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You skip OpenCV properties inclusion string: xmlns:opencv="http://schemas.android.com/apk/res-auto" in your root xml tag (LinearLayout). See tutorial-1 layout.xml file from OpenCV4Android SDK 2.4.4 as an example.

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You skip missed the OpenCV properties inclusion string: xmlns:opencv="http://schemas.android.com/apk/res-auto" xmlns:opencv="http://schemas.android.com/apk/res-auto" in your root xml tag (LinearLayout). (LinearLayout). See tutorial-1 layout.xml tutorial-1 layout.xml file from OpenCV4Android SDK 2.4.4 as an example.