cmsdk: Move UserContentObserver from framework

* This is used by LiveDisplay, but may be useful for other purposes.
   Move it into the internal/common package instead of keeping an
   external dependency.

Change-Id: I87c0af11e19ecaea4a1a5b736fc286cd9a8ac55c

cm/lib/main/java/org/cyanogenmod/platform/internal/common/UserContentObserver.java

@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2016 The CyanogenMod 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 org.cyanogenmod.platform.internal.common;
+
+import android.app.ActivityManagerNative;
+import android.app.IUserSwitchObserver;
+import android.database.ContentObserver;
+import android.net.Uri;
+import android.os.Handler;
+import android.os.IRemoteCallback;
+import android.os.RemoteException;
+import android.util.Log;
+
+/**
+ * Simple extension of ContentObserver that also listens for user switch events to call update
+ */
+public abstract class UserContentObserver extends ContentObserver {
+    private static final String TAG = "UserContentObserver";
+
+    private Runnable mUpdateRunnable;
+
+    private IUserSwitchObserver mUserSwitchObserver = new IUserSwitchObserver.Stub() {
+        @Override
+        public void onUserSwitching(int newUserId, IRemoteCallback reply) {
+        }
+        @Override
+        public void onUserSwitchComplete(int newUserId) throws RemoteException {
+            mHandler.post(mUpdateRunnable);
+        }
+        @Override
+        public void onForegroundProfileSwitch(int newProfileId) {
+        }
+    };
+
+    private Handler mHandler;
+
+    /**
+     * Content observer that tracks user switches
+     * to allow clients to re-load settings for current user
+     */
+    public UserContentObserver(Handler handler) {
+        super(handler);
+        mHandler = handler;
+        mUpdateRunnable = new Runnable() {
+            @Override
+            public void run() {
+                update();
+            }
+        };
+    }
+
+    protected void observe() {
+        try {
+            ActivityManagerNative.getDefault().registerUserSwitchObserver(mUserSwitchObserver);
+        } catch (RemoteException e) {
+            Log.w(TAG, "Unable to register user switch observer!", e);
+        }
+    }
+
+    protected void unobserve() {
+        try {
+            mHandler.removeCallbacks(mUpdateRunnable);
+            ActivityManagerNative.getDefault().unregisterUserSwitchObserver(mUserSwitchObserver);
+        } catch (RemoteException e) {
+            Log.w(TAG, "Unable to unregister user switch observer!", e);
+        }
+    }
+
+    /**
+     *  Called to notify of registered uri changes and user switches.
+     *  Always invoked on the handler passed in at construction
+     */
+    protected abstract void update();
+
+    @Override
+    public void onChange(boolean selfChange, Uri uri) {
+        update();
+    }
+}

cm/lib/main/java/org/cyanogenmod/platform/internal/display/LiveDisplayFeature.java

@@ -27,9 +27,9 @@ import android.os.Handler;
 import android.os.UserHandle;
 import android.util.Log;
 
-import com.android.server.pm.UserContentObserver;
 import com.android.server.twilight.TwilightState;
 
+import org.cyanogenmod.platform.internal.common.UserContentObserver;
 import org.cyanogenmod.platform.internal.display.LiveDisplayService.State;
 
 import java.io.PrintWriter;

cm/lib/main/java/org/cyanogenmod/platform/internal/display/LiveDisplayService.java

@@ -45,13 +45,13 @@ import android.view.Display;
 import com.android.internal.util.ArrayUtils;
 import com.android.server.LocalServices;
 import com.android.server.ServiceThread;
-import com.android.server.pm.UserContentObserver;
 import com.android.server.twilight.TwilightListener;
 import com.android.server.twilight.TwilightManager;
 import com.android.server.twilight.TwilightState;
 
 import org.cyanogenmod.internal.util.QSConstants;
 import org.cyanogenmod.internal.util.QSUtils;
+import org.cyanogenmod.platform.internal.common.UserContentObserver;
 import org.cyanogenmod.platform.internal.CMSystemService;
 import org.cyanogenmod.platform.internal.R;