项目中经常用到Android自带的camera拍照功能。于是做了个封装，CameraUtil.java类。
再次用到就简单啦，可以最大限度的复用提高效率。
我最喜欢对常用的功能模块进行封装，因为优秀的代码思想就是要追求最大化的复用和高效率。推荐《重构》和《程序员修炼之道》书籍。不要觉得这类书籍有些理论比较空洞，不如看某某实战之类的书籍。其实这类书籍影响的是人的思想，思想改变远比你多学几行代码重要。
好的封装，能使你做事事半功倍，像搭积木一样快速的实现应用。为啥有的大牛做东西很快？原因无他，肯定是沉淀积累了很多可以复用的轮子。
封装后的CameraUtil类使用很简单。
先来张效果图：
封装后的CameraUtil类使用有多简单？
if (cameraUtil == null){ int rotation = getWindowManager().getDefaultDisplay().getRotation(); cameraUtil = new CameraUtil(surfaceView, 0,rotation, takeButton, onPictureListener); cameraUtil.start(); }
只需传进去五个参数即可。第一个就是预览的界面surfaceView,第二个参数相机ID,默认为０.第三个参数图像旋转的角度。第四个参数拍照的按钮。onPictureListener为拍完照片的回调处理。
/* * 拍照信息回调 */ OnPictureListener onPictureListener = new OnPictureListener() { @Override public void getPicture(Drawable drawable) { //getCameraPicture(drawable); final Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap(); Log.d(TAG,"take picture bitmap size kb:"+bitmap.getByteCount()/1024); DataConstant.photo = Utils.bitmapToString(bitmap); File tempFile = new File("/sdcard/temp0.png"); try { FileOutputStream fos = new FileOutputStream(tempFile); bitmap.compress(Bitmap.CompressFormat.PNG,100,fos); //写入，这里会卡顿，因为图片较大 fos.flush(); //记得要关闭写入流 fos.close(); }catch (Exception ex){ ex.printStackTrace(); } }
封装如下：
package com.newcapec.fkrobot.util; import android.content.Context; import android.graphics.Bitmap; import android.graphics.ImageFormat; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.hardware.Camera; import android.media.AudioManager; import android.media.MediaPlayer; import android.net.Uri; import android.os.Build; import android.os.Environment; import android.util.Log; import android.view.Surface; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import com.newcapec.fkrobot.app.App; import com.newcapec.fkrobot.interf.OnPictureListener; import java.io.ByteArrayInputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.lang.reflect.Method; import java.util.List; /** * @author : yangyognzhen * @date :2020/7/11 14:19 * @description: **/ public class CameraUtil { private String TAG = this.getClass().getSimpleName(); //相机和相机预览mSurfaceView private Camera mCamera; private SurfaceView mSurfaceView; private SurfaceHolder mHolder; //摄像头支持的分辨率 private Camera.Size mPreviewSize; private List mSupportedPreviewSizes; //private Activity activity; private View button; private int mCameraId; private int additionalRotation; private int displayOrientation = 0; private int rotation; private OnPictureListener onFinishListener; private static CameraUtil _instance; public static CameraUtil getInstance(SurfaceView surfaceView, int cameraId, int rotation, View button, OnPictureListener onFinishListener) { if (_instance == null) _instance = new CameraUtil(surfaceView,cameraId,rotation,button,onFinishListener); return _instance; } public CameraUtil(SurfaceView surfaceView, int cameraId, int rotation, View button, OnPictureListener onFinishListener){ this.mSurfaceView = surfaceView; this.button = button; this.onFinishListener = onFinishListener; mCameraId = cameraId; this.rotation = rotation; //初始化相机预览及回调 initData(cameraId); } private void initData(int id) { //增加surfaceview回调 mHolder= mSurfaceView.getHolder(); mHolder.addCallback(callback); //mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); mPreviewSize=getPreviewSize(id); // mCamera.setDisplayOrientation(270); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Camera.Parameters parameters = mCamera.getParameters(); parameters.setJpegQuality(100); //生成图像的质量 mCamera.setParameters(parameters); parameters.setPictureFormat(ImageFormat.JPEG); parameters.setPictureSize(640, 480); //生成图像的风辨率 mCamera.setParameters(parameters); // int ro = displayOrientation+90; // if(ro >= 360){ // ro = 0; // } parameters.setRotation(displayOrientation); //生成的图像旋转90度 mCamera.setParameters(parameters); //拍照的提示音 shootSound(); mCamera.takePicture(null,null, new Camera.PictureCallback() { @Override public void onPictureTaken(byte[] data, Camera camera) { // 主要就是将图片转化成drawable，设置为固定区域的背景（展示图片），当然也可以直接在布局文件里放一个surfaceView供使用。 ByteArrayInputStream bais = new ByteArrayInputStream(data); Drawable d = BitmapDrawable.createFromStream(bais, Environment .getExternalStorageDirectory().getAbsolutePath() + "/img.jpeg"); Bitmap bitmap = ((BitmapDrawable) d).getBitmap(); Log.d(TAG,"fk picture bitmap size kb:"+bitmap.getByteCount()/1024); File tempFile = new File("/sdcard/temp.png"); try { FileOutputStream fos = new FileOutputStream(tempFile); fos.write(data); fos.close(); }catch (Exception ex){ ex.printStackTrace(); } if(onFinishListener != null){ onFinishListener.getPicture(d); } mCamera.startPreview(); try { } catch (Exception e) { e.printStackTrace(); } } }); } }); } private Camera.Size getPreviewSize(int id){ mCamera = Camera.open(id); // mCamera.setDisplayOrientation(270); displayOrientation = getCameraOri(rotation); Log.e(TAG,"camera displayOrientation:"+displayOrientation); mCamera.setDisplayOrientation(displayOrientation); setCamera(mCamera); if(mCamera!