This article shows the steps to load an image into Android Emulator Camera. This is useful when you need to test QR code scanning, and you don't have a physical device.
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When you open the camera on an Android Emulator, you normally see a living room with a TV.

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You can select an image under the camera menu from the emulator setting.

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Then, in the Android Emulator, the selected image is rendered on the wall. You must navigate from the living room into the dining room to see this image.
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By holding to the SHIFT key, you can use the arrow keys to change your viewing angle and the WASD keys to walk around.
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Turn 180 degrees back from where you see the TV. There is a room on your right.

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Go into the room, and you should see the QR image on the wall.

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Now, your QR scanner should be able to detect a QR code and continue to the next steps.