Add Privacy and Security Settings

app/src/main/java/com/hippo/ehviewer/ui/MainActivity.java

@@ -36,6 +36,7 @@ import android.text.TextUtils;
 import android.view.Gravity;
 import android.view.MenuItem;
 import android.view.View;
+import android.view.WindowManager;
 import android.widget.FrameLayout;
 import android.widget.TextView;
 import android.widget.Toast;
@@ -392,6 +393,13 @@ public final class MainActivity extends StageActivity
         super.onResume();
 
         setNavCheckedItem(mNavCheckedItem);
+
+        if(Settings.getEnabledSecurity()){
+            getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE,
+                    WindowManager.LayoutParams.FLAG_SECURE);
+        }else{
+            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_SECURE);
+        }
     }
 
     @Override