=null){ Camera.Parameters parameters = mCamera.getParameters(); //获取摄像头支持的分辨率 List<Camera.Size> sizes = parameters.getSupportedPreviewSizes(); //遍历输出摄像头支持的所有分辨率 for(Camera.Size s: sizes){ Log.e(TAG,"size====="+s.width+"X"+s.height); } Camera.Size optimalSize = Utils.getOptimalPreviewSize(sizes, sizes.get(0).height, sizes.get(0).width); return optimalSize; } return null; } private void setCamera(Camera camera) { mCamera = camera; if (mCamera != null) { mSupportedPreviewSizes = mCamera.getParameters().getSupportedPreviewSizes(); } try { camera.setPreviewDisplay(mHolder); } catch (IOException exception) { Log.e(TAG, "IOException caused by setPreviewDisplay()", exception); } Camera.Parameters parameters = camera.getParameters(); // 设置相片格式 parameters.setJpegQuality(100); //生成图像的质量 mCamera.setParameters(parameters); parameters.setPictureFormat(ImageFormat.JPEG); //parameters.setPreviewFormat(ImageFormat.YV12); //parameters.setPictureFormat(ImageFormat.FLEX_RGB_888); // 设置预览大小 //parameters.setPreviewSize(640, 480); parameters.setPictureSize(640, 480); //生成图像的风辨率 mCamera.setParameters(parameters); //List sizes = parameters.getSupportedPreviewSizes(); //Camera.Size optimalSize = Utils.getOptimalPreviewSize(sizes, 1920, 1080); //parameters.setPreviewSize(optimalSize.width, optimalSize.height); //设置摄像头翻转角度 //parameters.setRotation(90); //设置镜像效果，支持的值为flip-mode-values=off,flip-v,flip-h,flip-vh; //flip-mode-values规定了翻转（镜像）模式的取值只能为off（关闭）,flip-v（竖直翻转）,flip-h（水平翻转）,flip-vh（竖直+水平翻转） //parameters.set("preview-flip", "flip-vh"); camera.setParameters(parameters); } SurfaceHolder.Callback callback = new SurfaceHolder.Callback() { @Override public void surfaceCreated(SurfaceHolder holder) { try { if (mCamera != null) { //建立预览界面 mCamera.setPreviewDisplay(holder); //mCamera.setDisplayOrientation(270); } } catch (IOException exception) { Log.e(TAG, "IOException caused by setPreviewDisplay()", exception); } } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { if(mCamera != null){ Camera.Parameters parameters = mCamera.getParameters(); parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height); parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);// 1连续对焦 setDispaly(parameters, mCamera); //开始预览 mCamera.startPreview(); } } @Override public void surfaceDestroyed(SurfaceHolder holder) { if (mCamera != null) { mCamera.stopPreview(); } } }; /* * 控制图像的正确显示方向 */ private void setDispaly(Camera.Parameters parameters, Camera camera) { if (Integer.parseInt(Build.VERSION.SDK) >= 8) { // setDisplayOrientation(camera, 0); } else { // parameters.setRotation(90); } } private int getCameraOri(int rotation) { int degrees = rotation * 90; 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; default: break; } additionalRotation /= 90; additionalRotation *= 90; degrees += additionalRotation; int result; Camera.CameraInfo info = new Camera.CameraInfo(); Camera.getCameraInfo(mCameraId, info); if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) { result = (info.orientation + degrees) % 360; result = (360 - result) % 360; } else { result = (info.orientation - degrees + 360) % 360; } return result; } /* * 实现的图像的正确显示 */ private void setDisplayOrientation(Camera camera, int i) { Method downPolymorphic; try { downPolymorphic = camera.getClass().getMethod("setDisplayOrientation", new Class[]{int.class}); if (downPolymorphic != null) { downPolymorphic.invoke(camera, new Object[]{i}); } } catch (Exception e) { Log.e("Came_e", "图像出错"); } } /** * 播放系统拍照声音 */ public void shootSound() { MediaPlayer shootMP; AudioManager meng = (AudioManager) App.getContext().getSystemService(Context.AUDIO_SERVICE); int volume = meng.getStreamVolume( AudioManager.STREAM_NOTIFICATION); if (volume != 0) { shootMP = MediaPlayer.create(App.getContext(), Uri.parse("file:///system/media/audio/ui/camera_click.ogg")); shootMP.start(); } } /** * 开启拍照 */ public void start() { synchronized (this) { if (mCamera != null) { return; } //initData(0); mCamera.startPreview(); } } /** * 停掉摄像头拍照 */ public void stop() { synchronized (this) { if (mCamera == null) { return; } mCamera.stopPreview(); mCamera.release(); mCamera = null; Log.e(TAG,"释放摄像头"); } } }
