Set background of all face enroll status/footer bars

Moves the logic for setting an explicit background on the status and
footer bars shown during face and fingerprint enrollment from
BiometricEnrollIntroduction to BiometricEnrollBase. This ensures that
the status and footer bars on all biometric enroll screens will have
their backgrounds set, preventing the screen content from showing
through.

Test: Manual

Fixes: 190138494
Change-Id: If5050d07d277f51c784daecf80d5e3cdeae0ba49

src/com/android/settings/biometrics/BiometricEnrollIntroduction.java

@@ -18,8 +18,6 @@ package com.android.settings.biometrics;
 
 import android.app.admin.DevicePolicyManager;
 import android.content.Intent;
-import android.content.res.ColorStateList;
-import android.graphics.Color;
 import android.graphics.PorterDuff;
 import android.graphics.PorterDuffColorFilter;
 import android.os.Bundle;
@@ -27,17 +25,14 @@ import android.os.UserHandle;
 import android.os.UserManager;
 import android.util.Log;
 import android.view.View;
-import android.widget.LinearLayout;
 import android.widget.TextView;
 
-import androidx.annotation.ColorInt;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
 import com.android.internal.widget.LockPatternUtils;
 import com.android.settings.R;
 import com.android.settings.SetupWizardUtils;
-import com.android.settings.Utils;
 import com.android.settings.password.ChooseLockGeneric;
 import com.android.settings.password.ChooseLockSettingsHelper;
 
@@ -187,15 +182,6 @@ public abstract class BiometricEnrollIntroduction extends BiometricEnrollBase
         }
     }
 
-    @Override
-    protected void onPostCreate(@Nullable Bundle savedInstanceState) {
-        super.onPostCreate(savedInstanceState);
-        final LinearLayout buttonContainer = mFooterBarMixin.getButtonContainer();
-        if (buttonContainer != null) {
-            buttonContainer.setBackgroundColor(getBackgroundColor());
-        }
-    }
-
     @Override
     protected void onResume() {
         super.onResume();
@@ -213,12 +199,6 @@ public abstract class BiometricEnrollIntroduction extends BiometricEnrollBase
         }
     }
 
-    @Override
-    public void onAttachedToWindow() {
-        super.onAttachedToWindow();
-        getWindow().setStatusBarColor(getBackgroundColor());
-    }
-
     @Override
     protected void onSaveInstanceState(Bundle outState) {
         super.onSaveInstanceState(outState);
@@ -355,10 +335,4 @@ public abstract class BiometricEnrollIntroduction extends BiometricEnrollBase
         }
         return mIconColorFilter;
     }
-
-    @ColorInt
-    private int getBackgroundColor() {
-        final ColorStateList stateList = Utils.getColorAttr(this, android.R.attr.windowBackground);
-        return stateList != null ? stateList.getDefaultColor() : Color.TRANSPARENT;
-    }
 }