Add API demo for running multiple foreground services.

Change-Id: I44435f6e7750ccbbadf5e293dd10069c6cef94a4

samples/ApiDemos/src/com/example/android/apis/app/ForegroundService.java

@@ -259,6 +259,10 @@ public class ForegroundService extends Service {
             button.setOnClickListener(mBackgroundWakelockListener);
             button = (Button)findViewById(R.id.stop);
             button.setOnClickListener(mStopListener);
+            button = (Button)findViewById(R.id.start_foreground_2);
+            button.setOnClickListener(mForegroundListener2);
+            button = (Button)findViewById(R.id.stop_2);
+            button.setOnClickListener(mStopListener2);
         }
 
         private OnClickListener mForegroundListener = new OnClickListener() {
@@ -299,5 +303,21 @@ public class ForegroundService extends Service {
                         ForegroundService.class));
             }
         };
+
+        private OnClickListener mForegroundListener2 = new OnClickListener() {
+            public void onClick(View v) {
+                Intent intent = new Intent(ForegroundService.ACTION_FOREGROUND);
+                intent.setClass(Controller.this, ForegroundService2.class);
+                startService(intent);
+            }
+        };
+
+        private OnClickListener mStopListener2 = new OnClickListener() {
+            public void onClick(View v) {
+                stopService(new Intent(Controller.this,
+                        ForegroundService2.class));
+            }
+        };
+
     }
 }

samples/ApiDemos/src/com/example/android/apis/app/ForegroundService2.java

@@ -0,0 +1,20 @@
+/*
+ * 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.example.android.apis.app;
+
+public class ForegroundService2 extends ForegroundService {
+}