使用android eclipse的死代码

Question

我正在研究android应用程序,其中我使用逻辑从协调中找到一个人的方向.一切正常,但我在控制台出错:"死码".我的代码如下,请解释一下这个问题.

private void direction() {

        String userLocation = mLatitude + ","
                + mLongitude ;

        if(userLocation!=null){
            String distLocation = Constants.sMY_LOCATION.getLatitude() + ","
                    + Constants.sMY_LOCATION.getLongitude();
            String url = "https://maps.google.com/maps?f=d&saddr=" + userLocation
                    + "&daddr=" + distLocation;
            Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
            startActivity(i);
        }else{ // Getting Dead Code Yellow error here
            finish();
            Toast.makeText(getBaseContext(), "Please check your internet and try again!", Toast.LENGTH_SHORT).show();
        }


    }

Answer 1

这是因为你的其他人无法联系到

String userLocation = mLatitude + ","
            + mLongitude ;

    if(userLocation!=null){
       ...
    }else{
       ...
    }

userLocation永远不会为null