Android系统自带的camera默认使用后置摄像头

 a/packages/apps/Camera/src/com/android/camera/CameraSettings.java
+++ b/packages/apps/Camera/src/com/android/camera/CameraSettings.java
@@ -420,7 +420,7 @@ public class CameraSettings {
     }
 
     public static int readPreferredCameraId(SharedPreferences pref) {
-        return Integer.parseInt(pref.getString(KEY_CAMERA_ID, "0"));
+        return Integer.parseInt(pref.getString(KEY_CAMERA_ID, "1"));
     }

--- a/packages/apps/Camera/res/values/strings.xml
+++ b/packages/apps/Camera/res/values/strings.xml
@@ -61,7 +61,7 @@
     <!-- Settings screen, camera selection dialog title. Users can select a camera from the phone (front-
     <string name="pref_camera_id_title">Choose camera</string>
 
-    <string name="pref_camera_id_default" translatable="false">0</string>
+    <string name="pref_camera_id_default" translatable="false">1</string>
 
     <!-- In select camera setting, back facing camera. [CHAR LIMIT=14] -->
     <string name="pref_camera_id_entry_back">Back</string>