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I tried to use my device front camera with this code :

<org.opencv.android.JavaCameraView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:visibility="gone"
        android:id="@+id/tutorial1_activity_java_surface_view"
        opencv:show_fps="true"
        opencv:camera_id="front" />

It worked but the preview is upside down! How to fix it? I use OpenCV 2.4.5.
Here is my user interface file :

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:opencv="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:orientation="horizontal"
    android:layout_height="match_parent" >

    <org.opencv.android.JavaCameraView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:visibility="gone"
        android:id="@+id/tutorial1_activity_java_surface_view"
        opencv:show_fps="true"
        opencv:camera_id="front" />

    <org.opencv.android.NativeCameraView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:visibility="gone"
        android:id="@+id/tutorial1_activity_native_surface_view"
        opencv:show_fps="true"
        opencv:camera_id="front" />

</LinearLayout>

Both of native camera and java camera have this problem.