set Camera Zoom - Android Camera

Android examples for Camera:Camera Zoom

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  2. Android
  3. Camera
  4. Camera Zoom

Description

set Camera Zoom

Demo Code

import java.util.List;

import android.hardware.Camera;

public class Main {
  public static final String TAG = "";

  public static void setZoom(Camera.Parameters parameters, double targetZoomRatio) {
    if (parameters.isZoomSupported()) {
      Integer zoom = indexOfClosestZoom(parameters, targetZoomRatio);
      if (zoom == null) {
        return;/*from www.ja va  2s  .  co  m*/
      }
      if (parameters.getZoom() == zoom) {
      } else {
        parameters.setZoom(zoom);
      }
    }
  }

  private static Integer indexOfClosestZoom(Camera.Parameters parameters, double targetZoomRatio) {
    List<Integer> ratios = parameters.getZoomRatios();
    int maxZoom = parameters.getMaxZoom();
    if (ratios == null || ratios.isEmpty() || ratios.size() != maxZoom + 1) {
      return null;
    }
    double target100 = 100.0 * targetZoomRatio;
    double smallestDiff = Double.POSITIVE_INFINITY;
    int closestIndex = 0;
    for (int i = 0; i < ratios.size(); i++) {
      double diff = Math.abs(ratios.get(i) - target100);
      if (diff < smallestDiff) {
        smallestDiff = diff;
        closestIndex = i;
      }
    }
    return closestIndex;
  }
}

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