将添加指纹界面的navigation bar隐藏掉

LA.UM.7.6.2/LINUX/android/packages/apps/Settings/src/com/android/settings/fingerprint/FingerprintEnrollEnrolling.java 
index f3c1486..4648ba5 100644
@@ -50,4 +50,6 @@ import com.android.settings.core.instrumentation.InstrumentedDialogFragment;
 import com.android.settings.password.ChooseLockSettingsHelper;
 
+import android.view.WindowManager;
+
 /**
  * Activity which handles the actual enrolling for fingerprint.
@@ -105,4 +107,9 @@ public class FingerprintEnrollEnrolling extends FingerprintEnrollBase
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+
+        getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+                | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+
         setContentView(R.layout.fingerprint_enroll_enrolling);
         setHeaderText(R.string.security_settings_fingerprint_enroll_repeat_title);