diff --git a/app/src/main/java/com/maary/shareas/activity/StartActivity.kt b/app/src/main/java/com/maary/shareas/activity/StartActivity.kt
index cc1aa1f..6382307 100644
--- a/app/src/main/java/com/maary/shareas/activity/StartActivity.kt
+++ b/app/src/main/java/com/maary/shareas/activity/StartActivity.kt
@@ -94,7 +94,7 @@ class StartActivity : AppCompatActivity(){
         val homePFD:ParcelFileDescriptor?
         var lockPFD:ParcelFileDescriptor?
         val homeBitmap: Bitmap
-        var lockBitmap: Bitmap?
+        var lockBitmap: Bitmap
 
         if (checkPermission()){
             homePFD = wallpaperManager.getWallpaperFile(WallpaperManager.FLAG_SYSTEM)
@@ -109,10 +109,15 @@ class StartActivity : AppCompatActivity(){
 
             }else{
                 homeBitmap = (wallpaperManager.getBuiltInDrawable(WallpaperManager.FLAG_SYSTEM)).toBitmap()
-                lockBitmap = (wallpaperManager.getBuiltInDrawable(WallpaperManager.FLAG_LOCK)).toBitmapOrNull()
-                if (lockBitmap == null){
+                /**
+                 * 持续产生
+                 * java.lang.NullPointerException: wallpaperManager.getBuil…llpaperManager.FLAG_LOCK) must not be null
+                 * 问题
+                 * */
+//                lockBitmap = (wallpaperManager.getBuiltInDrawable(WallpaperManager.FLAG_LOCK)).toBitmap()
+//                if (lockBitmap == null){
                     lockBitmap = homeBitmap
-                }
+//                }
             }
             binding.homeContainer.setImageBitmap(homeBitmap)
             binding.lockContainer.setImageBitmap(lockBitmap)
diff --git a/app/src/main/res/drawable/ic_center_horizontal.xml b/app/src/main/res/drawable/ic_center_horizontal.xml
index f036e81..95011fe 100644
--- a/app/src/main/res/drawable/ic_center_horizontal.xml
+++ b/app/src/main/res/drawable/ic_center_horizontal.xml
@@ -2,7 +2,8 @@
     android:width="800dp"
     android:height="800dp"
     android:viewportWidth="24"
-    android:viewportHeight="24">
+    android:viewportHeight="24"
+    android:tint="?android:attr/textColorPrimary">
   <path
       android:fillColor="#FF000000"
       android:pathData="M16.707,12H23v1h-6.295l2.648,2.647 -0.707,0.707 -3.854,-3.853 3.854,-3.854 0.707,0.707zM5.647,9.354L8.293,12H2v1h6.295l-2.648,2.647 0.707,0.707 3.854,-3.853 -3.854,-3.854zM12,19h1V6h-1z"/>
diff --git a/app/src/main/res/drawable/ic_center_vertical.xml b/app/src/main/res/drawable/ic_center_vertical.xml
index eb5853f..b148d84 100644
--- a/app/src/main/res/drawable/ic_center_vertical.xml
+++ b/app/src/main/res/drawable/ic_center_vertical.xml
@@ -2,7 +2,8 @@
     android:width="800dp"
     android:height="800dp"
     android:viewportWidth="24"
-    android:viewportHeight="24">
+    android:viewportHeight="24"
+    android:tint="?android:attr/textColorPrimary">
   <path
       android:fillColor="#FF000000"
       android:pathData="M12.501,14.792l3.854,3.854 -0.707,0.707L13,16.705V23h-1v-6.293l-2.646,2.646 -0.707,-0.707zM8.647,6.354l3.854,3.854 3.854,-3.854 -0.707,-0.707L13,8.295V2h-1v6.293L9.354,5.647zM6,13h13v-1H6z"/>