Question

我正在尝试实现广播接收器，以便在我的Android设备上收到短信时实现通知弹出窗口。但是，我设置了一个条件，只检测来自预定义发件人的特定SMS，然后弹出通知。这是我到目前为止编码的内容：

public class MyBroadcastReceiver extends BroadcastReceiver
{
    private static final String TAG = "MyBroadCastReceiver";
     String str = "";
     static Context context;
     String sender;

    @Override
    public void onReceive(Context arg0, Intent arg1) 
    {

//      Log.i(TAG,"OnReceive ++      ");
        Bundle bndl = arg1.getExtras();
        SmsMessage[] msg = null;

        if (null != bndl)
        {
            //---retrieve the SMS message received---
            Object[] pdus = (Object[]) bndl.get("pdus");
            msg = new SmsMessage[pdus.length];

            if(msg[0].getOriginatingAddress().endsWith("AIRMTA") ||
               msg[0].getOriginatingAddress().endsWith("ICICIB") || 
               msg[0].getOriginatingAddress().endsWith("FCHRGE") ||
               msg[0].getOriginatingAddress().endsWith("MYAMEX") ||
               msg[0].getOriginatingAddress().endsWith("MOBIKW") ||
               msg[0].getOriginatingAddress().endsWith("OLACAB") ||
               msg[0].getOriginatingAddress().endsWith("HDFCB")  ||
               msg[0].getOriginatingAddress().endsWith("AIRMNY") 
               )
            {
                for (int i=0; i<msg.length; i++)
                {
                    msg[i] = SmsMessage.createFromPdu((byte[])pdus[i]);             
//                  str += "SMS From " + msg[i].getOriginatingAddress();
                    sender = msg[i].getOriginatingAddress();
                    str += " :\r\n";
                    str += msg[i].getMessageBody().toString();
                    str += "\n";
                    context = arg0;
                }


            //---display incoming SMS as a Android Toast---
//            Toast.makeText(arg0, str, Toast.LENGTH_SHORT).show();

            //---Create a status bar notification for incoming sms-->
            int mNotificationId = 001;
            NotificationCompat.Builder  mBuilder = new   NotificationCompat.Builder(context);
            mBuilder.setContentTitle(sender);
            mBuilder.setContentText(str);
            mBuilder.setTicker("New Message Alert!");
            mBuilder.setSmallIcon(R.drawable.notification);

            Intent resultIntent  = new Intent(arg0, MainActivity.class);
            PendingIntent resultPendingIntent = PendingIntent.getActivity(arg0, 0, resultIntent, PendingIntent.FLAG_UPDATE_CURRENT);

            mBuilder.setContentIntent(resultPendingIntent);

            NotificationManager mNotifyMgr = (NotificationManager) arg0.getSystemService(Context.NOTIFICATION_SERVICE);
            mNotifyMgr.notify(mNotificationId, mBuilder.build());

            MapsFragment obj = new MapsFragment();
            obj.initilizeMap();
        }
        }

    }
}

不幸的是，每次收到短信时，应用程序都会崩溃，无论是来自任何发件人。我无法理解代码出了什么问题！任何人都可以帮我解决这个问题吗？

以下是日志cat错误报告：

Process: com.techfrk.fetchinboxsms, PID: 21956
java.lang.RuntimeException: Unable to start receiver com.techfrk.fetchinboxsms.MyBroadcastReceiver: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.telephony.SmsMessage.getOriginatingAddress()' on a null object reference
    at android.app.ActivityThread.handleReceiver(ActivityThread.java:2616)
    at android.app.ActivityThread.access$1700(ActivityThread.java:151)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1380)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:135)
    at android.app.ActivityThread.main(ActivityThread.java:5254)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)

Answer 1

您收到NullPointerException异常，因为在调用msg[0].getOriginatingAddress().endsWith()时，您的msg数组始终为空。使用msg = new SmsMessage[pdus.length]创建一个大小为pdus.length的空数组，但这不会向其添加任何对象。

而不是

if(msg[0].getOriginatingAddress().endsWith("AIRMTA") ||
           msg[0].getOriginatingAddress().endsWith("ICICIB") || 
           msg[0].getOriginatingAddress().endsWith("FCHRGE") ||
           msg[0].getOriginatingAddress().endsWith("MYAMEX") ||
           msg[0].getOriginatingAddress().endsWith("MOBIKW") ||
           msg[0].getOriginatingAddress().endsWith("OLACAB") ||
           msg[0].getOriginatingAddress().endsWith("HDFCB")  ||
           msg[0].getOriginatingAddress().endsWith("AIRMNY") 
           )
        {
            for (int i=0; i<msg.length; i++)
            {
                msg[i] = SmsMessage.createFromPdu((byte[])pdus[i]);             
                // str += "SMS From " + msg[i].getOriginatingAddress();
                sender = msg[i].getOriginatingAddress();
                str += " :\r\n";
                str += msg[i].getMessageBody().toString();
                str += "\n";
                context = arg0;
            }
}

你应该做点什么

SmsMessage[] messages = Telephony.Sms.Intents.getMessagesFromIntent(arg1);

if(messages.length < 1) return;

SmsMessage sms = messages[0];
sender = sms.getOriginatingAddress();
str = sms.getMessageBody().toString();

if (sms.getOriginatingAddress().endsWith("AIRMTA")) { // add all your needed statements
    // show your notification
}

请注意，为了更好地理解，此代码非常简化。

收到新的SMS后实施BroadCastReceiver

1 个答案: