解决安卓虚拟按键居中问题的代码调整

diff --git a/frameworks/base/packages/SystemUI/res/layout/navigation_bar.xml b/frameworks/base/packages/SystemUI/res/layout/navigation_bar.xml
index 3273f72..1a199ed 100755
--- a/frameworks/base/packages/SystemUI/res/layout/navigation_bar.xml
+++ b/frameworks/base/packages/SystemUI/res/layout/navigation_bar.xml
@@ -208,7 +208,8 @@

             <!-- navigation controls -->
             <FrameLayout
-                android:layout_weight="0"
+                   android:layout_weight="0"
+                   android:visibility="gone"
                 android:layout_width="match_parent"
                 android:layout_height="@dimen/navigation_side_padding" >
                 <com.android.systemui.statusbar.policy.KeyButtonView
@@ -219,7 +220,7 @@
                     android:scaleType="centerInside"
                     android:src="@drawable/ic_ime_switcher_default"
                     android:layout_gravity="top"
-                    android:visibility="invisible" />
+                    android:visibility="gone" />

                 <com.android.systemui.statusbar.policy.KeyButtonView
                     android:id="@+id/menu"
@@ -229,10 +230,16 @@
                     android:src="@drawable/ic_sysbar_menu_land"
                     android:scaleType="centerInside"
                     android:layout_gravity="top"
-                    android:visibility="invisible"
+                    android:visibility="gone"
                     systemui:keyCode="82" />

             </FrameLayout>

+                       <View 
+                android:layout_height="25dp"
+                android:layout_width="match_parent"
+                android:visibility="invisible"
+                               />
+                       
             <com.android.systemui.statusbar.policy.KeyButtonView android:id="@+id/recent_apps"
                 android:layout_height="@dimen/navigation_key_width"
                 android:layout_width="match_parent"
@@ -246,54 +253,60 @@
                 android:layout_height="match_parent"
                 android:layout_width="match_parent"
                 android:layout_weight="1"
-                android:visibility="invisible"
+                android:visibility="gone"
                />

            <com.android.systemui.statusbar.policy.KeyButtonView android:id="@+id/sound"
-                android:layout_height="@dimen/navigation_key_width"
+                android:layout_height="0.0dp"
                 android:layout_width="match_parent"
                 android:src="@drawable/ic_sysbar_sound_land"
                 android:scaleType="center"
-                android:layout_weight="0"
+                android:layout_weight="1"
                android:contentDescription="@string/accessibility_sound"
                 />
             <View