Android: improve check to know if running on ChromeBook or emulator.

https://stackoverflow.com/questions/39784415/how-to-detect-programmatically-if-android-app-is-running-in-chrome-book-or-in

android-project/app/src/main/java/org/libsdl/app/HIDDeviceBLESteamController.java

@@ -161,7 +161,7 @@ class HIDDeviceBLESteamController extends BluetoothGattCallback implements HIDDe
         mDevice = device;
         mDeviceId = mManager.getDeviceIDForIdentifier(getIdentifier());
         mIsRegistered = false;
-        mIsChromebook = mManager.getContext().getPackageManager().hasSystemFeature("org.chromium.arc.device_management");
+        mIsChromebook = SDLActivity.isChromebook();
         mOperations = new LinkedList<GattOperation>();
         mHandler = new Handler(Looper.getMainLooper());
 

android-project/app/src/main/java/org/libsdl/app/HIDDeviceManager.java

@@ -108,7 +108,7 @@ public class HIDDeviceManager {
         HIDDeviceRegisterCallback();
 
         mSharedPreferences = mContext.getSharedPreferences("hidapi", Context.MODE_PRIVATE);
-        mIsChromebook = mContext.getPackageManager().hasSystemFeature("org.chromium.arc.device_management");
+        mIsChromebook = SDLActivity.isChromebook();
 
 //        if (shouldClear) {
 //            SharedPreferences.Editor spedit = mSharedPreferences.edit();

android-project/app/src/main/java/org/libsdl/app/SDLActivity.java

@@ -1331,10 +1331,17 @@ public class SDLActivity extends Activity implements View.OnSystemUiVisibilityCh
      * This method is called by SDL using JNI.
      */
     public static boolean isChromebook() {
-        if (getContext() == null) {
-            return false;
+        // https://stackoverflow.com/questions/39784415/how-to-detect-programmatically-if-android-app-is-running-in-chrome-book-or-in
+        if (getContext() != null) {
+            if (getContext().getPackageManager().hasSystemFeature("org.chromium.arc")
+                || getContext().getPackageManager().hasSystemFeature("org.chromium.arc.device_management")) {
+                return true;
+            }
         }
-        return getContext().getPackageManager().hasSystemFeature("org.chromium.arc.device_management");
+
+        // Running on AVD emulator
+        boolean isChromebookEmulator = (Build.MODEL != null && Build.MODEL.startsWith("sdk_gpc_"));
+        return isChromebookEmulator;
     }
 
     /**
@@ -2117,7 +2124,7 @@ public class SDLActivity extends Activity implements View.OnSystemUiVisibilityCh
         int requestCode;
         boolean multipleChoice;
     }
-    
+
     /**
      * This method is called by SDL using JNI.
      */