Util.java
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package com.huaheng.wms.facedete;
import android.app.Activity;
import android.graphics.Point;
import android.hardware.Camera;
import android.os.Build;
import android.util.Log;
import android.view.Display;
import android.view.Surface;
import java.util.List;
/**
* 作者：created by meixi
* 邮箱：13164716840@163.com
* 日期：2018/8/29 15
*/
public class Util {
// Orientation hysteresis amount used in rounding, in degrees
private static final int ORIENTATION_HYSTERESIS = 5;
private static final String TAG = "Util";
/**
* Gets the current display rotation in angles.
*
* @param activity
* @return
*/
public static int getDisplayRotation(Activity activity) {
int rotation = activity.getWindowManager().getDefaultDisplay()
.getRotation();
switch (rotation) {
case Surface.ROTATION_0:
return 0;
case Surface.ROTATION_90:
return 90;
case Surface.ROTATION_180:
return 180;
case Surface.ROTATION_270:
return 270;
}
return 0;
}
public static int getDisplayOrientation(int degrees, int cameraId) {
// See android.hardware.Camera.setDisplayOrientation for
// documentation.
Camera.CameraInfo info = new Camera.CameraInfo();
Camera.getCameraInfo(cameraId, info);
int result;
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
result = (info.orientation + degrees) % 360;
result = (360 - result) % 360; // compensate the mirror
} else { // back-facing
result = (info.orientation - degrees + 360) % 360;
}
return result;
}
public static Camera.Size getOptimalPreviewSize(Activity currentActivity,
List<Camera.Size> sizes, double targetRatio) {
// Use a very small tolerance because we want an exact match.
final double ASPECT_TOLERANCE = 0.001;
if (sizes == null) return null;
Camera.Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
// Because of bugs of overlay and layout, we sometimes will try to
// layout the viewfinder in the portrait orientation and thus get the
// wrong size of preview surface. When we change the preview size, the
// new overlay will be created before the old one closed, which causes
// an exception. For now, just get the screen size.
Point point = getDefaultDisplaySize(currentActivity, new Point());
int targetHeight = Math.min(point.x, point.y);
// Try to find an size match aspect ratio and size
for (Camera.Size size : sizes) {
double ratio = (double) size.width / size.height;
if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
// Cannot find the one match the aspect ratio. This should not happen.
// Ignore the requirement.
if (optimalSize == null) {
Log.w(TAG, "No preview size match the aspect ratio");
minDiff = Double.MAX_VALUE;
for (Camera.Size size : sizes) {
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
}
return optimalSize;
}
@SuppressWarnings("deprecation")
private static Point getDefaultDisplaySize(Activity activity, Point size) {
Display d = activity.getWindowManager().getDefaultDisplay();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
d.getSize(size);
} else {
size.set(d.getWidth(), d.getHeight());
}
return size;
}
}