Question

我正在开发一款我想成为的Android应用能够打电话，但有一个非常精确的限制，这是 “打错了电话”。我想要的是，能够挂断电话电话开始振铃的那一刻。

现在我能够知道手机何时开始尝试制作打电话，但几秒钟内没有“振铃”活动网络，这是我愿意做的。

我怎样才能停止这个确切的时刻？

Answer 1

通过PhoneStateListener使用onCallStateChanged（），您只能检测到电话何时开始拨打电话以及何时拨打电话，但您无法确定何时拨打电话＆＃34;开始了。我试过一次，看看下面的代码：

拨出电话时，拨出电话从IDLE开始到OFFHOOK，在拨号时拨打IDLE。唯一的解决方法是在拨出电话开始后几秒钟内使用计时器挂断，但是，你永远不能保证手机会响铃。

  public abstract class PhoneCallReceiver extends BroadcastReceiver {
        static CallStartEndDetector listener;



    @Override
    public void onReceive(Context context, Intent intent) {
        savedContext = context;
        if(listener == null){
            listener = new CallStartEndDetector();
        }


            TelephonyManager telephony = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE); 
        telephony.listen(listener, PhoneStateListener.LISTEN_CALL_STATE);
    }



    public class CallStartEndDetector extends PhoneStateListener {
        int lastState = TelephonyManager.CALL_STATE_IDLE;
        boolean isIncoming;

        public PhonecallStartEndDetector() {}


        //Incoming call-   IDLE to RINGING when it rings, to OFFHOOK when it's answered, to IDLE when hung up
        //Outgoing call-  from IDLE to OFFHOOK when dialed out, to IDLE when hunged up

        @Override
        public void onCallStateChanged(int state, String incomingNumber) {
            super.onCallStateChanged(state, incomingNumber);
            if(lastState == state){
                //No change
                return;
            }
            switch (state) {
                case TelephonyManager.CALL_STATE_RINGING:
                    isIncoming = true;
                     //incoming call started
                    break;
                case TelephonyManager.CALL_STATE_OFFHOOK:
                    //Transition of ringing->offhook are pickups of incoming calls.  Nothing down on them
                    if(lastState != TelephonyManager.CALL_STATE_RINGING){
                        isIncoming = false;
                       //outgoing call started
                    }
                    break;
                case TelephonyManager.CALL_STATE_IDLE:
                    //End of call(Idle).  The type depends on the previous state(s)
                    if(lastState == TelephonyManager.CALL_STATE_RINGING){
                        // missed call
                    }
                    else if(isIncoming){
                          //incoming call ended
                    }
                    else{
                       //outgoing call ended                                              
                    }
                    break;
            }
            lastState = state;
        }

    }



}

Answer 2

在PhoneStateListener

中使用onCallStateChanged（）

如何拨打未接来电？

2 个答案: