Add support for PiP on Oreo

app/src/main/AndroidManifest.xml

@@ -103,7 +103,10 @@
             android:configChanges="mcc|mnc|locale|touchscreen|keyboard|keyboardHidden|navigation|screenLayout|fontScale|uiMode|orientation|screenSize|smallestScreenSize|layoutDirection"
             android:screenOrientation="sensorLandscape"
             android:noHistory="true"
+            android:supportsPictureInPicture="true"
             android:resizeableActivity="true"
+            android:launchMode="singleTask"
+            android:excludeFromRecents="true"
             android:theme="@style/StreamTheme">
             <meta-data
                 android:name="android.support.PARENT_ACTIVITY"

app/src/main/java/com/limelight/Game.java

@@ -30,6 +30,7 @@ import com.limelight.utils.UiHelper;
 
 import android.annotation.SuppressLint;
 import android.app.Activity;
+import android.app.PictureInPictureParams;
 import android.app.Service;
 import android.content.ComponentName;
 import android.content.Context;
@@ -46,6 +47,7 @@ import android.os.Bundle;
 import android.os.Handler;
 import android.os.IBinder;
 import android.os.SystemClock;
+import android.util.Rational;
 import android.view.Display;
 import android.view.InputDevice;
 import android.view.KeyEvent;
@@ -357,6 +359,20 @@ public class Game extends Activity implements SurfaceHolder.Callback,
         streamView.getHolder().addCallback(this);
     }
 
+    @Override
+    public void onUserLeaveHint() {
+        super.onUserLeaveHint();
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            if (prefConfig.enablePip && connected) {
+                enterPictureInPictureMode(
+                        new PictureInPictureParams.Builder()
+                                .setAspectRatio(new Rational(prefConfig.width, prefConfig.height))
+                                .build());
+            }
+        }
+    }
+
     @Override
     public void onWindowFocusChanged(boolean hasFocus) {
         super.onWindowFocusChanged(hasFocus);

app/src/main/java/com/limelight/preferences/PreferenceConfiguration.java

@@ -26,6 +26,7 @@ public class PreferenceConfiguration {
     private static final String BATTERY_SAVER_PREF_STRING = "checkbox_battery_saver";
     private static final String DISABLE_FRAME_DROP_PREF_STRING = "checkbox_disable_frame_drop";
     private static final String ENABLE_HDR_PREF_STRING = "checkbox_enable_hdr";
+    private static final String ENABLE_PIP_PREF_STRING = "checkbox_enable_pip";
 
     private static final int BITRATE_DEFAULT_720_30 = 5;
     private static final int BITRATE_DEFAULT_720_60 = 10;
@@ -52,6 +53,7 @@ public class PreferenceConfiguration {
     private static final boolean DEFAULT_BATTERY_SAVER = false;
     private static final boolean DEFAULT_DISABLE_FRAME_DROP = false;
     private static final boolean DEFAULT_ENABLE_HDR = false;
+    private static final boolean DEFAULT_ENABLE_PIP = false;
 
     public static final int FORCE_H265_ON = -1;
     public static final int AUTOSELECT_H265 = 0;
@@ -69,6 +71,7 @@ public class PreferenceConfiguration {
     public boolean batterySaver;
     public boolean disableFrameDrop;
     public boolean enableHdr;
+    public boolean enablePip;
 
     public static int getDefaultBitrate(String resFpsString) {
         if (resFpsString.equals("720p30")) {
@@ -213,6 +216,7 @@ public class PreferenceConfiguration {
         config.batterySaver = prefs.getBoolean(BATTERY_SAVER_PREF_STRING, DEFAULT_BATTERY_SAVER);
         config.disableFrameDrop = prefs.getBoolean(DISABLE_FRAME_DROP_PREF_STRING, DEFAULT_DISABLE_FRAME_DROP);
         config.enableHdr = prefs.getBoolean(ENABLE_HDR_PREF_STRING, DEFAULT_ENABLE_HDR);
+        config.enablePip = prefs.getBoolean(ENABLE_PIP_PREF_STRING, DEFAULT_ENABLE_PIP);
 
         return config;
     }

app/src/main/java/com/limelight/preferences/StreamSettings.java

@@ -68,6 +68,13 @@ public class StreamSettings extends Activity {
                 screen.removePreference(category);
             }
 
+            // Remove PiP mode on devices pre-Oreo
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
+                PreferenceCategory category =
+                        (PreferenceCategory) findPreference("category_basic_settings");
+                category.removePreference(findPreference("checkbox_enable_pip"));
+            }
+
             // Remove HDR preference for devices below Nougat
             if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
                 LimeLog.info("Excluding HDR toggle based on OS");

app/src/main/res/values/strings.xml

@@ -110,6 +110,8 @@
     <string name="summary_checkbox_disable_warnings">Disable on-screen connection warning messages while streaming</string>
     <string name="title_checkbox_battery_saver">Battery saver</string>
     <string name="summary_checkbox_battery_saver">Uses less battery, but may increase stuttering</string>
+    <string name="title_checkbox_enable_pip">Enable Picture-in-Picture observer mode</string>
+    <string name="summary_checkbox_enable_pip">Allows the stream to be viewed (but not controlled) while multitasking</string>
 
     <string name="category_audio_settings">Audio Settings</string>
     <string name="title_checkbox_51_surround">Enable 5.1 surround sound</string>

app/src/main/res/xml/preferences.xml

@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
 
-    <PreferenceCategory android:title="@string/category_basic_settings">
+    <PreferenceCategory android:title="@string/category_basic_settings"
+        android:key="category_basic_settings">
         <ListPreference
             android:key="list_resolution_fps"
             android:title="@string/title_resolution_list"
@@ -25,6 +26,11 @@
             android:title="@string/title_checkbox_battery_saver"
             android:summary="@string/summary_checkbox_battery_saver"
             android:defaultValue="false" />
+        <CheckBoxPreference
+            android:key="checkbox_enable_pip"
+            android:title="@string/title_checkbox_enable_pip"
+            android:summary="@string/summary_checkbox_enable_pip"
+            android:defaultValue="false" />
     </PreferenceCategory>
     <PreferenceCategory android:title="@string/category_audio_settings">
         <CheckBoxPreference