ApiSamples: Add PIP sample

Test: Open ApiSamples > App > Activity > Picture in Picture
Change-Id: I205cdc00533b19be46c7837012a96705c7a4a62f

samples/ApiDemos/AndroidManifest.xml

@@ -285,6 +285,18 @@
             </intent-filter>
         </activity>
 
+        <activity android:name=".app.PictureInPicture"
+                  android:label="@string/activity_picture_in_picture"
+                  android:resizeableActivity="true"
+                  android:supportsPictureInPicture="true"
+                  android:configChanges=
+                    "screenSize|smallestScreenSize|screenLayout|orientation">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.SAMPLE_CODE" />
+            </intent-filter>
+        </activity>
+
         <activity android:name=".app.PresentationActivity"
                 android:label="@string/activity_presentation">
             <intent-filter>

samples/ApiDemos/res/layout/picture_in_picture.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2018 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.
+  -->
+
+<!-- Demonstrates implementation of a DeviceAdmin. -->
+
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical" android:padding="4dip"
+    android:gravity="center_horizontal"
+    android:layout_width="match_parent" android:layout_height="match_parent">
+
+    <Button android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:id="@+id/enter_pip"
+        android:text="@string/enter_picture_in_picture">
+
+    </Button>
+</LinearLayout>
+

samples/ApiDemos/res/values/strings.xml

@@ -62,6 +62,9 @@
         instead of programmatically.</string>
     <string name="screen_orientation">Screen Orientation</string>
 
+    <string name="activity_picture_in_picture">App/Activity/Picture in Picture</string>
+    <string name="enter_picture_in_picture">Enter picture-in-picture mode</string>
+
     <string name="activity_translucent">App/Activity/Translucent</string>
     <string name="translucent_background">Example of how you can make an
             activity have a translucent background, compositing over

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

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2018 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;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.widget.Button;
+
+import com.example.android.apis.R;
+
+public class PictureInPicture extends Activity {
+
+    private Button mEnterPip;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.picture_in_picture);
+
+        mEnterPip = (Button)findViewById(R.id.enter_pip);
+        mEnterPip.setOnClickListener((v) -> enterPictureInPictureMode());
+    }
+
+    @Override
+    protected void onUserLeaveHint() {
+        enterPictureInPictureMode();
+    }
+}