Remove old default apps code and use roles instead.

Default apps are moved into PermissionController.

Bug: 124452117
Bug: 124457823
Test: presubmit & manual
Change-Id: I5f68e5b77cd6163d093590185314270706d75391

src/com/android/settings/applications/DefaultAppsPreferenceController.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2019 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.applications;
+
+import android.app.role.RoleManager;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.icu.text.ListFormatter;
+import android.text.TextUtils;
+
+import com.android.settings.core.BasePreferenceController;
+import com.android.settingslib.applications.AppUtils;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class DefaultAppsPreferenceController extends BasePreferenceController {
+
+    private final PackageManager mPackageManager;
+    private final RoleManager mRoleManager;
+
+    public DefaultAppsPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+
+        mPackageManager = context.getPackageManager();
+        mRoleManager = context.getSystemService(RoleManager.class);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        final List<CharSequence> defaultAppLabels = new ArrayList<>();
+        final CharSequence defaultBrowserLabel = getDefaultAppLabel(RoleManager.ROLE_BROWSER);
+        if(!TextUtils.isEmpty(defaultBrowserLabel)) {
+            defaultAppLabels.add(defaultBrowserLabel);
+        }
+        final CharSequence defaultPhoneLabel = getDefaultAppLabel(RoleManager.ROLE_DIALER);
+        if(!TextUtils.isEmpty(defaultPhoneLabel)) {
+            defaultAppLabels.add(defaultPhoneLabel);
+        }
+        final CharSequence defaultSmsLabel = getDefaultAppLabel(RoleManager.ROLE_SMS);
+        if(!TextUtils.isEmpty(defaultSmsLabel)) {
+            defaultAppLabels.add(defaultSmsLabel);
+        }
+        if (defaultAppLabels.isEmpty()) {
+            return null;
+        }
+        return ListFormatter.getInstance().format(defaultAppLabels);
+    }
+
+    private CharSequence getDefaultAppLabel(String roleName) {
+        final List<String> packageNames = mRoleManager.getRoleHolders(roleName);
+        if (packageNames.isEmpty()) {
+            return null;
+        }
+        final String packageName = packageNames.get(0);
+        return AppUtils.getApplicationLabel(mPackageManager, packageName);
+    }
+}