Android Camera2 判断是否支持 Zoom

判断是否支持Digital Zoom

float max_zoom = characteristics.get(CameraCharacteristics.SCALER_AVAILABLE_MAX_DIGITAL_ZOOM);
camera_features.is_zoom_supported = max_zoom > 0.0f;

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R){
   Range zoomRationRange = characteristics.get((CameraCharacteristics.CONTROL_ZOOM_RATIO_RANGE));
   Log.e(TAG, "cameraId: "+cameraIds+" maxDigitalZoom = " + maxDigitalZoom + " zoomRationRange = "+zoomRationRange);
}

只要 max_zoom > 0.0f 就说明支持 Digital Zoom，另外，如果你的手机系统是 Android R，还可以获取 zoomRationRange 信息。