呼叫转发无法使用以下代码来工作

Question

当我尝试通过此代码转发呼叫时，什么也不会发生。 我想在特定号码上向前拨打电话。请帮助我。

callforward("**21*MobileNo");// While incoming call.
private void callforward(String callForwardString) {

        PhoneCallListener phoneListener = new PhoneCallListener();
        TelephonyManager telephonyManager = (TelephonyManager)
                ctx.getSystemService(Context.TELEPHONY_SERVICE);
        telephonyManager.listen(phoneListener, PhoneStateListener.LISTEN_CALL_STATE);
        Intent intentCallForward = new Intent(Intent.ACTION_CALL);
        Uri mmiCode = Uri.fromParts("tel", callForwardString, ("#"));
        intentCallForward.setData(mmiCode);
        System.out.println("Call FWD Number:"+callForwardString);
        if (ActivityCompat.checkSelfPermission(ctx, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
            // TODO: Consider calling
            //    ActivityCompat#requestPermissions
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for ActivityCompat#requestPermissions for more details.
            return;
        }
        ctx.startActivity(intentCallForward);

    }

Answer 1

实际上应该通过移动设备末尾的＃通过＃

callforward("**21*MobileNo#");//传入时。

//对于模拟器，您必须通过**21*5556#。

这里＃对于转发电话更为重要。