diff --git a/src/com/android/dialer/settings/DialerSettingsActivity.java b/src/com/android/dialer/settings/DialerSettingsActivity.java
index 2b72772..fee0fa8 100644
--- a/src/com/android/dialer/settings/DialerSettingsActivity.java
+++ b/src/com/android/dialer/settings/DialerSettingsActivity.java
@@ -35,6 +35,8 @@
 public class DialerSettingsActivity extends AppCompatPreferenceActivity {
     protected SharedPreferences mPreferences;
 
+    private boolean mIsVisible;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -42,6 +44,31 @@
     }
 
     @Override
+    protected void onStart() {
+        super.onStart();
+        mIsVisible = true;
+    }
+
+    @Override
+    protected void onStop() {
+        mIsVisible = false;
+        super.onStop();
+    }
+
+    @Override
+    protected void onSaveInstanceState(Bundle out) {
+        mIsVisible = false;
+        super.onSaveInstanceState(out);
+    }
+
+    /**
+     * Returns true when the Activity is currently visible (between onStart and onStop).
+     */
+    /* package */ boolean isVisible() {
+        return mIsVisible;
+    }
+
+    @Override
     public void onBuildHeaders(List<Header> target) {
         Header displayOptionsHeader = new Header();
         displayOptionsHeader.titleRes = R.string.display_options_title;
@@ -131,6 +158,14 @@
     }
 
     @Override
+    public void onBackPressed() {
+        if (!isVisible()) {
+            return;
+        }
+        super.onBackPressed();
+    }
+
+    @Override
     protected boolean isValidFragment(String fragmentName) {
         return true;
     }