) 
at android.app.ActivityThread.main(ActivityThread.java:5421) 
at java.lang.reflect.Method.invokeNative(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:515) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:979) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:795) 
at dalvik.system.NativeStart.main(Native Method) 

Caused by: java.lang.NullPointerException 
at com.rental.roby.okkarent.aplikasi.helper.SmsReceiver.onReceive(SmsReceiver.java:40) 
at android.app.ActivityThread.handleReceiver(ActivityThread.java:2571) 
at android.app.ActivityThread.access$1700(ActivityThread.java:151)  
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1342)  
at android.os.Handler.dispatchMessage(Handler.java:102)  
at android.os.Looper.loop(Looper.java:136)  
at android.app.ActivityThread.main(ActivityThread.java:5421)  
at java.lang.reflect.Method.invokeNative(Native Method)  
at java.lang.reflect.Method.invoke(Method.java:515)  
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:979) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:795)  
at dalvik.system.NativeStart.main(Native Method)  

这是我的广播接收器的代码，

public class SmsReceiver extends BroadcastReceiver { 

    private static SmsListener mListener; 

    @Override 
    public void onReceive(Context context, Intent intent) { 
     Bundle data = intent.getExtras(); 

     Object[] pdus = (Object[]) data.get("pdus"); 

     for(int i=0;i<pdus.length;i++){ 
      SmsMessage smsMessage = SmsMessage.createFromPdu((byte[]) pdus[i]); 

      String sender = smsMessage.getDisplayOriginatingAddress(); 
      //You must check here if the sender is your provider and not another one with same text. 

      String messageBody = smsMessage.getMessageBody(); 
      String verificationCode = getVerificationCode(messageBody); 

      //Pass on the text to our listener. 
      Log.d("","--------------------------------------------------------"+context); 
      if(verificationCode != null){ 
        // Toast.makeText(context, verificationCode, Toast.LENGTH_LONG).show(); 
        mListener.messageReceived(verificationCode); 
      } 
     } 

    } 


    public static void bindListener(SmsListener listener) { 
     mListener = listener; 
    } 
    private String getVerificationCode(String message) { 
     String code = null; 
     int index = message.indexOf(":"); 


     if (index != -1) { 
      int start = index + 2; 
      int length = 4; 
      code = message.substring(start, start + length); 
      return code; 
     } 

     return code; 
    } 
} 

这是接口，

public interface SmsListener { 

     public void messageReceived(String messageText); 

} 

最后，在我的活动，我像这样添加代码来自动编写验证码，

public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.fom_verifikasi); 


     // asking for sms code verification, 
     get_verification_code(no_hp); 

     // catch incoming sms 
     SmsReceiver.bindListener(new SmsListener() { 
      @Override 
      public void messageReceived(String messageText) { 
       //Log.d("Text",messageText); 
       // write verficaation code to edittext 
       kode.setText(messageText); 
      } 
     }); 



    } 

这是明显的，

<receiver android:name="com.rental.roby.okkarent.aplikasi.helper.SmsReceiver"> 
      <intent-filter> 
       <action android:name="android.provider.Telephony.SMS_RECEIVED" /> 
      </intent-filter> 
     </receiver> 

Answer 1

有时短信包是空的过程之前，因此，应检查，这样

public void onReceive(Context context, Intent intent) { 

    // Retrieves a map of extended data from the intent. 
    final Bundle bundle = intent.getExtras(); 

    try { 

     if (bundle != null) { 

      final Object[] pdusObj = (Object[]) bundle.get("pdus"); 

      for (int i = 0; i < pdusObj.length; i++) { 

       SmsMessage currentMessage = SmsMessage.createFromPdu((byte[]) pdusObj[i]); 
       String phoneNumber = currentMessage.getDisplayOriginatingAddress(); 
       String message = currentMessage.getDisplayMessageBody(); 

       // 
      } 
     } 

    } catch (Exception e) { 

    } 
}