相关疑难解决方法(0)

BroadcastReceiver中的AlertDialog？可以吗？我正在开发一个应用程序,如果我收到短信,会弹出一个对话框.我试图在BroadcaseReceiver中编写代码.但我不能使用这行代码AlertDialog.Builder builder = new AlertDialog.Builder(this);.有人可以帮我提示一下!

public class SMSPopUpReceiver extends BroadcastReceiver {

    private static final String LOG_TAG = "SMSReceiver";
    public static final int NOTIFICATION_ID_RECEIVED = 0x1221;
    static final String ACTION = "android.provider.Telephony.SMS_RECEIVED";

    public void onReceive(Context context, Intent intent) {
        Log.i(LOG_TAG, "onReceive");

        if (intent.getAction().equals(SMSPopUpReceiver.ACTION)) {
            StringBuilder sb = new StringBuilder();
            Bundle bundle = intent.getExtras();
            if (bundle != null) {
            Object[] pdus = (Object[]) bundle.get("pdus");

            for (Object pdu : pdus){
                    SmsMessage messages =
            SmsMessage.createFromPdu((byte[]) pdu);

            sb.append("Received SMS\nFrom: ");
            sb.append(messages.getDisplayOriginatingAddress());
            sb.append("\n----Message----\n");
            sb.append( …