f7a13682
 “wangming”
项目初始化
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package etelligens.com.foodsafety.utils;
import android.app.Activity;
import android.content.Context;
import android.hardware.Camera;
import android.util.Log;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import java.io.IOException;
/**
* Created by kinjal.dhamat on 4/6/2017.
*/
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder surfaceHolder;
private Context context;
private android.hardware.Camera camera;
private int cameraType;
public CameraPreview(Context context, android.hardware.Camera camera, int cameraType) {
super(context);
this.context = context;
this.camera = camera;
this.cameraType = cameraType;
surfaceHolder = getHolder();
// surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
surfaceHolder.addCallback(this);
}
public static void setCameraDisplayOrientation(Activity activity,
int cameraId, android.hardware.Camera camera) {
android.hardware.Camera.CameraInfo info =
new android.hardware.Camera.CameraInfo();
android.hardware.Camera.getCameraInfo(cameraId, info);
int rotation = activity.getWindowManager().getDefaultDisplay()
.getRotation();
int degrees = 0;
switch (rotation) {
case Surface.ROTATION_0:
degrees = 0;
break;
case Surface.ROTATION_90:
degrees = 90;
break;
case Surface.ROTATION_180:
degrees = 180;
break;
case Surface.ROTATION_270:
degrees = 270;
break;
}
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;
}
camera.setDisplayOrientation(result);
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
try {
if (camera != null) {
camera.setPreviewDisplay(holder);
setCameraDisplayOrientation((Activity) context, cameraType, camera);
camera.startPreview();
}
} catch (IOException e) {
Log.d("tag", "Error setting camera preview: " + e.getMessage());
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
if (holder == null) {
return;
}
try {
camera.stopPreview();
} catch (Exception e) {
Log.d("tag", "Error setting camera stop: " + e.getMessage());
}
try {
if (camera != null) {
camera.setPreviewDisplay(holder);
// camera.setDisplayOrientation(90);
setCameraDisplayOrientation((Activity) context, cameraType, camera);
camera.startPreview();
}
} catch (IOException e) {
Log.d("tag", "Error setting camera preview: " + e.getMessage());
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
if (camera != null)
camera.release();
}
}
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