Merge "Camera: Improve error handling of device state listeners" into udc-dev

core/java/android/hardware/camera2/CameraCharacteristics.java

@@ -212,14 +212,7 @@ public final class CameraCharacteristics extends CameraMetadata<CameraCharacteri
     @GuardedBy("mLock")
     private boolean mFoldedDeviceState;
 
-    private final CameraManager.DeviceStateListener mFoldStateListener =
+    private CameraManager.DeviceStateListener mFoldStateListener;
-            new CameraManager.DeviceStateListener() {
-                @Override
-                public final void onDeviceStateChanged(boolean folded) {
-                    synchronized (mLock) {
-                        mFoldedDeviceState = folded;
-                    }
-                }};
 
     private static final String TAG = "CameraCharacteristics";
 
@@ -245,7 +238,18 @@ public final class CameraCharacteristics extends CameraMetadata<CameraCharacteri
     /**
      * Return the device state listener for this Camera characteristics instance
      */
-    CameraManager.DeviceStateListener getDeviceStateListener() { return mFoldStateListener; }
+    CameraManager.DeviceStateListener getDeviceStateListener() {
+        if (mFoldStateListener == null) {
+            mFoldStateListener = new CameraManager.DeviceStateListener() {
+                        @Override
+                        public final void onDeviceStateChanged(boolean folded) {
+                            synchronized (mLock) {
+                                mFoldedDeviceState = folded;
+                            }
+                        }};
+        }
+        return mFoldStateListener;
+    }
 
     /**
      * Overrides the property value

core/java/android/hardware/camera2/CameraManager.java

@@ -1836,6 +1836,7 @@ public final class CameraManager {
                         ctx.getSystemService(DeviceStateManager.class).registerCallback(
                                 new HandlerExecutor(mDeviceStateHandler), mFoldStateListener);
                     } catch (IllegalStateException e) {
+                        mFoldStateListener = null;
                         Log.v(TAG, "Failed to register device state listener!");
                         Log.v(TAG, "Device state dependent characteristics updates will not be" +
                                 "functional!");