Refine the preference layout for homepage

Based on the Android S design, we update the layout
for homepage.

The scope covers the layout of preference and icons itself.

- Change the icon size for IA items.
- Change the layout spacing of preference.
- Change the margin or search bar.

Test: See the screen and confirm with UX
Bug: 177213699
Change-Id: I985966fdf39a5989d51991aa3c06ea5fd31e8fe2

src/com/android/settings/homepage/HomePagePreference.java

@@ -0,0 +1,49 @@
+/*
+ * 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.homepage;
+
+import android.content.Context;
+import android.util.AttributeSet;
+
+import androidx.preference.Preference;
+
+import com.android.settings.R;
+
+/** A customized layout for homepage preference. */
+public class HomePagePreference extends Preference {
+
+    public HomePagePreference(Context context) {
+        super(context);
+        setLayoutResource(R.layout.homepage_preference);
+    }
+
+    public HomePagePreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        setLayoutResource(R.layout.homepage_preference);
+    }
+
+    public HomePagePreference(Context context, AttributeSet attrs, int defStyleAttr) {
+        this(context, attrs, defStyleAttr, /* defStyleRes= */ 0);
+        setLayoutResource(R.layout.homepage_preference);
+    }
+
+    public HomePagePreference(Context context, AttributeSet attrs,
+            int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+        setLayoutResource(R.layout.homepage_preference);
+    }
+}

src/com/android/settings/homepage/RestrictedHomepagePreference.java

@@ -0,0 +1,122 @@
+/*
+ * 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.homepage;
+
+import static com.android.settingslib.RestrictedLockUtils.EnforcedAdmin;
+
+import android.content.Context;
+import android.os.UserHandle;
+import android.util.AttributeSet;
+
+import androidx.core.content.res.TypedArrayUtils;
+import androidx.preference.PreferenceManager;
+import androidx.preference.PreferenceViewHolder;
+
+import com.android.settings.R;
+import com.android.settingslib.RestrictedPreferenceHelper;
+
+/** Homepage preference that can be disabled by a device admin using a user restriction. */
+public class RestrictedHomepagePreference extends HomePagePreference {
+    private RestrictedPreferenceHelper mHelper;
+
+    public RestrictedHomepagePreference(Context context, AttributeSet attrs,
+            int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+        mHelper = new RestrictedPreferenceHelper(context, /* preference= */ this, attrs);
+    }
+
+    public RestrictedHomepagePreference(Context context, AttributeSet attrs, int defStyleAttr) {
+        this(context, attrs, defStyleAttr, /* defStyleRes= */ 0);
+    }
+
+    public RestrictedHomepagePreference(Context context, AttributeSet attrs) {
+        this(context, attrs, TypedArrayUtils.getAttr(context, R.attr.preferenceStyle,
+                android.R.attr.preferenceStyle));
+    }
+
+    public RestrictedHomepagePreference(Context context) {
+        this(context, /* attrs= */ null);
+    }
+
+    @Override
+    public void onBindViewHolder(PreferenceViewHolder holder) {
+        super.onBindViewHolder(holder);
+        mHelper.onBindViewHolder(holder);
+    }
+
+    @Override
+    public void performClick() {
+        if (!mHelper.performClick()) {
+            super.performClick();
+        }
+    }
+
+    @Override
+    protected void onAttachedToHierarchy(PreferenceManager preferenceManager) {
+        mHelper.onAttachedToHierarchy();
+        super.onAttachedToHierarchy(preferenceManager);
+    }
+
+    /**
+     * Set the user restriction and disable this preference.
+     *
+     * @param userRestriction constant from {@link android.os.UserManager}
+     */
+    public void checkRestrictionAndSetDisabled(String userRestriction) {
+        mHelper.checkRestrictionAndSetDisabled(userRestriction, UserHandle.myUserId());
+    }
+
+    /**
+     * Set the user restriction and disable this preference for the given user.
+     *
+     * @param userRestriction constant from {@link android.os.UserManager}
+     * @param userId          user to check the restriction for.
+     */
+    public void checkRestrictionAndSetDisabled(String userRestriction, int userId) {
+        mHelper.checkRestrictionAndSetDisabled(userRestriction, userId);
+    }
+
+    @Override
+    public void setEnabled(boolean enabled) {
+        if (enabled && isDisabledByAdmin()) {
+            mHelper.setDisabledByAdmin(/* admin= */ null);
+            return;
+        }
+        super.setEnabled(enabled);
+    }
+
+    /**
+     * Check whether this preference is disabled by admin.
+     *
+     * @return true if this preference is disabled by admin.
+     */
+    public boolean isDisabledByAdmin() {
+        return mHelper.isDisabledByAdmin();
+    }
+
+    /**
+     * Disable preference based on the enforce admin.
+     *
+     * @param admin details of the admin who enforced the restriction. If it is {@code null}, then
+     *              this preference will be enabled. Otherwise, it will be disabled.
+     */
+    public void setDisabledByAdmin(EnforcedAdmin admin) {
+        if (mHelper.setDisabledByAdmin(admin)) {
+            notifyChanged();
+        }
+    }
+}