Android : Use camera but dont want to take photo

I want to use camera in my app but dont want to take photo, actually I am making a app i.e transparent screen, in this I want to show transparent wallpaper i.e I have to start camera for this and i dont want to take images for this

I tried all these codes but have n't got the desirable results. Can anyone suggest what must i do? used this permission in all cases

<uses-permission android:name="android.permission.CAMERA"/>



 Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivity(intent);

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Intent intent = new Intent(Intent.ACTION_CAMERA_BUTTON, null);
startActivity(intent);

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    Intent intent = new Intent(android.provider.MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA);
    startActivity(intent);