MSIM support for Wi-Fi calling setting.

UI change to support Wi-Fi calling settings for multi-SIM devices.

Bug: b/65648147
Test: manual
Change-Id: Ia2e3a835400873bf6d8bfc7a7690d98e74049076

tests/unit/src/com/android/settings/utils/MockedServiceManager.java

@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2017 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.testutils;
+
+import android.os.IBinder;
+import android.os.ServiceManager;
+import android.util.Log;
+
+import java.lang.reflect.Field;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.LinkedList;
+
+// This class is for replacing existing system service with the mocked service.
+// Copied from CellBroadcastReceiver app.
+public final class MockedServiceManager {
+
+    private final String TAG = MockedServiceManager.class.getSimpleName();
+
+    private final HashMap<String, IBinder> mServiceManagerMockedServices = new HashMap<>();
+
+    private final HashMap<InstanceKey, Object> mOldInstances = new HashMap<>();
+
+    private final LinkedList<InstanceKey> mInstanceKeys = new LinkedList<>();
+
+    private static class InstanceKey {
+        final Class mClass;
+        final String mInstName;
+        final Object mObj;
+
+        InstanceKey(final Class c, final String instName, final Object obj) {
+            mClass = c;
+            mInstName = instName;
+            mObj = obj;
+        }
+
+        @Override
+        public int hashCode() {
+            return (mClass.getName().hashCode() * 31 + mInstName.hashCode()) * 31;
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+            if (obj == null || obj.getClass() != getClass()) {
+                return false;
+            }
+
+            InstanceKey other = (InstanceKey) obj;
+            return (other.mClass == mClass && other.mInstName.equals(mInstName)
+                    && other.mObj == mObj);
+        }
+    }
+
+    public MockedServiceManager() throws Exception {
+        replaceInstance(ServiceManager.class, "sCache", null, mServiceManagerMockedServices);
+    }
+
+    public void replaceService(String key, IBinder binder) {
+        mServiceManagerMockedServices.put(key, binder);
+    }
+
+    public void restoreAllServices() throws Exception {
+        restoreInstances();
+    }
+
+    public synchronized void replaceInstance(final Class c, final String instanceName,
+            final Object obj, final Object newValue)
+            throws Exception {
+        Field field = c.getDeclaredField(instanceName);
+        field.setAccessible(true);
+
+        InstanceKey key = new InstanceKey(c, instanceName, obj);
+        if (!mOldInstances.containsKey(key)) {
+            mOldInstances.put(key, field.get(obj));
+            mInstanceKeys.add(key);
+        }
+        field.set(obj, newValue);
+    }
+
+    public synchronized void restoreInstances() throws Exception {
+        Iterator<InstanceKey> it = mInstanceKeys.descendingIterator();
+
+        while (it.hasNext()) {
+            InstanceKey key = it.next();
+            Field field = key.mClass.getDeclaredField(key.mInstName);
+            field.setAccessible(true);
+            field.set(key.mObj, mOldInstances.get(key));
+        }
+
+        mInstanceKeys.clear();
+        mOldInstances.clear();
+    }
+}