Question

我必须把《守则》放在后面,以理解我想要说的话:

public void répondre()
    {
         mt = MediaPlayer.create(context,R.raw.ringtone);
        mt.setVolume(5,5);
      mt.start();
      mt.setLooping(true);
      //startActivity((new Intent(Intent.ACTION_ANSWER)));
        AlertDialog.Builder ad = new AlertDialog.Builder(context);
        ad.setTitle("Appel en cours...");
        ad.setMessage("Voulez vous répondre à cet appel?");
        ad.setPositiveButton("Oui", 
                             new OnClickListener() {
                               public void onClick(DialogInterface dialog, 
                                                   int arg1) {
                                   mt.stop();
                                SipAudioCall incomingCall = null;
                             try {

                                     SipAudioCall.Listener listener = new SipAudioCall.Listener() {
                                        @Override
                                        public void onRinging(SipAudioCall call, SipProfile caller) {
                                            try {

                                                call.answerCall(30);
                                            } catch (Exception e) {
                                                Log.d("Call not answered","Call not answered",e);
                                            }
                                        }

                                    };

                                    SIPCommunicator wtActivity = (SIPCommunicator) context;

                                    incomingCall = wtActivity.manager.takeAudioCall(intent, listener);
                                    incomingCall.answerCall(30);
                                    incomingCall.startAudio();
                                    incomingCall.setSpeakerMode(true);
                                    if(incomingCall.isMuted()) {
                                        incomingCall.toggleMute();
                                    }

                                    wtActivity.call = incomingCall;
                                 String useName = wtActivity.call.getPeerProfile().getDisplayName();
                                    wtActivity.updateStatus("Vous êtes en communication avec " + useName);



                             } catch (Exception e) {
                                if (incomingCall != null) {
                                    incomingCall.close();
                                }
                            }
                        }

                 });

I want to show the caller s name(useName variable) in the AlertDialog. If i put this line(String useName = wtActivity.call.getPeerProfile().getDisplayName();) before MediaPlayerand make ad.setTitle("Appel en cours"+useName); the variable useName is null ! So how doing this ? Thank you very much.

Answer 1

幸运的是,我们不需要如问题标题所示,打破因果关系。打字(这不是处理电话申请的非常常见的情况)是,在你得知即将到来的电话时,打电话的人的名字就没有准备好。这是因为需要一段时间才能在接触中搜寻打电话者/里。

因此,为了处理这个问题,我建议你做以下工作之一:

indicate incoming call via AlertDialog, but present just caller number/URI. Start Handler and second later update the dialog so it displays name.
when call arrives, start handler and execute your code just second later. Hopefully at that moment Name will be available.

因此,无论如何,你都需要更新你。在接到呼吁后,警告会说了一些安全的时间。

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