Check smartphone horizontally

You can use the following strategy:

getResources().getConfiguration().orientation

And the result will be according to the documentation that is here . However, I've seen some people complaining about this way of checking, they say it's not reliable, and you can use an android service:

public String getRotation(Context context){
    final int rotation = ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getOrientation();
           switch (rotation) {
            case Surface.ROTATION_0:
                return "portrait";
            case Surface.ROTATION_90:
                return "landscape";
            case Surface.ROTATION_180:
                return "reverse portrait";
            default:
                return "reverse landscape";
            }
        }

I saw your comment and you know that using the measures, this way that Carlos Bridi posted and very good, but if you using measures you can use this code below:

public class MainActivity extends Activity
{
    @Override
    protected void onCreate(Bundle b)
    {
        super.onCreate(b);
        setContentView(R.layout.activity_main);

        // get the display metrics
        DisplayMetrics metrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metrics);

        int width = metrics.widthPixels;
        int height = metrics.heightPixels;

        boolean isLandscape = width > height;
    }
}

/ p>

public boolean isLandscape()
{
    DisplayMetrics metrics = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(metrics);
    return (metrics.widthPixels>metrics.heightPixels);
}