Make PeopleActivity extends AppCompatActivity (1/3)

This CL includes a subset of reversion of ag/871001.

This topic of CLs will lead to the following changes in APK sizes:

- GoogleContacts: 8.0MB --> 8.7MB
- GoogleContacts-N: 7.6MB --> 8.2MB

Bug 27687799

Change-Id: Id94598e42a5016badeafee3f4f0dc2a515fc68eb
diff --git a/src/com/android/contacts/AppCompatContactsActivity.java b/src/com/android/contacts/AppCompatContactsActivity.java
new file mode 100644
index 0000000..7654b27
--- /dev/null
+++ b/src/com/android/contacts/AppCompatContactsActivity.java
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2016 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.contacts;
+
+import android.app.Fragment;
+import android.app.FragmentManager;
+import android.app.FragmentTransaction;
+import android.content.ContentResolver;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.view.View;
+
+import com.android.contacts.common.activity.AppCompatTransactionSafeActivity;
+import com.android.contacts.common.testing.InjectedServices;
+
+/**
+ * A common superclass for Contacts activities that handles application-wide services, copied from
+ * {@link com.android.contacts.ContactsActivity}, which will be deprecated after Kitkat backporting
+ * is done.
+ */
+public abstract class AppCompatContactsActivity extends AppCompatTransactionSafeActivity
+        implements ContactSaveService.Listener {
+
+    private ContentResolver mContentResolver;
+
+    @Override
+    public ContentResolver getContentResolver() {
+        if (mContentResolver == null) {
+            InjectedServices services = ContactsApplication.getInjectedServices();
+            if (services != null) {
+                mContentResolver = services.getContentResolver();
+            }
+            if (mContentResolver == null) {
+                mContentResolver = super.getContentResolver();
+            }
+        }
+        return mContentResolver;
+    }
+
+    @Override
+    public SharedPreferences getSharedPreferences(String name, int mode) {
+        InjectedServices services = ContactsApplication.getInjectedServices();
+        if (services != null) {
+            SharedPreferences prefs = services.getSharedPreferences();
+            if (prefs != null) {
+                return prefs;
+            }
+        }
+
+        return super.getSharedPreferences(name, mode);
+    }
+
+    @Override
+    public Object getSystemService(String name) {
+        Object service = super.getSystemService(name);
+        if (service != null) {
+            return service;
+        }
+
+        return getApplicationContext().getSystemService(name);
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        ContactSaveService.registerListener(this);
+        super.onCreate(savedInstanceState);
+    }
+
+    @Override
+    protected void onDestroy() {
+        ContactSaveService.unregisterListener(this);
+        super.onDestroy();
+    }
+
+    @Override
+    public void onServiceCompleted(Intent callbackIntent) {
+        onNewIntent(callbackIntent);
+    }
+
+    /**
+     * Convenient version of {@link FragmentManager#findFragmentById(int)}, which throws
+     * an exception if the fragment doesn't exist.
+     */
+    @SuppressWarnings("unchecked")
+    public <T extends Fragment> T getFragment(int id) {
+        T result = (T)getFragmentManager().findFragmentById(id);
+        if (result == null) {
+            throw new IllegalArgumentException("fragment 0x" + Integer.toHexString(id)
+                    + " doesn't exist");
+        }
+        return result;
+    }
+
+    /**
+     * Convenient version of {@link #findViewById(int)}, which throws
+     * an exception if the view doesn't exist.
+     */
+    @SuppressWarnings("unchecked")
+    public <T extends View> T getView(int id) {
+        T result = (T)findViewById(id);
+        if (result == null) {
+            throw new IllegalArgumentException("view 0x" + Integer.toHexString(id)
+                    + " doesn't exist");
+        }
+        return result;
+    }
+
+    protected static void showFragment(FragmentTransaction ft, Fragment f) {
+        if ((f != null) && f.isHidden()) ft.show(f);
+    }
+
+    protected static void hideFragment(FragmentTransaction ft, Fragment f) {
+        if ((f != null) && !f.isHidden()) ft.hide(f);
+    }
+}