launcher: create a device profile for foldables

This creates a device_profiles_split.xml that will be used when the
device is a foldable. This makes the changes contained for specific
devices and make it possible to use different padding files in the
future if needed.

Bug: 191879424
Test: tested with NexusLauncher and Launcher3, in foldables and
handhelds
Test: check that 4x4 is not scalable anymore on handhelds by using HSV

Change-Id: If6ef14e3611c5252634c080643433545ce186f0d
diff --git a/src/com/android/launcher3/InvariantDeviceProfile.java b/src/com/android/launcher3/InvariantDeviceProfile.java
index 1b2f177..d844b87 100644
--- a/src/com/android/launcher3/InvariantDeviceProfile.java
+++ b/src/com/android/launcher3/InvariantDeviceProfile.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2015 The Android Open Source Project
+ * Copyright (C) 2021 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -70,11 +70,6 @@
     public static final MainThreadInitializedObject<InvariantDeviceProfile> INSTANCE =
             new MainThreadInitializedObject<>(InvariantDeviceProfile::new);
 
-    private static final int DEFAULT_TRUE = -1;
-    private static final int DEFAULT_SPLIT_DISPLAY = 2;
-    private static final int GRID_ENABLED_ALL_DISPLAYS = 0;
-    private static final int GRID_ENABLED_SINGLE_DISPLAY = 1;
-
     private static final String KEY_IDP_GRID_NAME = "idp_grid_name";
 
     private static final float ICON_SIZE_DEFINED_IN_APP_DP = 48;
@@ -393,7 +388,9 @@
     private static ArrayList<DisplayOption> getPredefinedDeviceProfiles(
             Context context, String gridName, boolean isSplitDisplay, boolean allowDisabledGrid) {
         ArrayList<DisplayOption> profiles = new ArrayList<>();
-        try (XmlResourceParser parser = context.getResources().getXml(R.xml.device_profiles)) {
+        int xmlResource = isSplitDisplay ? R.xml.device_profiles_split : R.xml.device_profiles;
+
+        try (XmlResourceParser parser = context.getResources().getXml(xmlResource)) {
             final int depth = parser.getDepth();
             int type;
             while (((type = parser.next()) != XmlPullParser.END_TAG ||
@@ -411,8 +408,7 @@
                             if ((type == XmlPullParser.START_TAG) && "display-option".equals(
                                     parser.getName())) {
                                 profiles.add(new DisplayOption(gridOption, context,
-                                        Xml.asAttributeSet(parser),
-                                        isSplitDisplay ? DEFAULT_SPLIT_DISPLAY : DEFAULT_TRUE));
+                                        Xml.asAttributeSet(parser)));
                             }
                         }
                     }
@@ -450,7 +446,9 @@
      */
     public List<GridOption> parseAllGridOptions(Context context) {
         List<GridOption> result = new ArrayList<>();
-        try (XmlResourceParser parser = context.getResources().getXml(R.xml.device_profiles)) {
+        int xmlResource = isSplitDisplay ? R.xml.device_profiles_split : R.xml.device_profiles;
+
+        try (XmlResourceParser parser = context.getResources().getXml(xmlResource)) {
             final int depth = parser.getDepth();
             int type;
             while (((type = parser.next()) != XmlPullParser.END_TAG
@@ -702,11 +700,7 @@
             devicePaddingId = a.getResourceId(
                     R.styleable.GridDisplayOption_devicePaddingId, 0);
 
-            final int enabledInt =
-                    a.getInteger(R.styleable.GridDisplayOption_gridEnabled,
-                            GRID_ENABLED_ALL_DISPLAYS);
-            isEnabled = enabledInt == GRID_ENABLED_ALL_DISPLAYS
-                    || enabledInt == GRID_ENABLED_SINGLE_DISPLAY && !isSplitDisplay;
+            isEnabled = a.getBoolean(R.styleable.GridDisplayOption_gridEnabled, true);
 
             a.recycle();
             extraAttrs = Themes.createValueMap(context, attrs,
@@ -732,17 +726,15 @@
         private final float[] iconSizes = new float[COUNT_SIZES];
         private final float[] textSizes = new float[COUNT_SIZES];
 
-        DisplayOption(GridOption grid, Context context, AttributeSet attrs, int defaultFlagValue) {
+        DisplayOption(GridOption grid, Context context, AttributeSet attrs) {
             this.grid = grid;
 
-            TypedArray a = context.obtainStyledAttributes(
-                    attrs, R.styleable.ProfileDisplayOption);
+            TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ProfileDisplayOption);
 
             minWidthDps = a.getFloat(R.styleable.ProfileDisplayOption_minWidthDps, 0);
             minHeightDps = a.getFloat(R.styleable.ProfileDisplayOption_minHeightDps, 0);
 
-            canBeDefault = a.getInt(R.styleable.ProfileDisplayOption_canBeDefault, 0)
-                    == defaultFlagValue;
+            canBeDefault = a.getBoolean(R.styleable.ProfileDisplayOption_canBeDefault, false);
 
             float x;
             float y;