我们知道自定义Camera需要以下几步
1、打开相机
public static Camera openFacingBackCamera() { Camera cam = null; Camera.CameraInfo cameraInfo = new Camera.CameraInfo(); for (int camIdx = 0, cameraCount = Camera.getNumberOfCameras(); camIdx < cameraCount; camIdx++) { Camera.getCameraInfo(camIdx, cameraInfo); if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) { try { //打开相应的摄像头,目前是前置摄像头 cam = Camera.open(camIdx); } catch (RuntimeException e) { e.printStackTrace(); if (cam!=null){ cam.stopPreview(); cam.release(); } cam = null; } } } return cam; }
2、设置相关参数和预览
//定义SurfaceView private SurfaceView localSurface; // 为surfaceHolder添加一个回调监听器 localSurface.getHolder().addCallback(new SurfaceHolder.Callback() { @Override public void surfaceCreated(SurfaceHolder holder) { } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { camera = CameraUtil.openFacingBackCamera(); //设置相机预览旋转角度 camera.setDisplayOrientation(180); if (camera != null) { Camera.Parameters parameters = camera.getParameters();// 获得相机参数 List<Camera.Size> sizes = parameters.getSupportedPreviewSizes(); List<Camera.Size> sizes_pic = parameters.getSupportedPictureSizes(); Camera.Size cs = sizes.get(0); int mWidth = cs.width; int mHeight = cs.height; parameters.setPreviewSize(mWidth, mHeight); parameters.setPictureSize(sizes_pic.get(0).width, sizes_pic.get(0).height); parameters.setJpegQuality(85);// parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO); parameters.setPictureFormat(ImageFormat.JPEG); camera.setParameters(parameters); try { camera.setPreviewDisplay(localSurface.getHolder()); camera.startPreview(); // 开始预览 camera.autoFocus(null); // 自动对焦 } catch (IOException e) { e.printStackTrace(); camera.stopPreview(); camera.release(); camera = null; } } } @Override public void surfaceDestroyed(SurfaceHolder holder) { if (camera!=null){ camera.stopPreview(); camera.release(); camera = null; } } } ); // 设置该SurfaceView自己不维护缓冲 localSurface.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
3、获取图片
private void getViewImage() { //设置监听 camera.setPreviewCallback(new Camera.PreviewCallback(){ @Override public void onPreviewFrame(byte[] data, Camera camera) { Camera.Size size = camera.getParameters().getPreviewSize(); try{ YuvImage image = new YuvImage(data, ImageFormat.NV21, size.width, size.height, null); if(image!=null){ ByteArrayOutputStream stream = new ByteArrayOutputStream(); image.compressToJpeg(new Rect(0, 0, size.width, size.height), 80, stream); Bitmap bmp = BitmapFactory.decodeByteArray(stream.toByteArray(), 0, stream.size()); //因为图片会放生旋转,因此要对图片进行旋转到和手机在一个方向上 rotateBitmap(bmp); stream.close(); } }catch(Exception ex){ Log.e("Sys","Error:"+ex.getMessage()); } } }); }
旋转图片的方法
public void rotateMyBitmap(Bitmap bmp){ Matrix matrix = new Matrix(); matrix.postScale(-1, 1); // 镜像水平翻转(如果左右颠倒) matrix.postRotate(180); Bitmap nbmp = Bitmap.createBitmap(bmp, 0,0, bmp.getWidth(), bmp.getHeight(), matrix, true); imageView.setImageBitmap(nbmp); };
自定义时间拍照
private Handler mHandler = new Handler() { public void handleMessage(Message msg) { switch (msg.what) { case 101: getViewImage(); Log.e(TAG, "handleMessage: 拍照" ); mHandler.sendEmptyMessageDelayed(102, 100); break; case 102: camera.setPreviewCallback(null); break ; } } };
然后点击按钮调用
mHandler.sendEmptyMessageDelayed(101, 100);
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持呐喊教程。
声明:本文内容来源于网络,版权归原作者所有,内容由互联网用户自发贡献自行上传,本网站不拥有所有权,未作人工编辑处理,也不承担相关法律责任。如果您发现有涉嫌版权的内容,欢迎发送邮件至:notice#nhooo.com(发邮件时,请将#更换为@)进行举报,并提供相关证据,一经查实,本站将立刻删除涉嫌侵权内容。