How to register broadcast receiver?

Question

Here is my source code and it keeps force closing everytime I run it...

public class MainActivity extends Activity {
    private static String content;
    p         


        

Answer 1

The force close is likely happening because you are managing the UI from within your broadcast receiver. There's a 10-second limit on a BR's onReceive before it is forced closed.

To solve, use an Activity component to generate your Toast.

Answer 2

You need to move your receiver outside the onCreate. something like -

public class MainActivity extends Activity {
private static String content;
private static String phone;
private String number;
private String message;

private  BroadcastReceiver receiver =  new BroadcastReceiver(){

    @Override
    public void onReceive(Context context, Intent intent) {
        //---get the SMS message passed in---
        Bundle bundle = intent.getExtras();        
        SmsMessage[] msgs = null;

        if (bundle != null)
        {
            number = "";
             message = "";
            //---retrieve the SMS message received---
            Object[] pdus = (Object[]) bundle.get("pdus");
            msgs = new SmsMessage[pdus.length];            
            for (int i=0; i<msgs.length; i++){
                msgs[i] = SmsMessage.createFromPdu((byte[])pdus[i]);                
                number = msgs[i].getOriginatingAddress();                     

               message = msgs[i].getMessageBody();


            }
            //---display the new SMS message--- 
            Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
            SendMe();
    }
    }


  };

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    IntentFilter filter = new IntentFilter();
    filter.addAction(YOUR_SMS_ACTION);
    this.registerReceiver(this.receiver, filter);
    setContentView(R.layout.main);
    }


public void SendMe(){


    PendingIntent pi =  PendingIntent.getActivity(this, 0,
                new Intent(this, MainActivity.class), 0);  
    SmsManager sms = SmsManager.getDefault();
    sms.sendTextMessage(number, null, message, pi, null);

}
}

Answer 3

I am a little confused here. It seems that you want to register aBroadcastReceiver for the "SMS_RECEIVED" IntentFilter but the filter has not been declared anywhere in the code as far as I can see.

Try replacing the null at the end of registerReceiver {} to new IntentFilter("SMS_RECEIVED")); to see if it works. Maybe its the reason why you are getting a null pointer exception.

i.e. } } }, null);

to } } }, new IntentFilter("SMS_RECEIVED"));