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If you don't need to run on Android releases before 3.0 (Honeycomb), you can use the SurfaceTexture output option, and OpenGL ES for rendering multiple previews. Setting up a working OpenGL view is a bit involved, so you'll want to find a guide for that. Once you have that working, create a <a href="http://developer.android.com/reference/android/graphics/SurfaceTexture.html" rel="nofollow">SurfaceTexture</a> object with a OpenGL texture ID you want to use for the preview texture, pass that into the camera with <a href="http://developer.android.com/reference/android/hardware/Camera.html#setPreviewTexture%28android.graphics.SurfaceTexture%29" rel="nofollow">setPreviewTexture</a> instead of using setPreviewDisplay, and then in your OpenGL thread, call <a href="http://developer.android.com/reference/android/graphics/SurfaceTexture.html#updateTexImage%28%29" rel="nofollow">updateTexImage</a> to update the texture to show the latest frame from the camera (best to do so in response to a <a href="http://developer.android.com/reference/android/graphics/SurfaceTexture.OnFrameAvailableListener.html#onFrameAvailable%28android.graphics.SurfaceTexture%29" rel="nofollow">onFrameAvailable</a> callback for best performance). Then you need OpenGL code to render two rectangles for your two copies of preview, and a shader to draw the preview texture on both. This is a decent bit of setup, but in the end, you'll have a very flexible system - then you can animate the preview in various fun ways, etc. 
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1. POHow to show two identical camera previews with the Android camera?
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1. USEddy Talvala
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1. POHow to show two identical camera previews with the Android camera?
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1. COI am currently using onPreviewFrame to also send some the data to send the data to some third party native code. Is it possible to use your suggested method and still receive the data in onPreviewFrame?
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