Add config changes consolidation to SettingsLib.

This commit adds a new API to DisplayDensityConfiguration that allows
setting the display density within the context of a batch update.

SimpleModeUtils now calls the new method to consolidate configuration
updates for display size, font size and navigation mode in ag/30875650.

Bug: 356738240
Test: adb shell am start -a com.google.android.settings.matcha.ACCESSIBILITY_APPEARANCE_SETTINGS -c android.intent.category.DEFAULT
Test: adb shell am start -n com.android.settings/com.google.android.settings.simplemode.SimpleModeSettingsActivity
Flag: com.android.window.flags.condense_configuration_change_for_simple_mode
Change-Id: Ia6fd575fc47f73d9c8862b9ddfcb74ca14ce7599

1 files changed, 30 insertions, 0 deletions

diff --git a/packages/SettingsLib/src/com/android/settingslib/display/DisplayDensityUtils.java b/packages/SettingsLib/src/com/android/settingslib/display/DisplayDensityUtils.java
index d91c6bd8e639..58e9355800d7 100644
--- a/packages/SettingsLib/src/com/android/settingslib/display/DisplayDensityUtils.java
+++ b/packages/SettingsLib/src/com/android/settingslib/display/DisplayDensityUtils.java
@@ -29,13 +29,16 @@ import android.view.Display;
 import android.view.DisplayInfo;
 import android.view.IWindowManager;
 import android.view.WindowManagerGlobal;
+import android.window.ConfigurationChangeSetting;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
 import com.android.settingslib.R;
 
+import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.List;
 import java.util.function.Predicate;
 
 /**
@@ -340,4 +343,31 @@ public class DisplayDensityUtils {
             }
         });
     }
+
+    /**
+     * Returns a list of {@link ConfigurationChangeSetting} object representing the forced display
+     * density settings for the displays that satisfy the predicate.
+     *
+     * @param index the index of the density value in the available density values array.
+     * @return a list of {@link ConfigurationChangeSetting} objects.
+     * @see IWindowManager#setConfigurationChangeSettingsForUser
+     */
+    @NonNull
+    public List<ConfigurationChangeSetting> getForcedDisplayDensitySetting(final int index) {
+        final ArrayList<ConfigurationChangeSetting> settings = new ArrayList<>();
+        for (final Display display : mDisplayManager.getDisplays(
+                DisplayManager.DISPLAY_CATEGORY_ALL_INCLUDING_DISABLED)) {
+            final int displayId = display.getDisplayId();
+            final DisplayInfo info = new DisplayInfo();
+            if (!display.getDisplayInfo(info)) {
+                Log.w(LOG_TAG, "Unable to get display info for display " + displayId);
+                continue;
+            }
+            if (!mPredicate.test(info)) {
+                continue;
+            }
+            settings.add(new ConfigurationChangeSetting.DensitySetting(displayId, mValues[index]));
+        }
+        return settings;
+    }
 }