Android 12 去掉设置进入子页面左上角的返回按钮，通过屏幕下方虚拟按键返回

--- a/packages/apps/Settings/src/com/android/settings/SettingsActivity.java
+++ b/packages/apps/Settings/src/com/android/settings/SettingsActivity.java
@@ -311,6 +311,10 @@ public class SettingsActivity extends SettingsBaseActivity
             actionBar.setDisplayHomeAsUpEnabled(!isInSetupWizard);
             actionBar.setHomeButtonEnabled(!isInSetupWizard);
             actionBar.setDisplayShowTitleEnabled(true);
+            //yim mod
+           actionBar.setDisplayHomeAsUpEnabled(false);
+           actionBar.setHomeButtonEnabled(false);
+           //end
         }
         mMainSwitch = findViewById(R.id.switch_bar);
         if (mMainSwitch != null) {