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

This reverts commit 07b88fefd4.

api/current.xml

@@ -73399,6 +73399,16 @@
  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

@@ -211,7 +211,8 @@ public class Camera {
      * blocking the main application UI thread.
      *
      * @param cameraId the hardware camera to access, between 0 and
-     *     {@link #getNumberOfCameras()}-1.
+     *     {@link #getNumberOfCameras()}-1.  Use {@link #CAMERA_ID_DEFAULT}
+     *     to access the default camera.
      * @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).
@@ -221,21 +222,18 @@ public class 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.
+     * 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.
      * @see #open(int)
      */
     public static Camera open() {
-        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;
+        return new Camera(CAMERA_ID_DEFAULT);
     }
 
     Camera(int cameraId) {