android.hardware.Camera.open only returns back-facing camera.

bug:3173302
Change-Id: I813e41b36c776246f151b66ef289cdf13a05dc2c

api/current.xml

@@ -73399,16 +73399,6 @@
  visibility="public"
 >
 </field>
-<field name="CAMERA_ID_DEFAULT"
- type="int"
- transient="false"
- volatile="false"
- static="true"
- final="false"
- deprecated="not deprecated"
- visibility="public"
->
-</field>
 </class>
 <interface name="Camera.AutoFocusCallback"
  abstract="true"

core/java/android/hardware/Camera.java

@@ -211,8 +211,7 @@ public class Camera {
      * blocking the main application UI thread.
      *
      * @param cameraId the hardware camera to access, between 0 and
-     *     {@link #getNumberOfCameras()}-1.  Use {@link #CAMERA_ID_DEFAULT}
-     *     to access the default camera.
+     *     {@link #getNumberOfCameras()}-1.
      * @return a new Camera object, connected, locked and ready for use.
      * @throws RuntimeException if connection to the camera service fails (for
      *     example, if the camera is in use by another process).
@@ -222,18 +221,21 @@ public class Camera {
     }
 
     /**
-     * The id for the default camera.
-     * @see #open(int)
-     */
-    public static int CAMERA_ID_DEFAULT = 0;
-
-    /**
-     * Equivalent to Camera.open(Camera.CAMERA_ID_DEFAULT).
-     * Creates a new Camera object to access the default camera.
+     * Creates a new Camera object to access the first back-facing camera on the
+     * device. If the device does not have a back-facing camera, this returns
+     * null.
      * @see #open(int)
      */
     public static Camera open() {
-        return new Camera(CAMERA_ID_DEFAULT);
+        int numberOfCameras = getNumberOfCameras();
+        CameraInfo cameraInfo = new CameraInfo();
+        for (int i = 0; i < numberOfCameras; i++) {
+            getCameraInfo(i, cameraInfo);
+            if (cameraInfo.facing == CameraInfo.CAMERA_FACING_BACK) {
+                return new Camera(i);
+            }
+        }
+        return null;
     }
 
     Camera(int cameraId) {